CN111526455A - Correction enhancement method and system for vehicle-mounted sound - Google Patents
Correction enhancement method and system for vehicle-mounted sound Download PDFInfo
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Abstract
The invention provides a correction enhancement method and a correction enhancement system for a vehicle-mounted sound system, wherein a test audio file is played through at least two loudspeakers, and the played sound is recorded at a preset position to obtain a recording audio file; performing signal processing on the recording audio file to obtain the relative delay of each loudspeaker at the preset position and the transfer function of each loudspeaker; and adjusting the output time delay of each loudspeaker based on the relative delay of each loudspeaker so that each loudspeaker synchronously sounds relative to the preset position, and correcting the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound. The correction enhancement method and the system of the vehicle-mounted sound system correct the time delay of each loudspeaker of the vehicle-mounted sound system, so that each loudspeaker can be heard at the appointed position and pronounce simultaneously; the frequency response is corrected within the limits of the loudspeaker to make the frequency response of the loudspeaker as flat as possible and restore the truest sound.
Description
Technical Field
The invention relates to the field of sound processing, in particular to a correction and enhancement method and system for a vehicle-mounted sound box.
Background
The vehicle-mounted sound system is a sound system installed in a vehicle and comprises software, media, a sound source, a preceding stage signal control, a power amplification mechanism, a loudspeaker and a transmission mechanism. Although the audio equipment is only an auxiliary equipment for the automobile and has no influence on the running performance of the automobile, as the demand for enjoyment of people is higher and higher, automobile manufacturers increasingly pay more attention to the audio equipment of the car and use the audio equipment as one of the bases for evaluating the comfort of the automobile.
Generally, a car audio system includes a plurality of speakers, each speaker is disposed at a different position in a car, and thus, sounds emitted from the speakers do not arrive at the same time to people in the car. Therefore, how to ensure that the speakers heard at the predetermined positions all sound at the same time and the frequency response is as flat as possible has become one of the problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a method and a system for enhancing correction of car audio, which are used to solve the problem of poor customer experience of car audio systems in the prior art.
In order to achieve the above and other related objects, the present invention provides a method for correcting and enhancing a car audio system, comprising:
playing a test audio file through at least two loudspeakers, and recording played sound at a preset position to obtain a recording audio file;
performing signal processing on the recording audio file to obtain the relative delay of each loudspeaker at the preset position and the transfer function of each loudspeaker;
and adjusting the output time delay of each loudspeaker based on the relative delay of each loudspeaker so that each loudspeaker synchronously sounds relative to the preset position, and correcting the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound.
Optionally, the test audio file comprises a stereo or multi-channel sound signal, and only one channel of the test audio file is sounded at a time.
More optionally, the step of obtaining the relative delay of each speaker comprises: the loudspeakers corresponding to different sound channels respectively play sine wave signals with the same period and the same frequency in sequence, and the loudspeakers corresponding to different sound channels are compared at the same position of the sine wave signals in the recording audio file at the preset position so as to determine the relative delay of each loudspeaker; the same position of the sine wave signal comprises a position corresponding to a wave crest, a wave trough or a preset amplitude.
More optionally, the test audio file is a full-band audio file.
More optionally, the full-band audio file includes white noise.
Optionally, the step of modifying the frequency response of each speaker comprises: solving a correction function H1(z), and flattening the frequency response of each loudspeaker through the correction function H1(z), wherein the following relational expression is satisfied:
H(z)*H1(z)＝1，
wherein H (z) is the fitted loudspeaker transfer function; h1(z) is a correction function, and the poles of the correction function are within the unit circle.
More optionally, a minimum phase method is used to ensure that the poles of the correction function are within the unit circle.
