CN110913325A - Automatic tuning method, related device and readable storage medium - Google Patents

Automatic tuning method, related device and readable storage medium Download PDF

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Publication number
CN110913325A
CN110913325A CN201911173081.4A CN201911173081A CN110913325A CN 110913325 A CN110913325 A CN 110913325A CN 201911173081 A CN201911173081 A CN 201911173081A CN 110913325 A CN110913325 A CN 110913325A
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frequency response
response curve
target
frequency
loudspeaker
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焦扬
吕思南
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iFlytek Co Ltd
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iFlytek Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved

Abstract

The application discloses an automatic tuning method, related equipment and a readable storage medium, wherein an actually measured frequency response curve of a position to be tuned is obtained according to a frequency response of an audio signal which is recorded by a microphone and output by a loudspeaker according to a first filtering parameter; and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signal output by the loudspeaker with the second filter parameters reaches the preset sound effect corresponding to the target frequency response curve at the position. In the above scheme, the frequency response curve of this position can be confirmed through the frequency response of microphone record, need not to use audio test instrument manual measurement, moreover, can be based on the difference of actual measurement frequency response curve and target frequency response curve, the automatic filter parameter adjustment with the speaker is the second filter parameter, consequently, has higher tuning efficiency.

Description

Automatic tuning method, related device and readable storage medium
Technical Field
The present application relates to the field of natural language processing technologies, and in particular, to an automatic tuning method, a related device, and a readable storage medium.
Background
At present, all there is the demand of playing audio through sound system in scenes such as car, meeting room, cinema, studio, in order to make sound system can both reach preset the audio in different positions, before real application sound system, need carry out the timing to sound system.
Taking an automobile scene as an example, with the development of the automobile industry, more and more consumers select automobiles as transportation means, and with the upgrading of consumption, the rapid promotion of the internet of vehicles and the popularization of 5G, the automobiles become more intelligent and humanized, and the vehicle-mounted infotainment system gradually becomes the basic configuration of various vehicle types. The vehicle-mounted infotainment system plays various audios through the automobile sound box. However, because the interior space of the automobile is narrow and small, the environment is complex, the variety of structural members is wide, and the selectable installation positions of the speakers are limited, and in addition, because the seats installed in the interior of the automobile are generally positioned on two sides of the central axis of the automobile, the sound field constructed by the speakers cannot meet the requirements of users on listening experience. Taking the loudspeaker as an example of being positioned at the vehicle door, the low-frequency loudspeaker is arranged on the lower part of the inner side of the vehicle door, the high-frequency loudspeaker is arranged on the A, B pillar, and based on an original sound field constructed by the loudspeaker, a user can feel that a sound source comes from the feet; moreover, due to reflection of seats, door plates and glass in the automobile, reflection of the upper part of the automobile body is strong, reflection of the lower part of the automobile body is weak, and time difference between reflected sound and direct sound is short, so that a sound field constructed by the loudspeaker is disordered. Therefore, before the automobile sound system leaves the factory, the sound field constructed by the loudspeaker can enable different positions in the automobile to achieve the preset sound effect.
Disclosure of Invention
In view of the above-described problems, the present application is made to provide an automatic tuning method, a related device, and a readable storage medium. The specific scheme is as follows:
an automatic tuning method, comprising:
acquiring the frequency response of an audio signal which is recorded by a microphone and output by a loudspeaker according to a first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
acquiring an actually measured frequency response curve of a position to be tuned according to the frequency response of the audio signal output by the loudspeaker through the first filtering parameter recorded by the microphone;
and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the loudspeaker through the second filter parameters reach a preset sound effect corresponding to the target frequency response curve at the position.
Optionally, the obtaining, according to a frequency response of an audio signal output by a microphone with a first filtering parameter, a measured frequency response curve of a position to be tuned includes:
acquiring frequency responses of all single-frequency point signals in audio signals output by a loudspeaker through a first filtering parameter recorded by a microphone;
calculating the frequency response of each single-frequency point signal at the position according to the frequency responses of all single-frequency point signals in the audio signals output by the microphone according to the first filtering parameters of the loudspeaker;
and acquiring an actually measured frequency response curve of the position to be tuned according to the frequency responses of all the single-frequency point signals at the positions.
Optionally, the adjusting the filter parameter of the speaker to be a second filter parameter based on the difference between the measured frequency response curve and the target frequency response curve includes:
controlling an adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition;
and determining the filtering parameter of the adaptive filter when the actually measured frequency response curve is adjusted for the last time as the second filtering parameter.
Optionally, the controlling the adaptive filter to adjust the actually measured frequency response curve until a difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition includes:
and controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the frequency response of all frequency points in the adjusted frequency response curve and the corresponding target frequency response is within a preset range.
