阅读说明：本技术 音频系统及其控制方法、装置 (Audio system and control method and device thereof ) 是由 郝选 于 2021-09-07 设计创作，主要内容包括：本发明公开一种音频系统其控制方法、装置,该音频系统包括：指向性扬声器组,包括多个指向性扬声器,多个指向性扬声器分设于对应的第一预设位置；其中,多个指向性扬声器在工作时,分别定向第二预设位置辐射声波,以在预设传音区域内形成三维区域声场,第一预设位置和第二预设位置位于预设传音区域内。本发明实现了音频信号独立分区播放功能,有利于提高用户音频播放的私密性,同时可以满足处于同一空间内,不同用户对音频信号的需求。(The invention discloses an audio system and a control method and a control device thereof, wherein the audio system comprises: the directional loudspeaker set comprises a plurality of directional loudspeakers, and the plurality of directional loudspeakers are respectively arranged at corresponding first preset positions; when the plurality of directional loudspeakers work, the directional loudspeakers respectively direct the second preset positions to radiate sound waves so as to form a three-dimensional area sound field in the preset sound transmission area, and the first preset positions and the second preset positions are located in the preset sound transmission area. The invention realizes the function of playing audio signals in independent subareas, is beneficial to improving the privacy of audio playing of users, and can meet the requirements of different users on the audio signals in the same space.)

1. An audio system, characterized in that the audio system comprises:

the directional loudspeaker set comprises a plurality of directional loudspeakers, and the plurality of directional loudspeakers are respectively arranged at corresponding first preset positions; wherein the content of the first and second substances,

when the directional loudspeakers work, the directional loudspeakers respectively direct a second preset position to radiate sound waves so as to form a three-dimensional area sound field in a preset sound transmission area, and the first preset position and the second preset position are located in the preset sound transmission area.

2. The audio system of claim 1, wherein the number of the directional speaker groups is plural, and each of the directional speaker groups is disposed in a predetermined sound transmission area.

3. The audio system of claim 2, wherein the audio system further comprises:

the number of the audio input interfaces corresponds to the number of the directional loudspeaker sets, and each audio input interface is connected with one path of audio signals;

a plurality of audio processors, an input end of each audio processor being connected to one of the audio input interfaces, and a plurality of output ends of each audio processor being connected to a plurality of the directional speakers of one of the directional speaker groups in a one-to-one correspondence; wherein the content of the first and second substances,

each audio processor is used for converting the accessed audio signals into audio signals of a plurality of sound channels and then outputting the audio signals of the sound channels to the corresponding directional loudspeaker.

4. The audio system of claim 3, wherein the audio system further comprises:

the control switches are arranged between the input ends of every two audio processors in series; wherein the content of the first and second substances,

when the control switch is closed, the two audio processors connected with the control switch process the accessed audio signals and output the processed audio signals to the directional loudspeakers corresponding to the two audio processors, so that the audio signals can be synchronously played in the preset sound transmission areas.

5. The audio system of claim 2, wherein the audio processor is further configured to process the audio signals into a plurality of channels of audio signals according to the stored vector positions between the second preset position and the plurality of first preset positions, and output the audio signals of the channels to corresponding directional speakers.

6. The audio system of any of claims 2 to 5, wherein the directional speaker is an ultrasonic transducer.

7. The audio system of claim 6, wherein each of the audio processors comprises:

and the audio modulation circuit is connected with the audio input interface and is used for modulating the accessed audio signal and outputting the modulated audio signal to the corresponding ultrasonic transducer.

8. The control method of an audio system is characterized in that the audio system comprises a plurality of directional loudspeaker groups, and each directional loudspeaker group is arranged in a preset sound transmission area; the control method of the audio system comprises the following steps:

acquiring an audio system control instruction;

and controlling the corresponding directional loudspeaker groups in the plurality of directional loudspeaker groups to work according to the acquired audio system control instruction so as to play audio signals in the corresponding preset sound transmission area.

9. The method of controlling an audio system according to claim 8, further comprising the steps of:

acquiring a user target position in a preset voice transmission area;

and adjusting the angle of the sound outlet of the directional loudspeaker in the corresponding directional loudspeaker group according to the target position of the user.

10. A control device of an audio system, characterized by comprising the audio system according to any one of claims 1 to 7; and the number of the first and second groups,

memory, a processor, the memory having stored thereon a control program of an audio system, the control program of the audio system when executed by the processor implementing the steps of the method of controlling an audio system according to claim 8 or 9.

