WO2023087691A1

WO2023087691A1 - Audio signal output method and related device

Info

Publication number: WO2023087691A1
Application number: PCT/CN2022/099255
Authority: WO
Inventors: 杨婷华
Original assignee: 深圳市广和通无线股份有限公司
Priority date: 2021-11-16
Filing date: 2022-06-16
Publication date: 2023-05-25
Also published as: CN114257918A

Abstract

Embodiments of the present application provide an audio signal output method and a related device. The method comprises: sending a bit clock to a second chip of a third-party device by means of a first chip, the bit clock being used for initializing the second chip; and sending a digital audio signal and an analog audio signal to the second chip by means of the first chip.

Description

A method of audio signal output and related equipment

This application claims the priority of the Chinese patent application with the application number 202111357860.7 and the title of the invention "A Method for Outputting Audio Signals and Related Devices" filed with the China Patent Office on November 16, 2021, the entire contents of which are hereby incorporated by reference In this application.

technical field

The present application relates to the field of vehicle technology, and in particular to a method for outputting an audio signal and related equipment.

Background technique

With the development of economy and social progress, my country's automobile field has developed rapidly in recent years, and people have put forward further demands on automobiles. Correspondingly, the functions that automobiles need to realize have increased. Among them, automobiles are equipped with on-board equipment. , The car equipment is equipped with the first chip inside. Some functions may require the vehicle equipment to be realized with the assistance of third-party equipment (such as: Bluetooth speakers, mobile phones), such as noise reduction, echo cancellation, simultaneous output and other functions.

The vehicle-mounted device can realize the output of the analog audio signal under one audio path through the first chip. Since there are many types of third-party devices, the forms of audio signals received by third-party devices are also different, resulting in some third-party devices being unable to implement specific functions (such as noise reduction, simultaneous output, etc.) through the analog audio signal of this audio channel. ), therefore, the output form of the audio signal reduces the compatibility of the in-vehicle device with the third-party device, and reduces the functions that the third-party device can realize.

Contents of the invention

The embodiment of the present application provides a method for outputting audio signals and related equipment, which can be used in the vehicle field to realize the output of digital audio signals, improve the compatibility of vehicle equipment with third-party equipment, increase the output audio signal form of vehicle equipment, and promote The development of vehicle equipment.

In the first aspect, an embodiment of the present application provides an audio signal output method, which is applied to a vehicle-mounted device, and the method includes:

The bit clock is sent to the second chip of the third-party device through the first chip, and the bit clock is used to initialize the second chip. The third-party device is an audio playback device independent of the vehicle-mounted device, and the second chip is used to initialize the second chip. The chip is an audio signal processing chip of a third-party device;

The digital audio signal and the analog audio signal are sent to the second chip through the first chip.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the bit clock is used to supply power to the second chip.

With reference to the first aspect or the first possible implementation of the first aspect, in the second possible implementation of the first aspect, after the vehicle-mounted device sends the bit clock to the second chip through the first chip, it further includes : Shielding the first software code, the first software code is used to turn off the bit clock.

With reference to the first aspect or the first possible implementation of the first aspect, in the third possible implementation of the first aspect, before sending the bit clock to the second chip through the first chip, the method further includes:

The receiving startup information through the first chip, wherein the startup information is used to indicate that the third-party device has been started.

With reference to the first aspect or the first possible implementation of the first aspect, in a fourth possible implementation of the first aspect, sending the digital audio signal and the analog audio signal to the second chip through the first chip, include:

Encapsulating the digital audio signal and the analog audio signal into a synthetic audio signal of an audio path through the first chip;

sending the synthesized audio signal to the second chip of the third-party device through the first chip.

With reference to the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, there are four audio channels in the vehicle-mounted device, wherein one audio channel is used for inputting audio signals, and two audio channels are used for inputting audio signals. One channel is used for Bluetooth transmission, and one is used for outputting the synthesized audio signal.

With reference to the first aspect or the first possible implementation manner of the first aspect, the first chip is configured with a digital audio signal output module, the digital audio signal output module is used for the first chip to output a digital audio signal, and the digital The audio signal output module is equipped with a control link control;

The control link is used for data transmission between a port of a central processing unit (Central Processing Unit, CPU) and a port of a codec codec, wherein the codec is used for mutual conversion of digital audio signals and analog audio signals, The codec is used to provide digital audio signals for the digital audio output module.

