阅读说明：本技术 传输数字音频和电源信号的方法、系统、设备及存储介质 (Method, system, device and storage medium for transmitting digital audio and power signals ) 是由 陈涛 欧阳典勇 史立庆 于 2021-10-13 设计创作，主要内容包括：本发明公开一种传输数字音频和电源信号的方法、系统、设备及存储介质,所述方法为：将数字音频接口的电平信号转换成差分信号,将差分信号经过电容隔直后得到隔直差分信号；将电相关信号经过低通滤波后接入到隔直差分信号上得到综合差分信号,发送综合差分信号至信号接收端。在接收到综合差分信号后,将综合差分信号进行拆分得到电相关信号以及隔直差分信号；将电相关信号经过低通滤波后发送给电源接收设备,完成电源信号的传输；将隔直差分信号经过电容隔直后恢复得到差分信号,将差分信号转换成电平信号；将电平信号参照数字音频接口标准要求进行时序调整,完成数字音频信号的传输。从而简单可靠、高效低成本地远距离传输数字音频和电源信号。(The invention discloses a method, a system, equipment and a storage medium for transmitting digital audio and power signals, wherein the method comprises the following steps: converting a level signal of a digital audio interface into a differential signal, and blocking the differential signal by a capacitor to obtain a blocking differential signal; and the electric related signals are subjected to low-pass filtering and then are accessed to the blocking differential signals to obtain comprehensive differential signals, and the comprehensive differential signals are sent to a signal receiving end. After receiving the comprehensive differential signal, splitting the comprehensive differential signal to obtain an electrical correlation signal and a blocking differential signal; the electric relevant signals are sent to power supply receiving equipment after low-pass filtering, and transmission of the power supply signals is completed; the blocking differential signal is restored after being blocked by the capacitor to obtain a differential signal, and the differential signal is converted into a level signal; and performing time sequence adjustment on the level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal. Therefore, the digital audio and the power supply signal are simply, reliably, efficiently and inexpensively transmitted in a long distance.)

1. A method for transmitting digital audio and power signals, which is applied to a signal transmitting end, the method for transmitting digital audio and power signals comprising:

converting a level signal of a digital audio interface into a differential signal, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

and the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end.

2. The method of transmitting digital audio and power signals according to claim 1, further comprising:

judging whether to transmit the digital audio signal and the power supply signal at the same time;

if the digital audio signal and the power supply signal are transmitted simultaneously, the step of converting the level signal of the digital audio interface into a differential signal is executed;

and if only the digital audio signal is transmitted and the power supply signal is not transmitted, directly sending the differential signal to a signal receiving end.

3. The method for transmitting digital audio and power signals according to claim 1, wherein the step of low-pass filtering the power signal and the GND signal and then adding the power signal and the GND signal to the dc blocking differential signal comprises:

the power supply signal is connected to the positive end or the negative end of the blocking differential signal through low-pass filtering;

and the GND signal is connected to the negative end or the positive end of the DC blocking differential signal through low-pass filtering, and the connection of the GND signal and the power supply signal is opposite.

4. A method for transmitting digital audio and power signals, which is applied to a signal receiving end, the method for transmitting digital audio and power signals comprising:

after receiving the comprehensive differential signal, splitting the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

5. The method of transmitting digital audio and power signals according to claim 4, further comprising:

after receiving the comprehensive differential signal, judging whether the comprehensive differential signal simultaneously comprises a power supply signal, a GND signal and a DC blocking differential signal;

if the integrated differential signal comprises a power supply signal, a GND signal and a blocking differential signal, executing the step of splitting the integrated differential signal;

if only the differential signal is contained and the power supply signal is not contained, converting the received differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

6. The method of transmitting digital audio and power signals according to any one of claims 1 to 5, further comprising:

when the digital audio signal is transmitted, the level signal of the digital audio interface is converted into a differential signal by using the differential signal transmitting chip, and the differential signal is converted into the level signal of the digital audio interface by using the differential signal receiving chip.

