WO2021248525A1

WO2021248525A1 - Nonlinear signal compensation method and apparatus, electronic device, and storage medium

Info

Publication number: WO2021248525A1
Application number: PCT/CN2020/096691
Authority: WO
Inventors: 蓝睿智; 吴锐兴; 叶利剑
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-06-12
Filing date: 2020-06-18
Publication date: 2021-12-16
Also published as: CN111800713A; CN111800713B

Abstract

The present invention provides a nonlinear signal compensation method and apparatus, an electronic device, and a storage medium. The method comprises: obtaining a first channel audio signal, the first channel audio signal being a left channel audio signal or a right channel audio signal; obtaining a first nonlinear parameter of a first loudspeaker; and performing compensation processing on the first channel audio signal according to the first nonlinear parameter of the first loudspeaker to obtain a first channel output signal, the first channel output signal being outputted by the first loudspeaker. The nonlinear signal compensation method in the present invention can reduce the problem of nonlinear distortion in stereo enhancement processing to remarkably promote the stereo output effect.

Description

Signal nonlinear compensation method, device, electronic equipment and storage medium

Technical field

The present invention relates to the technical field of loudspeakers, and in particular to a signal non-linear compensation method, device, electronic equipment and storage medium.

Background technique

With the continuous development of the mobile phone industry, major mobile phone manufacturers are paying more and more attention to the ease of use and multimedia performance of the system. In terms of audio, consumers have higher and higher requirements for multimedia audio and video, and stereo systems composed of dual speakers are used more and more frequently in smart terminals.

Normal stereo recording is tuned with the ideal listening position-the listener is located at the center of the two speakers and is at 60 angles during the original mixing process. However, for mobile smart terminals such as mobile phones, For devices such as tablet computers, because the two speakers are very close, there is a large deviation from the ideal listening position in actual applications. When the audio is actually played, a stereo enhancement algorithm is used to process the original stereo audio signal, and then two speakers are used for playback to achieve the effect of enhancing the stereo listening effect.

However, the actual loudspeaker is affected by various factors and has a great deviation from the desired left and right channel sound signals, resulting in poor stereo enhancement effect.

Summary of the invention

Based on this, it is necessary to provide a signal nonlinear compensation method, device, electronic device, and storage medium to solve the above-mentioned problem that the speaker is affected by various factors and the stereo sound enhancement effect is not good.

The technical scheme of the present invention is as follows:

On the one hand, a signal nonlinearity compensation method is provided, which includes:

Acquiring a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal;

Acquiring the first non-linear parameter of the first speaker;

Performing compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is output by the first speaker.

Optionally, the method further includes:

Perform frequency response correction processing on the first channel audio signal according to the second nonlinear parameter of the first speaker to obtain the first channel output signal, and the second nonlinear parameter of the first speaker is based on The expected first speaker response is estimated and obtained.

Optionally, the performing frequency response correction processing on the first channel audio signal according to the second non-linear parameter of the first speaker to obtain the first channel output signal includes:

Predicting the state variable of the first speaker;

Constructing the first channel target signal according to the first channel audio signal, the state variable of the first speaker and the second non-linear parameter of the first speaker;

Filtering the first channel target signal according to the state variable of the first speaker and the first non-linear parameter of the first speaker to obtain the first channel output signal.

Optionally, the performing frequency response correction processing on the first channel audio signal according to the second non-linear parameter of the first speaker includes:

Based on the linear filter, adjust the T/S parameter according to the second non-linear parameter of the first speaker, and perform frequency response correction processing on the first channel audio signal; or,

Based on the non-linear filter, by adjusting the characteristic curve of the first non-linear parameter of the first speaker, the frequency response correction processing is performed on the first channel audio signal.

Optionally, before the acquiring the first channel audio signal, the method further includes:

Acquiring an original first channel audio signal, where the first channel audio signal is an original left channel audio signal or an original right channel audio signal;

Perform stereo enhancement processing on the original first channel audio signal to obtain the first channel audio signal after stereo enhancement.