More optionally, the step of modifying the frequency response of each speaker further comprises: filtering the low frequency and the high frequency of the transfer function by adopting a bypass filter, and correspondingly replacing the transfer function before filtering with the transfer function H '(z) after filtering to remove the sound frequency points which are not required to be processed, thereby obtaining a new correction function H1' (z), and meeting the following relational expression:
H’(z)＝H(z)+Hlp(z)+Hhp(z)，
H'(z)*H1'(z)＝1，
wherein H (z) is the fitted transfer function; hlp(z) is the low-pass filtered transfer function; hhp(z) is the high-pass filtered transfer function.
To achieve the above and other related objects, the present invention provides a correction enhancement system for a car audio, comprising:
the audio processing module is used for receiving a test audio file and executing the correction and enhancement method of the vehicle-mounted sound equipment;
the at least two loudspeakers are connected with the audio processing module and are used for playing the audio signals output by the audio processing module;
and the recording equipment is connected with the audio processing module, records the sound played by each loudspeaker to obtain a recording audio file, and transmits the recording audio file to the audio processing module.
Optionally, the audio processing module includes a delay adjusting unit, a modifying unit and a signal processing unit, which are in one-to-one correspondence with each speaker;
each time delay adjusting unit is connected with the corresponding sound channel and used for adjusting the output time delay of each loudspeaker;
each correcting unit is respectively connected between the corresponding time delay adjusting unit and the loudspeaker and is used for correcting the frequency response of each loudspeaker;
the signal processing unit is connected with each time delay adjusting unit and each correcting unit and is used for controlling each time delay adjusting unit and each correcting unit to finish output time delay control and frequency response correction.
As described above, the correction enhancement method and system for in-vehicle audio according to the present invention have the following advantageous effects:
1. the correction enhancement method and the system for the vehicle-mounted sound system correct the time delay of each loudspeaker of the vehicle-mounted sound system, so that each loudspeaker can be heard at the appointed position and pronounce simultaneously.
2. The correction and enhancement method and the correction and enhancement system for the vehicle-mounted sound system correct the frequency response within the limit range of the loudspeaker, so that the frequency response of the loudspeaker is as flat as possible, and the truest sound is restored.
Drawings
Fig. 1 is a flowchart illustrating a correction enhancement method for a car audio according to the present invention.
Fig. 2 is a schematic diagram illustrating the principle of removing unnecessary audio frequency points according to the present invention.
Fig. 3 is a schematic diagram illustrating the structure and principle of the filter circuit according to the present invention.
Fig. 4 is a schematic structural diagram of a correction enhancement system for a car audio according to the present invention.
FIG. 5 is a schematic diagram of an audio processing module and audio data streams according to the present invention.
Description of the element reference numerals
1 Audio processing module
11 time delay adjusting unit
12 correction unit
13 Signal processing unit
21-26 speaker
S1-S6
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 5. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Example one
As shown in fig. 1, the present embodiment provides a correction and enhancement method for a car audio system, where the correction and enhancement method includes:
playing a test audio file through at least two loudspeakers, and recording played sound at a preset position to obtain a recording audio file;
performing signal processing on the recording audio file to obtain the relative delay of each loudspeaker at the preset position and the transfer function of each loudspeaker;
and adjusting the output time delay of each loudspeaker based on the relative delay of each loudspeaker so that each loudspeaker synchronously sounds relative to the preset position, and correcting the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound.
The correction enhancement method for the vehicle-mounted sound equipment in the embodiment specifically comprises the following steps:
s1: firstly, a preset position in the vehicle is determined, and the subsequent adjustment is based on the best hearing sense of the preset position, so that the preset position can be called a golden position.
Specifically, the preset position is set as an ear position corresponding to the primary driver, an ear position corresponding to the secondary driver, an ear position corresponding to the rear passenger, or any other position, which is not limited in this embodiment.
S2: and then, playing a specific test audio file, playing the audio of the corresponding sound channel in the test audio file by each loudspeaker, and recording the sound played by each loudspeaker at the preset position to obtain a recording audio file.
