CN117292698A - Processing method and device for vehicle-mounted audio data and electronic equipment - Google Patents
Processing method and device for vehicle-mounted audio data and electronic equipment Download PDFInfo
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/003—Changing voice quality, e.g. pitch or formants
- G10L21/007—Changing voice quality, e.g. pitch or formants characterised by the process used
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L13/00—Speech synthesis; Text to speech systems
- G10L13/02—Methods for producing synthetic speech; Speech synthesisers
- G10L13/04—Details of speech synthesis systems, e.g. synthesiser structure or memory management
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- G—PHYSICS
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- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
Abstract
The application provides a processing method and device for vehicle-mounted audio data and electronic equipment, and relates to the technical field of audio processing. The method comprises the following steps: determining a filtering parameter based on impulse responses corresponding to each of a plurality of audio output positions in the vehicle, and determining an audio compensation gain based on the filtering parameter; based on the filtering parameters, filtering the initial vehicle-mounted audio data of voice synthesis, and based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power. Therefore, before the power amplification processing is carried out on the vehicle-mounted audio data, the filtering and audio compensation processing is carried out on the initial vehicle-mounted audio data synthesized by voice, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved.
Description
Technical Field
The present disclosure relates to the field of audio processing technologies, and in particular, to a method and an apparatus for processing vehicle-mounted audio data, and an electronic device.
Background
With the continuous development of vehicle-mounted intelligent technology, functions for human-computer voice interaction, prompt tone, navigation broadcasting and the like in a vehicle become an indispensable part, and the functions are mainly realized through a voice synthesis module in the vehicle.
At present, the voice synthesis module mainly adopts single-channel end-to-end neural network training, and the single-channel vehicle-mounted audio data output by the voice synthesis module is subjected to multi-channel sound effect and mixing processing of the rear-end power amplifier, so that the audio effect actually output at the seat position is far worse than the audio effect output by the voice synthesis module.
Therefore, how to improve the audio effect of the finally output car audio data is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The application provides a processing method and device for vehicle-mounted audio data and electronic equipment, which can effectively improve the audio effect of finally output vehicle-mounted audio data.
The embodiment of the application provides a processing method of vehicle-mounted audio data, which may include:
determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determining an audio compensation gain based on the filtering parameter;
Based on the filtering parameters, filtering the initial vehicle-mounted audio data synthesized by voice to obtain filtered vehicle-mounted audio data;
based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data;
and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
According to the processing method of vehicle-mounted audio data provided by the application, the method for determining the filtering parameters based on impulse responses corresponding to a plurality of audio output positions in a vehicle comprises the following steps:
for each audio output position, determining a common pole of the audio output position based on an impulse response corresponding to the audio output position, a zero point of the audio output position, and the number of filters in the vehicle for performing filtering processing;
and determining the filtering parameters based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of the filters.
According to the method for processing vehicle-mounted audio data provided by the application, the determining the filtering parameter based on the common pole of each audio output position, the impulse response corresponding to each audio output position and the number of filters includes:
Determining a corresponding filter response based on the common pole of each audio output position, the impulse response corresponding to each audio output position and the number of filters;
frequency band division is carried out on the filter response, so that a plurality of corresponding frequency band intervals are obtained;
and performing bilinear transformation on the center frequency and the loudness compensation value of each of the frequency band intervals to obtain the filtering parameters.
According to the processing method of vehicle-mounted audio data provided by the application, the audio compensation gain is determined based on the filtering parameters, and the processing method comprises the following steps:
performing discrete Fourier transform on the filtering parameters, and determining corresponding amplitude frequency response based on a transformation result;
frequency division is carried out on the amplitude frequency response to obtain a plurality of octaves;
and carrying out weighted average processing on the amplitude frequency response of each octave based on the weight corresponding to each octave to obtain the corresponding audio compensation gain.
According to the processing method of vehicle-mounted audio data provided by the application, the weighted average processing is performed on the amplitude frequency response of each octave based on the weight corresponding to each octave, so as to obtain the corresponding audio compensation gain, and the processing method comprises the following steps:
Based on the weights corresponding to the octaves, carrying out weighted average processing on the amplitude frequency responses of the octaves to obtain A weight calculating loudness;
and determining the opposite number of the A weighting loudness as the audio compensation gain.
According to the processing method of the vehicle-mounted audio data provided by the application, the power amplification processing is performed on the compensated vehicle-mounted audio data, and the processing method comprises the following steps:
acquiring an influence factor influencing the output of the vehicle-mounted audio data; the influence factors comprise at least one of vehicle speed, windowing degree and noise signals acquired by an audio acquisition device in the vehicle;
and carrying out power amplification processing on the compensated vehicle-mounted audio data based on the influence factors.