7. The method of transmitting digital audio and power signals according to any one of claims 1 to 5, further comprising:

when the power supply signal is transmitted, the low-pass filter is used for connecting the power supply signal and the GND signal to the DC blocking differential signal and sending the power supply signal and the GND signal to the power supply receiving equipment;

and converting the DC blocking differential signal into a differential signal after the capacitor DC blocking is carried out on the differential signal by using a DC blocking capacitor, and converting the DC blocking differential signal into the differential signal after the capacitor DC blocking is carried out on the DC blocking differential signal.

8. A system for transmitting digital audio and power signals is characterized in that the system for transmitting digital audio and power signals comprises a signal transmitting end and a signal receiving end,

converting a level signal of a digital audio interface into a differential signal at the signal transmitting end, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are connected to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end;

after receiving the comprehensive differential signal, splitting the comprehensive differential signal at the signal receiving end to obtain a power signal, a GND signal and a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

9. An apparatus for transmitting digital audio and power signals, the apparatus comprising: a low pass filter, a dc blocking capacitor, an RS422/RS48 transmitting chip, an RS422/RS48 receiving chip, a memory, a processor and a program for transmitting digital audio and power signals stored on and executable on the memory, the program for transmitting digital audio and power signals being executed by the processor to implement the steps of the method for transmitting digital audio and power signals as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, having stored thereon a program for transmitting digital audio and power signals, which when executed by a processor, carries out the steps of the method for transmitting digital audio and power signals according to any one of claims 1 to 7.

Technical Field

The present invention relates to the field of multimedia communications, and more particularly, to a method, system, device, and computer-readable storage medium for transmitting digital audio and power signals.

Background

In a conference system, a public address system and a recording and broadcasting system, microphones are generally used for picking up sound, but a single microphone is often not far enough in sound pick-up distance, and a plurality of microphones are required to be cascaded. The common cascading methods are: 1. the audio frequency adopts a 2.4G cascade mode, each microphone needs a relatively expensive wireless module, and the wireless module has relatively large delay. And 2, USB cascade connection, audio cascade connection is carried out through a USB port, and clock synchronization is troublesome. 3. Analog cascading, which is audio cascading through an analog line, has more cables and higher cost. 4. Ethernet is cascaded, and the microphones are cascaded in an Ethernet mode, and because the two microphones need to be synchronized, a high-precision crystal oscillator or a 1588 protocol synchronization mode and the like are needed. Generally, the current mode is relatively high in cost or the synchronous mode is complex.

The digital interface of audio is I2S, PDM and TDM, etc., and I2S, PDM and TDM are basically TTL or CMOS level and are mainly used for the connection of board or board to board. And the connection between the devices can not directly use audio interfaces such as I2S, PDM and TDM due to attenuation, interference and the like.

Disclosure of Invention

The invention mainly aims to provide a method for transmitting digital audio and power signals, and aims to solve the technical problems of complex and tedious long-distance transmission mode and high cost of digital audio signals in the prior art.

In order to achieve the above object, the present invention provides a method for transmitting digital audio and power signals, which is applied to a signal transmitting end, the method for transmitting digital audio and power signals comprising:

converting a level signal of a digital audio interface into a differential signal, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

and the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end.

Optionally, the method of transmitting digital audio and power signals further comprises:

judging whether to transmit the digital audio signal and the power supply signal at the same time;

if the digital audio signal and the power supply signal are transmitted simultaneously, the step of converting the level signal of the digital audio interface into a differential signal is executed;

and if only the digital audio signal is transmitted and the power supply signal is not transmitted, directly sending the differential signal to a signal receiving end.

Optionally, the step of low-pass filtering the power signal and the GND signal and then connecting to the dc blocking differential signal includes:

the power supply signal is connected to the positive end or the negative end of the blocking differential signal through low-pass filtering;

and the GND signal is connected to the negative end or the positive end of the DC blocking differential signal through low-pass filtering, and the connection of the GND signal and the power supply signal is opposite.