Optionally, the procedure of each adjustment of the adaptive filter is as follows:
comparing a frequency response curve to be adjusted with a target frequency response curve, and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve; the frequency response curve to be adjusted comprises the actually measured frequency response curve or a frequency response curve after the last adjustment adjacent to the current adjustment;
and controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, wherein in the frequency response curve after the adjustment, the difference between the frequency response of the target frequency point and the corresponding target frequency response is within a preset range.
Optionally, the comparing the frequency response curve to be adjusted with a target frequency response curve, and determining target frequency points at which the frequency response curve to be adjusted and the target frequency response curve have differences includes:
and comparing the frequency response curve to be adjusted with a target frequency response curve, and determining the frequency point corresponding to the wave crest in the frequency response curve to be adjusted and/or the frequency point corresponding to the wave trough.
Optionally, the controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after this adjustment includes:
controlling an adaptive filter to perform reverse compensation on frequency points corresponding to wave crests in the frequency response curve to be adjusted and/or frequency points corresponding to wave troughs to obtain the frequency response curve after the adjustment, wherein the difference between the frequency response of the frequency points corresponding to the wave crests in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range; and the difference between the frequency response of the frequency point corresponding to the wave trough in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range.
Optionally, the target sound system is a car sound.
An automatic tuning device comprising:
the acquisition unit is used for acquiring the frequency response of the audio signal which is recorded by the microphone and output by the loudspeaker with the first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
the actual measurement frequency response curve acquisition unit is used for acquiring an actual measurement frequency response curve of a position to be tuned according to the frequency response of the audio signal output by the microphone through the first filtering parameter of the loudspeaker;
and the automatic tuning unit is used for adjusting the filtering parameters of the loudspeaker into second filtering parameters based on the difference between the actual measurement frequency response curve and the target frequency response curve, so that the position of the loudspeaker with the audio signal output by the second filtering parameters reaches the preset sound effect corresponding to the target frequency response curve.
Optionally, the actually measured frequency response curve obtaining unit includes:
the frequency response acquisition unit of single frequency point signal: the device comprises a microphone, a first filter parameter and a second filter parameter, wherein the microphone is used for recording the audio signals output by the loudspeaker;
the calculating unit is used for calculating the frequency response of each single-frequency point signal at the position according to the frequency responses of all single-frequency point signals in the audio signals output by the microphone through the first filtering parameters of the loudspeaker;
and the actual measurement frequency response curve acquisition unit is used for acquiring the actual measurement frequency response curve of the position to be tuned according to the frequency response of all the single-frequency point signals at the position.
Optionally, the automatic tuning unit includes:
the frequency response curve adjusting unit is used for controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition;
and the second filter parameter determining unit is used for determining the filter parameter when the self-adaptive filter adjusts the actually measured frequency response curve for the last time as the second filter parameter.
Optionally, the frequency response curve adjusting unit includes:
and the frequency point frequency response adjusting unit is used for controlling the self-adaptive filter to adjust the actually measured frequency response curve until the difference between the frequency response of all frequency points in the adjusted frequency response curve and the corresponding target frequency response is within a preset range.
Optionally, the frequency point frequency response adjusting unit includes:
the target frequency point determining unit is used for comparing the frequency response curve to be adjusted with a target frequency response curve and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve; the frequency response curve to be adjusted comprises the actually measured frequency response curve or a frequency response curve after the last adjustment adjacent to the current adjustment;
and the target frequency point frequency response adjusting unit is used for controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, wherein in the frequency response curve after the adjustment, the difference between the frequency response of the target frequency point and the corresponding target frequency response is within a preset range.
Optionally, the target frequency point determining unit is specifically configured to:
and comparing the frequency response curve to be adjusted with a target frequency response curve, and determining the frequency point corresponding to the wave crest in the frequency response curve to be adjusted and/or the frequency point corresponding to the wave trough.
Optionally, the target frequency point frequency response adjusting unit includes:
the reverse compensation unit is used for controlling the adaptive filter to perform reverse compensation on the frequency points corresponding to the wave crests in the frequency response curve to be adjusted and/or the frequency points corresponding to the wave troughs to obtain the frequency response curve after the adjustment, wherein the difference between the frequency response of the frequency points corresponding to the wave crests in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range; and the difference between the frequency response of the frequency point corresponding to the wave trough in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range.
Optionally, the target sound system is a car sound.
An automatic tuning system comprising a memory and a processor;
the memory is used for storing programs;
the processor is used for executing the program and realizing the steps of the automatic tuning method.
A readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, carries out the steps of the method of auto-tuning as described above.