According to the processing method of the vehicle-mounted audio data, the method further comprises the following steps:
for each audio output position, acquiring initial impulse responses corresponding to the audio output positions for a plurality of times;
and determining the average value of the initial impulse responses acquired for multiple times as the impulse response corresponding to the audio output position.
The embodiment of the application also provides a processing device for vehicle-mounted audio data, which may include:
A first determining unit, configured to determine a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determine an audio compensation gain based on the filtering parameter;
the filtering unit is used for carrying out filtering processing on the initial vehicle-mounted audio data synthesized by voice based on the filtering parameters to obtain the vehicle-mounted audio data after filtering;
the compensation unit is used for carrying out audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain to obtain compensated vehicle-mounted audio data;
the amplifying unit is used for carrying out power amplification processing on the compensated vehicle-mounted audio data;
and the output unit is used for outputting the target vehicle-mounted audio data after power amplification.
According to the processing device of vehicle-mounted audio data provided by the application, the first determining unit is used for determining filtering parameters based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and comprises the following steps:
for each audio output position, determining a common pole of the audio output position based on an impulse response corresponding to the audio output position, a zero point of the audio output position, and the number of filters in the vehicle for performing filtering processing;
And determining the filtering parameters based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of the filters.
According to the processing device for vehicle-mounted audio data provided by the application, the first determining unit is configured to determine the filtering parameter based on the common pole of each audio output position, the impulse response corresponding to each audio output position, and the number of filters, and includes:
determining a corresponding filter response based on the common pole of each audio output position, the impulse response corresponding to each audio output position and the number of filters;
frequency band division is carried out on the filter response, so that a plurality of corresponding frequency band intervals are obtained;
and performing bilinear transformation on the center frequency and the loudness compensation value of each of the frequency band intervals to obtain the filtering parameters.
According to the processing device of vehicle-mounted audio data provided by the application, the first determining unit is used for determining the audio compensation gain based on the filtering parameter, and comprises the following steps:
performing discrete Fourier transform on the filtering parameters, and determining corresponding amplitude frequency response based on a transformation result;
Frequency division is carried out on the amplitude frequency response to obtain a plurality of octaves;
and carrying out weighted average processing on the amplitude frequency response of each octave based on the weight corresponding to each octave to obtain the corresponding audio compensation gain.
According to the processing device for vehicle-mounted audio data provided by the application, the first determining unit is configured to perform weighted average processing on amplitude frequency responses of the multiple octaves based on weights corresponding to the multiple octaves, to obtain corresponding audio compensation gains, and includes:
based on the weights corresponding to the octaves, carrying out weighted average processing on the amplitude frequency responses of the octaves to obtain A weight calculating loudness;
and determining the opposite number of the A weighting loudness as the audio compensation gain.
According to the processing device for vehicle-mounted audio data provided by the application, the amplifying unit is used for performing power amplification processing on the compensated vehicle-mounted audio data, and comprises the following components:
acquiring an influence factor influencing the output of the vehicle-mounted audio data; the influence factors comprise at least one of vehicle speed, windowing degree and noise signals acquired by an audio acquisition device in the vehicle;
And carrying out power amplification processing on the compensated vehicle-mounted audio data based on the influence factors.
According to the processing device of the vehicle-mounted audio data, which is provided by the application, the device is further provided with an acquisition unit and a second determination unit;
the acquisition unit is used for acquiring initial impulse responses corresponding to the audio output positions for a plurality of times according to the audio output positions;
the second determining unit is configured to determine an average value of the initial impulse responses acquired multiple times as the impulse response corresponding to the audio output position.
The embodiment of the application also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the processing method of the vehicle-mounted audio data when executing the program.
The embodiments of the present application also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for processing vehicle-mounted audio data as described in any one of the above.
The present application also provides a computer program product comprising a computer program which, when executed by a processor, implements a method of processing vehicle audio data as described in any one of the above.
According to the processing method, the processing device and the electronic equipment for the vehicle-mounted audio data, the filtering parameters are determined based on impulse responses corresponding to the audio output positions in the vehicle, and the audio compensation gain is determined based on the filtering parameters; based on the filtering parameters, filtering the initial vehicle-mounted audio data of voice synthesis, and based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power. Therefore, before the power amplification processing is carried out on the vehicle-mounted audio data, the filtering and audio compensation processing is carried out on the initial vehicle-mounted audio data synthesized by voice, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved.
Drawings
For a clearer description of the present application or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a processing method of vehicle audio data according to an embodiment of the present application;
fig. 2 is a flowchart of a method for determining a filtering parameter according to an embodiment of the present application;
fig. 3 is a flowchart of a method for determining an audio compensation gain based on a filtering parameter according to an embodiment of the present application;
fig. 4 is a flowchart of a method for performing power amplification processing on compensated vehicle-mounted audio data according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a processing device for vehicle audio data according to an embodiment of the present application;
fig. 6 is a schematic entity structure diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/" generally indicates that the front-rear association object is an or relationship.