Wherein, in terms of the specific configuration of the digital audio signal output module, the digital audio signal output module is not only configured with a control link control, but also configured with a path route and a control interface dai link, and the digital audio signal output module is used for the first The chip outputs digital audio signal;

The control link is used for data transmission between the port of the CPU and the port of the codec, wherein the codec is used for mutual conversion between digital audio signals and analog audio signals, and the codec is used for digital audio output The module provides digital audio signal;

The port of the CPU includes multiple data transmission interfaces, the port of the codec includes multiple data transmission interfaces, and the path is used to represent the multiple data transmission interfaces of the CPU port and the multiple data transmission interfaces of the codec port. Connection relationship between data transmission interfaces;

The control interface is used to characterize the connection relationship between the first data transmission interface among the multiple data transmission interfaces of the CPU and the second data transmission interface among the multiple data transmission interfaces of the codec; the first data transmission interface is the Any one of the multiple data transmission interfaces of the CPU and/or the codec; the second data transmission interface is any one of the multiple data transmission interfaces of the CPU and/or the codec, Digital audio signals are transmitted through the configured control interface.

In a second aspect, an embodiment of the present application provides a vehicle-mounted device, including a first chip, a memory, and a communication interface, wherein the memory is used to store a computer program, and the first chip is used to call the computer program, Do the following:

Send a bit clock to the second chip of the third-party device through the communication interface, the bit clock is used to initialize the second chip, the third-party device is an audio playback device independent of the vehicle-mounted device, the first The second chip is an audio signal processing chip of a third-party device;

sending digital audio signals and analog audio signals to the second chip through the communication interface.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the bit clock described in this application is used to supply power to the second chip.

With reference to the second aspect or the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the first chip is further configured to shield the first software code, and the first Software code is used to turn off the bit clock.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the first chip is further configured to receive startup information through the communication interface, where, The startup information is used to indicate that the third-party device has been started.

With reference to the second aspect or the first possible implementation of the second aspect, in a fourth possible implementation of the second aspect, after sending a digital audio signal and an analog audio signal to the second chip through the communication interface In terms of signals, the first chip is specifically used for:

A synthetic audio signal that encapsulates digital audio signals and analog audio signals into one audio path;

sending the synthesized audio signal to the second chip of the third-party device through the communication interface.

With reference to the fourth possible implementation of the second aspect, in the fifth possible implementation of the second aspect, there are four audio channels in the vehicle-mounted device, wherein one audio channel is used for inputting audio signals, and two audio channels are used for inputting audio signals. One channel is used for Bluetooth transmission, and one is used for outputting the synthesized audio signal.

With reference to the second aspect or the first possible implementation of the second aspect, in a sixth possible implementation of the second aspect, the first chip is configured with a digital audio signal output module, and the digital audio signal output The module is used for the first chip to output a digital audio signal, and the digital audio signal output module is configured with a control link control; the control link is used for data transmission between the port of the CPU and the port of the codec, wherein , the codec is used for mutual conversion between the digital audio signal and the analog audio signal, and the codec is used for providing the digital audio signal to the digital audio output module.

The control link is used for data transmission between the port of the CPU and the port of the codec, wherein the codec is used for mutual conversion between digital audio signals and analog audio signals, and the codec is used for digital audio output modules Provide digital audio signals;

The control interface is used to characterize the connection relationship between the first data transmission interface among the multiple data transmission interfaces of the CPU and the second data transmission interface among the multiple data transmission interfaces of the codec; the first data transmission interface is Any one of the multiple data transmission interfaces of the CPU and/or the codec; the second data transmission interface is any one of the multiple data transmission interfaces of the CPU and/or the codec interface, the digital audio signal will be transmitted through the configured control interface.

In a third aspect, an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium is used to store a computer program, and when the computer program is run on a processor, the first aspect or the first aspect is implemented Any possible implementation of the described method.

In a fourth aspect, an embodiment of the present application provides a computer program product, which is characterized in that when the computer program product runs on a processor, it implements the method described in the first aspect or any possible implementation manner of the first aspect.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings that are used in the embodiments.

FIG. 1 is a schematic diagram of a scene of an audio signal output system provided by an embodiment of the present application;

Fig. 2 is a schematic flow chart of a digital audio signal output method provided by an embodiment of the present application;

FIG. 3 is a schematic configuration diagram of a digital audio signal output module path provided by an embodiment of the present application;

FIG. 4 is a schematic configuration diagram of a control interface of a digital audio signal output module provided in an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a vehicle-mounted device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of multiple other features, integers, steps, operations, elements, components and/or collections thereof.

It should also be understood that the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural referents unless the context clearly dictates otherwise.

It should be further understood that the term "and/or" used in the description of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations .

As used in this specification and the appended claims, the term "if" may be construed, depending on the context, as "when" or "once" or "in response to determining" or "in response to detecting ". Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be construed, depending on the context, to mean "once determined" or "in response to the determination" or "once detected [the described condition or event] ]” or “in response to detection of [described condition or event]”.

Referring to FIG. 1 , it is a schematic diagram of a scene of an audio signal output system provided by an embodiment of the present application. The audio signal output system includes a vehicle-mounted device 101 and a third-party device 102, wherein the vehicle-mounted device 101 includes a first chip 103, and the third-party Device 102 includes a second chip 104 . The audio signal output system is specifically applied to the vehicle field.