Technical Field

The invention relates to the technical field of intelligent audio control, in particular to an audio system and a control method and device thereof.

Background

In the large context of intellectualization, vehicles, such as automobiles, have an increasing variety of audio signals, such as music, navigation warning tones, steering warning tones, alarm sounds, and the like. The mixing of multiple sounds within a vehicle for an extended period of time can lead to increased annoyance to occupants within the vehicle, and the desire to have a separate sound environment has increased. For example, a driver may want to listen to music while driving and other passengers may be at rest, where the optimal music playing mode is to make the driver listen to music only, but the other passengers cannot listen to the music or the volume of the music that can be heard is relatively small. However, once the audio system in the car of the current car product on the market is turned on, all the people in the car will sense at the same time, and the demands of different people are different and cannot be satisfied.

Disclosure of Invention

The invention mainly aims to provide an audio system and a control method and device thereof, aiming at realizing the function of playing audio signals in an independent partition mode.

To achieve the above object, the present invention provides an audio system, including:

the directional loudspeaker set comprises a plurality of directional loudspeakers, and the plurality of directional loudspeakers are respectively arranged at corresponding first preset positions; wherein the content of the first and second substances,

when the directional loudspeakers work, the directional loudspeakers respectively direct a second preset position to radiate sound waves so as to form a three-dimensional area sound field in a preset sound transmission area, and the first preset position and the second preset position are located in the preset sound transmission area.

Optionally, the number of the directional speaker groups is plural, and each of the directional speaker groups is disposed in one of the preset sound transmission regions.

Optionally, the audio system further comprises:

the number of the audio input interfaces corresponds to the number of the directional loudspeaker sets, and each audio input interface is connected with one path of audio signals;

a plurality of audio processors, an input end of each audio processor being connected to one of the audio input interfaces, and a plurality of output ends of each audio processor being connected to a plurality of the directional speakers of one of the directional speaker groups in a one-to-one correspondence; wherein the content of the first and second substances,

each audio processor is used for converting the accessed audio signals into audio signals of a plurality of sound channels and then outputting the audio signals of the sound channels to the corresponding directional loudspeaker.

Optionally, the audio system further comprises:

the control switches are arranged between the input ends of every two audio processors in series; wherein the content of the first and second substances,

when the control switch is closed, the two audio processors connected with the control switch process the accessed audio signals and output the processed audio signals to the directional loudspeakers corresponding to the two audio processors, so that the audio signals can be synchronously played in the preset sound transmission areas.

Optionally, the audio processor is further configured to process the audio signal into audio signals of multiple channels according to a stored vector position between the second preset position and the multiple first preset positions, and output the audio signals of the multiple channels to corresponding directional speakers.

Optionally, the directional speaker is an ultrasonic transducer.

Optionally, each of the audio processors comprises:

and the audio modulation circuit is connected with the audio input interface and is used for modulating the accessed audio signal and outputting the modulated audio signal to the corresponding ultrasonic transducer.

The invention also provides a control method of the audio system, wherein the audio system comprises a plurality of directional loudspeaker groups, and each directional loudspeaker group is arranged in a preset sound transmission area; the control method of the audio system comprises the following steps:

acquiring an audio system control instruction;

and controlling the corresponding directional loudspeaker groups in the plurality of directional loudspeaker groups to work according to the acquired audio system control instruction so as to play audio signals in the corresponding preset sound transmission area.

Optionally, the control method of the audio system further includes the steps of:

acquiring a user target position in a preset voice transmission area;

and adjusting the angle of the sound outlet of the directional loudspeaker in the corresponding directional loudspeaker group according to the target position of the user.

The invention also provides a control device of the audio system, which comprises the audio system; and the number of the first and second groups,

the control program of the audio system is stored in the memory, and when the control program of the audio system is executed by the processor, the steps of the control method of the audio system are realized.

The invention also provides a vehicle, which comprises a cavity and the audio system; wherein the content of the first and second substances,

the audio system is disposed on and/or within the cavity.

Optionally, the vehicle further comprises:

the audio system is provided with a plurality of directional loudspeaker sets, and each directional loudspeaker set corresponds to one seat.

Optionally, the vehicle further comprises a control component, the control component being electrically connected to the audio system.