The technical scheme provided by the embodiment of the application can be applied to an audio processing scene. Taking a car audio data processing scenario as an example, in the car audio processing scenario, its processing operation is mainly completed by a speech synthesis module in the vehicle. At present, the single-channel vehicle-mounted audio data output by the voice synthesis module is subjected to multi-channel sound effect and mixing treatment of the rear-end power amplifier, so that the audio effect actually output at the seat position is far worse than the audio effect output by the voice synthesis module.
In order to effectively improve the audio effect of the finally output vehicle-mounted audio data, in the embodiment of the application, the vehicle-mounted audio data output by the voice synthesis module can be considered to be subjected to filtering treatment before being output by the rear-end power amplifier, and the filtered vehicle-mounted audio data is subjected to audio compensation to obtain compensated vehicle-mounted audio data; and then the compensated vehicle-mounted audio data is input to the power amplifier for output, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved by filtering and audio compensation processing on the initial vehicle-mounted audio data synthesized by voice before the vehicle-mounted audio data is output by the rear-end power amplifier.
Next, a method of processing the in-vehicle audio data provided in the present application will be described in detail by the following several specific embodiments. It is to be understood that the following embodiments may be combined with each other and that some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 is a flow chart of a processing method of vehicle audio data according to an embodiment of the present application, where the processing method of vehicle audio data may be executed by a software and/or hardware device. For example, referring to fig. 1, the processing method of the vehicle audio data may include:
s101, determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in the vehicle, and determining an audio compensation gain based on the filtering parameter.
Where the plurality of audio output positions is the position of the speaker in the vehicle, it is common to have the position of the seat, for example four seats, in front of the headrest. Impulse response refers to the zero state response that the system causes under the excitation of a unit impulse function.
Illustratively, in the embodiments of the present application, the filtering parameters may be filtering parameters employing N cascaded Biquad IIR filters. And aiming at each audio output position, only obtaining one filtered vehicle-mounted audio data after the filtering parameters of N cascaded biquad IIR filters. The value of N may be set according to actual needs, for example, the value of N may be any integer between 4 and 10.
For example, in acquiring impulse responses (Impusle Responses, IRs) corresponding to respective ones of a plurality of audio output locations in a vehicle, a frequency of employment of the impulse responses may be determined. In determining the frequency of use of the impulse response, it is generally necessary to ensure that the frequency of use of the impulse response is higher than the sampling frequency fs_s of the speech synthesis module, which is typically 24kHz. In addition, in the embodiment of the application, the impulse response obtained through measurement only keeps a causal part, so that the influence of nonlinearity of a loudspeaker system on subsequent multipoint sound field equalization can be effectively reduced.
After the impulse responses corresponding to the audio output positions in the vehicle are obtained based on the adopted frequency of the impulse responses, the impulse responses corresponding to the audio output positions can be subjected to downsampling, and the target sampling frequency Fs_target of the default downsampling is equal to the sampling frequency Fs_s of the voice synthesis module. However, for the speech synthesis module with high real-time performance, low resources or offline small model, the upper limit fs_avail of the effective frequency of the synthesized speech is far smaller than the sampling frequency fs_s/2 of the speech synthesis module, so in the embodiment of the application, the detection of the effective frequency range output by the speech synthesis module can be used as a parameter input, and the target sampling frequency is correspondingly and synchronously adjusted to be twice the upper limit of the actual effective frequency, namely Thereby determining the frequency of use of the impulse response.
In the method, for example, in the embodiment of the application, for each audio output position, an initial impulse response corresponding to the audio output position may be acquired for multiple times based on the sampling frequency; and calculating the average value of the initial impulse responses acquired for multiple times, and determining the average value of the initial impulse responses acquired for multiple times as the impulse response corresponding to the audio output position, so that the impulse response corresponding to the audio output position is determined by combining the initial impulse responses acquired for multiple times, and the accuracy of the determined impulse response can be effectively improved.
After impulse responses corresponding to the audio output positions in the vehicle are obtained, filtering parameters can be determined based on the impulse responses corresponding to the audio output positions, and audio compensation gains can be determined based on the filtering parameters, so that the initial vehicle-mounted audio data of speech synthesis can be filtered based on the determined filtering parameters before the vehicle-mounted audio data is output through the rear-end power amplifier, and the filtered audio compensation processing is performed based on the determined audio compensation gains, namely the following S102 and S103 are executed, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved.