The vehicle-mounted device 101 is a device with signal transmission function and signal processing function, such as: a vehicle-mounted tablet, a vehicle-mounted host, and the like. The in-vehicle device 101 can implement the output of digital audio signals and the output of analog audio signals through the first chip 103 .

The third-party device 102 is a device with signal transmission function and signal processing function, such as: bluetooth speaker, earphone, mobile phone, computer, tablet and so on. The third-party device 102 can receive and process audio signals through the second chip 104 . The third-party device 102 may send startup information to the vehicle-mounted device 101 when it is started, and the startup information is used to indicate that the third-party device 102 has been started.

The first chip 103 is a chip with signal transmission function and signal processing function. The vehicle-mounted device 101 sends a bit clock to the second chip 104 of the third-party device 103 through the first chip 102, and the bit clock is used to initialize the second chip 104. , and the bit clock can also be used to power the second chip 104 . Alternatively, the vehicle-mounted device 101 may receive the startup information of the third device 102 through the first chip 103 , and send a bit clock to the second chip 104 of the third-party device 102 when the vehicle-mounted device 101 receives the startup information.

Wherein, the third-party device 102 is an electronic device independent of the car and the vehicle-mounted device, and the activation of the third-party device 102 may not be related to the activation of the vehicle-mounted device 101 . Therefore, in order to avoid that the vehicle-mounted device 101 repeatedly transmits the bit clock when the third-party device 102 is turned off, resulting in waste of energy, the vehicle-mounted device 101 adds a start condition for the bit clock, that is: receiving the start-up condition of the third-party device 102 information.

In a conventional Bluetooth call application scenario, the vehicle-mounted device 101 has four audio channels, wherein one audio channel is used for inputting audio signals, two audio channels are used for Bluetooth transmission, and one audio channel is used for outputting analog audio signals. In this application, the audio path for outputting analog audio signals needs to be able to output both analog audio signals and digital audio signals. The vehicle-mounted device 101 can package the digital audio signal and the analog audio signal into a composite audio signal of an audio path through the first chip 103, and the vehicle-mounted device 101 sends the composite audio signal to the second chip 104 of the third-party device 102 through the first chip 103 Signal.

In the embodiment of the present application, the first chip 103 is configured with a digital audio signal output module, the digital audio signal output module is used for the first chip 103 to output a digital audio signal, and the digital audio signal output module is configured with a control link control; wherein the control link is used for data transmission between the port of the CPU of the first chip and the port of the codec codec of the first chip, wherein the codec is used for digital audio signals and analog The audio signals are mutually converted to provide digital audio signals for the digital audio output module.

The second chip 104 is a chip with signal transceiving function and signal processing function, more specifically, it may be a DSP chip, or a chip in other forms. The third-party device 102 realizes receiving and outputting audio signals through the second chip 104.

The third-party device 102 receives the bit clock sent by the vehicle-mounted device 101 through the first chip 103 through the second chip 104 . The bit clock is used to initialize the second chip 104 , and the bit clock can also be used to power the second chip 104 .

Wherein, the power supply of the second chip 104 by the bit clock can reduce the power consumption of the third-party device 102 by the second chip 104, improve the usage time of the third-party device 102, and the power supply of the second chip 104 by the bit clock can be passed The transmission time of the bit clock is controlled, and the working time of the second chip 104 is further controlled, so as to control the second chip 104 .

The third-party device 102 receives the digital audio signal and the analog audio signal sent by the vehicle-mounted device 101 through the first chip 103 through the second chip 104 .

Referring to FIG. 2 , FIG. 2 is a schematic flowchart of an audio signal output method provided by an embodiment of the present application. The method can be implemented based on the audio signal output system shown in Figure 1, and the method includes but is not limited to the following operations:

S201: The vehicle-mounted device sends a bit clock to a third-party device through the first chip.

Wherein, the vehicle-mounted device is configured with a first chip, and the first chip controls signal processing and signal sending and receiving of the vehicle-mounted device. In addition, there will also be a built-in DSP chip inside the first chip of the vehicle-mounted device, and the built-in DSP chip of the vehicle-mounted device will process digital audio signals and analog audio signals generated inside the electronic device. The third-party device needs to process the input signal, and depending on the type of the third-party device, the required input signal may be different. In some cases, the type of the third-party device is determined by the type of chip carried inside the third-party device. The type of chip carried inside the third-party device may specifically be a DSP chip, and the third-party device may be an electronic device that is independent of the vehicle-mounted device and can work together with the vehicle-mounted device, such as earphones, mobile phones, tablets, and Bluetooth speakers. The third-party device is equipped with a chip inside, and the chip may be a DSP chip. Third-party devices can use the DSP chip to receive digital audio signals, and process the received digital audio signals accordingly to achieve functions such as noise reduction and noise cancellation. For the convenience of subsequent descriptions, we will use the internal The chips are collectively referred to as the second chip.