Optionally, the first non-linear parameter of the first speaker includes:

The nonlinear parameter of the first speaker obtained by offline testing, or the nonlinear parameter of the first speaker updated online.

Optionally, when the nonlinear parameter of the first speaker is updated online, the method further includes:

Acquire the condition parameter of the first speaker, and update the nonlinear parameter of the first speaker according to the first condition parameter and a preset mapping relationship between the first speaker condition parameter and the nonlinear parameter, where the condition parameter includes But it is not limited to one or more of the ambient temperature, working time, and dynamic range of input signal power.

On the other hand, a signal nonlinearity compensation device is provided, which includes:

An acquiring module, configured to acquire a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal;

The acquiring module is used to acquire the first non-linear parameter of the first speaker;

The nonlinear compensation module is configured to perform compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is The first speaker output.

In another aspect, an electronic device is provided, including a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the same as the first aspect and any of them. One possible way to achieve the steps.

In another aspect, a computer storage medium is provided, the computer storage medium stores one or more instructions, and the one or more instructions are suitable for being loaded by a processor and executed as in the first aspect and any one thereof Possible implementation steps.

The beneficial effect of the present invention is: according to the non-linear parameters of the left and right speakers, the left and right channel signals are respectively subjected to adaptive predistortion processing, and the distortion caused by the nonlinearity of the system is pre-compensated at the input end, which can reduce the stereo enhancement The non-linear distortion in the processing can significantly improve the stereo effect.

Description of the drawings

FIG. 1 is a schematic flowchart of a signal nonlinear compensation method provided by the present invention;

2 is a schematic flowchart of another signal nonlinear compensation method provided by the present invention;

Fig. 3 is a schematic structural diagram of a signal nonlinearity compensation device provided by the present invention;

FIG. 4 is a schematic diagram of a system flow diagram including a nonlinear compensation module provided by the present invention;

Fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific sequence. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent in these processes, methods, products or equipment.

Reference to "embodiments" herein means that a specific feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments.

The embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a signal nonlinearity compensation method according to an embodiment of the present invention. The method may include:

101. Acquire a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal.

The execution subject of the embodiment of the present invention may be a signal nonlinearity compensation device. The signal nonlinearity compensation device includes a speaker, which can perform stereo enhancement processing and nonlinear compensation on the audio signal, and output the processed audio signal. In an embodiment, the above-mentioned signal non-linear compensation device may be an electronic device, and the above-mentioned electronic device may be a terminal device, including but not limited to mobile terminals, earphones, audio playback devices, and laptop computers, tablet computers, etc. Other portable devices or desktop computers.

The left channel and the right channel of the stereo sound output by the electronic device can respectively broadcast the same or different sounds, resulting in a stereo sound change effect such as from left to right or from right to left. For different electronic devices, you can choose to play music through different operation modes, and obtain the corresponding audio signal for output, and there is no restriction here.

In order to briefly and clearly introduce the solution in the embodiments of the present invention, the first channel audio signal is used for general description. The first channel audio signal may be a left channel audio signal or a right channel audio signal, and the system may include at least The two speakers, the first speaker and the second speaker, are respectively one of the left speaker and the right speaker. This method can be used to perform the same steps for the left channel audio signal and the right channel audio signal, but requires corresponding speakers and related parameters, that is, the left channel audio signal corresponds to the left speaker, and the right channel audio signal corresponds to the right speaker. The processing flow can be regarded as independent of each other.

In an embodiment, before step 101, the method further includes:

Acquiring an original first channel audio signal, where the foregoing first channel audio signal is an original left channel audio signal or an original right channel audio signal;

The left and right channels of the original audio signal can be subjected to stereo enhancement processing respectively to obtain the enhanced left and right channel audio signals, which can generally be played directly through the corresponding speakers, but this system is a system based entirely on signal processing. Taking into account the nonlinear distortion of actual speakers and speaker differences. For example, a speaker with a small volume will produce a lot of nonlinear distortion (THD) when the driving voltage is large, and low-frequency and high-frequency signals will also produce intermodulation distortion (IMD), resulting in the actual broadcast signal , Under the action of THD and IMD, distortion is produced, and there is a big deviation from the desired left and right channel sound signals, resulting in poor stereo enhancement effect. Therefore, step 102 can be performed.