S102, filtering processing is carried out on the initial vehicle-mounted audio data synthesized by voice based on the filtering parameters, and the filtered vehicle-mounted audio data is obtained.
In this embodiment of the present application, when the filtering process is performed on the initial vehicle-mounted audio data of speech synthesis based on the filtering parameters, the filtering process corresponding to each biquad IIR filter may be shown in the following formula 1:
equation 1
Wherein,indicate->Initial in-vehicle audio data for speech synthesis at individual moments +.>Vehicle-mounted audio data subjected to filtering processing, +.>And->Representing the filter coefficients of a biquad IIR filter>Represent the firstInitial vehicle audio data for speech synthesis at individual moments, < >>Indicate->Initial vehicle audio data for speech synthesis at individual moments, < >>Indicate->Initial in-vehicle audio data for speech synthesis at individual moments +.>Vehicle-mounted audio data subjected to filtering processing, +.>Indicate->Initial vehicle-mounted audio data synthesized by voice at each momentAnd carrying out filtering processing on the vehicle-mounted audio data.
It can be seen that, in the embodiment of the present application, when the filtering process is performed on the initial vehicle-mounted audio data of the current speech synthesis based on the filtering parameters, the results of the current filtering process are determined together by combining the initial vehicle-mounted audio data of the previous two speech synthesis and the vehicle-mounted audio data obtained after the respective filtering processes, so that the accuracy of the filtered vehicle-mounted audio data can be effectively improved.
And S103, performing audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain to obtain compensated vehicle-mounted audio data.
By performing audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain, the audio effect of the vehicle-mounted audio data can be effectively improved.
After the compensated car audio data is obtained, if the signal amplitude of the compensated car audio data is within the range of the clipping protection, that is, not lower than the lower limit value of the clipping protection and not higher than the upper limit value of the clipping protection, the power amplification processing can be directly performed on the compensated car audio data, and the target car audio data with amplified power is output, that is, the following S104 is executed; if the signal amplitude of the compensated vehicle-mounted audio data is not in the range of the amplitude limiting protection, namely is lower than the lower limit value of the amplitude limiting protection or is higher than the upper limit value of the amplitude limiting protection, the amplitude limiting protection can be carried out on the filtered vehicle-mounted audio data through the amplitude limiter, so that the signal amplitude of the amplitude-limited vehicle-mounted audio data is not lower than the lower limit value of the amplitude limiting protection and is not higher than the upper limit value of the amplitude limiting protection, and the audio quality and stability of the vehicle-mounted audio data can be effectively improved through the amplitude limiting protection.
S104, performing power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
It can be seen that, in the embodiment of the present application, when the vehicle-mounted audio data is output, a filtering parameter is determined based on impulse responses corresponding to a plurality of audio output positions in the vehicle, and an audio compensation gain is determined based on the filtering parameter; filtering the initial vehicle-mounted audio data synthesized by voice based on the filtering parameters, and performing audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power. Therefore, before the power amplification processing is carried out on the vehicle-mounted audio data, the filtering and audio compensation processing is carried out on the initial vehicle-mounted audio data synthesized by voice, and the audio effect of the finally output vehicle-mounted audio data can be effectively improved, so that the audio effect of the space sound field in the vehicle can be better ensured.
Based on the embodiment shown in fig. 1 described above, in order to facilitate understanding how the filter parameters are determined based on impulse responses corresponding to each of a plurality of audio output positions in the vehicle in S101 described above, a detailed description will be given below by way of the embodiment shown in fig. 2.
Fig. 2 is a flowchart of a method for determining a filtering parameter according to an embodiment of the present application, which may be performed by a software and/or hardware device. For example, referring to fig. 2, the method may include:
s201, determining common pole points of the audio output positions based on impulse responses corresponding to the audio output positions, zero points of the audio output positions and the number of filters used for filtering processing in the vehicle.
In the embodiment of the application, for example, when determining the common pole point of the audio output position based on the impulse response corresponding to the audio output position, the zero point of the audio output position, and the number of filters used for performing the filtering process in the vehicle, the equalization compensation process may be performed only for the common pole point of the audio output position to determine the firstFor example, the common pole of the audio output positions can be found in the following equation 2:
equation 2
Wherein,indicate->Impulse response corresponding to audio output position, < >>Representing parameters related to fourier transform, +.>Indicate->The number of audio output positions, M, is usually between 0 and 1024, ">Zero indicating the i-th audio output position, < > >Representing the number of audio output positions +.>Representing the number of filters, +.>Indicate->The common pole of the audio output positions can be determined by a calculation process which can be solved by a least squares estimation assuming that all the audio output position AR coefficients are the same, or by linearly averaging a plurality of audio output position AR coefficients.