By means of the technical scheme, the application discloses an automatic tuning method, related equipment and a readable storage medium, wherein an actually measured frequency response curve of a position to be tuned is obtained according to a frequency response of an audio signal which is recorded by a microphone and output by a loudspeaker through a first filtering parameter; and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signal output by the loudspeaker with the second filter parameters reaches the preset sound effect corresponding to the target frequency response curve at the position. In the above scheme, the frequency response curve of this position can be confirmed through the frequency response of microphone record, need not to use audio test instrument manual measurement, moreover, can be based on the difference of actual measurement frequency response curve and target frequency response curve, the automatic filter parameter adjustment with the speaker is the second filter parameter, consequently, has higher tuning efficiency.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of an automatic tuning method according to an embodiment of the present disclosure;
fig. 2 is a schematic layout diagram of a speaker array in a vehicle according to an embodiment of the present disclosure;
fig. 3 is a schematic layout diagram of a microphone array in a vehicle according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of an automatic tuning method provided in an embodiment of the present application;
fig. 5 is a schematic flow chart of a method for obtaining an actually measured frequency response curve of a to-be-tuned location in a vehicle according to a frequency response of an audio signal output by a vehicle loudspeaker with a first filtering parameter, which is recorded by a vehicle microphone according to an embodiment of the present application;
fig. 6 is a schematic input/output diagram of a microphone array according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an application example of an automatic tuning method provided in the embodiment of the present application;
fig. 8 is a schematic structural diagram of an automatic tuning device according to an embodiment of the present application;
fig. 9 is a block diagram of a hardware structure of an automatic tuning system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart of an automatic tuning method according to an embodiment of the present application, where the method includes the following steps:
s101: acquiring the frequency response of an audio signal which is recorded by a microphone and output by a loudspeaker according to a first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
in the present embodiment, the speaker is a speaker provided in the target sound system; the microphone is a microphone provided in the target sound system. The target sound system may be a sound system provided in any scene (e.g., a car, a conference room, a movie theater, a studio, etc.). The microphone may test the frequency response of the audio signal output by the speaker and record it.
The frequency response is a frequency range in which the acoustic system reproduces and a frequency-dependent change in the amplitude of the sound wave. Generally, the detection index is referred to as a frequency amplitude of 1000Hz, and logarithms are represented by decibels (db) of the amplitude of the sound wave, and a sound pressure level can be represented by db, so that in the present application, a frequency response can be a sound pressure level of a signal at a single frequency point. The sound pressure level is obtained by multiplying 20 by a common logarithm of a ratio of the effective sound pressure to the reference sound pressure, and therefore, in the application, the frequency response can also be the sound pressure of a signal at a single frequency point.
S102: and acquiring an actually measured frequency response curve of the position to be tuned according to the frequency response of the audio signal output by the microphone through the first filtering parameter of the loudspeaker.
In this application, the position to be tuned may specifically be any position within a scene where the target sound system is set. Debugging personnel can send instructions to the tone processor, and the tone processor can determine the position to be tuned according to the received instructions.
In the method, after the position to be tuned is determined, the position to be tuned and the frequency response of the audio signal output by the first filtering parameter from the loudspeaker recorded by the microphone in the car are combined, a plurality of actually measured frequency responses of the position to be tuned are obtained through different algorithms, and an actually measured frequency response curve of the position to be tuned is obtained according to the plurality of frequency responses.
S103: and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the loudspeaker through the second filter parameters reach a preset sound effect corresponding to the target frequency response curve at the position.
In general, the specific preset sound effect depends on the listening requirement of the user in the scene where the target sound system is set. After the preset sound effect is determined, a target frequency response curve corresponding to the preset sound effect is set. The target frequency response curve can represent the relationship of each frequency to the frequency response.
In this application, the sound adjusting processor may adjust the filter parameter of the speaker to be a second filter parameter based on a difference between the measured frequency response curve and the target frequency response curve, and it should be noted that the audio signal output by the speaker with the second filter parameter can reach a preset sound effect corresponding to the target frequency response curve at the position.
The adjustment mode can be various, for example, the filtering parameters of the adaptive filter can be controlled and changed by the modulation processor in different modes, so as to change the measured frequency response curve. The present application is not limited to this.
The embodiment discloses an automatic tuning method, which includes the steps of obtaining an actually measured frequency response curve of a position to be tuned according to frequency responses of audio signals output by a loudspeaker through first filtering parameters and recorded by a microphone; and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signal output by the loudspeaker with the second filter parameters reaches the preset sound effect corresponding to the target frequency response curve at the position. In the above scheme, the frequency response curve of this position can be confirmed through the frequency response of microphone record, need not to use audio test instrument manual measurement, moreover, can be based on the difference of actual measurement frequency response curve and target frequency response curve, the automatic filter parameter adjustment with the speaker is the second filter parameter, consequently, has higher tuning efficiency.
