阅读说明：本技术 产生用于通过机动车辆的扬声器输出的声音数据集的方法 (Method for generating a sound data set for output by a loudspeaker of a motor vehicle ) 是由 马克西米利安·恩格尔克 于 2019-06-25 设计创作，主要内容包括：本发明涉及一种产生用于通过机动车辆的扬声器(18)输出的声音数据集(GS)的方法,具有以下步骤：选择表示重复音调序列的第一部分声音数据集(TGS1),选择表示没有重复的音调序列的第二部分声音数据集(TGS2),改变第二部分声音数据集(TGS2),以及组合第一部分声音数据集(TGS1)和第二部分声音数据集(TGS2)以获得所述声音数据集(GS)。(The invention relates to a method for generating a sound data set (GS) for output by a loudspeaker (18) of a motor vehicle, comprising the following steps: -selecting a first partial sound data set (TGS1) representing a repeating sequence of tones, -selecting a second partial sound data set (TGS2) representing a sequence of tones which is not repeated, -altering the second partial sound data set (TGS2), and-combining the first partial sound data set (TGS1) and the second partial sound data set (TGS2) to obtain the sound data set (GS).)

1. A method of generating a sound data set (GS) for output by a loudspeaker (18) of a motor vehicle, having the steps of:

a first partial sound data set (TGS1) representing a repeating sequence of tones is selected,

a second partial sound data set (TGS2) representing a tone sequence without repetition is selected,

changing the second partial sound data set (TGS2), an

Combining the first partial sound data set (TGS1) and the second partial sound data set (TGS2) to obtain the sound data set (GS).

2. The method of claim 1, wherein the first partial sound data set (TGS1) is based on a natural tone sequence and the second partial sound data set (TGS2) is based on a synthetic tone sequence.

3. A method according to claim 1 or 2, wherein at least one parameter of the sound synthesis is varied by means of a randomizer (14a, 14b, 14c) for varying the second partial sound data set (TGS 2).

4. The method of claim 3, wherein the at least one parameter represents a waveform of an oscillator (20), a factor of a mixer (22), a factor of a filter (24), a factor of an amplifier (26), a factor of a modulator (28), a factor of a modulation envelope curve (30), and/or a factor of an envelope curve (32).

5. A computer program product designed to perform the method of any one of claims 1 to 4.

6. An apparatus (2) for generating a sound data set (GS) for output by loudspeakers (18) of a motor vehicle, wherein the apparatus (2) is designed for selecting a first partial sound data set (TGS1) indicative of a repeating tone sequence, selecting a second partial sound data set (TGS2) indicative of a tone sequence which is not repeated, altering the second partial sound data set (TGS2) and combining the first partial sound data set (TGS1) and the second partial sound data set (TGS2) to form the sound data set (GS).

7. The apparatus (2) of claim 6, wherein the first partial sound data set (TGS1) is based on a natural pitch sequence and the second partial sound data set (TGS2) is based on a synthetic pitch sequence.

8. The apparatus (2) according to claim 6 or 7, wherein the apparatus (2) is designed to vary at least one parameter of the sound synthesis with the randomizer (14a, 14b, 14c) to vary the second partial sound data set (TGS 2).

9. The apparatus (2) of claim 8, wherein the at least one parameter represents a waveform of an oscillator (20), a factor of a mixer (22), a factor of a filter (24), a factor of an amplifier (26), a factor of a modulator (28), a factor of a modulation envelope curve (30), and/or a factor of an envelope curve (32).

10. A motor vehicle having a device (2) as claimed in any one of claims 6 to 8.

Technical Field

The invention relates to a method for generating a sound data set for output by a loudspeaker of a motor vehicle.

Background

The interior sound of the motor vehicle and the sound emitted from the motor vehicle into the surroundings play an important role for the impression of the quality of the motor vehicle.

The sound emitted by the motor vehicle may have a conventional/mechanical sound source, such as the slamming of a door, or a synthetic sound source, such as an audio sample that is played through a speaker when a button is pressed.

Most sounds of conventional sound sources sound somewhat differently from time to time. For example, slow or fast closing of the door may result in different sounds. This is understandable because a complex set of factors, such as mechanical force, temperature, NVH (noise, vibration and harshness) characteristics, etc., can affect sound production. The repeated sounds are perceived unconsciously by people, each time slightly changing, as if they were natural.

However, the sound of a motor vehicle with a synthetic sound source is usually played only through the speakers of the motor vehicle and sounds exactly the same each time. The result is that these sounds are considered unnatural or synthetic. In a few cases synthetic sounds, such as HMI (human machine interface) warning or information sounds, may be required, but in most cases the natural acoustic environment inside and around the motor vehicle is considered to be of higher quality.

Above all, in the case of electric motor vehicles, the electric motor as a traction motor hardly produces engine sounds, the perception of the synthesized sounds for other traffic participants (for example pedestrians or cyclists) being greater than the contribution made in the case of motor vehicles with an internal combustion engine as a traction motor.

However, synthetic sounds generally sound unnatural or artificial and appear monotonous as the sound or timbre does not change with each repetition/playback.