After determining the common pole of each audio output position, the following S202 may be performed:
s202, determining filtering parameters based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of filters.
Illustratively, in the embodiment of the present application, when determining the filtering parameter based on the common pole of each audio output position, the impulse response corresponding to each audio output position, and the number of filters, the corresponding filtering response may be determined based on the common pole of each audio output position, the impulse response corresponding to each audio output position, and the number of filters; frequency band division is carried out on the filter response, and a plurality of corresponding frequency band intervals are obtained; and performing bilinear transformation on the center frequency and the loudness compensation value of each of the frequency band intervals, thereby obtaining filtering parameters.
For example, the corresponding filter response may be determined based on the common pole of each audio output position, the impulse response corresponding to each audio output position, and the number of filters, and may be for a common formant of the plurality of audio output positions, i.e., the common poleIs compensated for by a single channel compensation filter response under equalization with target constraint of ideal unit pulsesSee equation 3 below:
equation 3
In combination with equation 3, a corresponding filter response can be obtained. After obtaining the corresponding filter response, the filter response may be considered to be frequency-band-divided, with the purpose of: the loudness increase and decrease in different frequency bands are qualitatively obtained, the performance of the FIR filter adopting a dual-second-level IIR filter bank to approach the optimal compensation curve is further met, and the audio post-processing time delay of the voice synthesis module is compressed and optimized while the overall trend effect of sound field equalization is met.
It may be understood that in the embodiment of the present application, the filtering response is subjected to frequency band division, and the frequency band division manner and the frequency band number thereof may be set according to actual needs, where the embodiment of the present application is not specifically limited.
Typically, a typical demonstration may frequency segment the filter response by <300Hz, 300Hz-1kHz, 1kHz-4kHz, 4kHz-12kHz, resulting in four bins, and calculate the loudness compensation value for each bin. It will be appreciated that in the embodiments of the present application, the calculation of the loudness compensation value for each band interval may be given according to forms including, but not limited to, the ITU standard, the EBU standard, the Zwicker model, the moorr model, or the simpler RMS value, and may be specifically set according to actual needs.
In the embodiment of the application, N cascaded biquad IIR filters may form a cascaded biquad IIR filter bank, and the a weight ratio of each frequency band interval may be calculated respectively, so as to determine the loudness compensation value of each frequency band interval. Taking four frequency band intervals as examples, wherein the frequency band interval is <300Hz, the frequency band interval is 300Hz-1kHz, the frequency band interval is 1kHz-4kHz and the frequency band interval is 4kHz-12kHz, in an ideal state, the loudness compensation values of the four frequency band intervals are respectively: 3dB, -1dB, 5dB and 3dB, a cascaded dual-second-level IIR filter set expressed by 4 cascaded PEQ parameters can be adopted to realize approximation of the FIR compensation filter, wherein the Q value is generally not excessively large so as to avoid triggering amplitude limiting protection due to excessively large signal amplitude variation, and the specific obtained example is as follows:
(1) The center frequency of the band interval <300Hz is 300Hz, the loudness compensation value = -3, q = 1 lowshell.
(2) Bell with a center frequency of 600Hz in the frequency band interval 300Hz-1kHz, a loudness compensation value of = -1, and Q=1.
(3) Bell with a center frequency of 2kHz, a loudness compensation value=5, q=1, for the band interval 1kHz-4 kHz.
(4) The center frequency 4kHz between the band interval 4kHz-12kHz, loudness compensation value=3, q=1 highshell.
Further, the center frequency and the loudness compensation value of each of the plurality of frequency band intervals are subjected to bilinear transformation, that is, the center frequency and the loudness compensation value can be converted into filter coefficients of a cascaded biquad IIR filter bank, which can be expressed as: The filtering parameters of the cascaded dual-second-order IIR filter can be obtained by the following steps:
[ 0.99622926,-1.95259319,0.95787047,1,-1.95228244,0.95441048],
[ 0.99541508,-1.90977355,0.92026386,1,-1.90977355,0.91567895],
[ 1.08917648,-1.71049705,0.68166037,1,-1.71049705,0.77083685],
[ 1.34562266,-2.00148508,0.87022177,1,-1.38564065,0.6]
determining a common pole point of the audio output position based on impulse response corresponding to the audio output position, zero points of the audio output position and the number of filters used for filtering in the vehicle; and the filtering parameters are determined based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of filters, so that the initial vehicle-mounted audio data synthesized by voice is subjected to filtering treatment before the vehicle-mounted audio data is subjected to power amplification treatment, the audio effect of the finally output vehicle-mounted audio data can be effectively improved, and the audio effect of a space sound field in a vehicle can be better ensured.
Based on any of the above embodiments, in order to facilitate understanding how the audio compensation gain is determined based on the filter parameters in S101 described above, a detailed description will be made below by way of the embodiment shown in fig. 3.