The first chip can be connected to a third-party device through a hardware channel, and the hardware channel includes a plurality of audio channels. Correspondingly, the first chip may also be connected with a third-party device through a wireless communication link based on a wireless communication protocol. The wireless communication protocol includes but not limited to Bluetooth communication protocol, Zig-Bee communication protocol, and the wireless communication link includes multiple audio channels. The first chip has its own internal clock, the first chip can generate a bit clock through the internal clock, and the first chip can also generate a bit clock in other ways, when the bit clock exists in the form of a digital audio signal , the specific expression form of the bit clock can be specifically a square wave, and the vehicle-mounted device sends the bit clock to the second chip of the third-party device through the communication link through the first chip. The second chip receives a bit clock for initialization.

During the initialization process, the bit clock can adjust the time standard of the second chip, so that the clocks of the second chip and the first chip are consistent, so as to facilitate signal transmission. Under the condition that the second chip receives the bit clock signal, the second chip performs an initialization operation. For example, for some types of second chips, the specific form of the initialization can be: execute the corresponding function to realize port id Clock enable for AFE_PORT_ID_QUINARY_RX.

The bit clock can supply power to the second chip, thereby ensuring that the second chip can work normally. Wherein, the power supply mode that the bit clock supplies power to the second chip can reduce the power consumption of the second chip to the third-party device, improve the use time of the third-party device, and the bit clock supplies power to the second chip, so that it can Control the working state of the second chip. Therefore, the on-vehicle device can control the transmission of the bit clock, and then control the working state of the second chip, thus playing the role of controlling the second chip. For example: the vehicle-mounted device sends the bit clock to the second chip through the first chip at a low level, or stops sending the bit clock to the second chip, so as to achieve the purpose of stopping the work of the second chip.

Among them, the solutions for the vehicle-mounted device to send the bit clock through the first chip include but are not limited to the following three types:

plan 1:

When the vehicle-mounted device is started, the vehicle-mounted device sends a bit clock through the first chip. This scheme has been widely used in the debugging process of vehicle equipment.

Scenario 2:

When the third device is activated, the third device sends connection request information to the vehicle-mounted device, and the vehicle-mounted device receives the connection request information, where the connection request information is used to indicate that the third-party device requests connection. The on-vehicle device sends the bit clock to the second chip carried by the third-party device through the first chip, and the second chip performs initialization when receiving the bit clock.

For example: when the mobile phone (third-party device) is activated, the mobile phone sends request connection information to the vehicle-mounted device in response to user operations, and the request connection information is used to indicate that the mobile phone requests to be connected to the first chip of the vehicle-mounted device. The device receives the request connection information of the mobile phone through the first chip, and sends a bit clock to the DSP chip (second chip) on the mobile phone, and the DSP chip initializes when receiving the bit clock.

Option 3:

In solution 3, the connection request information in solution 2 above is specifically the activation information of the third-party device. Therefore, solution 3 specifically includes: when the third-party device is started, the third-party device sends start-up information to the vehicle-mounted device, and the start-up information is used to indicate that the third-party device has been started. After receiving the startup information, the vehicle-mounted device can know that the third-party device has started according to the startup information, so the vehicle-mounted device sends the bit clock to the second chip carried by the third-party device through the first chip, and the second chip receives In the case of the bit clock, initialization is performed.

For example: when a Bluetooth headset (third-party device) is started, the Bluetooth headset sends startup information to the vehicle-mounted device, and the startup information is used to indicate that the Bluetooth headset has been started. When the in-vehicle device receives the activation information, the in-vehicle device sends a bit clock to the DSP chip (second chip) mounted on the Bluetooth headset, and the second chip performs initialization when receiving the bit clock.

The

above schemes

2 and 3 provide two kinds of third-party devices that exist in daily life. A third-party device such as a mobile phone. When the third-party device is started, it receives external operations and sends request connection information to the vehicle-mounted device. The action initiated by the third-party device has nothing to do with the connection request information sent by the third-party device. For example, the Bluetooth speaker, when the third-party device is started, sends the start-up information to the third-party device. In order to avoid the waste of energy caused by repeated transmission of the bit clock by the vehicle-mounted device when the third-party device is turned off, the vehicle-mounted device adds a start-up condition for the bit clock, that is: receiving the start-up information of the third-party device and/or receiving Request connection information for third-party devices.

S202: The vehicle-mounted device shields the first software code through the first chip.

Wherein, the first software code is used to turn off the bit clock. In order to ensure that the second chip can work normally, the second chip needs to receive the bit clock sent from the vehicle-mounted device, which is used to supply power to the second chip. Therefore, when the second chip is working, when the vehicle-mounted device stops sending The bit clock sent by the second chip will cause the second chip to lose its energy source and destroy the working state of the second chip. Therefore, when the vehicle-mounted device sends a bit clock to a third-party device, it is necessary to shield the first software code. When running to the first software code, the software code is skipped, avoiding the shutdown of the bit clock, so that the bit clock remains on, thereby ensuring the working state of the second chip.