The audio system is provided with the directional loudspeaker groups, each group comprises the directional loudspeakers, the plurality of the directional loudspeakers are respectively arranged at the corresponding first preset positions, and the plurality of the directional loudspeakers are aware of radiating sound waves at the second preset positions respectively when working, so that a three-dimensional area sound field is formed in the preset sound transmission area. According to the practical application requirement, the sound wave can be radiated to the appointed position, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional loudspeaker set, and the audio signal played by the directional loudspeaker set cannot be received at the places except the sound field of other three-dimensional areas, so that the audio signal independent partition playing function is realized. The invention is beneficial to improving the privacy of the audio playing of the user and can meet the requirements of the users in the same space and different positions on the audio signals.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of the three-dimensional zone sound field generated by the audio system of the present invention during operation;

FIG. 2 is a schematic circuit diagram of an audio system according to an embodiment of the present invention;

FIG. 3 is a circuit diagram of an embodiment of the audio processor of FIG. 2;

FIG. 4 is a schematic structural diagram of an audio system of the present invention applied to a vehicle;

FIG. 5 is a frequency response curve for a driver's position and a co-driver's position of a vehicle according to the present invention;

FIG. 6 is a flowchart illustrating an embodiment of a method for controlling an audio system according to the present invention;

fig. 7 is a flowchart illustrating a control method of an audio system according to another embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The invention provides an audio system.

Referring to fig. 1 to 5, in an embodiment of the present invention, the audio system includes:

a directional speaker group 10 including a plurality of directional speakers (10a, 10b, 10c), the plurality of directional speakers (10a, 10b, 10c) being respectively disposed at corresponding first preset positions; wherein the content of the first and second substances,

when the directional loudspeakers (10a, 10b, 10c) (10a, 10b, 10c) work, sound waves are radiated towards second preset positions respectively so as to form a three-dimensional area sound field in a preset sound transmission area, and the first preset positions and the second preset positions are located in the preset sound transmission area.

In this embodiment, the first preset position is an installation position of each directional speaker, and the second preset position is a target position of the directional speaker radiating the audio signal, for example, a preferred position where the user pos1 can perceive the audio signal. The position may be a common status position of the user pos1 in the predetermined sound transmission area when the user pos1 is in the predetermined sound transmission area, such as sitting in the predetermined sound transmission area or lying in the predetermined sound transmission area. The second predetermined location may be a location of the head of the user pos1 within the predetermined sound transmission area, and may be a midpoint between two ears of the listener. When the directional speaker is mounted, the sound outlet of the directional speaker can be directed to the position of the head. The second preset position may be a fixed position or an adjustable position, and when the second preset position is set as the fixed position, each directional speaker is fixed at the first preset position. When the second preset position is an adjustable position, for example, when the user changes from sitting to lying on his back, the head position may shift, and the second preset position may be adjusted by adjusting the installation position of the directional speaker or adjusting the angle of the sound outlet of the directional speaker, so that the sound radiation direction of the directional speaker always follows the user pos 1. In a specific application, the second preset position can be adjusted manually, or the position of the head of the user pos1 can be detected by arranging a camera and a sensor, such as an infrared sensor, and the like, and then the directional loudspeaker is driven to move by a motor and the like.

The number of the directional speakers in one set of the directional speaker set 10 may be two, or three, or four, and may be specifically set according to the application area and the product volume of the audio system, which is not limited herein. Furthermore, the plurality of directional speakers (10a, 10b, 10c) may be arranged at equal intervals or at unequal intervals, and it is only necessary to ensure that the vector positions formed by the sound source propagation directions of the plurality of directional speakers (10a, 10b, 10c) can be directed to the second preset position. When two directional speakers are provided, two directional speakers may be provided on both sides of the second preset position, and a distance between each of the directional speakers provided on the first preset position and the second preset position may be equally spaced. The distance between one of the directional speakers and the two preset positions is equal to the distance between the other of the directional speakers and the two preset positions, and the distance between the two directional speakers is equal to the distance between the other of the directional speakers and the two preset positions. When three directional speakers are provided, the three directional speakers may be provided on both left and right hands for being in a preset sound transmission area, and above the head, respectively. The directional speaker may be implemented using a speaker capable of directionally propagating an audio signal, such as a line array speaker, an ultrasonic speaker, and the like. In the following exemplary embodiments of the present invention, an ultrasonic speaker, in particular, an ultrasonic transducer is taken as an example for explanation. According to the directional propagation of the ultrasonic wave, the following non-odd wave equation is obtained:

in the formulaρ₀Is the fluid density; p is a radical of₁Fundamental wave sound pressure; p is a radical of_sSecondary wave sound pressure; c. C₀Is the speed of sound; beta is a nonlinear parameter of the medium.