Fig. 3 is a flowchart of a method for determining an audio compensation gain based on a filtering parameter according to an embodiment of the present application, which may be performed by a software and/or hardware device. For example, referring to fig. 3, the method may include:
S301, performing discrete Fourier transform on the filtering parameters, and determining corresponding amplitude frequency response based on the transformation result.
With filter coefficients of a cascaded bi-level IIR filter bankFor example, the filtering parameters may be first subjected to discrete fourier transform, and the corresponding amplitude-frequency response may be determined based on the transform result, which may be specifically shown in the following equation 4:
equation 4
Wherein sosfreqz represents performing discrete fourier transform on the filtering parameters, the obtained transform result comprises an amplitude frequency response and a phase frequency response, and abs represents determining the amplitude frequency response H (z) from the transform result.
S302, frequency division is carried out on the amplitude frequency response, and a plurality of octaves are obtained.
The number of octaves may be set according to actual needs, and the embodiment of the present application is not further limited to the specific number of octaves.
S303, carrying out weighted average processing on the amplitude frequency response of each octave based on the weight corresponding to each octave, and obtaining the corresponding audio compensation gain.
In this embodiment of the present application, when performing weighted average processing on the amplitude frequency response of each of the multiple octaves based on the weight corresponding to each of the multiple octaves, the weighted average processing may be performed on the amplitude frequency response of each of the multiple octaves based on the weight corresponding to each of the multiple octaves to obtain a weighted loudness; and determining the inverse number of the weighted loudness of a as the audio compensation gain.
Based on the weights corresponding to the octaves, the amplitude frequency response of each octave is weighted and averaged, and when the A weight measurement loudness is obtained, the following formula 5 can be seen:
equation 5
Wherein,indicating the A weight counting degree,/>Representing the number of octaves +.>Indicate->Amplitude frequency response of individual octaves, +.>Indicate->The amplitude frequency response of each octave is correspondingly weighted.
Calculating to obtain A weightAfter that, the +.>The final audio compensation gain is determined.
In this way, the discrete Fourier transform is carried out on the filtering parameters, the corresponding amplitude frequency response is determined based on the transformation result, and the frequency division is carried out on the amplitude frequency response to obtain a plurality of octaves; and then, based on the weight corresponding to each of the octaves, carrying out weighted average processing on the amplitude frequency response of each of the octaves to obtain corresponding audio compensation gain, so that after the initial vehicle-mounted audio data synthesized by voice is subjected to filtering processing based on the filtering parameters, the filtered vehicle-mounted audio data is subjected to audio compensation processing based on the audio compensation gain, and thus, the audio effect of the finally output vehicle-mounted audio data can be effectively improved, and the audio effect of a spatial sound field in a vehicle can be better ensured.
Based on any one of the embodiments, in the embodiment of the present application, when the compensated vehicle-mounted audio data is subjected to power amplification, in order to better fit the actual scene, the compensated vehicle-mounted audio data is subjected to power amplification, and the compensated vehicle-mounted audio data can be subjected to power amplification in combination with the real-time working condition of the vehicle, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved, and the audio effect of the spatial sound field in the vehicle can be better ensured.
In order to facilitate understanding how to perform power amplification processing on the compensated car audio data in combination with the real-time working condition of the vehicle, that is, how to perform power amplification processing on the compensated car audio data in S104 described above, the embodiment shown in fig. 4 will be described in detail.
Fig. 4 is a flowchart of a method for performing power amplification processing on compensated vehicle-mounted audio data according to an embodiment of the present application, where the method may be performed by a software and/or hardware device. For example, referring to fig. 4, the method may include:
s401, acquiring an influence factor influencing the output of vehicle-mounted audio data; the influence factors comprise at least one of vehicle speed, windowing degree and noise signals acquired by an audio acquisition device in the vehicle.
In this embodiment of the present application, the influence factor that influences the output of the vehicle audio data may be obtained through a controller area network bus (Controller Area Network, CAN) network protocol in the vehicle, and the specific implementation of the influence factor may refer to the existing related implementation, which is not described herein in detail.
After the influence factor that influences the output of the in-vehicle audio data is acquired, the following S402 may be executed:
and S402, performing power amplification processing on the compensated vehicle-mounted audio data based on the influence factors.
For example, in the embodiment of the present application, when performing power amplification processing on the compensated vehicle-mounted audio data based on the impact factor, the corresponding noise level may be determined based on the impact factor first; based onA volume compensation gain is determined.
Wherein,indicating volume compensation gain, < >>Representing noise level, ++>The second term coefficient, the first term coefficient and the constant term coefficient are respectively represented, and can be specifically determined according to the actual working condition noise.
