CN115567844B - Self-adaptive equalizer compensation method and system for vehicle-mounted sound equipment - Google Patents
Self-adaptive equalizer compensation method and system for vehicle-mounted sound equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- B60—VEHICLES IN GENERAL
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- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
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Abstract
The invention provides a self-adaptive equalizer compensation method and a self-adaptive equalizer compensation system for a vehicle-mounted sound. An adaptive equalizer compensation method for a vehicle audio, the method comprising: collecting a sound signal output by a vehicle-mounted sound device by utilizing a sound collecting device to obtain a first detection signal; analyzing and processing the first detection signal by using a filter to obtain a second detection signal; calculating and generating an audio compensation signal according to the second detection signal and the original audio signal; and loading the audio compensation signal to an equalizer, and compensating the output signal of the vehicle-mounted sound by using the equalizer. The method comprises the steps of collecting output signals of the vehicle-mounted sound equipment, calculating differences between the output signals and original signals, generating audio compensation signals, loading the audio compensation signals on the equalizer, compensating the output signals of the vehicle-mounted sound equipment by using the equalizer, compensating distortion and loss in a signal transmission process, and improving listening experience of people.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted electronic equipment, in particular to a method and a system for compensating an adaptive equalizer of a vehicle-mounted sound.
Background
The automobile is one of the transportation means that people go out, along with the improvement of people's living standard, quality of life, the requirement to enjoyment is higher and higher, as the on-vehicle stereo set of one of the on-vehicle electronic equipment, and in the in-process of going out, the tired can be alleviated to the music that is pleasing to the eye, utilizes on-vehicle stereo set broadcast music etc. can improve the comfort level of riding well.
The automobile can be interfered by a lot of noise in the driving process, the playing of the vehicle-mounted sound equipment is also interfered in the complex environment, the audio signal is influenced by the equipment, after being played through the vehicle-mounted sound equipment, the output signal and the original signal can be different, distortion and loss are generated in the signal transmission process, and the listening experience of people is reduced.
Disclosure of Invention
Aiming at the problems, the application provides a self-adaptive equalizer compensation method and a self-adaptive equalizer compensation system for vehicle-mounted sound equipment, which utilize an equalizer to compensate output signals of the vehicle-mounted sound equipment, compensate distortion and loss occurring in a signal transmission process, and improve listening experience of people.
The technical scheme of the invention is as follows: an adaptive equalizer compensation method of a vehicle-mounted sound comprises the following steps:
S11, acquiring a signal, namely acquiring a sound signal output by a vehicle-mounted sound device by utilizing sound acquisition equipment to obtain a first detection signal;
s12, signal analysis, namely analyzing and processing the first detection signal by using a filter to obtain a second detection signal;
s13, signal generation, namely calculating and generating an audio compensation signal according to the second detection signal and the original audio signal;
S14, signal compensation, namely loading an audio compensation signal to an equalizer, and compensating an output signal of the vehicle-mounted sound by using the equalizer;
The equalizer consists of m filters, the sound frequency range of 20-20kHz is divided into m categories, and each category corresponds to one filter;
The m filters are bandpass filters, and overlapping parts exist in the pass bands of the m bandpass filters; in step S14, gain parameters corresponding to the audio compensation signal are calculated based on the parameters of the equalizer, and the equalizer is adjusted based on the average value of the gain parameters, so as to complete the gain initialization of the equalizer.
As a further preferable scheme, in the step S11, the vehicle-mounted audio system is used to play the original audio, collect the first detection signal for the first time at the first preset time point, collect the next time after the preset collection interval, and stop collecting after the preset number of the first detection signals are collected;
In the step S12, the filter is used to analyze the first detection signals to obtain a preset number of first detection signals;
The first preset time point is a time point corresponding to the time point when the original audio playing duration is t.
As a still further preferable embodiment, the step S13 further includes: intercepting the original audio signals for the first time at a second preset time point, intercepting the original audio signals for the next time after the preset acquisition interval, and stopping intercepting after intercepting the preset number of the original audio signals;
the second preset time point is obtained by subtracting the play time delay from the first preset time point.