In order to achieve the above object, the present invention provides a method for transmitting digital audio and power signals, which is applied to a signal receiving end, the method for transmitting digital audio and power signals comprising:

after receiving the comprehensive differential signal, splitting the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

Optionally, the method of transmitting digital audio and power signals further comprises:

after receiving the comprehensive differential signal, judging whether the comprehensive differential signal simultaneously comprises a power supply signal, a GND signal and a DC blocking differential signal;

if the integrated differential signal comprises a power supply signal, a GND signal and a blocking differential signal, executing the step of splitting the integrated differential signal;

if only the differential signal is contained and the power supply signal is not contained, converting the received differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

Optionally, the method of transmitting digital audio and power signals further comprises:

when the digital audio signal is transmitted, the level signal of the digital audio interface is converted into a differential signal by using the differential signal transmitting chip, and the differential signal is converted into the level signal of the digital audio interface by using the differential signal receiving chip.

Optionally, the method of transmitting digital audio and power signals further comprises:

when the power supply signal is transmitted, the low-pass filter is used for connecting the power supply signal and the GND signal to the DC blocking differential signal and sending the power supply signal and the GND signal to the power supply receiving equipment;

and converting the DC blocking differential signal into a differential signal after the capacitor DC blocking is carried out on the differential signal by using a DC blocking capacitor, and converting the DC blocking differential signal into the differential signal after the capacitor DC blocking is carried out on the DC blocking differential signal.

In addition, to achieve the above object, the present invention also provides a system for transmitting digital audio and power signals, which includes a signal transmitting end and a signal receiving end,

converting a level signal of a digital audio interface into a differential signal at the signal transmitting end, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are connected to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end;

after receiving the comprehensive differential signal, splitting the comprehensive differential signal at the signal receiving end to obtain a power signal, a GND signal and a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

Further, to achieve the above object, the present invention also provides an apparatus for transmitting digital audio and power signals, comprising: a low pass filter, a blocking capacitor, an RS422/RS48 transmitting chip, an RS422/RS48 receiving chip, a memory, a processor and a program for transmitting digital audio and power signals stored in and executable on the memory, the program for transmitting digital audio and power signals being executed by the processor to implement the steps of the method for transmitting digital audio and power signals as described above.

Further, to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a program for transmitting digital audio and power signals, which when executed by a processor, implements the steps of the method for transmitting digital audio and power signals as described above.

According to the method, the equipment and the computer readable storage medium for transmitting the digital audio and the power supply signal, the level signal of the digital audio interface is converted into the differential signal at the signal transmitting end, and the differential signal is blocked by the capacitor to obtain the blocking differential signal; and the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end. At a signal receiving end, after receiving a comprehensive differential signal, splitting the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal; the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed; restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal; and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal. Therefore, the digital audio signal and the power supply signal are simply, reliably, efficiently and inexpensively transmitted in a long distance.

Drawings

Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a signal transmitting end according to an embodiment of the method for transmitting digital audio and power signals of the present invention;

FIG. 3 is a schematic flowchart of a signal receiving end according to an embodiment of the method for transmitting digital audio and power signals of the present invention;

fig. 4 is a schematic diagram of data transmission according to an embodiment of the method for transmitting digital audio and power signals.

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

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.

The operation equipment of the embodiment of the invention can be a PC, and can also be a mobile terminal equipment with a display function, such as a smart phone, a tablet computer, an electronic book reader, a portable computer and the like.

As shown in fig. 1, the operation device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.

Optionally, the operation device may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. In particular, the light sensor may include an ambient light sensor and a proximity sensor. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the mobile device is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of the mobile device, and related functions (such as pedometer and tapping) for vibration recognition; of course, the mobile operation device may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, which are not described herein again.

Those skilled in the art will appreciate that the operational equipment configuration shown in FIG. 1 does not constitute a limitation of the operational equipment, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.

As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a program for transmitting digital audio and power signals.