The sound pressure that generates a secondary wave after nonlinear interaction can be obtained by solving equation (1):

wherein r is the position vector of the observation point; r is^′Is a sound source position vector; v is the region of nonlinear action. As can be seen from equations (1) and (2), after the ultrasonic signal modulated by the mono-tone sound g (t) sin ω t is emitted by the ultrasonic transducer, the modulated wave sound pressure at a distance x from the axial direction:

p₁＝p₀[1+mg(t-x/c₀)]e^-αxsinω₀(t-x/c₀) (3)

in the formula p₀Ultrasonic sound pressure; omega₀Is the ultrasonic frequency; m is modulation depth, which represents the degree of control of the carrier amplitude by the modulation signal; α is the carrier frequency. Transmitted by ultrasonic transducersThe ultrasonic wave propagates in the air, and can generate a sound signal source of single-frequency audible sound g (t) in a main sound beam, and the sound source equation is as follows:

the second part on the right side of equation (4) is the second harmonic component, i.e., the distortion component. The demodulated sound pressure p is obtained from the equations (3) and (4)_sThe sound pressure in the axial direction r of the ultrasonic transducer array is as follows:

from the equation (5), it can be seen that the audible sound wave demodulated by the ultrasonic wave emitted from the ultrasonic transducer propagating in the air still propagates in the axial direction, and has a very strong directivity. Aiming at the restoration of the sound source direction in the three-dimensional area, according to the Vector-based amplitude translation (VBAP) technology, the VBAP synthesizes the unit Vector of the virtual sound source by using the unit vectors of the positions of 2 or 3 directional loudspeakers (10a, 10b and 10c) and the like, thereby achieving the purpose of constructing the sound source propagation direction. For example, when the number of speakers in each speaker group is 3, three channels can be formed by 3 speakers, and referring to fig. 1, the three channels formed by the speakers are respectively labeled as channel 1, channel 2, and channel 3. The unit vectors of the 3 loudspeakers are considered as basis vectors and the direction of the virtual sound source is derived from a linear combination of them. Setting unit vectors of 3 loudspeakers to a second preset position as l₁，l₂，l₃The gain of the audio signal of each speaker is g₁，g₂，g₃Unit vector of sound source is l₀Then l is₀The table can be as follows:

l₀＝g₁l₁+g₂l₂+g₃l₃ (6)

then the gain can be solved

In the formula I₁＝[l_i1，l_i2，l_i3]，i＝1，2，3。

According to the VBAP principle, 3 loudspeakers can construct a three-dimensional area sound field according to equations (6) and (7). Therefore, the sound wave directional propagation technology based on the ultrasonic waves converts received high-frequency electric energy into mechanical vibration through the ultrasonic transducer, the mechanical vibration is emitted into the air through the ultrasonic transducer, and the sound directional propagation is realized by means of the high directivity of the ultrasonic waves.

The audio system is provided with the directional loudspeaker sets 10, each set comprises the directional loudspeakers, the plurality of directional loudspeakers (10a, 10b and 10c) are respectively arranged at the corresponding first preset positions, and the plurality of directional loudspeakers (10a, 10b and 10c) are aware that when in work, the plurality of directional loudspeakers (10a, 10b and 10c) respectively direct the second preset positions to radiate sound waves so as to form a three-dimensional area sound field in the preset sound transmission area. According to the practical application requirement, the sound wave can be radiated to the designated position, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional loudspeaker set 10, and the audio signal played by the directional loudspeaker set 10 cannot be received at the places except the sound field of other three-dimensional areas, so as to realize the audio signal independent partition playing function. The invention is beneficial to improving the privacy of audio playing of the pos1 of the user, and can meet the requirements of different pos1 on audio signals in the same space.

Referring to fig. 1 to fig. 5, in an embodiment, the number of the directional speaker groups 10 is multiple, and each of the directional speaker groups 10 is separately disposed in a predetermined sound transmission area.

In this embodiment, the audio system may be applied to vehicles such as cars, trains, airplanes, and may also be applied to public areas such as movie theaters, conference rooms, and the like. In vehicles such as automobiles, trains and airplanes and public areas such as movie theaters and conference rooms, more than one user pos1 is provided, for example, when the current sound box equipment plays audio signals, all people in the automobiles can simultaneously sense the audio signals, the requirements of different people are different and cannot be met, and the audio system also stays in the traditional direct playback and cannot realize the audio three-dimensional area playback. For example, a driver needs to listen to navigation information, a passenger in a copilot needs music, a passenger in the rear row needs to have a rest and is silent, the rest cannot be satisfied at the same time, and three-dimensional reproduction of music cannot be realized by playing back music.