The following describes the automatic tuning method according to the present application in detail, taking the target audio system as an example of a car audio.
At present, more and more vehicle models are equipped with vehicle infotainment systems, which have multiple audio functions (such as playing music, voice interaction, etc.), and when the audio functions of the vehicle infotainment systems operate, audio is generally played through a car stereo. In order to enable the sound field constructed by the speakers to achieve preset sound effects at different positions in the car, the speakers need to be adjusted according to different car models and different seat modes (such as a driver mode and a back-row VIP mode) before the car audio leaves a factory.
The frequency response curve refers to the increase or decrease of sound pressure generated by an electroacoustic device (such as a loudspeaker) along with the change of frequency when an audio signal output at a constant voltage is connected with a system (such as a car audio system), and is used for describing the curve of the associated change of the sound pressure and the frequency. The frequency response curve can reflect the frequency response of the loudspeaker to the full frequency band of the input audio signal, so that the loudspeaker is adjusted according to the frequency response curve data, and the method is a common method for engineering personnel.
The following describes a manner of adjusting the speaker based on the frequency response curve data, taking the adjustment of the speaker based on the main driving position mode as an example:
firstly, an engineer acquires a target frequency response curve of a current vehicle. For example, some users prefer low bass, the amplitude of the low frequency part of the target frequency response curve is larger, some people prefer the prominent sound of the low and medium frequency people, the amplitude of the low and medium frequency part of the target frequency response curve is larger, some people prefer high pitch, and the amplitude of the high frequency part of the target frequency response curve is larger. Theoretically, the best frequency response curve is a straight line parallel to the horizontal axis, but actually, the low frequency response amplitude is insufficient due to the inevitable defect of the speaker body, and therefore, the target frequency response curve is generated to have an amplitude smaller and smaller at the low frequency of 100 hz and below.
Then, the engineer moves the audio test instrument to the main driving position, and then tests with audio analysis software to obtain a frequency response curve of the main driving position, wherein the frequency response curve is an unadjusted frequency response curve.
After determining the target frequency response curve and the non-adjusted frequency response curve, an engineer may manually compensate the frequency points of the peaks and the troughs of the non-adjusted frequency response curve, for example, the engineer may adjust a filter in a digital signal processing device (e.g., a DSP) in the vehicle to lower the amplitudes of the frequency points corresponding to the peaks and raise the amplitudes of the frequency points corresponding to the troughs, and perform global correction according to the target frequency response curve.
However, in the process, for different vehicle types and different seats, engineering personnel need to perform repetitive work, the workload is large, time and labor are wasted, and the tuning efficiency is low.
In view of the problems of the foregoing solutions, the inventors of the present invention conducted intensive studies and finally proposed an automatic tuning method, which can be applied to a car audio system including a speaker array for playing audio, a microphone array for capturing audio, and a tuning processor (e.g., a DSP processor) for implementing the automatic tuning method. The speakers included in the speaker array are respectively arranged at different positions of a vehicle cabin, and the microphones included in the microphone array are respectively arranged at different positions of the vehicle cabin.
As shown in fig. 2, fig. 2 is a schematic layout diagram of a speaker array in a vehicle according to an embodiment of the present disclosure. In fig. 2, the speakers included in the speaker array are disposed in the door, with the woofer disposed on the lower side of the door and the tweeter disposed at the column A, B of the vehicle.
As shown in fig. 3, fig. 3 is a schematic layout diagram of a microphone array in a vehicle according to an embodiment of the present disclosure. In fig. 3, the microphone array comprises four microphones, two microphones are located in the front center dome area in the vehicle, and two microphones are located in the rear roof in the vehicle.
It should be noted that, for different vehicle models or different vehicles, there are multiple sound zones in the vehicle, each sound zone in the vehicle refers to each seat area in the vehicle, and when the speaker array and the microphone array are laid out, the microphones and the speakers may be arranged based on the distribution of each sound zone in the vehicle. Fig. 2 and 3 only show a schematic layout of a speaker array and a microphone array, and different vehicle models or different vehicles may be arranged in the manner shown in fig. 2 and 3, or may be arranged in other manners, which is not limited in this application.
In the present application, the microphone array may collect the audio signal played by the speaker array, and record the frequency response of the audio signal output by the speaker. The frequency response refers to a frequency range in which the acoustic apparatus reproduces sound and a frequency-dependent change in amplitude of sound waves. Generally, the detection index is referred to as a frequency amplitude of 1000Hz, and logarithms are represented by decibels (db) of the amplitude of the sound wave, and a sound pressure level can be represented by db, so that in the present application, a frequency response can be a sound pressure level of a signal at a single frequency point. The sound pressure level is obtained by multiplying 20 by a common logarithm of a ratio of the effective sound pressure to the reference sound pressure, and therefore, in the application, the frequency response can also be the sound pressure of a signal at a single frequency point.