As a still further preferable aspect, for the step S14, further includes:
and calculating gain parameters corresponding to the preset number of audio compensation signals based on the parameters of the equalizer, taking the average value of the gain parameters, and adjusting the equalizer based on the average value of the gain parameters to finish the gain initialization of the equalizer.
As a further preferred scheme, after the gain initialization of the equalizer is completed, the equalizer is adjusted by adopting the following steps:
S21, detecting an output signal, and detecting a compensated vehicle-mounted sound output signal by using an audio signal detection device;
S22, comparing the detected compensated vehicle-mounted sound output signal with an original audio signal corresponding to the compensated vehicle-mounted sound output signal, and calculating a gain signal of the original audio signal corresponding to the compensated vehicle-mounted sound output signal;
S23, correcting and judging, namely calculating the gain of each filter according to the gain signal of the original audio signal and the parameters of the equalizer in the step S22, judging whether the gain is larger than or equal to a preset threshold value, if so, adjusting the target filter, otherwise, not adjusting the target filter;
for the step S22, calculating gain signals of the original audio signals corresponding to the compensated vehicle-mounted audio output signals, which are average gains of the gain signals of the original audio signals corresponding to the plurality of compensated vehicle-mounted audio output signals;
For said step S23, each filter is set with a different preset threshold.
As a further preferable scheme, the method uses the audio signal detection device to detect the compensated vehicle-mounted sound output signal, the method is executed at a preset time point, and when the vehicle-mounted sound playing time length reaches the preset time length, the audio signal detection device is used to detect the compensated vehicle-mounted sound output signal.
An adaptive equalizer compensation system for a vehicle audio system, comprising:
the signal acquisition module is used for acquiring output signals of the vehicle-mounted sound equipment;
The signal analysis module is used for analyzing and processing the output signals of the acquired vehicle-mounted sound equipment;
The signal generation module is used for calculating and generating an audio compensation signal corresponding to the output signal of the vehicle-mounted sound equipment;
The gain calculation module is used for calculating gain parameters of the equalizer;
and the control module is used for adjusting the gain of the equalizer according to the gain parameter of the equalizer.
As a still further preferred aspect, the system further comprises:
and a self-checking module: for periodic self-checking of the equalizer's tuning action;
gain adjustment module: for adjusting the gain of the equalizer;
The self-checking module periodically calculates equalizer gain parameters corresponding to the vehicle-mounted sound output signals, the equalizer gain parameters are gains of all the filters, and the gain adjusting module adjusts the gains of the equalizer based on the gains of all the filters and correction thresholds corresponding to all the filters.
The invention has the following advantages:
1. The method comprises the steps of collecting output signals of the vehicle-mounted sound equipment, calculating differences between the output signals and original signals, generating audio compensation signals, loading the audio compensation signals on the equalizer, compensating the output signals of the vehicle-mounted sound equipment by using the equalizer, compensating distortion and loss in a signal transmission process, and improving listening experience of people.
2. By setting the acquisition time of the audio signal and considering the delay of the vehicle-mounted sound system, the acquisition time of the original audio signal is corrected, and the acquisition accuracy is improved.
3. After the gain of the equalizer is initialized, the change of the adjusting action of the equalizer is detected by a periodic self-checking mode, the adjusting action of the equalizer is corrected, and the adjusting effect of the equalizer is prevented from being deteriorated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an adaptive equalizer compensation method for a vehicle audio according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an adaptive equalizer compensation system for a vehicle audio according to an embodiment of the present invention.
