Vehicle-mounted virtual multi-channel audio signal processing method, system, and electronic device

Abstract

The present invention belongs to the field of automobiles, and provides an in-vehicle virtual multi-channel audio signal processing method, system, and electronic device. The processing method includes the steps of obtaining an audio input signal of a single audio channel, identifying different frequency band components in the audio input signal, allocating audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components, performing digital signal processing of corresponding frequency bands on the audio data in the different signal chains to obtain single channel signals of multiple different frequency bands, and superimposing and outputting the multiple single channel signals on a single channel audio output signal. The present invention can perform digital signal processing in different frequency bands for different speakers connected in parallel to a single audio channel, which not only improves the sound quality of the entire vehicle, but also reduces the cost of the vehicle.

Description

[Technical field]

[0001] The present invention relates to the technical field of automobiles, and in particular to an in-vehicle virtual multi-channel audio signal processing method, system, and electronic device. [Background technology]

[0002] With the rapid development of smart car technology, audio systems, as an important part of vehicle entertainment systems, provide passengers with an essential sound experience. Theoretically, the more speakers a vehicle audio system has, the more output channels of the audio power amplifiers will be, and the better the overall sound quality will be. The most ideal vehicle audio system structure is one in which each speaker is controlled by an independent audio power amplifier channel.

[0003] However, in practice, in order to reduce vehicle costs, the number of speakers in a vehicle is greater than the number of output channels of an audio power amplifier, and multiple different speakers must be connected to one output channel of an audio power amplifier. In this case, only the same digital signal processing can be performed, which causes a problem of degraded sound quality throughout the vehicle.

[0004] Therefore, there is a need to provide an in-vehicle virtual multi-channel audio signal processing method, system, and electronic device to solve the above technical problems. Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to provide an in-vehicle virtual multi-channel audio signal processing method, system and electronic device to solve the problem that only the same digital signal processing can be performed for multiple different speakers on the output channels of a conventional automotive audio power amplifier, resulting in a deterioration in vehicle sound quality. [Means for solving the problem]

[0006] (First viewpoint) The present invention provides an in-vehicle virtual multi-channel audio signal processing method, which includes the steps of obtaining an audio input signal of a single audio channel, identifying different frequency band components in the audio input signal, allocating audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components, performing digital signal processing of corresponding frequency bands on the audio data in the different signal chains to obtain single channel signals of multiple different frequency bands, and superimposing the multiple single channel signals on a single channel audio output signal and outputting it.

[0007] Preferably, the audio input signal is an analogue or digital signal.

[0008] Preferably, the frequency band components of the audio input signal include a low frequency band component, a mid frequency band component and a high frequency band component.

[0009] Preferably, before performing the step of identifying different frequency band components in the audio input signal, pre-processing is performed on the audio input signal, the pre-processing including digital / analog conversion processing, audio signal format conversion processing, codec processing, up-sampling processing and down-sampling processing on the audio input signal.

[0010] Preferably, the digital signal processing is a linear or non-linear processing.

[0011] Preferably, the digital signal processing includes phase processing, amplitude processing and delay processing on the audio data.

[0012] Preferably, said digital signal processing comprises recursive, non-recursive and non-linear filtering performed on said audio data.

[0013] Preferably, the audio output signal has the same frequency band components as the audio input signal.

[0014] (Second viewpoint) The present invention provides an in-vehicle virtual multi-channel audio signal processing system, comprising: an input processing module that receives an audio input signal of a single audio channel, identifies different frequency band components in the audio input signal, and allocates audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components; a digital signal processing module that performs digital signal processing of corresponding frequency bands on the audio data in the different signal chains to obtain single channel signals of multiple different frequency bands; an output processing module that superimposes the multiple single channel signals on a single channel audio output signal and outputs the superimposed signal; and a power management module that provides power to the input processing module, the digital signal processing module, and the output processing module.