In the operating device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to invoke the program stored in the memory 1005 that transfers the digital audio and power signals and perform the following operations:

converting a level signal of a digital audio interface into a differential signal, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

and the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

judging whether to transmit the digital audio signal and the power supply signal at the same time;

if the digital audio signal and the power supply signal are transmitted simultaneously, the step of converting the level signal of the digital audio interface into a differential signal is executed;

and if only the digital audio signal is transmitted and the power supply signal is not transmitted, directly sending the differential signal to a signal receiving end.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

the power supply signal is connected to the positive end or the negative end of the blocking differential signal through low-pass filtering;

and the GND signal is connected to the negative end or the positive end of the DC blocking differential signal through low-pass filtering, and the connection of the GND signal and the power supply signal is opposite.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

after receiving the comprehensive differential signal, splitting the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

after receiving the comprehensive differential signal, judging whether the comprehensive differential signal simultaneously comprises a power supply signal, a GND signal and a DC blocking differential signal;

if the integrated differential signal comprises a power supply signal, a GND signal and a blocking differential signal, executing the step of splitting the integrated differential signal;

if only the differential signal is contained and the power supply signal is not contained, converting the received differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

when the digital audio signal is transmitted, the level signal of the digital audio interface is converted into a differential signal by using the differential signal transmitting chip, and the differential signal is converted into the level signal of the digital audio interface by using the differential signal receiving chip.

Further, the processor 1001 may call a program stored in the memory 1005 that transfers digital audio and power signals, and also perform the following operations:

when the power supply signal is transmitted, the low-pass filter is used for connecting the power supply signal and the GND signal to the DC blocking differential signal and sending the power supply signal and the GND signal to the power supply receiving equipment;

and converting the DC blocking differential signal into a differential signal after the capacitor DC blocking is carried out on the differential signal by using a DC blocking capacitor, and converting the DC blocking differential signal into the differential signal after the capacitor DC blocking is carried out on the DC blocking differential signal.

Referring to fig. 2, the present invention provides a method for transmitting digital audio and power signals, which is applied to a signal transmitting end, the method for transmitting digital audio and power signals including:

step A, converting a level signal of a digital audio interface into a differential signal, and blocking the differential signal through a capacitor to obtain a blocking differential signal.

The Digital Audio interface DAI, i.e., Digital Audio Interfaces, represents the manner in which Digital Audio signals are transmitted at board level or between boards. The transmission standards of digital audio signals, such as I2S (Integrated interface Sound, Integrated circuit built-in audio bus), PCM (Pulse Code Modulation), PDM (Pulse Density Modulation), and the like, are mainly used for transmitting audio signals between chips on the same circuit board. The level signal in the embodiment of the present invention includes I2S, and TTL (transistor-transistor logic) or CMOS (Complementary Metal Oxide Semiconductor) levels of digital audio interfaces such as PDM and TDM (time-division multiplexing) or the like. The differential signal in the embodiment of the invention adopts two serial port communication level standards of RS422/RS485, namely two electrical protocols, which are the specifications of electrical characteristics and physical characteristics, act on a transmission path of data and do not contain a data processing mode. More specifically, the electrical characteristics also determine the connection mode of the lines, such as RS485, and the data is represented by differential levels, so that two lines are necessary to achieve the basic requirement of data transmission, and 4 lines are necessary to achieve full duplex. The capacitor blocking means that the capacitor is formed by two polar plates with a layer of insulator in between. When the capacitor is switched on, the charging process takes place only for the brief time it has just been switched on, during which the current flows through the capacitor. Since the voltage of the direct current power supply is constant, the voltage at two ends of the capacitor is also constant, and no potential difference exists, no current flows in the capacitor, which is equivalent to the fact that the capacitor cuts off the direct current, namely the capacitor can play a role in cutting off the direct current.

In an embodiment of the present invention, digital signals of I2S, PDM and TDM, such as CLK (Clock) signals and synchronization signals of PDM, are converted into RS422/RS485 differential signals, and the converted RS422/RS485 differential signals are passed through a dc blocking capacitor to obtain dc blocking differential signals.

And B, the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end.

GND (Ground, wire Ground) represents a Ground line or a 0 line, and corresponds to the negative pole of one power supply for the power supply. Filtering is an operation of filtering out specific band frequencies in a signal, and is an important measure for suppressing and preventing interference, wherein low-pass filtering allows components of lower frequencies in the signal to pass through, and the rule is that low-frequency signals can normally pass through, and high-frequency signals exceeding a set critical value are blocked and weakened.