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
Example 1
Referring to fig. 1, embodiment 1 of the present invention provides an adaptive equalizer compensation method for a vehicle audio, including the following steps:
S11, acquiring an audio signal to be detected, loading original audio to a vehicle-mounted sound system, playing through the vehicle-mounted sound system, and collecting a sound signal output by the vehicle-mounted sound system by utilizing a microphone to obtain the audio signal to be detected;
In the step, sound signals generated by the vehicle-mounted sound equipment are collected for a plurality of times through a microphone according to a certain time interval, specifically, the collection starting time, the interval duration t and the collection times are set, the collection times are 10 times in the embodiment, the original audio is loaded on the vehicle-mounted sound equipment system, after the original audio is played, the first collection of the sound signals generated by the vehicle-mounted sound equipment is started when the original audio reaches the collection starting time, the second collection is performed after the interval duration t, and the collection is stopped after the collection times are reached, so that ten groups of audio signals to be detected are obtained;
S12, analyzing the audio signal to be detected, and analyzing and processing the audio signal to be detected by using a filter to obtain a smooth audio signal to be detected;
S13, generating an audio compensation signal, comparing the smooth audio signal to be detected with an original audio signal corresponding to the original audio, and generating the audio compensation signal according to the difference of the smooth audio signal to be detected and the original audio signal;
in the step, ten groups of original audio signals corresponding to ten groups of collected audio signals to be tested one by one are intercepted from the original audio according to the collection starting time, the interval time t and the vehicle playing delay time, specifically, the collection starting time is obtained by subtracting the playing delay time from the collection starting time, the original audio signals are collected at the actual collection starting time, the ten groups of original audio signals are obtained by multiple collection according to the interval time t, the smooth audio signals to be tested are respectively compared with the corresponding original audio signals, and ten groups of audio compensation signals are generated according to the difference of the two signals
S14, audio signal compensation, namely loading an audio compensation signal to an equalizer, and compensating an output signal of the vehicle-mounted sound through the equalizer;
Specifically, gain parameters corresponding to ten groups of audio compensation signals are calculated based on parameters of the equalizer, an average value of the ten groups of gain parameters is taken, the equalizer is adjusted according to the average value of the gain parameters, and gain initialization of the equalizer is completed.
The equalizer is composed of m filters, the larger m is, the more accurate the compensation of the audio signal is, the sound frequency range which can be sensed by normal human ears is 20-20kHz, in the embodiment, m is preferably 8, the frequency range is divided into 8 categories, specifically, eight frequency categories of ultralow frequency 20-40Hz, low frequency 40-150Hz, medium and low frequency 150-500Hz, medium frequency 500-2kHz, medium and high frequency 2K-5kHz, sub-high frequency 5K-8kHz, high frequency 8K-12kHz and ultrahigh frequency 12K-20K, each frequency category corresponds to one filter, and the 8 filters form the equalizer in the embodiment, and all the 8 filters are band-pass filters.
In an alternative embodiment, there may be a suitable overlap between the pass bands of the individual filters in order to make the equalizer's adjustment to the original audio signal smoother.
The audio compensation signal is embodied by the distortion and loss of the audio signal after the original audio signal is played, specifically, the defect of loudness on each frequency band is solved, the gains corresponding to each filter are calculated according to the audio compensation signal, the center frequency of each filter in the equalizer and the passband, the equalizer is set, the original audio signal with the distortion and loss after being played by the vehicle-mounted sound is compensated by the equalizer, the distortion and loss of the audio signal brought by the vehicle-mounted sound are compensated by the equalizer, the effect of correcting the frequency distortion and the propagation loss generated by the vehicle-mounted sound is achieved, and the experience of people listening to music by the vehicle-mounted sound in the traveling process is improved.
Example 2
On the basis of embodiment 1, embodiment 2 of the present invention provides an adaptive equalizer compensation method for a vehicle-mounted audio, and after the gain initialization of an equalizer is completed, the equalizer is adjusted by the following method:
s21, detecting an output signal, and detecting a compensated vehicle-mounted sound output signal by using an audio signal detector;
S22, comparing the signal with the audio signal being played, and calculating a gain compensation signal;
s23, correction judgment, namely calculating the gain of each filter according to the gain compensation signal and the actual parameters of the equalizer, judging whether the gain of each filter is equal to or greater than a corresponding correction threshold value, if so, correcting, otherwise, not correcting;
Wherein each filter in the equalizer is provided with an individual correction threshold, and the correction threshold of each filter is set separately in consideration of the fact that the change of the feeling given to people after the audio signals of different frequencies change the same loudness.