[0015] (Third viewpoint) The present invention provides an electronic device comprising a memory unit, a processing unit, and a program stored in the memory unit and executable by the processing unit, and when the processing unit executes the program, performs steps included in the above-mentioned in-vehicle virtual multi-channel audio signal processing method. Effect of the Invention

[0016] Compared with the prior art, the in-vehicle virtual multi-channel audio signal processing method of the present invention identifies different frequency band components of an audio input signal in a single audio channel, assigns different frequency band audio data in the audio input signal to different signal chains according to the different frequency band components, and performs digital signal processing of the corresponding frequency bands on the audio data in the different signal chains, and finally superimposes and outputs a plurality of single-channel signals of different frequency bands on a single-channel audio output signal, thereby performing digital signal processing in different frequency bands on different speakers connected in parallel to a single audio channel, which not only improves the sound quality of the entire vehicle, but also reduces the cost of the vehicle. [Brief description of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments are briefly described. The drawings in the following description are only some embodiments of the present invention. Those skilled in the art can think of other drawings based on these drawings without creative work. [Figure 1] FIG. 2 is a flowchart of an in-vehicle virtual multi-channel audio signal processing method provided by an embodiment of the present invention. [Diagram 2] FIG. 2 is a connection diagram of a multi-speaker system for an automobile provided according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic flow chart of an in-vehicle virtual multi-channel audio signal processing method provided by embodiment 1 of the present invention; [Figure 4] 1 shows the amplitude-frequency response curve of a three-band digital divider provided by embodiment 1 of the present invention. [Diagram 5] FIG. 2 is a block diagram of an in-vehicle virtual multi-channel audio signal processing system according to a second embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention are described below clearly and in detail. It should be noted that the embodiments described below are only some of the embodiments of the present invention, and are not all of the embodiments. In addition, other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are all included in the scope of protection of the present invention.

[0019] Embodiment 1 An embodiment of the present invention provides an in-vehicle virtual multi-channel audio signal processing method, which, as shown in FIG. 1, includes the following steps:

[0020] S101: Acquire an audio input signal of a single audio channel. The audio input signal may be an analog signal or a digital signal, and may specifically include, but is not limited to, a subwoofer signal, a bass signal, a midrange signal, and a treble signal.

[0021] The audio input signal may be a single audio signal or a mono audio signal and may be obtained from an in-vehicle audio bus.

[0022] S102: Identifying different frequency band components of the audio input signal. The different frequency band components may be low, mid or high frequency band components of the audio input signal.

[0023] In this embodiment, before performing step S102, the following steps are further included.

[0024] The audio input signal is subjected to pre-processing, which includes digital / analog conversion processing of the audio input signal, audio signal format conversion processing, codec processing, upsampling processing, and downsampling processing. S103: Allocating audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components. S104: Perform digital signal processing in corresponding frequency bands on the audio data of the different signal chains to obtain single-channel signals in multiple different frequency bands.

[0025] Here, the digital signal processing is, for example, linear or non-linear processing including but not limited to phase processing, amplitude processing and delay processing on the audio data, and also processing such as recursive filtering, non-recursive filtering and non-linear filtering that can be performed on the audio data. Phase processing, amplitude processing and delay processing mean adjusting phase, amplitude and delay.

[0026] S105: Superimposing a plurality of the single-channel signals to form and output a single-channel audio output signal. Here, the audio output signal has the same frequency band components as the audio input signal.

[0027] When the audio data after digital signal processing in different signal chains is superimposed, the processing includes, but is not limited to, digital / analog conversion processing and power amplification processing.

[0028] This processing method can ensure that the final audio output signal is a single or mono audio signal, played through a single audio channel.