In an embodiment of the present invention, after being filtered by a low-pass filter, a power signal and a GND signal in a power device are connected to the dc blocking differential signal obtained in step a to obtain a comprehensive differential signal, and a signal transmitting end transmits the comprehensive differential signal to a signal receiving end to complete signal transmission.

In this embodiment, a level signal of a digital audio interface is converted into a differential signal, and the differential signal is blocked by a capacitor to obtain a blocking differential signal. Therefore, under the condition of high immunity to external electromagnetic interference, the signal precision is improved, and the transmission of long-distance signals is realized based on high sensitivity to fine signals. And the power supply signal and the GND signal are subjected to low-pass filtering and then are accessed to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end. Therefore, the attenuation of normal power supply signals is reduced as much as possible, and the power supply signals are accurately and effectively transmitted.

Referring to fig. 3, the present invention provides a method for transmitting digital audio and power signals, which is applied to a signal receiving end, the method for transmitting digital audio and power signals comprising:

and step C, splitting the comprehensive differential signal after receiving the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal.

And B, after the signal receiving end receives the comprehensive differential signal sent by the differential cable in the step B, splitting the comprehensive differential signal to obtain a power signal, a GND signal and a DC blocking differential signal.

And D, transmitting the power supply signal and the GND signal to power supply receiving equipment after low-pass filtering, and finishing the transmission of the power supply signal.

And D, performing low-pass filtering on the power supply signal and the GND signal obtained in the step C, and then sending the power supply signal and the GND signal to power supply receiving equipment of a signal receiving end to supply power to the signal receiving end.

And E, restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal.

And C, after capacitance blocking is carried out on the blocking differential signal obtained in the step C, an RS422/RS485 differential signal is obtained through recovery, and the RS422/RS485 differential signal is converted into digital signals of I2S, PDM and TDM, such as CLK (Clock) signals and synchronous signals of PDM.

And F, performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

The distance is generally short when the data is transmitted in the board, the clock is sent through the signal sending end, and the data is transmitted by the signal receiving end in a mode of receiving the clock. The data transmission to the signal receiving end, namely the delay of a few ns, does not affect the whole time sequence and does not affect the data sampling of the signal sending end. However, in an embodiment of the present invention, the TTL/CMOS level is converted to the RS422/RS485 differential signal, so that the delay is increased, and meanwhile, the transmission delay of the cable during long-distance transmission and the delay of the RS422/RS485 differential to TTL/CMOS level at the signal receiving end are also increased. At this time, the total time sequence cannot meet the requirements of the transmission standards such as I2S, PDM, TDM, etc., and the time sequence needs to be adjusted to generate a time sequence meeting the requirements of the transmission standards such as I2S, TDM, and PDM, for example, by adjusting the time sequence with a pre-edited code of an FPGA (Field Programmable Gate Array) technology, or by directly adjusting the time sequence of the left and right channels.

In this embodiment, step C is equivalent to the inverse process of step B, and the integrated differential signal is split to obtain the power signal and the GND signal, and the dc blocking differential signal. Step E corresponds to the reverse of step a. And recovering the DC blocking differential signal after the DC blocking differential signal is subjected to capacitive DC blocking to obtain a differential signal, and converting the recovered differential signal into a level signal. The whole transmission process of the digital audio signal and the power signal can be regarded as that the signal is processed and assembled at a signal sending end, and is disassembled at a signal receiving end, and the TTL/CMOS level of the digital audio interface such as I2S, PDM and TDM which is mainly used for in-board or board-to-board connection is converted into an RS485/RS422 differential signal suitable for long-distance transmission in the transmission process, and the time sequence caused by each link is adjusted at the signal receiving end, so that the long-distance transmission of the digital audio such as I2S, PDM and TDM is finally completed. By changing the RS422/RS485 differential circuit, a power supply signal and a GND signal are connected to the RS422/RS485 differential signal, the power supply signal is transmitted while the RS422/RS485 differential signal is transmitted, and the digital audio signal and the power supply signal are simultaneously transmitted in a long distance.

To assist in understanding the above steps of transmitting digital audio and power signals, an explanation will now be given by taking DATA in a PDM as an example.