In this way, before the power amplification processing is performed on the vehicle-mounted audio data, after the filtering processing is performed on the initial vehicle-mounted audio data synthesized by voice based on the filtering parameters, the audio compensation processing is performed on the filtered vehicle-mounted audio data based on the audio compensation gain; and combining the influence factors influencing the output of the vehicle-mounted audio data, and performing power amplification processing on the compensated vehicle-mounted audio data, so that the audio effect of the finally output vehicle-mounted audio data can be effectively improved, and the audio effect of the space sound field in the vehicle can be better ensured.
The processing device for the vehicle-mounted audio data provided by the application is described below, and the processing device for the vehicle-mounted audio data described below and the processing method for the vehicle-mounted audio data described above can be referred to correspondingly.
Fig. 5 is a schematic structural diagram of a processing device for vehicle audio data according to an embodiment of the present application, for example, referring to fig. 5, the processing device 50 for vehicle audio data may include:
the first determining unit 501 is configured to determine a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determine an audio compensation gain based on the filtering parameter.
And the filtering unit 502 is configured to perform filtering processing on the initial vehicle-mounted audio data of the speech synthesis based on the filtering parameters, so as to obtain filtered vehicle-mounted audio data.
And the compensating unit 503 is configured to perform audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain, so as to obtain compensated vehicle-mounted audio data.
An amplifying unit 504, configured to perform power amplification processing on the compensated vehicle audio data;
an output unit 505 for outputting the power-amplified target car audio data.
Illustratively, in the embodiment of the present application, the first determining unit 501 is configured to determine, based on impulse responses corresponding to a plurality of audio output positions in a vehicle, a filtering parameter, including:
for each audio output position, determining a common pole of the audio output position based on an impulse response corresponding to the audio output position, a zero point of the audio output position, and the number of filters in the vehicle for performing filtering processing;
and determining the filtering parameters based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of the filters.
Illustratively, in the embodiment of the present application, the first determining unit 501 is configured to determine the filtering parameter based on the common pole of each audio output position, the impulse response corresponding to each audio output position, and the number of filters, and includes:
determining a corresponding filter response based on the common pole of each audio output position, the impulse response corresponding to each audio output position and the number of filters;
frequency band division is carried out on the filter response, so that a plurality of corresponding frequency band intervals are obtained;
And performing bilinear transformation on the center frequency and the loudness compensation value of each of the frequency band intervals to obtain the filtering parameters.
Illustratively, in the embodiment of the present application, the first determining unit 501 is configured to determine an audio compensation gain based on the filtering parameter, and includes:
performing discrete Fourier transform on the filtering parameters, and determining corresponding amplitude frequency response based on a transformation result;
frequency division is carried out on the amplitude frequency response to obtain a plurality of octaves;
and carrying out weighted average processing on the amplitude frequency response of each octave based on the weight corresponding to each octave to obtain the corresponding audio compensation gain.
Illustratively, in the embodiment of the present application, the first determining unit 501 is configured to perform weighted average processing on the amplitude frequency responses of the multiple octaves based on the weights corresponding to the multiple octaves, to obtain corresponding audio compensation gains, where the weighted average processing includes:
based on the weights corresponding to the octaves, carrying out weighted average processing on the amplitude frequency responses of the octaves to obtain A weight calculating loudness;
and determining the opposite number of the A weighting loudness as the audio compensation gain.
Illustratively, in the embodiment of the present application, the amplifying unit 504 is configured to perform power amplification processing on the compensated vehicle audio data, and includes:
acquiring an influence factor influencing the output of the vehicle-mounted audio data; the influence factors comprise at least one of vehicle speed, windowing degree and noise signals acquired by an audio acquisition device in the vehicle;
and carrying out power amplification processing on the compensated vehicle-mounted audio data based on the influence factors.
Illustratively, in the embodiment of the present application, the processing device 50 for vehicle audio data further includes a collecting unit and a second determining unit.
The acquisition unit is used for acquiring initial impulse responses corresponding to the audio output positions for a plurality of times according to the audio output positions;
the second determining unit is configured to determine an average value of the initial impulse responses acquired multiple times as the impulse response corresponding to the audio output position.
The processing device 50 for vehicle-mounted audio data provided in this embodiment may execute the technical scheme of the processing method for vehicle-mounted audio data in any embodiment, and its implementation principle and beneficial effects are similar to those of the processing method for vehicle-mounted audio data, and may refer to the implementation principle and beneficial effects of the processing method for vehicle-mounted audio data, which are not described herein again.