Disclosure of Invention

It is therefore an object of the present invention to provide a method by means of which synthetic sounds can be given a naturally varying character.

This object is achieved by a method of generating a sound data set for output by a loudspeaker of a motor vehicle, comprising the steps of:

a first partial sound data set representing a repeated sequence of tones is selected,

a second partial sound data set representing a sequence of tones without repetition is selected,

altering the second partial sound data set, an

The first partial sound data set and the second partial sound data set are combined to obtain a sound data set.

The pitch sequence here refers to a time pitch sequence with ordered features, which may include melodies. The tones of the tone sequence may be individual tones or mixed tones consisting of tones of different frequencies. The pitch may be described by parameters such as pitch value, pitch duration, volume or pitch intensity, and sound or timbre. Timbre (otherwise determined by the ratio of partial pitch amplitudes to each other) refers herein to the mixture of fundamental, overtone and noise components, as well as the temporal distribution of the spectrum and volume.

Thus, the first partial sound data set represents a fixed tone sequence having a predetermined duration, after which the tone sequence repeats itself. In contrast, the second partial sound data set comprises a random sequence of tones and is therefore not repeated.

The sound data set then serves as a basis for generating sounds, e.g. directional sounds, which do not convey any specific messages but have properties such that they are recognizable and noticeable to humans, e.g. the rising sound of a motor vehicle such as a passenger car or a truck.

The solution therefore consists in using sounds that are dynamically and partially randomly generated and that are complex and non-repetitive. Improved acceptance of the synthetic noise in the motor vehicle is thereby achieved and the quality impression of the motor vehicle is increased.

According to one embodiment, the first partial sound data set is based on a natural pitch sequence and the second partial sound data set is based on a synthetic pitch sequence. The natural pitch sequence may be a conventional audio sample. The sequence of tones output on this basis sounds each time as in conventional audio playback. On the other hand, the synthesized pitch sequence is the result of sound synthesis. Sound synthesis here refers to a method for producing artificial sounds or modifying natural sounds. Thus, by combining with the synthesized sound, the sound that looks natural can be changed particularly easily, and no longer has a monotonous effect.

According to another embodiment, at least one parameter of the sound synthesis is varied using the random generator to vary the second partial sound data set. Thus, the synthesized tone sequence is directly altered with an artificial character by using the random number provided by the random generator. Thus, a sound without monotonous effect can be obtained in a particularly simple manner.

According to a further embodiment, the at least one parameter represents a waveform of an oscillator, a factor of a mixer, a factor of a filter, a factor of an amplifier, a factor of a modulator, a factor of a modulation envelope curve and/or a factor of an envelope curve. The volume and/or the contour of the timbre of the tone can thus be varied in a particularly simple manner.

Computer program products for carrying out such a method, apparatuses for generating sound data sets for output by means of a loudspeaker of a motor vehicle, and motor vehicles having such a device also belong to the invention.

Drawings

The invention will now be explained with reference to the drawings, where:

fig. 1 schematically shows an apparatus for generating a sound data set for output by a loudspeaker of a motor vehicle.

Fig. 2 schematically shows further details of the device represented in fig. 1.

Detailed Description

Reference is first made to fig. 1.

An apparatus 2 for generating a sound data set GS for output by a loudspeaker 18 of a motor vehicle is shown.

The motor vehicle may be a passenger vehicle, which has an electric motor as traction motor and therefore emits particularly little operating noise during operation.

In other words, the sound data set GS serves as a basis for generating a so-called directional sound. Directional sound refers to characteristic sound that does not convey any particular message, but has characteristics that make it recognizable and noticeable to humans, such as the rising sound of a motor vehicle such as a passenger car or truck.

The apparatus 2 comprises a plurality of sound devices 6a, 6b, 6c, a random generator 8a and an output mixer 34. In the present exemplary embodiment, the apparatus 2 comprises three sound devices 6a, 6b, 6 c.

In the present exemplary embodiment, each sound device 6a, 6b, 6c includes a player device 10a, 10b, 10c, a sound generator 12a, 12b, 12c, and a random generator 14a, 14b, 14c, respectively.

The device 2 is connected to a database 4 for data transmission so that the device 2 can read out the sound data GD from the database 4, as will be explained in more detail later.

Before starting to operate the device 2, the driver 36 can enter input data ED into the database 4 via the HMI38 of the motor vehicle, the input data ED representing his personal preferences, for example.

After the operation starts, the module 40 of the database 4 checks whether the sound signal generation request GSA exists. If there is a sound signal generation request GSA, sound data GD corresponding to a predetermined sound S is selected.

In the present exemplary embodiment, the sound data GD includes predetermined values VW for, for example, a tone sequence of natural origin, a weighting function GF and a threshold GW, and a start signal SS. The weighting function GF and the threshold GW are operating parameters of the random generator 14b and specify a threshold value for the random value ZW supplied by the random generator 14 b.