As shown IN fig. 4, IN step a, the PDM digital signal is sent to the RS422/RS48 sending chip as DATA IN, converted into an RS422/RS485 differential signal, and the converted RS422/RS485 differential signal is passed through a dc blocking capacitor to obtain a dc blocking differential signal.

In the step B, power input signals in the power supply device, such as +12V and GND signals, are subjected to low-pass filtering by the low-pass filter and then connected to the blocking differential signal to obtain a comprehensive differential signal, and the signal transmitting terminal transmits the comprehensive differential signal to the signal receiving terminal to complete signal transmission.

In step C, after the integrated differential signal is transmitted to the signal receiving terminal, the signal receiving terminal splits the integrated differential signal to obtain a power signal, a GND signal, and a blocking differential signal.

In step D, the power signal and the GND signal are low-pass filtered and then sent to the power receiving device, wherein the power output signal is +12V, thereby completing the transmission of the power signal.

In the step E, the blocking differential signal is subjected to capacitance blocking and then sent to an RS422/RS48 receiving chip, an RS422/RS485 differential signal is recovered, and the RS422/RS485 differential signal is converted into a digital signal of the PDM to serve as DATA OUT.

In step F, for the transmission process shown in fig. 4, the time delay of converting the PDM digital signal DATA into the RS422/RS485 differential signal in the RS422/RS48 transmitting chip, the long-distance transmission time delay in the differential cable between the signal transmitting end and the signal receiving end, and the time delay of converting the RS422/RS485 differential signal into the PDM digital signal DATA in the RS422/RS48 receiving chip, the timing of DATA OUT is adjusted to meet the timing requirement of the PDM transmission standard.

Optionally, the method of transmitting digital audio and power signals further comprises:

judging whether to transmit the digital audio signal and the power supply signal at the same time;

if the digital audio signal and the power supply signal are transmitted simultaneously, the step of converting the level signal of the digital audio interface into a differential signal is executed;

and if only the digital audio signal is transmitted and the power supply signal is not transmitted, directly sending the differential signal to a signal receiving end.

In an embodiment of the present invention, if only the digital audio signal is selected to be transmitted and the power signal is not selected to be transmitted, only the differential signal needs to be sent to the signal receiving terminal. That is to say, the signal sending terminal directly transmits the RS422/RS485 differential signal converted by the RS422/RS48 sending chip to the RS422/RS48 receiving chip of the signal receiving terminal, thereby completing the signal sending process of only transmitting the digital audio signal without transmitting the power signal.

Optionally, the step of low-pass filtering the power signal and the GND signal and then connecting to the dc blocking differential signal includes:

the power supply signal is connected to the positive end or the negative end of the blocking differential signal through low-pass filtering;

and the GND signal is connected to the negative end or the positive end of the DC blocking differential signal through low-pass filtering, and the connection of the GND signal and the power supply signal is opposite.

The power supply signal passes through the low-pass filter and then is connected to the + end or the-end of the blocking differential signal passing through the blocking capacitor, the GND signal passes through the low-pass filter and then is connected to the-end or the + end of the blocking differential signal passing through the blocking capacitor, and the GND signal access blocking differential signal is opposite to the power supply signal access blocking differential signal.

If the power supply signal passes through the low-pass filter and then is connected to the + end of the blocking differential signal passing through the blocking capacitor, the GND signal passes through the low-pass filter and then is connected to the-end of the blocking differential signal passing through the blocking capacitor, and the connection of the GND signal to the blocking differential signal is opposite to the connection of the power supply signal to the blocking differential signal, so that a loop is formed.

Optionally, the method of transmitting digital audio and power signals further comprises:

after receiving the comprehensive differential signal, judging whether the comprehensive differential signal simultaneously comprises a power supply signal, a GND signal and a DC blocking differential signal;

if the integrated differential signal comprises a power supply signal, a GND signal and a blocking differential signal, executing the step of splitting the integrated differential signal;

if only the differential signal is contained and the power supply signal is not contained, converting the received differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

In an embodiment of the present invention, if only the digital audio signal is selected to be transmitted and the power signal is not selected to be transmitted, only the differential signal needs to be received and converted into the level signal, and then the timing sequence is adjusted. That is to say, the RS422/RS48 receiving chip of the signal receiving end directly converts the received RS422/RS485 differential signal into a level signal, and then completes the timing adjustment of the delay added by the TTL/CMOS level conversion into the RS422/RS485 differential signal, the transmission delay added by the cable during long-distance transmission, and the delay added by the RS422/RS485 differential conversion into the TTL/CMOS level of the signal receiving end, thereby completing the signal receiving process of transmitting only the digital audio signal without transmitting the power signal.