In the actual calculation process, it is difficult to accurately calculate the gain compensation signal, and in consideration of the calculated error, when it is detected that the gain of a certain filter is smaller than the correction threshold, correction is not performed, and only when it is equal to or larger than the correction threshold, correction is performed.
In an alternative embodiment, the automatic detection interval duration may be set, and when the playing time of the vehicle audio reaches the automatic detection interval duration, the audio being played is detected, and the gain compensation signal of each audio is calculated in real time, which may bring heavy calculation tasks, so that periodic self-checking may be set to prevent the gain effect of the equalizer from being reduced.
In an alternative embodiment, in order to improve the accuracy of each self-test and reduce the error, a plurality of output signals can be obtained in the process of each self-test, the average gain of the plurality of output signals is calculated, and the average gain is compared with the correction threshold value, so that the self-test of the equalizer is realized, the adjustment effect of the equalizer is prevented from being reduced, and the adjustment effect is deteriorated.
Example 3
On the basis of embodiment 1 and embodiment 2, embodiment 3 of the present invention also provides an adaptive equalizer compensation system for a car audio,
The adaptive equalizer compensation system of the vehicle-mounted sound equipment comprises:
The signal acquisition module is used for acquiring output signals of the vehicle-mounted sound equipment and is configured as a microphone;
The signal analysis module is used for analyzing the output signal and analyzing and processing the audio signal to be detected by utilizing the filter;
the signal generation module is used for generating an audio compensation signal, comparing the output signal of the vehicle-mounted sound with a corresponding original audio signal, and calculating and generating the audio compensation signal;
The gain calculation module is used for calculating gain parameters of the equalizer and calculating the gain parameters of the equalizer according to the audio compensation signal and the equalizer parameters;
And the control module is used for: for adjusting the gain variation of the equalizer.
Still further, the adaptive equalizer compensation system of the in-vehicle audio further includes:
And a self-checking module: for detecting the adjustment of the equalizer periodically;
Gain adjustment module: for adjusting the gain of the equalizer.
The self-checking module is used for periodically detecting the gain effect of the equalizer, namely, the gain parameter of the equalizer corresponding to the output signal of the vehicle-mounted sound is calculated through the signal acquisition module, the signal analysis module, the signal generation module and the gain calculation module under the set detection time, namely, the gain parameter corresponding to each filter is obtained, the gain effect of the equalizer is obtained, and the gain adjustment module is used for completing the adjustment of the gain of the equalizer according to the relation between the gain parameter of the equalizer and a preset correction threshold value, specifically, when the gain of a certain filter is smaller than the correction threshold value, the gain of the equalizer is not adjusted, and when the gain of the equalizer is equal to or larger than the correction threshold value, the gain of the equalizer is adjusted.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (2)
1. The adaptive equalizer compensation method of the vehicle-mounted sound equipment is characterized by comprising the following steps of:
S11, acquiring a signal, namely acquiring a sound signal output by a vehicle-mounted sound device by utilizing sound acquisition equipment to obtain a first detection signal;
s12, signal analysis, namely analyzing and processing the first detection signal by using a filter to obtain a second detection signal;
s13, signal generation, namely calculating and generating an audio compensation signal according to the second detection signal and the original audio signal;
S14, signal compensation, namely loading the audio compensation signal to an equalizer, and compensating an output signal of the vehicle-mounted sound by using the equalizer;
The equalizer consists of m filters, the sound frequency range of 20-20kHz is divided into m categories, and each category corresponds to one filter;
The m filters are bandpass filters, and overlapping parts exist in the pass bands of the m bandpass filters; in the step S14, gain parameters corresponding to the audio compensation signal are calculated based on the parameters of the equalizer, and the equalizer is adjusted based on the average value of the gain parameters, so as to complete the gain initialization of the equalizer;