Next, the automatic tuning method provided by the present application is described by the following embodiments.
Referring to fig. 4, fig. 4 is a schematic flowchart of an automatic tuning method according to an embodiment of the present application, where an execution main body of the method is a tuning processor in a car audio system, and the method may include:
s401: and acquiring the frequency response of the audio signal output by the in-vehicle loudspeaker with the first filtering parameter recorded by the in-vehicle microphone.
In this application, as an implementation manner, after the frequency response of the audio signal output by the in-vehicle speaker with the first filtering parameter is recorded, the in-vehicle microphone may send the recorded frequency response to the sound modulation processor. As still another possible implementation, the sound modulation processor may also send an instruction to the in-vehicle microphone to acquire a frequency response, if necessary, and the in-vehicle microphone may send the recorded frequency response to the sound modulation processor after receiving the instruction.
S402: and acquiring an actually measured frequency response curve of the position to be tuned in the car according to the frequency response of the audio signal output by the loudspeaker in the car according to the first filtering parameter recorded by the microphone in the car.
In the application, the position to be tuned in the vehicle can be any seat area in the vehicle, such as a driving seat, a passenger seat, a rear seat and the like. Debugging personnel can send instructions to the tone modulation processor, and the tone modulation processor can determine the position to be tuned in the car according to the received instructions.
In the method, after the in-vehicle to-be-tuned position is determined, the in-vehicle to-be-tuned position and the frequency response of the audio signal output by the first filtering parameter from the in-vehicle loudspeaker recorded by the in-vehicle microphone are combined, a plurality of actually measured frequency responses of the in-vehicle to-be-tuned position are obtained through different algorithms, and an actually measured frequency response curve of the in-vehicle to-be-tuned position is obtained according to the plurality of frequency responses.
S403: and adjusting the filtering parameters of the in-vehicle loudspeaker to be second filtering parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the in-vehicle loudspeaker with the second filtering parameters reach the preset sound effect corresponding to the target frequency response curve at the position.
Generally, different vehicle models have different preset sound effects, and the specific preset sound effect depends on the listening needs of users of the vehicle models. Before the automobile sound equipment leaves a factory, a target frequency response curve corresponding to a preset sound effect can be set. The target frequency response curve can represent the relationship of each frequency to the frequency response.
In this application, the sound adjusting processor may adjust the filtering parameter of the in-vehicle speaker to be the second filtering parameter based on the difference between the measured frequency response curve and the target frequency response curve, and it should be noted that the audio signal output by the in-vehicle speaker according to the second filtering parameter can reach the preset sound effect corresponding to the target frequency response curve at the position.
The adjustment mode can be various, for example, the filtering parameters of the adaptive filter can be controlled and changed by the modulation processor in different modes, so as to change the measured frequency response curve. The present application is not limited to this.
The embodiment discloses an automatic tuning method, which includes the steps that according to frequency response of an audio signal output by an in-vehicle loudspeaker according to first filtering parameters and recorded by an in-vehicle microphone, an actually measured frequency response curve of a position to be tuned in a vehicle is obtained; and adjusting the filtering parameters of the in-vehicle loudspeaker to be second filtering parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signal output by the in-vehicle loudspeaker with the second filtering parameters reaches the preset sound effect corresponding to the target frequency response curve at the position. According to the method, the frequency response curve of the position can be determined through the frequency response recorded by the microphone, an audio test instrument is not needed for manual measurement, and the filtering parameter of the loudspeaker in the vehicle can be automatically adjusted to be the second filtering parameter based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the method has high tuning efficiency.
In this application, still disclosed according to the frequency response of the audio signal of car interior speaker with the output of first filtering parameter of car interior microphone record, obtain the realization mode of waiting to tune the position actual measurement frequency response curve in the car, specifically as follows:
referring to fig. 5, fig. 5 is a schematic flow chart of a method for obtaining a measured frequency response curve of a to-be-tuned location in a vehicle according to a frequency response of an audio signal output by an in-vehicle speaker according to a first filtering parameter recorded by an in-vehicle microphone according to an embodiment of the present application, where the method includes the following steps:
s501: and acquiring the frequency response of all single-frequency-point signals in the audio signals output by the in-vehicle loudspeaker with the first filtering parameters and recorded by the in-vehicle microphone.
It should be noted that, since the audio signals output by the in-vehicle speakers are discrete single-frequency-point signals, the in-vehicle microphone may record the frequency response of all the single-frequency-point signals output by the in-vehicle speakers according to the first filtering parameter. Therefore, the frequency response of the audio signal output by the in-vehicle speaker with the first filtering parameter recorded by the in-vehicle microphone includes the frequency responses of all the single-frequency-point signals output by the in-vehicle speaker with the first filtering parameter.