For this reason, in the present embodiment, the directional speaker groups 10 are arranged in multiple groups, and each group of directional speaker groups 10 may construct a three-dimensional area sound field, so that three-dimensional area audio is divided and independent. The preset sound transmission area is also arranged at a corresponding place according to different applicable scenes of the audio system, and specifically can be a seat position in a vehicle compartment, a seat in a movie theater, a comfortable chair, a movable backrest armchair, or a sofa seat position in a home entertainment room, and the like, wherein each user pos1 is in an active position in the area. The present embodiment may provide one directional speaker group 10 for each seat. The directional speaker groups 10 are arranged in an array. The preset sound transmission areas are spaced from each other, or the audio signal radiated by each directional speaker group 10 can be perceived by the user pos1 only in the preset sound transmission area corresponding to the directional speaker group 10, and cannot be perceived by the user pos1 in other areas.

Referring to fig. 1 to 5, in an embodiment, the audio system further includes:

a plurality of audio input interfaces AU-in, the number of the audio input interfaces AU-in corresponding to the number of the directional speaker set 10, each audio input interface AU-in accessing a channel of audio signals;

a plurality of audio processors 20, an input end of each audio processor 20 is connected to one of the audio input interfaces AU-in, and a plurality of output ends of each audio processor 20 are connected to a plurality of directional speakers (10a, 10b, 10c) of a set of the directional speaker set 10 in a one-to-one correspondence; wherein the content of the first and second substances,

each of the audio processors 20 is configured to convert the accessed audio signals into audio signals of multiple channels, and output the audio signals of the channels to corresponding directional speakers.

In this embodiment, the audio input interfaces AU-in may be digital audio access ports or analog audio access ports, a plurality of audio input interfaces AU-in are respectively accessed to an audio signal, the audio processor 20 may decode, modulate, amplify, filter, mix, and the like the audio signal, and each audio processor 20 may generate audio signals of a plurality of channels according to the number of speakers in each set of directional speaker group 10, and output the audio signals to each directional speaker, and each directional speaker may convert the audio signals into mechanical vibrations of a corresponding channel according to the received audio signals. The audio signals accessed by each audio input interface AU-in may be the same or different, for example, when the audio system is applied to vehicles such as automobiles, four three-dimensional area sound fields are respectively set up in a cab, a copilot, a left rear seat and a right rear seat, the three-dimensional area sound field corresponding to the cab can play navigation information required by a driver, the three-dimensional area sound field corresponding to the copilot can play music, the three-dimensional area sound fields corresponding to the left rear seat and the right rear seat can not play audio, that is, the audio input interfaces AU-in corresponding to the three-dimensional area sound fields corresponding to the left rear seat and the right rear seat do not access the audio signals.

Referring to fig. 1 to 5, in an embodiment, the audio system further includes:

a plurality of control switches (S1, S2, S3), one of which is disposed in series between each two input terminals of the audio processor 20 (S1, S2, S3); wherein the content of the first and second substances,

when the control switch (S1, S2, S3) is closed, the two audio processors 20 connected to the control switch process the accessed audio signals and output the processed audio signals to the corresponding directional speakers, so as to realize the audio synchronous playing of the preset sound transmission areas.

In this embodiment, the control switches (S1, S2, S3) are bidirectional switches, that is, the audio signal inputted from one audio input interface AU-in can be outputted to the input terminal of another audio processor 20 through the control switches, or the audio signal inputted from another audio input interface AU-in and one audio input interface AU-in can be inputted to the audio processor 20. And a control switch is arranged between every two audio input interfaces AU-in series. A plurality of control switches (S1, S2, S3) can form a switch array, and the control switches can realize synchronous playing of an audio signal on a plurality of preset sound transmission areas. Controlling the on/off of each control switch by one audio input interface AU-in can output the accessed audio signals to all audio processors 20 at the same time, thereby realizing that the sound fields of all three-dimensional areas in the whole area play the same audio signals at the same time. The method can also realize that any two or more than two three-dimensional area sound fields play the same audio signal at the same time, thereby forming the permutation and combination of the three-dimensional area sound fields playing the audio at the same time. For example, when the audio system is applied to a movie theater, the control switches connected with any one of the multiple audio input interfaces AU-in can be controlled to be all conducted, and then all three-dimensional area sound fields in a playing hall can be played simultaneously. When the audio system is applied to a vehicle such as a four-seater car, four three-dimensional zone sound fields are respectively established in a cab, a passenger compartment, a left rear seat and a right rear seat. By controlling the on/off of the control switch, the audio signal can be played in four three-dimensional area sound fields simultaneously, also can be played in two three-dimensional area sound fields corresponding to the cab and the auxiliary cab, or the two three-dimensional area sound fields corresponding to the cab and the left rear seat, so that the function of playing the audio signal in an independent partition mode is realized.