In particular, the test audio file includes, but is not limited to, a stereo or multi-channel sound signal, and only one channel of the test audio file is sounded at a time.
As an example, the test audio file is a full-band audio file. In this embodiment, the test audio file is white noise, and in actual use, any full-band audio file may be used, which is not limited to this embodiment.
S3: and then calculating the relative time delay of each loudspeaker based on the signal waveform corresponding to each loudspeaker in the audio file.
Specifically, the speakers corresponding to different sound channels respectively play sine wave signals with the same period and the same frequency in sequence, and the speakers corresponding to different sound channels are compared at the same position of the sine wave signals in the recording audio file at the preset position, so as to determine the relative delay of each speaker. As an example, in this embodiment, based on that a stereo signal (including a left channel and a right channel) plays a sine wave (sin) of 400hz for 10 cycles first at a speaker corresponding to a left front channel, and plays a sine wave (sin) of 400hz for 10 cycles at a speaker corresponding to a right front channel after 1s, comparing peak (vertex) positions of the sine waves received twice in the recorded audio file, a relative time delay of the speaker corresponding to the right front channel with respect to the speaker corresponding to the left front channel can be calculated; similarly, the file is adopted to test the audio file, the loudspeaker corresponding to the front left channel and the loudspeaker corresponding to the middle left channel are respectively played and recorded, and the relative time delay of the loudspeaker corresponding to the middle left channel relative to the loudspeaker corresponding to the front left channel can be tested; in the same method, the relative time delay of each loudspeaker in the whole vehicle can be obtained by testing each other loudspeaker in the vehicle by taking the loudspeaker corresponding to the left front channel as a reference; the speaker corresponding to which channel is used as a reference can be set based on actual needs, and is not limited to this embodiment. Or the relative time delay between the speakers corresponding to each pair of channels may be calculated, and then the relative time delay of each speaker may be calculated based on one of the speakers, so as to obtain the relative time delay of each speaker, which is not limited in this embodiment. As another example, the sinusoidal signals with fixed frequency may be sequentially played at each speaker based on the multi-channel signals, and then the relative delay of each speaker is determined based on the comparison of the same position of the sinusoidal signals corresponding to each speaker, which is not repeated herein.
It should be noted that, in the present embodiment, the sine wave signals played by each channel have the same period and the same frequency, so as to ensure the accuracy of the comparison at the same position. In this embodiment, the peak of the sine wave signal is used as the same position to perform the comparison of the relative time delays, and in practical use, the same position of the sine wave signal includes the peak, the trough or other positions corresponding to the preset amplitudes (for example, the position corresponding to the amplitude of 0.1V on the side where the amplitude gradually increases in the signal waveform), which is not repeated herein.
S4: and then fitting out a transfer function of a corresponding loudspeaker based on the test audio file and the recording audio file.
Specifically, it is assumed that the electrical signal of the test audio file is a sequence of x (0), x (1) … x (n), and the electrical signal of the recorded audio file is a sequence of y (0), y (1) … y (n), and the relationship therebetween can be expressed as:
wherein the content of the first and second substances,
namely, the transfer function h (z) of the corresponding speaker, the transfer function h (z) of the speaker satisfies the following relation:
specifically, the transfer function h (z) is obtained by an impulse function method, an adaptive filter approximation method, a wiener filtering method, or a matlab calculation method.
As an example, the specific method for obtaining the transfer function h (z) by using the impact function method includes: and playing a shock function and simultaneously recording to obtain the transfer function H (z).
As an example, a specific method for obtaining the transfer function h (z) by using an adaptive filter approximation method includes: playing a white noise and recording at the same time, recording the played sound signal as x (n), recording the recorded signal as d (n), and obtaining an approximation signal y (n) by approximating the played sound signal by using an LMS, NLMS or RLS algorithm according to x (n) and d (n), so that the variance of y (n) -d (n) is minimum, and the last group of parameters of the obtained FIR is the transfer function H (z).