S502: and calculating the frequency response of each single-frequency point signal at the position according to the frequency responses of all single-frequency point signals in the audio signals output by the in-vehicle loudspeaker according to the first filtering parameters recorded by the in-vehicle microphone.
In the method, the frequency response of each single-frequency point signal at the position can be calculated based on various algorithms according to the frequency responses of all single-frequency point signals in the audio signals output by the first filtering parameters of the in-vehicle loudspeaker recorded by the in-vehicle microphone.
Taking the frequency response as the sound pressure, as shown in fig. 6, the input signal of the microphone array is f (x, t) and the filter coefficient is aiThe output q of each microphone in the microphone arrayi(x, t) is:
qi(x，t)＝aifi(x，(t-τi) In which τ isiFor the delay, i is taken to be 0 to M-1, where M is the number of microphones included in the microphone array.
Then, the effective value of the sound pressure at the x position is:
Figure BDA0002289245940000121
s503: and acquiring an actually measured frequency response curve of the position to be tuned in the car according to the frequency response of all the single-frequency point signals at the position.
In this application, be in with all single-frequency point signals the frequency response smooth connection of position gets up, can acquire treat the actual measurement frequency response curve of tuning position in the car.
In this application, still disclose based on measured frequency response curve and target frequency response curve's difference, will the implementation that the filtering parameter of car interior speaker adjusted to the second filtering parameter specifically as follows:
and controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition, and determining the filtering parameter of the adaptive filter when the actually measured frequency response curve is adjusted for the last time as the second filtering parameter.
In this embodiment, the difference between the adjusted frequency response curve and the target frequency response curve meeting the preset condition may include multiple situations, for example, the preset condition is that the difference between the frequency responses of a preset number of single frequency points in the adjusted frequency response curve and the corresponding target frequency responses is within a preset range, or the difference between the frequency responses of all the single frequency points in the adjusted frequency response curve and the corresponding target frequency responses is within a preset range.
And when the preset condition is that the difference between the frequency response of all the single frequency points in the adjusted frequency response curve and the corresponding target frequency response is within the preset range, controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets the preset condition, specifically, controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the frequency response of all the frequency points in the adjusted frequency response curve and the corresponding target frequency response is within the preset range.
The process of adjusting the frequency response curve by controlling the adaptive filter each time can be as follows:
comparing a frequency response curve to be adjusted with a target frequency response curve, and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve; the frequency response curve to be adjusted comprises the actually measured frequency response curve or a frequency response curve after the last adjustment adjacent to the current adjustment; and controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, wherein in the frequency response curve after the adjustment, the difference between the frequency response of the target frequency point and the corresponding target frequency response is within a preset range.
The method comprises the following steps of comparing a frequency response curve to be adjusted with a target frequency response curve, and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve, wherein the method comprises the following steps: and comparing the frequency response curve to be adjusted with a target frequency response curve, and determining the frequency point corresponding to the wave crest in the frequency response curve to be adjusted and/or the frequency point corresponding to the wave trough.
The controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, and the method comprises the following steps:
controlling an adaptive filter to perform reverse compensation on frequency points corresponding to wave crests in the frequency response curve to be adjusted and/or frequency points corresponding to wave troughs (for example, a certain frequency point shows a wave crest trend and protrudes upwards by 10dB, and the frequency point can be subjected to negative 10dB operation by the filter so that the frequency response curve is smooth), so as to obtain the frequency response curve after the adjustment, wherein the difference between the frequency response of the frequency point corresponding to the wave crest in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range; and the difference between the frequency response of the frequency point corresponding to the wave trough in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range.
To more clearly illustrate the execution effect of the automatic tuning method of the present application, please refer to fig. 7, fig. 7 is a schematic diagram of an application example of the automatic tuning method provided in the embodiment of the present application, and as shown in fig. 7, the difference between the adjusted frequency response curve and the target frequency response curve is closer to the adjusted frequency response curve than the difference between the frequency response curve before the adjustment and the target frequency response curve.
Based on the above, after the automatic debugging of the position is completed, the automatic debugging can be performed on other positions in the vehicle by referring to the above mode. When the user is located at a certain position in the vehicle, the corresponding filtering parameters at the position are directly called to carry out the Bobby on the audio signal output by the loudspeaker, and the audio signal output by the loudspeaker can reach the preset sound effect.
In the above embodiment, the target audio system is taken as an example of a car audio, and the automatic tuning method according to the present application is described in detail. For sound systems in other scenes, reference may be made to the above embodiments, which are not described in detail herein.