S203: The vehicle-mounted device sends the digital audio signal and the analog audio signal to the second chip through the first chip.

Due to the different types of third-party devices, some third-party devices support the input of analog audio signals, and some third-party devices support the input of digital audio signals. Therefore, after the vehicle-mounted device is connected to the third-party device through the first chip, the The first chip judges the audio signal format required by the third-party device according to the architecture and supported protocols of the third-party device, and outputs the corresponding audio signal format. In the case that the signal type supported by the third-party device is a digital audio signal, the vehicle-mounted device outputs the digital audio signal to the second chip of the third-party device through the first chip.

Correspondingly, in some possible implementations, the on-vehicle device outputs analog audio signals and digital audio signals to the second chip through the first chip, such as: Bluetooth call scenarios, Bluetooth audio playback scenarios, etc., the following for Bluetooth scenarios The situation where both analog audio signals and digital audio signals are output will be introduced.

For example: in the scenario of Bluetooth playback, when the vehicle-mounted device is connected to a third-party device, the vehicle-mounted device will use the first chip to judge the audio signal format required by the third-party device according to the structure and supported protocols of the third-party device. The three-party device needs digital audio signals and analog audio signals, so the vehicle-mounted device sends digital audio signals and analog audio signals to the Bluetooth speaker through the first chip, and the vehicle-mounted device may also send analog audio signals to another third-party device through the audio channel. Audio signal and/or analog audio signal to achieve simultaneous playback of multiple third-party devices.

In this method, the digital audio signal and the analog audio signal output by the vehicle-mounted device through the first chip are different in form, but at the same time node, the digital audio signal and the analog audio signal output by the vehicle-mounted device through the first chip The content of the audio signal is the same. As in the above audio playing process, within the same time period, both the analog audio signal and the digital audio signal output by the vehicle-mounted device through the first chip can enable the third-party device to play the same audio segment.

In the scenario of a Bluetooth call: the vehicle-mounted device is connected to a third-party device through the Bluetooth module of the vehicle-mounted device. The digital audio signal is analyzed and then output through the sound generating device; the vehicle-mounted device collects the sound through the sound collecting device, and sends the digital audio signal and the analog audio signal to the third-party device through the first chip.

Among them, during a normal Bluetooth call, there are four audio channels working, one of which is used for inputting audio signals, one is used for outputting analog audio signals, and two are used for Bluetooth transmission. In the embodiment of the present application, it is required that the first chip can output digital audio signals and analog audio signals, so five audio channels are required. However, due to the limitation of the hardware architecture of the first chip, the first chip cannot logically transmit data through the five-way audio channel. Therefore, in the embodiment of the application, the vehicle-mounted device can convert the output of the five-way audio channel into Four-way audio channel output, the specific execution method is as follows:

Configure a signal synthesis module on the second DSP chip on the first chip, under the situation that this first chip needs to transmit digital audio signal and analog audio signal, this signal synthesis module will carry out to this digital audio signal and analog audio signal Processing and calculation, the digital audio signal and the analog audio signal are packaged into a synthetic audio signal, and then the first chip transmits the synthetic audio signal to the Bluetooth module of the vehicle equipment through an audio channel, during which the digital audio signal and The analog audio signals are not actually combined, so there is no need to analyze and separate them in the subsequent transmission process. Thus, five audio channel outputs are converted into four audio channel outputs on the first chip. Adopting the audio signal transmission method can solve the limitation of audio signal transmission caused by the hardware architecture, and realize the requirements of the second chip of the third device for multiple audio signal forms.

It is worth noting that since the first chip of the vehicle-mounted device can only output one analog audio signal before the filing of this application, in order to enable the first chip to output digital audio signals, the first chip has been improved accordingly, including but Not limited to: modification of software code, technical support of logic front-end and change and addition of controls on hardware, technical support of physical back-end, the first chip specifically adds a digital audio signal output module.

Wherein, in terms of the specific configuration of the digital audio signal output module, the digital audio signal output module is configured with a control link control, a path route, and a control interface dai link, and the digital audio signal output module is used for the first chip to output digital audio Signal.

The control link is used for data transmission between the port of the CPU and the port of the codec, wherein the codec is used for mutual conversion between digital audio signals and analog audio signals, and the codec is used for digital audio output The module provides digital audio signals.

The port of the CPU includes multiple data transmission interfaces, the port of the codec includes multiple data transmission interfaces, and the path is used to represent the multiple data transmission interfaces of the CPU port and the multiple data transmission interfaces of the codec port. A connection relationship between data transmission interfaces, and a data transmission interface may be connected to multiple data transmission interfaces on a path.