As an example, the specific method for obtaining by using matlab calculation includes: the transfer function H (z) can be obtained by using ARX modeling and then converging in a recursive linear quadratic form mode, namely, the transfer function H (z) is obtained by using tfest of matlab for modeling and recursion.
It should be noted that any transfer function h (z) that can be obtained is applicable to the present invention, and is not limited to the examples listed in this embodiment.
S5: adjusting the output delays of the speakers based on the relative delays of the speakers so that the speakers sound synchronously with respect to the preset position.
Specifically, according to the relative delay of each speaker, the output time delay of other speakers is adjusted by taking one of the speakers as a reference, so that the sound played by each speaker reaches the preset position at the same time, and further, synchronous sound production is realized. In this embodiment, the output delays of the speakers are adjusted based on the minimum delay, so that the delays of the speakers reaching the golden position are consistent.
S6: and modifying the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound.
Specifically, for high fidelity reproduction of the original sound, a flat transfer function H (z) × H1(z) ═ 1 must be obtained, where H (z) is the fitted loudspeaker transfer function; h1(z) is a correction function. The modification function H1(z) is the reciprocal of the transfer function H (z), i.e. satisfies
This is the best. However, due to the system stability requirements, it is necessary to ensure that the pole of the correction function H1(z) is within the unit circle, and in this embodiment, the minimum phase method is used to ensure that the pole of the correction function is within the unit circle. Suppose (z)2+ a1 + z + a2) outside the unit circle, and processed by the minimum phase method to obtain (a2 + z)2+ a1 × z + 1); poles other than the remaining zeros are treated in the same way.
The frequency response curve fitted in this way has a great amplification factor on high frequency and low frequency, and as an implementation mode of the invention, the frequency points of sound which are not required to be processed can be further removed. The sound frequency points which are not to be processed can be set with a fixed value or a threshold value to find out the frequency spectrum of the part which can not be processed. As shown in fig. 2, when the frequency is greater than fc2 or less than fc1, the played gain is less than the threshold, which indicates that the speaker cannot play the part of the frequency, and the modification is also white modification, but it is easy to break the sound, and wastes energy, so the sound of the frequency can not be processed. Such asFIG. 3 shows a high-pass filter H with bypass designed according to the frequency pointshp(z) and a low-pass filter Hlp(z) such that H' (z) ═ H (z) + Hlp(z)+HhpAnd (z) removing unnecessary high and low frequency components. And replacing the corresponding transfer function H (z) with the filtered transfer function H '(z), and satisfying H' (z) × H1'(z) ═ 1, thereby obtaining a correction function H1' (z) from which high and low frequency components are removed. The frequency response of each speaker is corrected based on the correction function H1' (z) from which high and low frequency components are removed so that the frequency response of each speaker is as flat as possible, restoring the most realistic sound.
It should be noted that the sequence of the steps is not limited to the example, S3, S5, S4 and S6 may be sequentially executed after S1 and S2 are executed in actual use, S4, S6, S3 and S5 may be sequentially executed, or S4, S3, S5 and S6 may be sequentially executed, which is not described herein in detail, and any logical sequence is applicable to the present invention.
The correction and enhancement method of the vehicle-mounted sound system can obtain the best hearing sense at the preset position, and obtains the truest sound through the correction frequency response reduction, so that the customer experience degree is greatly improved.
Example two
As shown in fig. 4, the present embodiment provides a correction enhancement system for a car audio, including: the system comprises an audio processing module 1, at least two loudspeakers and recording equipment.
As shown in fig. 4, in the present embodiment, the number of speakers is set to 6, which are respectively the first speaker 21, the second speaker 22, the third speaker 23, the fourth speaker 24, the fifth speaker 25 and the sixth speaker 26, and the number of speakers may be set as needed in actual use, which is not limited to the present embodiment. The loudspeakers are located at different (including partially different or completely different) sound channels, and are connected to the audio processing module 1, and are configured to play audio signals output by the audio processing module 1.