Referring to fig. 1 to 5, in an embodiment, the audio processor 20 is further configured to process the audio signal into audio signals of a plurality of channels according to a stored vector position between the second preset position and a plurality of the first preset positions, and output the audio signal of each channel to a corresponding directional speaker.

It is understood that the first preset position and the second preset position corresponding to each directional speaker group 10 may be set to be the same or different. In addition, according to the difference of the head position of the user pos1, the second preset position is set differently, and in this embodiment, after each directional speaker is installed at the first preset position, the vector positions of the first preset position and the second preset position are determined, so as to determine the operating parameters of each directional speaker. Specifically, a vector position library may be established according to the azimuth information between each first preset position and each second preset position, and a database may also be established according to frequency responses of sounds with different intensities and different frequencies generated at the eardrum of the human ear, before the audio signal is output to the speaker, a convolution operation is performed by using the vector position and the database and a head related function, so that the audio signal includes information of the sound source position and the distance, thereby forming a three-dimensional audio sound field. For example, where used in the middle, separate audio inputs are provided for each seat at different distances. One audio processor 20 corresponds to one seat (preset sound transmission area), and vector information of the ultrasonic transducer connected with the audio processor 20 can be stored in advance. When the audio signal is input to the audio processor 20, the audio processor 20 may process the audio signal according to the vector information stored in advance and then output the processed audio signal to the ultrasonic transducers connected to the audio processor, so as to form a corresponding three-dimensional region sound field in each preset propagation region.

It is understood that in other embodiments, the audio processor 20 may also control the operation state of the speaker at each first preset position according to the usage habit of the user pos1, such as only one sound channel or multiple sound channels simultaneously.

Referring to fig. 2, in an embodiment, each of the audio processors 20 includes:

the audio modulation circuit 21 is connected with one audio input interface AU-in, and the audio modulation circuit 21 is configured to modulate an accessed audio signal and output the modulated audio signal to the corresponding directional speaker;

the two input ends of the audio amplitude modulation circuit 22 are respectively connected with the audio modulation circuit 21 and the carrier signal input end, and the audio amplitude modulation circuit 22 is used for carrying out amplitude modulation on the accessed modulation signal and the carrier signal;

and the power amplifier 23 is arranged between the audio amplitude modulation circuit 22 and the ultrasonic transducer in series and is used for amplifying the audio signal and outputting the amplified audio signal to the ultrasonic transducer.

In this embodiment, the audio modulation circuit 21 processes an input audio signal to generate a modulation signal related to the input audio signal. The audio amplitude modulation circuit 22 amplitude-modulates the modulation signal with the carrier signal. In some embodiments, the audio processor 20 further includes a mixer, which may include an analog multiplier and a low-pass filter, and the modulated signal and the carrier signal are mixed by the analog multiplier and the low-pass filter, and then the mixed signal is output after being power amplified by the power amplification circuit.

Wherein the amplitude is U_ΩmAs a modulated signal, carrier frequency f_c40kHz, amplitude U_cmAs a carrier signal, the amplitude modulated signal can then be obtained according to the following formula:

u_AM(t)＝U_cm(1+mcos2πf_Ωt)cos2πf_ct (8)

in the formulak_aIs a proportionality constant determined by the modulation circuit.

Accordingly, the audio processor 20 modulates the input audio signal and then emits it by the ultrasonic transducer. According to the theory basis of ultrasonic directional propagation, ultrasonic waves emitted by the ultrasonic transducer are propagated in the air, and input audio signals can be generated in the directionally propagated sound beams, so that the directional propagation of the audio signals can be realized.