The following describes the automatic tuning device disclosed in the embodiment of the present application, and the automatic tuning device described below and the automatic tuning method described above may be referred to in correspondence with each other.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an automatic tuning device according to an embodiment of the present application. As shown in fig. 8, the automatic tuning device may include:
an obtaining unit 81, configured to obtain a frequency response of an audio signal recorded by a microphone and output by a speaker with a first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
the actually measured frequency response curve acquiring unit 82 is used for acquiring an actually measured frequency response curve of the position to be tuned according to the frequency response of the audio signal which is recorded by the microphone and output by the loudspeaker according to the first filtering parameter;
and the automatic tuning unit 82 is used for adjusting the filtering parameters of the loudspeaker to be second filtering parameters based on the difference between the actual measurement frequency response curve and the target frequency response curve, so that the audio signal output by the loudspeaker through the second filtering parameters reaches the preset sound effect corresponding to the target frequency response curve at the position.
Optionally, the actually measured frequency response curve obtaining unit includes:
the frequency response acquisition unit of single frequency point signal: the device comprises a microphone, a first filter parameter and a second filter parameter, wherein the microphone is used for recording the audio signals output by the loudspeaker;
the calculating unit is used for calculating the frequency response of each single-frequency point signal at the position according to the frequency responses of all single-frequency point signals in the audio signals output by the microphone through the first filtering parameters of the loudspeaker;
and the actual measurement frequency response curve acquisition unit is used for acquiring the actual measurement frequency response curve of the position to be tuned according to the frequency response of all the single-frequency point signals at the position.
Optionally, the automatic tuning unit includes:
the frequency response curve adjusting unit is used for controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition;
and the second filter parameter determining unit is used for determining the filter parameter when the self-adaptive filter adjusts the actually measured frequency response curve for the last time as the second filter parameter.
Optionally, the frequency response curve adjusting unit includes:
and the frequency point frequency response adjusting unit is used for controlling the self-adaptive filter to adjust the actually measured frequency response curve until the difference between the frequency response of all frequency points in the adjusted frequency response curve and the corresponding target frequency response is within a preset range.
Optionally, the frequency point frequency response adjusting unit includes:
the target frequency point determining unit is used for comparing the frequency response curve to be adjusted with a target frequency response curve and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve; the frequency response curve to be adjusted comprises the actually measured frequency response curve or a frequency response curve after the last adjustment adjacent to the current adjustment;
and the target frequency point frequency response adjusting unit is used for controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, wherein in the frequency response curve after the adjustment, the difference between the frequency response of the target frequency point and the corresponding target frequency response is within a preset range.
Optionally, the target frequency point determining unit is specifically configured to:
and comparing the frequency response curve to be adjusted with a target frequency response curve, and determining the frequency point corresponding to the wave crest in the frequency response curve to be adjusted and/or the frequency point corresponding to the wave trough.
Optionally, the target frequency point frequency response adjusting unit includes:
the reverse compensation unit is used for controlling the adaptive filter to perform reverse compensation on the frequency points corresponding to the wave crests in the frequency response curve to be adjusted and/or the frequency points corresponding to the wave troughs to obtain the frequency response curve after the adjustment, wherein the difference between the frequency response of the frequency points corresponding to the wave crests in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range; and the difference between the frequency response of the frequency point corresponding to the wave trough in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range.
Optionally, the target sound system is a car sound.
It should be noted that specific function implementation of each unit is already described in detail in the method embodiment, and this embodiment is not described again.
Fig. 9 is a block diagram of a hardware structure of an automatic tuning system according to an embodiment of the present application, and referring to fig. 8, the hardware structure of the automatic tuning system may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4;
in the embodiment of the application, the number of the processor 1, the communication interface 2, the memory 3 and the communication bus 4 is at least one, and the processor 1, the communication interface 2 and the memory 3 complete mutual communication through the communication bus 4;
the processor 1 may be a central processing unit CPU, or an application specific Integrated circuit asic, or one or more Integrated circuits configured to implement embodiments of the present invention, etc.;
the memory 3 may include a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory) or the like, such as at least one disk memory;
wherein the memory stores a program and the processor can call the program stored in the memory, the program for:
acquiring an actually measured frequency response curve of a position to be tuned according to the frequency response of the audio signal output by the microphone through the loudspeaker according to the first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the loudspeaker through the second filter parameters reach a preset sound effect corresponding to the target frequency response curve at the position.
Alternatively, the detailed function and the extended function of the program may be as described above.
Embodiments of the present application further provide a storage medium, where a program suitable for execution by a processor may be stored, where the program is configured to:
acquiring an actually measured frequency response curve of a position to be tuned according to the frequency response of the audio signal output by the microphone through the loudspeaker according to the first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the loudspeaker through the second filter parameters reach a preset sound effect corresponding to the target frequency response curve at the position.