As shown in fig. 4, the recording device (not shown) is connected to the audio processing module 1, records sound played by each speaker to obtain a recorded audio file, and transmits the recorded audio file to the audio processing module 1.
Specifically, any device having a recording function is suitable for the recording apparatus of the present invention, and is not described herein again.
As shown in fig. 4, the audio processing module 1 receives a test audio file and is connected to the recording device, so as to execute the correction and enhancement method for car audio according to the first embodiment.
Specifically, as shown in fig. 5, in the present embodiment, the audio processing module 1 includes a delay adjusting unit 11, a modifying unit 12 and a signal processing unit 13, which are in one-to-one correspondence with each speaker. The signal processing unit 13 is connected to each delay adjusting unit 11 and the correcting unit 12, and the signal processing unit 3 completes calculation of the relative delay of each speaker and the transfer function of each speaker, and outputs a control parameter to control each delay adjusting unit 11 and the correcting unit 12 to complete output delay control and correction of frequency response. Each delay adjusting unit 11 (respectively denoted as a first delay adjusting unit, a second delay adjusting unit, a third delay adjusting unit, a fourth delay adjusting unit, a fifth delay adjusting unit, and a sixth delay adjusting unit) is connected to a corresponding sound channel, and is configured to adjust an output delay of each speaker, in this embodiment, the test audio file is a stereo signal (including a digital signal or an analog signal) and includes a left sound channel and a right sound channel, the left sound channel and the right sound channel are respectively connected to the three delay adjusting units 11, and the output delay of each speaker is adjusted based on a delay control signal output by the signal processing unit 3. Each of the correction units 12 (respectively referred to as a first, a second, a third, a fourth, a fifth, and a sixth correction unit) is connected between the corresponding delay adjustment unit 11 and the speaker, and corrects the frequency response of each speaker based on the correction parameter output by the signal processing unit 13.
As another implementation manner of the present invention, the signal processing unit 13 further includes a filter circuit, as shown in fig. 3, the filter circuit includes a high-pass filter Hhp(z) Low pass Filter Hlp(z) and a pass filter h (z); the high-pass filter Hhp(z) the low-pass filter Hlp(z) and the pass-through filter h (z) are connected in parallel to remove the audio frequency points that are not to be corrected.
As an example, the audio processing module 1 is implemented by using a CPU or a DSP mounted on a vehicle.
In summary, the present invention provides a correction enhancement method and system for a car audio, wherein a test audio file is played through at least two speakers, and the played sound is recorded at a preset position to obtain a recorded audio file; performing signal processing on the recording audio file to obtain the relative delay of each loudspeaker at the preset position and the transfer function of each loudspeaker; and adjusting the output time delay of each loudspeaker based on the relative delay of each loudspeaker so that each loudspeaker synchronously sounds relative to the preset position, and correcting the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound. The correction enhancement method and the system of the vehicle-mounted sound system correct the time delay of each loudspeaker of the vehicle-mounted sound system, so that each loudspeaker can be heard at the appointed position and pronounce simultaneously; the frequency response is corrected within the limits of the loudspeaker to make the frequency response of the loudspeaker as flat as possible and restore the truest sound. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A correction and enhancement method for a car audio system is characterized by at least comprising the following steps:
playing a test audio file through at least two loudspeakers, and recording played sound at a preset position to obtain a recording audio file;
performing signal processing on the recording audio file to obtain the relative delay of each loudspeaker at the preset position and the transfer function of each loudspeaker;
and adjusting the output time delay of each loudspeaker based on the relative delay of each loudspeaker so that each loudspeaker synchronously sounds relative to the preset position, and correcting the frequency response of each loudspeaker based on the transfer function of each loudspeaker to restore the real sound.