Fig. 6 is a schematic physical structure diagram of an electronic device according to an embodiment of the present application, as shown in fig. 6, the electronic device may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may call logic instructions in the memory 630 to perform a method of processing car audio data, the method comprising: determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determining an audio compensation gain based on the filtering parameter; based on the filtering parameters, filtering the initial vehicle-mounted audio data synthesized by voice to obtain filtered vehicle-mounted audio data; based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present application further provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer can execute a method for processing vehicle audio data provided by the above methods, where the method includes: determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determining an audio compensation gain based on the filtering parameter; based on the filtering parameters, filtering the initial vehicle-mounted audio data synthesized by voice to obtain filtered vehicle-mounted audio data; based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
In still another aspect, the present application also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method of processing vehicle-mounted audio data provided by the above methods, the method comprising: determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determining an audio compensation gain based on the filtering parameter; based on the filtering parameters, filtering the initial vehicle-mounted audio data synthesized by voice to obtain filtered vehicle-mounted audio data; based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data; and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected based on actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method of processing vehicle-mounted audio data, comprising:
determining a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determining an audio compensation gain based on the filtering parameter;
based on the filtering parameters, filtering the initial vehicle-mounted audio data synthesized by voice to obtain filtered vehicle-mounted audio data;
based on the audio compensation gain, performing audio compensation on the filtered vehicle-mounted audio data to obtain compensated vehicle-mounted audio data;
and carrying out power amplification processing on the compensated vehicle-mounted audio data, and outputting target vehicle-mounted audio data with amplified power.
2. The method of claim 1, wherein the determining the filter parameters based on impulse responses corresponding to respective ones of the plurality of audio output locations in the vehicle comprises:
for each audio output position, determining a common pole of the audio output position based on an impulse response corresponding to the audio output position, a zero point of the audio output position, and the number of filters in the vehicle for performing filtering processing;
and determining the filtering parameters based on the common pole of each audio output position, impulse response corresponding to each audio output position and the number of the filters.
3. The method of claim 2, wherein the determining the filtering parameters based on the common pole of each audio output location, the impulse response for each audio output location, and the number of filters comprises:
determining a corresponding filter response based on the common pole of each audio output position, the impulse response corresponding to each audio output position and the number of filters;
frequency band division is carried out on the filter response, so that a plurality of corresponding frequency band intervals are obtained;
and performing bilinear transformation on the center frequency and the loudness compensation value of each of the frequency band intervals to obtain the filtering parameters.
4. A method according to any of claims 1-3, wherein said determining an audio compensation gain based on said filtering parameters comprises:
performing discrete Fourier transform on the filtering parameters, and determining corresponding amplitude frequency response based on a transformation result;
frequency division is carried out on the amplitude frequency response to obtain a plurality of octaves;
and carrying out weighted average processing on the amplitude frequency response of each octave based on the weight corresponding to each octave to obtain the corresponding audio compensation gain.
5. The method of claim 4, wherein said performing a weighted average process on the magnitude frequency response of each of the plurality of octaves based on the weight corresponding to each of the plurality of octaves to obtain a corresponding audio compensation gain comprises:
based on the weights corresponding to the octaves, carrying out weighted average processing on the amplitude frequency responses of the octaves to obtain A weight calculating loudness;
and determining the opposite number of the A weighting loudness as the audio compensation gain.
6. A method according to any one of claims 1 to 3, wherein the performing power amplification processing on the compensated car audio data includes:
Acquiring an influence factor influencing the output of the vehicle-mounted audio data; the influence factors comprise at least one of vehicle speed, windowing degree and noise signals acquired by an audio acquisition device in the vehicle;
and carrying out power amplification processing on the compensated vehicle-mounted audio data based on the influence factors.
7. A method according to claim 2 or 3, characterized in that the method further comprises:
for each audio output position, acquiring initial impulse responses corresponding to the audio output positions for a plurality of times;
and determining the average value of the initial impulse responses acquired for multiple times as the impulse response corresponding to the audio output position.
8. A processing apparatus for vehicle-mounted audio data, comprising:
a first determining unit, configured to determine a filtering parameter based on impulse responses corresponding to a plurality of audio output positions in a vehicle, and determine an audio compensation gain based on the filtering parameter;
the filtering unit is used for carrying out filtering processing on the initial vehicle-mounted audio data synthesized by voice based on the filtering parameters to obtain the vehicle-mounted audio data after filtering;
the compensation unit is used for carrying out audio compensation on the filtered vehicle-mounted audio data based on the audio compensation gain to obtain compensated vehicle-mounted audio data;
The amplifying unit is used for carrying out power amplification processing on the compensated vehicle-mounted audio data;
and the output unit is used for outputting the target vehicle-mounted audio data after power amplification.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of processing vehicle audio data according to any one of claims 1 to 7 when the program is executed.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the processing method of in-vehicle audio data according to any one of claims 1 to 7.
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