The invention also provides a control method of the audio system, wherein the audio system comprises a plurality of directional loudspeaker groups, and each directional loudspeaker group is arranged in a preset sound transmission area; the control method of the audio system comprises the following steps:

s100, acquiring an audio system control instruction;

in this embodiment, the audio system control instruction may be a voice instruction, a key instruction, or a control instruction automatically generated by a sensor or the like. The audio system control instruction can be used for independently controlling one directional loudspeaker set to work, can also be used for controlling a plurality of directional loudspeaker sets to work simultaneously, and can be specifically controlled according to the actual application requirements of clients.

Step S200, according to the obtained audio system control instruction, controlling a corresponding directional speaker group of the plurality of directional speaker groups to work, so as to play an audio signal in the corresponding preset sound transmission area.

In this embodiment, the audio system may be applied to a vehicle and the like, and a place with a requirement of an independent sound environment is provided. And responding to the acquired audio system control instruction, and enabling each directional loudspeaker group to be in different states and playing an audio signal corresponding to the audio system control instruction. For example, when the audio system is applied to a vehicle such as a four-seater car, four three-dimensional zone sound fields are respectively established in a cab, a passenger compartment, a left rear seat and a right rear seat. And when an audio system control instruction representing the cab voice navigation is received, controlling a directional loudspeaker set corresponding to the cab to work and playing the voice navigation. And when an audio system control instruction for representing the playing of the music of the copilot is received, controlling the directional loudspeaker set corresponding to the copilot to work and playing the corresponding music. Other directional loudspeaker sets (such as a rear seat) which do not receive the control instruction of the audio system do not play the audio signal. In addition, according to the received audio system control instruction, the HIA can control all three-dimensional area sound fields in the whole area to play the same audio signal at the same time. Any two or more than two three-dimensional area sound fields can be controlled to play the same audio signal at the same time, so that the permutation and combination of the three-dimensional area sound fields playing audio at the same time is formed. For example, according to a received audio system control instruction, an audio signal may be played in four three-dimensional area sound fields simultaneously, or may be played in two three-dimensional area sound fields corresponding to a cab and a passenger cab, or may be played in two three-dimensional area sound fields corresponding to the cab and a left rear seat, so as to implement an audio signal independent partition playing function.

The control method of the audio system further includes the steps of:

s300, acquiring a user target position in a preset voice transmission area;

in this embodiment, the user target position may be a common state position of the user pos1 in the preset sound transmission area, such as sitting in the preset sound transmission area or lying in the preset sound transmission area when the user pos1 is in the preset sound transmission area. The user target position may be a position where the user pos1 is located in a preset sound transmission area and the head is located, and may be a midpoint between two ears of the listener. When the directional speaker is mounted, the sound outlet of the directional speaker can be directed to the position of the head. The second preset position may be a fixed position or an adjustable position, and when the target position of the user is set to be the fixed position, each directional speaker is fixed to the first preset position

And step S400, adjusting the angle of the sound outlet of the directional loudspeaker in the corresponding directional loudspeaker group according to the user target position.

In this embodiment, the target position of the user is an adjustable position, for example, when the user changes from sitting to lying on his back, the head position may be deviated, and at this time, the second preset position may be adjusted by adjusting the installation position of the directional speaker or adjusting the angle of the sound outlet of the directional speaker, so that the sound radiation direction of the directional speaker always follows the pos1 of the user. In a specific application, the second preset position can be adjusted manually, or the position of the head of the user pos1 can be detected by arranging a camera and a sensor, such as an infrared sensor, and the like, and then the directional loudspeaker is driven to move by a motor and the like.

The invention also provides a control device of the audio system, which comprises the audio system; and the number of the first and second groups,

the control program of the audio system is stored in the memory, and when the control program of the audio system is executed by the processor, the steps of the control method of the audio system are realized.

The detailed structure of the audio system can refer to the above embodiments, and is not described herein; it can be understood that, since the control device of the audio system of the present invention uses the audio system, the embodiment of the control device of the audio system of the present invention includes all technical solutions of all embodiments of the audio system, and the achieved technical effects are also completely the same, and are not described herein again.

In this embodiment, the memory may be used to store software programs as well as various data. The memory may mainly include a storage program area and a storage data area, and optionally, the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, etc.), and the like; the storage data area may store data (such as audio data, etc.) created according to the use of the cellular phone, etc.