102. Acquire a first non-linear parameter of the first speaker.

In the case of larger amplitude, the speakers will more or less show non-linear characteristics, and there will be signal components that do not exist in the input signal. In the linear distortion of the speaker, the distortion object is the amplitude and/or phase of the output signal, while the nonlinear distortion implies that the output signal contains frequency components that do not exist in the input signal. In order to solve the problem caused by the nonlinear distortion, you can first determine The non-linear parameters of the loudspeaker are compensated accordingly.

Specifically, the indirect test method can generally be used to analyze the nonlinearity of the speaker vibration, that is, the first speaker circuit model is built in advance, and then the speaker analyzer is used to test and the adaptive fitting calculation method is used to obtain the relevant first speaker. Non-linear parameters of a loudspeaker.

Optionally, the first non-linear parameter of the first speaker includes: the non-linear parameter of the first speaker obtained by offline testing, or the non-linear parameter of the first speaker updated online.

Optionally, the offline test may include direct testing of the first speaker through a speaker test system, rangefinder and other equipment to analyze the nonlinearity of the vibration of the first speaker, so as to directly obtain the nonlinear parameters of the first speaker, and preset Provided during use in the device. Specifically, a DC bias voltage signal can be applied to the first speaker (which can be the same as another speaker or an analog speaker) to bias the voice coil of the first speaker in the magnetic gap, and then use a rangefinder such as laser measurement The distance meter measures the bias displacement of the voice coil of the first speaker under the DC bias voltage signal, and outputs to the first speaker through the speaker test system while keeping the value of the DC bias voltage signal at both ends of the first speaker unchanged AC analysis signal to obtain the impedance curve and displacement-voltage transfer function curve of the voice coil of the first loudspeaker in the bias position, and then calculate the nonlinear parameters of the first loudspeaker in the biased state of the voice coil based on these curves The value of.

Then the magnitude of the DC bias voltage signal can be changed multiple times, the above steps are repeated, the offset displacement of the voice coil of the first speaker in the magnetic gap under the corresponding DC bias voltage signal is measured and the corresponding offset displacement is calculated. The value of the nonlinear parameter of the first loudspeaker under the bias displacement of the voice coil.

In an optional implementation manner, in the case where the nonlinear parameter of the first speaker is updated online, the method further includes:

Acquire the condition parameter of the first speaker, and update the nonlinear parameter of the first speaker according to the first condition parameter and the preset mapping relationship between the first speaker condition parameter and the nonlinear parameter. The condition parameter includes but is not limited to the environment One or more of temperature, working time, and dynamic range of input signal power.

It is also possible to obtain the nonlinear characteristic curve of the first speaker through simulation or measurement, which may include a preset mapping relationship between the first speaker condition parameter and the nonlinear parameter. The above condition parameters are all factors that affect the nonlinear distortion of the first speaker. It may include, but is not limited to, one or more of the ambient temperature, working time, and input signal power dynamic range, for example, the mapping relationship between the ambient temperature and the nonlinear parameter of the first speaker. Furthermore, the non-linear parameter of the first speaker can be updated periodically. The specific method is to obtain the current condition parameter of the first speaker based on the above-mentioned condition parameter and the preset mapping relationship between the first speaker condition parameter and the non-linear parameter. , Determine the current nonlinear parameters of the first speaker, and achieve real-time acquisition of the nonlinear parameters of the first speaker.

In summary, different ways can be used to obtain the nonlinear parameters of the first speaker offline test, or the obtained nonlinear characteristic curve can be used to determine the nonlinear parameters updated online of the first speaker in the working state. No restrictions.