[0029] Different speakers form a multi-speaker system, and in this embodiment, as shown in FIG. 2, the multi-speaker system includes three different kinds of speakers, specifically, a treble unit 6, a midrange unit 7, and a bass unit 8, which are installed at the doors of the car. The treble unit 6, the midrange unit 7, and the bass unit 8 are connected in parallel to the same output channel (single audio channel) of an audio amplifier 9 for output. In this structure, according to the conventional processing method, the treble unit 6, the midrange unit 7, and the bass unit 8 can only use the same digital signal processing parameters, and this processing method using only the same digital signal processing parameters cannot simultaneously meet the optimal audio processing requirements of the treble unit 6, the midrange unit 7, and the bass unit 8, so that the sound quality of the entire vehicle, that is, the acoustic performance or acoustic effect, is not excellent.

[0030] As shown in FIG. 3, the processing method of this embodiment is as follows.

[0031] An audio signal (audio input signal) input from an in-vehicle audio bus is acquired, and the acquired audio input signal is pre-processed. Then, component identification is performed on the pre-processed audio input signal, that is, a three-band digital divider is used to identify high-, mid-, and low-frequency band components in the audio input signal, and the amplitude-frequency response curve of the three-band digital divider is shown in FIG.

[0032] After identifying the different frequency band components in the audio input signal, the signals (audio data) of the different frequency band components are assigned to different signal chains for digital signal processing in the corresponding frequency bands.

[0033] After completing the signal processing of the different frequency band components, the signal superposition of all the processed frequency band components is superimposed into a single signal (audio output signal), which can be output and played back through a single audio channel.

[0034] Compared with the prior art, in this embodiment, the in-vehicle virtual multi-channel audio signal processing method identifies different frequency band components of an audio input signal in a single audio channel, assigns different frequency band audio data in the audio input signal to different signal chains according to the different frequency band components, and performs digital signal processing in the corresponding frequency bands on the audio data in the different signal chains, and finally superimposes the obtained single-channel signals in different frequency bands on a single-channel audio output signal for output, thereby performing digital signal processing in different frequency bands on different speakers connected in parallel to the single audio channel, which not only improves the sound quality of the entire vehicle, but also reduces the cost of the vehicle.

[0035] Embodiment 2 As shown in FIG. 5, the in-vehicle virtual multi-channel audio signal processing system provided by the embodiment of the present invention has the following configuration.

[0036] Input processing module 1: used to obtain a single-channel audio input signal, identify different frequency band components in the audio input signal, and allocate audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components.

[0037] The input processing module 1 is electrically connected to an in-vehicle audio bus 5 and is capable of acquiring an audio input signal of the single audio channel.

[0038] Digital signal processing module 3: Used to perform digital signal processing on the audio data in different signal chains in corresponding frequency bands to obtain single channel signals in multiple different frequency bands.

[0039] The digital signal processing module 3 is electrically connected to the input processing module 1 for acquiring audio data at different signal chains within the input processing module 1 .

[0040] Output processing module 4: configured to superimpose a plurality of the single-channel signals onto a single-channel audio output signal and output the signal.

[0041] The output processing module 4 is electrically connected to the input processing module 1 and the digital signal processing module 3 to obtain the audio signal processed by the digital signal processing module 3 .

[0042] The output processing module 4 is electrically connected to each audio unit (including but not limited to a treble unit, a midrange unit, a bass unit, etc.) of a single audio channel of the above-mentioned multi-speaker system, and outputs the audio output signal after superposition processing to each audio unit via the single audio channel to reproduce the audio.

[0043] Power management module 2: used to supply power to the input processing module 1, the digital signal processing module 3 and the output processing module 4.

[0044] The power management module 2 is connected to the input processing module 1 and the output processing module 4 , and is indirectly electrically connected to the digital signal processing module 3 .

[0045] In this embodiment, the input processing module 1 is used to execute steps S101 to S103 of the first embodiment described above. The digital signal processing module 3 is used to execute step S104 of the first embodiment described above. The output processing module 4 is used to execute step S105 of the first embodiment described above. The power management module 2 is also used for power management of an audio amplifier. In addition, the power management module 2 can also perform power management while supplying power to the input processing module 1, the digital signal processing module 3, and the output processing module 4.