The processor is a control center of the audio system applied to the vehicle or other equipment, connects each part of the whole mobile terminal by various interfaces and lines, and executes various functions and processes data of the mobile terminal by running or executing software programs and/or modules stored in the memory and calling data stored in the memory, thereby carrying out the overall monitoring of the mobile terminal. A processor may include one or more processing units; optionally, the processor may integrate an application processor and a modem processor, optionally, the application processor primarily handles operating systems, user interfaces, applications, etc., and the modem processor primarily handles wireless communications.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method according to each embodiment of the present invention.

The invention further provides a vehicle, and the control device of the audio system of the embodiment of the invention can be applied to the vehicle.

Referring to fig. 4, the vehicle includes a cavity 100 and an audio system as described above; wherein the content of the first and second substances,

the audio system is disposed on the cavity 100 and/or within the cavity 100. The vehicle comprises a cavity 100 and an audio system as described above. The detailed structure of the audio system can refer to the above embodiments, and is not described herein; it can be understood that, since the above-mentioned audio system is used in the vehicle of the present invention, the embodiment of the vehicle of the present invention includes all technical solutions of all embodiments of the above-mentioned audio system, and the achieved technical effects are also completely the same, and are not described herein again.

In the present embodiment, the audio system may be applied to a vehicle such as an automobile, a train, an airplane, and the like, and the present embodiment is described by taking an application to a car as an example, the speaker group in the audio system may be provided according to the number of seats 200 of the vehicle, and each speaker may be provided on an operation panel, a ceiling of a vehicle body, or a front seat 200. The speaker may be positioned towards the user's head, e.g., a face arrangement, radiating audio from the front and back towards the user. Or may be positioned toward the top of the user's head, and the speakers may be positioned in their respective seats to radiate audio from the back toward the front toward the user. The audio system is applied to a vehicle, a plurality of directional loudspeakers (10a, 10b, 10c) are respectively arranged at corresponding first preset positions by arranging corresponding directional loudspeaker sets 10 corresponding to all seats, and each set comprises the directional loudspeaker, so that the plurality of directional loudspeakers (10a, 10b, 10c) respectively radiate sound waves to second preset positions when working, and a three-dimensional area sound field is formed in a preset sound transmission area (around the seats). According to the practical application requirements, the sound waves can be radiated to the designated position, so that the user pos1 in the preset sound transmission area can receive the audio signal played by the directional loudspeaker set 10, and the user pos1 outside the sound field of other three-dimensional areas cannot receive the audio signal played by the directional loudspeaker set 10, so that the audio signal independent partition playing function is realized, and the requirements of users on different seats are met.

Referring to fig. 4 in one embodiment, the vehicle further comprises:

a plurality of seats 200, the audio system having a plurality of directional speaker (10a, 10b, 10c) groups 10, each of the directional speaker groups 10 being disposed corresponding to one of the seats 200.

In the present embodiment, each seat 200 is provided with one directional speaker group 10, each directional speaker group 10 forms a three-dimensional sound field when operating, and the left and right positions of the general vehicle occupant are close to each other, about 1m apart, and the front and rear positions of the occupant are far from each other about 1.5m apart. Due to the sound propagation characteristics, the farther away the distance, the lower the sound pressure, so if left and right occupants have better audio separation, the better the audio separation between front and rear occupants will be. In the present embodiment, the directional speaker set at the driving position is operated, and the directional speaker sets 10 at the other positions are not operated to perform the test, and the driving position is tested separately, as shown in fig. 5, fig. 5 is a frequency response curve of the driving position and the passenger driving position, the frequency response of the driving position reaches 90dB or more, while the frequency response of the passenger driving position is 60dB or less, and the background noise of the general automobile environment is 60dB or more, so it can be stated that when the directional speaker set 10 at the driving position is operated, the passenger driving method perceives the audio information of the driving position, and the audio independent zoning function is realized.

Referring to fig. 4 in one embodiment, the vehicle further comprises a control assembly electrically connected to the audio system.

In this embodiment, the control component may include a central controller, and the control switches are disposed corresponding to the directional speaker groups 10 of the audio system, and the control switches may be manual control switches, such as a touch screen, keys, and the like, or may be centrally controlled by the central controller. The central controller is electrically connected to the audio system, and may control the audio processor 20 and the control switch in the audio system to operate so as to convert audio data received or stored in the memory into an audio signal and output the audio signal as sound when the audio system is in a call signal receiving mode, a call mode, a recording mode, a voice recognition mode, a broadcast receiving mode, or the like. The control assembly may also include, but is not limited to, an engine temperature controller, a cold air heater fan controller, a warning light, a different mode of air blowing mode controller, a defogging device, and a front defogging device.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.