2. The correction enhancement method for the car audio according to claim 1, characterized in that: the test audio file comprises a stereo or multi-channel sound signal, and only one channel in the test audio file sounds at the same time.
3. The correction enhancement method for the car audio according to claim 2, characterized in that: the step of obtaining the relative delay of each loudspeaker comprises: the loudspeakers corresponding to different sound channels respectively play sine wave signals with the same period and the same frequency in sequence, and the loudspeakers corresponding to different sound channels are compared at the same position of the sine wave signals in the recording audio file at the preset position so as to determine the relative delay of each loudspeaker; the same position of the sine wave signal comprises a position corresponding to a wave crest, a wave trough or a preset amplitude.
4. The correction enhancement method for the car audio according to any one of claims 1 to 3, characterized in that: the test audio file is a full-band audio file.
5. The correction enhancement method for the car audio according to claim 4, wherein: the full-band audio file includes white noise.
6. The correction enhancement method for the car audio according to claim 1, characterized in that: the step of modifying the frequency response of each loudspeaker comprises: solving a correction function H1(z), and flattening the frequency response of each loudspeaker through the correction function H1(z), wherein the following relational expression is satisfied:
H(z)*H1(z)＝1，
wherein H (z) is the fitted loudspeaker transfer function; h1(z) is a correction function, and the poles of the correction function are within the unit circle.
7. The correction enhancement method for the car audio according to claim 6, characterized in that: the minimum phase method is used to ensure that the poles of the correction function are within the unit circle.
8. The correction enhancement method for the car audio according to claim 6, characterized in that: the step of modifying the frequency response of each speaker further comprises: filtering the low frequency and the high frequency of the transfer function by adopting a bypass filter, and correspondingly replacing the transfer function before filtering with the transfer function H '(z) after filtering to remove the sound frequency points which are not required to be processed, thereby obtaining a new correction function H1' (z), and meeting the following relational expression:
H’(z)＝H(z)+Hlp(z)+Hhp(z)，
H'(z)*H1'(z)＝1，
wherein H (z) is the fitted transfer function; hlp(z) is the low-pass filtered transfer function; hhp(z) is the high-pass filtered transfer function.
9. A correction enhancement system for a car audio, characterized by comprising at least:
an audio processing module, which receives a test audio file and is used for executing the correction and enhancement method of the vehicle-mounted sound equipment according to any one of claims 1-8;
the at least two loudspeakers are connected with the audio processing module and are used for playing the audio signals output by the audio processing module;
and the recording equipment is connected with the audio processing module, records the sound played by each loudspeaker to obtain a recording audio file, and transmits the recording audio file to the audio processing module.
10. The correction enhancement system for car audio according to claim 9, characterized in that: the audio processing module comprises a time delay adjusting unit, a correcting unit and a signal processing unit which are in one-to-one correspondence with each loudspeaker;
each time delay adjusting unit is connected with the corresponding sound channel and used for adjusting the output time delay of each loudspeaker;
each correcting unit is respectively connected between the corresponding time delay adjusting unit and the loudspeaker and is used for correcting the frequency response of each loudspeaker;
the signal processing unit is connected with each time delay adjusting unit and each correcting unit and is used for controlling each time delay adjusting unit and each correcting unit to finish output time delay control and frequency response correction.
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| CN113993057A (en) * | 2021-10-25 | 2022-01-28 | 浙江德清知路导航科技有限公司 | Sound field self-adaption system, method and storage medium based on audio real-time positioning technology |
| WO2023087774A1 (en) * | 2021-11-17 | 2023-05-25 | 中国第一汽车股份有限公司 | Electric vehicle's low-speed pedestrian alert sound design method and system, and terminal and storage medium |
| CN117119358A (en) * | 2023-10-17 | 2023-11-24 | 武汉市聚芯微电子有限责任公司 | Compensation method and device for sound image offset side, electronic equipment and storage equipment |
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