For example: the CPU port includes one or more analog output signal interfaces, Bclk signal interface, ground signal interface, reset signal interface, the codec port includes IIR interface, DEC interface, etc., to set the path of the digital audio signal output module, you can connect the CPU The multiple data transmission interfaces of the codec are connected to the multiple data transmission interfaces of the codec, and the data transmission interfaces of the CPU can be connected to the data transmission interfaces of the CPU, and the codec interface can be connected to the codec interface.

Referring to FIG. 3 , FIG. 3 is a schematic configuration diagram of a control link of a digital audio signal output module 30 provided in the present application. The digital audio output module includes a CPU port 301 and a codec port 302 . Wherein, the CPU port includes: interface 1, interface 2, and interface 3, and the codec port includes: interface A, interface B, interface C, and interface D. Configure the path of the digital audio signal output module so that port 1 is connected to port A, port 1 is connected to port C, port 2 is connected to port A, port 2 is connected to port C, port 3 is connected to port D, and port A is connected to port B is connected, interface B is connected to interface C, and interface C is connected to interface D. The connection of multiple audio signal interfaces shown in Figure 3 is the connection at the path level, indicating the possible transmission direction of the digital audio signal. The specific digital audio signal The determination of the transmission direction requires further configuration of the control interface. And the connection of the above-mentioned multiple interfaces can be realized through one-time path configuration.

For example: the CPU port includes an analog output interface, the codec port includes an analog input port, and the control interface of the digital audio signal output module is set to connect the analog output interface to the analog input interface.

Referring to Fig. 4, Fig. 4 is a schematic configuration diagram of a control interface of a digital audio signal output module provided by an embodiment of the present application, wherein Fig. 4 is the path based on the configuration in Fig. 3 for the digital audio signal output module shown in Fig. 3 Control interface configuration. Interface 1 is connected to interface A, interface 2 is connected to interface C, interface 3 is connected to interface D, interface A is connected to interface B, interface B is connected to interface C, and the connection of the audio signal interface described in Figure 4 is at the control interface level Connection, which indicates that the digital audio signal is transmitted through the path of the connection. Only when the two data transmission interfaces are connected on the path, can the two data transmission interfaces be connected with the control interface.

Since there are many types of third-party devices, and different types of third-party devices support different protocols, the signal requirements received by different types of third-party devices will also be different. Therefore, this application improves the problem of the single output audio signal of the vehicle-mounted equipment. Using this application, the vehicle-mounted equipment can output digital audio signals, thereby increasing the number and types of third-party equipment that the vehicle-mounted equipment can support. For example: third-party devices include different types of electronic devices such as earphones, mobile phones, tablets, and Bluetooth speakers. Wherein, when the third-party device is a Bluetooth speaker, the vehicle-mounted device needs to output an analog audio signal to the DSP chip of the Bluetooth speaker. Audio output, but when the third-party device is a noise-cancelling headset, the third-party device can output analog signals and digital signals to the DSP chip of the noise-canceling headset to achieve the noise-cancelling function. The DSP chip of the noise-canceling headset Both the DSP chip and the Bluetooth speaker can process audio signals, but the specific structure is different, and the types of audio signals processed are different. Moreover, the structure of the DSP chip of the bluetooth speaker may change so that the bluetooth speaker supports the input of analog signals. Therefore, it is necessary to add a digital audio signal output module, so as to meet the requirements of various audio signal forms of the third-party equipment, so that the third-party equipment can realize more functions.

Referring to FIG. 5 , FIG. 5 is a schematic structural diagram of a vehicle-mounted device 40 provided in an embodiment of the present application. The vehicle-mounted device may specifically be the audio signal output system in FIG. 1 , or a module in the audio signal output system. Wherein, the vehicle-mounted device 40 includes a first chip 401 , a memory 402 , and a communication interface 403 . The first chip 401 includes a digital audio signal output module 404, wherein the detailed description of each component is as follows.

The first chip 401 is a chip with signal transmission function and signal processing function. The first chip 401 can be a CPU, and the chip can also be other general-purpose processors, DSP, application specific integrated circuits (Application Specific Integrated Circuit, ASIC) ), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

The memory 402 may include read-only memory and random-access memory, and provides instructions and data to the processor 401 . A portion of memory 402 may also include non-volatile random access memory. For example, memory 402 may also store device type information.

Wherein, the communication interface 403 can be a communication interface of a wireless module such as a communication interface of a Bluetooth module or a communication interface of a WIFI module, or a wired communication interface connected to a data line such as an earphone jack, and the communication interface 403 may be integrated in The inside of the first chip 401 may also be outside the first chip 401. When the communication interface 403 is inside the first chip, the communication interface 403 may be connected with the digital audio signal output module 404 and/or with the digital signal output Module 404 is integrated in the same module.