After the gain initialization of the equalizer is completed, the equalizer is adjusted by adopting the following steps:
S21, detecting an output signal, and detecting a compensated vehicle-mounted sound output signal by using an audio signal detection device;
S22, comparing the detected compensated vehicle-mounted sound output signal with an original audio signal corresponding to the compensated vehicle-mounted sound output signal, and calculating a gain signal of the original audio signal corresponding to the compensated vehicle-mounted sound output signal;
S23, correcting and judging, namely calculating the gain of each filter according to the gain signal of the original audio signal and the parameters of the equalizer in the step S22, judging whether the gain is larger than or equal to a preset threshold value, if so, adjusting the target filter, otherwise, not adjusting the target filter;
for the step S22, calculating gain signals of the original audio signals corresponding to the compensated vehicle-mounted audio output signals, which are average gains of the gain signals of the original audio signals corresponding to the plurality of compensated vehicle-mounted audio output signals;
for the step S23, each filter is set with a different preset threshold;
the method comprises the steps that the audio signal detection device is used for detecting a compensated vehicle-mounted sound output signal, the method is executed at a preset time point, and the audio signal detection device is used for detecting the compensated vehicle-mounted sound output signal when the playing duration of the vehicle-mounted sound reaches the preset duration;
In the step S11, the original audio is played by using the vehicle-mounted audio system, a first detection signal is collected for the first time at a first preset time point, and the next collection is performed after a preset collection interval, and the collection is stopped after a preset number of first detection signals are collected;
In the step S12, the filter is used to analyze the first detection signals to obtain a preset number of first detection signals;
The first preset time point is a time point corresponding to the time point when the original audio playing time length is t;
The step S13 further includes: intercepting the original audio signals for the first time at a second preset time point, intercepting the original audio signals for the next time after the preset acquisition interval, and stopping intercepting after intercepting the preset number of the original audio signals;
the second preset time point is obtained by subtracting the play time delay from the first preset time point;
For the step S14, further includes: and calculating gain parameters corresponding to the preset number of audio compensation signals based on the parameters of the equalizer, taking the average value of the gain parameters, and adjusting the equalizer based on the average value of the gain parameters to finish the gain initialization of the equalizer.
2. An adaptive equalizer compensation system for a car audio, for implementing the adaptive equalizer compensation method for a car audio according to claim 1, wherein the adaptive equalizer compensation system for a car audio comprises:
the signal acquisition module is used for acquiring output signals of the vehicle-mounted sound equipment;
The signal analysis module is used for analyzing and processing the output signals of the acquired vehicle-mounted sound equipment;
The signal generation module is used for calculating and generating an audio compensation signal corresponding to the output signal of the vehicle-mounted sound equipment;
The gain calculation module is used for calculating gain parameters of the equalizer;
the control module is used for adjusting the gain of the equalizer according to the gain parameter of the equalizer;
further comprises: and a self-checking module: for periodic self-checking of the equalizer's tuning action;
gain adjustment module: for adjusting the gain of the equalizer;
The self-checking module periodically calculates equalizer gain parameters corresponding to the vehicle-mounted sound output signals, the equalizer gain parameters are gains of all the filters, and the gain adjusting module adjusts the gains of the equalizer based on the gains of all the filters and correction thresholds corresponding to all the filters.
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| TWI715070B (en) * | 2019-06-20 | 2021-01-01 | 原相科技股份有限公司 | Electronic device and equalizer adjustment method according to volume thereof |
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| CN1573930A (en) * | 2003-06-12 | 2005-02-02 | 阿尔派株式会社 | Speech correction apparatus |
| CN101359902A (en) * | 2008-09-25 | 2009-02-04 | 炬才微电子（深圳）有限公司 | Equalizing method and system for audio signal |
| JP2016012923A (en) * | 2015-07-29 | 2016-01-21 | パナソニックＩｐマネジメント株式会社 | On-vehicle audio reproduction device |
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