Optionally, the method of transmitting digital audio and power signals further comprises:

when the digital audio signal is transmitted, the level signal of the digital audio interface is converted into a differential signal by using the differential signal transmitting chip, and the differential signal is converted into the level signal of the digital audio interface by using the differential signal receiving chip.

On hardware equipment, in order to implement the method for transmitting digital audio and power signals in the embodiments of the present invention, when a digital audio signal is transmitted, an RS422/RS485 differential signal transmitting chip is required to be used at a signal transmitting end to convert TTL/CMOS level signals of I2S, PDM, and TDM into RS422/RS485 differential signals.

Optionally, the method of transmitting digital audio and power signals further comprises:

when the power supply signal is transmitted, the low-pass filter is used for connecting the power supply signal and the GND signal to the DC blocking differential signal and sending the power supply signal and the GND signal to the power supply receiving equipment;

and converting the DC blocking differential signal into a differential signal after the capacitor DC blocking is carried out on the differential signal by using a DC blocking capacitor, and converting the DC blocking differential signal into the differential signal after the capacitor DC blocking is carried out on the DC blocking differential signal.

In hardware equipment, in order to implement the method for transmitting digital audio and power signals in the embodiment of the present invention, when transmitting a power signal, a low-pass filter is needed to be used at a signal transmitting end to connect the power signal and a GND signal to a dc blocking differential signal, and a low-pass filter is needed at a signal receiving end to send the power signal and the GND signal to power receiving equipment.

The RS422/RS485 differential signal is subjected to capacitance blocking by using a blocking capacitor and then converted into a blocking differential signal, the blocking differential signal is subjected to capacitance blocking at a signal receiving end and then converted into an RS422/RS485 differential signal, and the RS422/RS485 differential signal is converted into TTL/CMOS level signals of I2S, PDM and TDM by using an RS422/RS485 differential signal receiving chip.

In addition, the embodiment of the invention also provides a system for transmitting the digital audio and the power supply signal, the system for transmitting the digital audio and the power supply signal comprises a signal transmitting end and a signal receiving end,

converting a level signal of a digital audio interface into a differential signal at the signal transmitting end, and blocking the differential signal by a capacitor to obtain a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are connected to the blocking differential signal to obtain a comprehensive differential signal, and the comprehensive differential signal is sent to a signal receiving end;

after receiving the comprehensive differential signal, splitting the comprehensive differential signal at the signal receiving end to obtain a power signal, a GND signal and a blocking differential signal;

the power supply signal and the GND signal are subjected to low-pass filtering and then are sent to power supply receiving equipment, and transmission of the power supply signal is completed;

restoring the blocking differential signal after the blocking of the capacitor to obtain a differential signal, and converting the restored differential signal into a level signal;

and performing time sequence adjustment on the converted level signal according to the standard requirement of the digital audio interface to finish the transmission of the digital audio signal.

In addition, an embodiment of the present invention further provides an apparatus for transmitting digital audio and power signals, where the apparatus for transmitting digital audio and power signals includes: a low pass filter, a blocking capacitor, an RS422/RS48 transmitting chip, an RS422/RS48 receiving chip, a memory, a processor and a program for transmitting digital audio and power signals stored in and executable on the memory, the program for transmitting digital audio and power signals being executed by the processor to implement the steps of the method for transmitting digital audio and power signals as described above.

Furthermore, an embodiment of the present invention also provides a computer-readable storage medium having stored thereon a program for transmitting digital audio and power signals, which when executed by a processor implements the steps of the method for transmitting digital audio and power signals as described above.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

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 solution of the present invention 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) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.