The memory 402 is used to store a computer program, and the first chip 401 is used to call the computer program to perform the following operations:

Send a bit clock to a second chip of a third-party device through the communication interface 403, the bit clock is used to initialize the second chip, the third-party device is an audio playback device independent of the vehicle-mounted device, the The second chip is an audio signal processing chip of a third-party device;

The digital audio signal and the analog audio signal are sent to the second chip through the communication interface 403 .

Wherein, the third-party device is configured with the second chip, and the third-party device includes but is not limited to: a mobile phone and a Bluetooth speaker. The first chip 401 may be connected to a third-party device through a hardware channel, and the hardware channel includes a plurality of audio channels. Correspondingly, the first chip 401 may also be connected with a third-party device through a wireless communication link based on a wireless communication protocol. The wireless communication protocol includes but not limited to Bluetooth communication protocol, Zig-Bee communication protocol, and the wireless communication link includes multiple audio channels. The first chip 401 has its own internal clock. The first chip 401 can generate a bit clock through the internal clock, and can also generate a bit clock in other ways. When the bit clock exists in the form of a digital audio signal, the bit clock The specific expression form may specifically be a square wave, and the vehicle-mounted device 40 sends the bit clock to the second chip of the third-party device through the first chip 401 through a communication link. The second chip receives a bit clock for initialization. During the initialization process, the bit clock can adjust the time standard of the second chip, so that the clocks of the second chip and the first chip 401 are consistent, so as to facilitate signal transmission.

Based on the output method of the audio signal in the first aspect, the output of the digital audio signal can be realized. Since the third-party equipment needs the digital audio signal, this solution meets the requirements of the third-party equipment for the digital audio signal and improves the compatibility of the vehicle-mounted equipment 40. Correspondingly, the diversity of third-party devices is improved, so that the vehicle-mounted device 40 can realize more functions based on the third-party devices and improve user experience.

In a possible implementation manner, the bit clock described in this application is used to supply power to the second chip.

Wherein, the power supply of the second chip by the bit clock can reduce the power consumption of the second chip to the third-party equipment, improve the usage time of the third-party equipment, and the power supply of the second chip by the bit clock can control the emission of the bit clock time, and further control the working time of the second chip, thus playing the role of controlling the second chip.

In yet another possible implementation manner, the first chip 401 is further configured to shield a first software code, and the first software code is used to disable the bit clock.

In order to ensure that the second chip can work normally, the second chip needs to receive the bit clock sent from the vehicle-mounted device 40, which is used to supply power to the second chip, so when the second chip works, when the vehicle-mounted device 40 stops Sending the bit clock to the first chip 401 will cause the second chip to lose its energy source and destroy the work flow of the second chip. Therefore, after the vehicle-mounted device 40 sends the bit clock to the third-party device, it is necessary to shield the first software code. When a chip 401 runs to the first software code, the software code is skipped so that the bit clock remains on, thereby ensuring the working state of the second chip.

In yet another possible implementation manner, the first chip 401 is further configured to receive startup information through the communication interface 403, where the startup information is used to indicate that the third-party device has been started.

Wherein, the third-party device starts and sends start-up information to the vehicle-mounted device 40. When the vehicle-mounted device 40 receives the start-up information through the first chip 401, the vehicle-mounted device 40 sends a bit clock to the second chip of the third-party device. The clock is used to initialize the second chip. At the same time, the activation information can be sent to the vehicle-mounted device 40 through a wireless link or a wired link. The vehicle-mounted device 40 is a device associated with the car. When the car is started, the vehicle-mounted device 40 will start. However, the third-party device is an electronic device independent of the car and the vehicle-mounted device 40. The startup of the third-party device can be related to The start of the vehicle-mounted device 40 is irrelevant, for example: we start the Bluetooth speaker and connect the Bluetooth speaker with the vehicle-mounted device 40 while the car is running. The time to start the Bluetooth speaker is not directly related to the time to start the car, but the vehicle-mounted device 40 needs to be started when the car is started. Therefore, in order to avoid that the vehicle-mounted device 40 repeatedly transmits the bit clock when the third-party device is turned off, resulting in waste of energy, the vehicle-mounted device 40 adds a bit clock activation condition, that is, receiving the activation information of the third-party device.

In yet another possible implementation manner, in terms of sending digital audio signals and analog audio signals to the second chip through the communication interface 403, the first chip 401 is specifically configured to:

Send the synthesized audio signal to the second chip of the third-party device through the communication interface 403 .

Wherein, due to the limitation of the internal hardware architecture of the first chip 401, the first chip 401 may not support the output of digital audio signals and analog audio signals by using two audio channels respectively. The first chip 401 can only provide one audio channel for outputting audio signals. Therefore, it is necessary to synthesize the digital audio signal and the analog audio signal, and send the synthesized signal through an audio channel, so as to solve the limitation of audio signal transmission caused by the hardware architecture, and realize the requirement of the second chip for multiple audio signal forms.