[0046] The in-vehicle virtual multi-channel audio signal processing system of this embodiment can execute the in-vehicle virtual multi-channel audio signal processing method of the above-mentioned embodiment 1, and therefore can realize the technical effects that can be achieved by the in-vehicle virtual multi-channel audio signal processing method of the above-mentioned embodiment 1. Details thereof will be omitted.

[0047] Embodiment 3 An embodiment of the invention provides an electronic device having a memory unit, a processing unit (processor), and a program stored in the memory unit and executable by the processing unit, and the processing unit executes the program to perform steps of the in-vehicle virtual multi-channel audio signal processing method.

[0048] The electronic device of this embodiment can realize the in-vehicle virtual multi-channel audio signal processing method of the above embodiment, and therefore can achieve the technical effects achieved by the in-vehicle virtual multi-channel audio signal processing method of the above embodiment 1. Details thereof will be omitted.

[0049] The above is merely an embodiment of the present invention, and does not limit the scope of the present invention. Any structural transformation, process transformation, or direct or indirect use in other related technical fields based on the specification and drawings of the present invention is within the scope of protection of the present invention.

Claims

1. A method for processing an audio signal of an in-vehicle virtual multi-channel, comprising: obtaining an audio input signal of a single audio channel; identifying different frequency band components within the audio input signal; allocating audio data of different frequency bands in the audio input signal to different signal chains in response to the different frequency band components; performing digital signal processing of corresponding frequency bands on the audio data in different signal chains to obtain single channel signals of multiple different frequency bands; and outputting the plurality of single-channel signals superimposed on a single-channel audio output signal.

2. The in-vehicle virtual multi-channel audio signal processing method according to claim 1 , wherein the audio input signal is an analog signal or a digital signal.

3. The in-vehicle virtual multi-channel audio signal processing method according to claim 2 , wherein the frequency band components of the audio input signal include a low frequency band component, a mid frequency band component and a high frequency band component.

4. prior to carrying out the step of identifying different frequency band components within the audio input signal, 2. The in-vehicle virtual multi-channel audio signal processing method according to claim 1, further comprising the steps of: performing preprocessing on the audio input signal; and, the preprocessing includes digital / analog conversion processing, audio signal format conversion processing, codec processing, upsampling processing, and downsampling processing on the audio input signal.

5. The in-vehicle virtual multi-channel audio signal processing method according to claim 1 , wherein the digital signal processing is linear processing or nonlinear processing.

6. 6. The in-vehicle virtual multi-channel audio signal processing method according to claim 5, wherein the digital signal processing includes phase processing, amplitude processing, and delay processing for the audio data.

7. The in-vehicle virtual multi-channel audio signal processing method according to claim 6 , wherein the digital signal processing includes recursive filtering, non-recursive filtering and non-linear filtering performed on the audio data.

8. 2. The method for processing an in-vehicle virtual multi-channel audio signal according to claim 1, wherein the audio output signal has the same frequency band components as the audio input signal.

9. An in-vehicle virtual multi-channel audio signal processing system, comprising: an input processing module for receiving a single audio channel audio input signal, identifying different frequency band components in the audio input signal, and allocating audio data of different frequency bands in the audio input signal to different signal chains according to the different frequency band components; A digital signal processing module performs digital signal processing of corresponding frequency bands on the audio data in different signal chains to obtain single channel signals of multiple different frequency bands; an output processing module for superimposing a plurality of the single channel signals onto a single channel audio output signal and outputting the superimposed signals; and a power management module that provides power to the input processing module, the digital signal processing module, and the output processing module.

10. An electronic device comprising a memory unit, a processing unit, and a program stored in the memory unit and executable by the processing unit, the electronic device executing steps included in the in-vehicle virtual multi-channel audio signal processing method described in any one of claims 1 to 8 when the processing unit executes the program.

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