In the present exemplary embodiment, of the three sound devices 6a, 6b, 6c, only the sound device 6a and the second sound device 6b are active, each providing a first partial sound data set TGS1 and a second partial sound data set TGS2, respectively, which are mixed together in the output mixer 34 to form the sound data set GS.

In the present exemplary embodiment, the first partial sound data set TGS1 provided by the first sound device 6a is based on a natural tone sequence. The natural tone sequence may be a conventional audio sample played by an active player device 10a, such as a conventional audio player, while the sound generator 12a and the random generator 14a are inactive. This partial sound data set TGS1 or the sound or tone color of the tone sequence based on its output sound each time sounds like a conventional audio playback.

In contrast, the second partial sound data set TGS2 played by the second sound device 6b is based on a synthesized tone sequence in the present exemplary embodiment. To generate the second partial sound data set TGS2, the sound generator 12b and the random generator 14b in the present exemplary embodiment are active, while the player device 10b of the second sound device 6b is inactive.

When the predetermined value VW is directly transmitted to the sound generator 12b, the weighting function GF and the threshold value GW are transmitted to the random generator 14 b. The weighting function GF and the threshold GW are operating parameters of the random generator 14b and specify a threshold value for the random value ZW supplied by the random generator 14 b.

The random value ZW is then transmitted to the sound generator 12b, and the sound generator 12b then provides the second partial sound data set TGS2 based on the predetermined value VW and the random value ZW.

The output mixer 34 has adjustable mixing parameters MP, e.g. the signal level ratio of the two partial sound data sets TGS1, TGS 2. The value of the adjustable mixing parameter MP of the output mixer 34 is provided by the randomizer 8 a. Therefore, the mixture of the two partial sound data sets TGS1, TGS2 can be changed in a random manner.

The sound data set GS is then amplified by the power amplifier 16 and output by the loudspeaker 18. The speaker 18 then radiates sound into the surroundings of the motor vehicle in order to warn other traffic participants (for example pedestrians or cyclists) of the approach of the motor vehicle.

Reference is now also made to fig. 2.

The figure shows that the predetermined value VW is fed to the oscillator 20, the mixer 22, the modulator 28 with the modulation envelope curve module 30 and the envelope curve module 32, while the random value ZW is fed to the filter 24 and the amplifier 26 of the sound device 6 b.

In the present exemplary embodiment, the modulation envelope module 30 comprises adjustable parameters for different phases of the simplified modulation envelope for the sound or tone, respectively, such as attack PA, attenuation PD, sustain PS and release PR.

The envelope curve module 32 in the present exemplary embodiment also comprises adjustable parameters for different phases of the simplified envelope curve of the sound or tone, respectively, such as attack PA, attenuation PD, sustain PS and release PR.

Other forms of sound synthesis, such as waveform synthesis, particle synthesis, or subtractive synthesis, may also be used, unlike the present exemplary embodiment.

Waveform synthesis, which refers here to an economical form of generating acoustic tones, is technically relatively easy to implement, for example with a synthesizer or sound card.

For this purpose, the waveform of the sound or timbre to be produced later, for example the oscillation curve of a single tone of a particular tone, i.e. the reference tone, is recorded as electrically measured by a microphone. Usually this is the central C (C'). The measured waveform can then be easily converted back into the recorded tone through the speaker. The playback speed can be varied here, where appropriate, so that not only the pitch of the originally recorded tone can be played, but also any desired tone from the scale.

Particle synthesis is a method used in some synthesizers and programs to generate artificial sounds. Here a continuous sound is simulated that contains many separate parts. These individual parts, i.e. particles, are very short digital sound fragments, typically less than 50 milliseconds in length. If this limit is exceeded, the listener can identify the segment as an independent sound event.

In subtractive synthesis, an oscillator (e.g. VCO, voltage controlled oscillator) generates the original sound material, which is then further processed by sound modification modules (filters, envelope curve generators, amplifier modules, etc.). The desired sound or timbre is achieved because the unwanted frequency components are filtered out or reduced (subtracted) from the frequency spectrum of the oscillator, which is typically rich in overtones.

Overall, complex and non-repeating dynamically and partially randomly generated sounds can thus be obtained, which leads to an improved acceptance of the synthesized sound in the motor vehicle and increases the quality impression of the motor vehicle.

List of reference numerals:

2 device

4 database

6a sound equipment

6b sound equipment

6c sound equipment

8a random generator

10a player apparatus

10b player device

10c Player device

12a sound generator

12b sound generator

12c sound generator

14a random generator

14b random generator

14c random generator

16 power amplifier

18 loudspeaker

20 Oscillator

22 frequency mixer

24 filter

26 amplifier

28 modulator

30 modulation envelope curve module

32 envelope curve module

34 output mixer

36 driver

38 HMI

40 module

ED input data

GD voice data

GF weighting function

GS Sound data set

GW threshold

MP mixing parameter

Attack of PA

Attack of PA

PD attenuation

PD' attenuation

PS maintenance

PS' maintenance

PR release

PR' Release

S sound

SS start signal

TGS1 partial sound data set

TGS2 partial sound data set

VW predetermined value

ZW random value