Alternatively, the detailed function and the extended function of the program may be as described above.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. An automatic tuning method, comprising:
acquiring the frequency response of an audio signal which is recorded by a microphone and output by a loudspeaker according to a first filtering parameter; the microphone and the loudspeaker are arranged in a target sound system;
acquiring an actually measured frequency response curve of a position to be tuned according to the frequency response of the audio signal output by the loudspeaker through the first filtering parameter recorded by the microphone;
and adjusting the filter parameters of the loudspeaker to be second filter parameters based on the difference between the actually measured frequency response curve and the target frequency response curve, so that the audio signals output by the loudspeaker through the second filter parameters reach a preset sound effect corresponding to the target frequency response curve at the position.
2. The method according to claim 1, wherein the obtaining of the measured frequency response curve of the to-be-tuned position according to the frequency response of the audio signal output by the microphone with the first filtering parameter comprises:
acquiring frequency responses of all single-frequency point signals in audio signals output by a loudspeaker through a first filtering parameter recorded by a microphone;
calculating the frequency response of each single-frequency point signal at the position according to the frequency responses of all single-frequency point signals in the audio signals output by the microphone according to the first filtering parameters of the loudspeaker;
and acquiring an actually measured frequency response curve of the position to be tuned according to the frequency responses of all the single-frequency point signals at the positions.
3. The method of claim 1, wherein adjusting the filter parameters of the speaker to a second filter parameter based on the difference between the measured frequency response curve and the target frequency response curve comprises:
controlling an adaptive filter to adjust the actually measured frequency response curve until the difference between the adjusted frequency response curve and the target frequency response curve meets a preset condition;
and determining the filtering parameter of the adaptive filter when the actually measured frequency response curve is adjusted for the last time as the second filtering parameter.
4. The method of claim 3, wherein the controlling the adaptive filter to adjust the measured frequency response curve until a difference between the adjusted frequency response curve and a target frequency response curve meets a preset condition comprises:
and controlling the adaptive filter to adjust the actually measured frequency response curve until the difference between the frequency response of all frequency points in the adjusted frequency response curve and the corresponding target frequency response is within a preset range.
5. The method of claim 4, wherein each adjustment of the adaptive filter is performed as follows:
comparing a frequency response curve to be adjusted with a target frequency response curve, and determining target frequency points with difference between the frequency response curve to be adjusted and the target frequency response curve; the frequency response curve to be adjusted comprises the actually measured frequency response curve or a frequency response curve after the last adjustment adjacent to the current adjustment;
and controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the adjustment, wherein in the frequency response curve after the adjustment, the difference between the frequency response of the target frequency point and the corresponding target frequency response is within a preset range.
6. The method of claim 5, wherein comparing the frequency response curve to be adjusted with a target frequency response curve and determining target frequency points at which the frequency response curve to be adjusted and the target frequency response curve have differences comprises:
and comparing the frequency response curve to be adjusted with a target frequency response curve, and determining the frequency point corresponding to the wave crest in the frequency response curve to be adjusted and/or the frequency point corresponding to the wave trough.
7. The method of claim 6, wherein the controlling the adaptive filter to adjust the frequency response of the target frequency point to obtain a frequency response curve after the current adjustment comprises:
controlling an adaptive filter to perform reverse compensation on frequency points corresponding to wave crests in the frequency response curve to be adjusted and/or frequency points corresponding to wave troughs to obtain the frequency response curve after the adjustment, wherein the difference between the frequency response of the frequency points corresponding to the wave crests in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range; and the difference between the frequency response of the frequency point corresponding to the wave trough in the frequency response curve after the adjustment and the corresponding target frequency response is within a preset range.
8. The method according to any one of claims 1 to 7, wherein the target sound system is a car sound.
9. An automatic tuning device, comprising:
the actual measurement frequency response curve acquisition unit is used for acquiring an actual measurement frequency response curve of the position to be tuned according to the frequency response of the audio signal output by the microphone through the first filtering parameter of the loudspeaker; the microphone and the loudspeaker are arranged in a target sound system;
and the automatic tuning unit is used for adjusting the filtering parameters of the loudspeaker into second filtering parameters based on the difference between the actual measurement frequency response curve and the target frequency response curve, so that the position of the loudspeaker with the audio signal output by the second filtering parameters reaches the preset sound effect corresponding to the target frequency response curve.
10. An automatic tuning system comprising a memory and a processor;
the memory is used for storing programs;
the processor, which executes the program, implements the steps of the auto-tuning method according to any one of claims 1 to 8.
11. A readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, carries out the steps of the method of auto-tuning according to any one of claims 1 to 8.
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