In yet another possible implementation manner, there are four audio paths in the vehicle-mounted device 40, wherein one audio path is used for inputting audio signals, two audio paths are used for Bluetooth transmission, and one is used for outputting the synthesized audio signal.

In the scenario of a Bluetooth call, data transmission is performed between the vehicle-mounted device 40 and the third-party device through four communication links. Due to the limitation of the DSP chip inside the first chip 401, the four communication links cannot be expanded into five communication links. Therefore, it is necessary to use the method described in the third possible implementation manner of the second aspect to synthesize the digital audio signal and the analog audio signal, so as to realize the Bluetooth call function.

In yet another possible implementation manner, the first chip 401 is configured with a digital audio signal output module 404, and the digital audio signal output module 404 is used for the first chip 401 to output a digital audio signal, through which the digital audio signal output module The digital audio signal is sent to the communication interface 403 . The digital audio signal output module 404 is configured with a control link control; the control link is used for data transmission between the port of the CPU and the port of the codec codec, wherein the codec is used for digital audio signals and The analog audio signals are mutually converted, and the codec is used to provide digital audio signals for the digital audio output module.

Regarding the specific configuration of the digital audio signal output module 404, the digital audio signal output module 404 is not only configured with a control link control, but also configured with a path route and a control interface dai link, and the digital audio signal output module 404 is used for the first A chip 401 outputs digital audio signals;

Through the above configuration, hardware and software support can be provided for the digital audio signal output module to meet the requirement of the vehicle-mounted device 40 to output digital audio signals through the first chip 401 .

The embodiment of the present application also provides a computer-readable storage medium, where computer instructions are stored in the above-mentioned computer-readable storage medium, and when the above-mentioned computer-readable storage medium is run on a processor, the implementation in the embodiment shown in FIG. 1 is realized. The operation performed by the digital audio signal output system.

An embodiment of the present application further provides a computer program product. When the above computer program product runs on a processor, the operations performed by the digital audio signal output system in the embodiment shown in FIG. 1 are realized. Those skilled in the art will understand that the present application may employ computer programs implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The form of the product. For example, application programs (applications, APP), plug-ins, etc. for business matching.

Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the audio signal output system and the vehicle-mounted device described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed audio signal output system and vehicle-mounted equipment can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present application.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium In, several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The above is only a specific embodiment of the application, but the scope of protection of the application is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the scope of the technology disclosed in the application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

An audio signal output method, characterized in that it is applied to a vehicle-mounted device, comprising:

The bit clock is sent to the second chip of the third-party device through the first chip, and the bit clock is used to initialize the second chip. The third-party device is an audio playback device independent of the vehicle-mounted device, and the second chip is used to initialize the second chip. The chip is an audio signal processing chip of a third-party device;

The digital audio signal and the analog audio signal are sent to the second chip through the first chip.
The method of claim 1, wherein the bit clock is used to power the second chip.
The method according to claim 1 or 2, characterized in that, after sending the bit clock to the second chip of the third-party device through the first chip, further comprising:

Masking the first software code, the first software code is used to turn off the bit clock.
The method according to claim 1 or 2, wherein before sending the bit clock to the second chip of the third-party device through the first chip, further comprising:

The receiving startup information through the first chip, wherein the startup information is used to indicate that the third-party device has been started.
The method according to claim 1 or 2, wherein the sending a digital audio signal and an analog audio signal to the second chip through the first chip comprises:

packaging the digital audio signal and the analog audio signal into a synthetic audio signal of an audio path through the first chip;

sending the synthesized audio signal to the second chip through the first chip.
The method according to claim 5, wherein there are four audio paths in the vehicle-mounted device, wherein one audio path is used for inputting audio signals, two audio paths are used for Bluetooth transmission, and one audio path is used for outputting the synthesized audio Signal.
The method according to any one of claims 1 or 2, wherein the first chip is configured with a digital audio signal output module, and the digital audio signal output module is used for the first chip to output the digital audio signal, the digital audio signal output module is configured with a control link control; wherein the control link is used to connect the port of the central processing unit CPU of the first chip to the codec of the codec of the first chip Data transmission between ports, wherein the codec is used for mutual conversion between digital audio signals and analog audio signals, so as to provide digital audio signals for the digital audio output module.
A vehicle-mounted device, characterized in that it includes a first chip, a memory, and a communication interface, wherein the memory is used to store a computer program, and the first chip is used to call the computer program to perform the following operations:

Send a bit clock to the second chip of the third-party device through the communication interface, the bit clock is used to initialize the second chip, the second chip is an audio signal processing chip of the third-party device, and the second chip Audio signal processing chips for third-party equipment;

sending digital audio signals and analog audio signals to the second chip through the communication interface.
The vehicle-mounted device according to claim 8, wherein the first chip is further used to shield a first software code, and the first software code is used to turn off the bit clock.
A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program, and when the computer program is run on a processor, the method according to any one of claims 1-6 is implemented .