103. Perform compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is output by the first speaker.

Specifically, a corresponding compensation signal may be generated according to the nonlinear parameters of the speaker, and the compensation signal may be used to perform nonlinear predistortion processing on the first channel audio signal. Before the loudspeaker is output, the corresponding compensation signal is added through pre-distortion processing, and the distortion caused by the nonlinearity is pre-compensated at the input end, and the obtained first channel output signal can be output by the corresponding first loudspeaker. Therefore, the output signal of the first channel after the first speaker plays is the linear response of the input electrical signal, which can significantly reduce the distortion of the harmonic components caused by nonlinear distortion, thereby ensuring that the played sound signal is basically the expected response. Coincide. The above-mentioned compensation processing is performed on the left and right audio signals respectively, so that the output stereo effect of the left and right speakers is better.

The compensation processing can be realized by a nonlinear filter, which is a nonlinear compensator, and can eliminate the nonlinear behavior of the first speaker by controlling the excitation signal without changing the structure of the speaker. Ideally, the non-linear filter can form an all-pass filter with the actual first speaker.

In an embodiment, the method further includes:

According to the second nonlinear parameter of the first speaker, the frequency response correction process is performed on the first channel audio signal to obtain the first channel output signal. The second nonlinear parameter of the first speaker is based on the expected first channel output signal. The speaker response is estimated.

The output sound pressure reference (Output Sound Pressure Level) is also called efficiency or sensitivity or sound pressure level. The Japanese National Standard (JIS) stipulates that the output sound pressure of the speaker refers to the 1W input power fed to the speaker in the specified frequency band or power, and the average value of the sound pressure pole at a distance of 1m from the reference point on the reference axis, usually taken as the frequency The average value of 4 points on the characteristic curve, expressed in dB. The output sound pressure reflects the size of the sound, which is not necessarily related to the sound quality. Frequency response curve (SPL curve) refers to a constant signal source applied to the loudspeaker. When the frequency of the signal source is changed from low frequency to high frequency, the sound pressure of the loudspeaker will change with the change of frequency, and the sound pressure-frequency curve can be obtained. , This is the frequency response curve of the speaker, that is, the curve of the sound pressure of the speaker changing with frequency. Frequency response refers to the characteristic that the sound pressure generated by the speaker changes with frequency when a constant voltage is input to the speaker.

In the embodiment of the present invention, in addition to the above-mentioned nonlinear distortion compensation processing, frequency response correction can also be performed for different speakers, that is, the shape of the SPL curve of the speaker itself can be changed. The corrected stereo signal will still maintain good symmetry even if the left and right channels respond to different systems, which improves the actual effect of the stereo.

In an optional implementation manner, the above-mentioned performing frequency response correction processing on the above-mentioned first channel audio signal according to the second non-linear parameter of the above-mentioned first speaker includes:

Based on the non-linear filter, by adjusting the characteristic curve of the first non-linear parameter of the first speaker, the frequency response correction process is performed on the audio signal of the first channel.

The T/S parameter is a speaker parameter standard named by the first letter of the person's name, and defines the physical parameters of many speakers, including large-signal parameters and small-signal parameters.

Specifically, a target equalizer can be used to implement the above-mentioned frequency response correction processing. Without changing the speaker structure, adjust the control signal according to the nonlinear model of the speaker so that the actual speaker shows the desired response. The equalizer can be a linear filter. In this case, functions such as low frequency boost and mechanical quality factor Q compression can be realized by adjusting the T/S parameters. The equalizer can also be non-linear. By adjusting the curve shape of the non-linear parameters, such as the force factor Bl(x), the stiffness coefficient Kms(x) and the damping coefficient Rms(v), the change of these non-linear characteristics can make the speaker Get the desired sense of hearing.

The present invention obtains the first non-linear parameter of the first speaker by obtaining the first channel audio signal, the first channel audio signal being the left channel audio signal or the right channel audio signal, according to the first non-linear parameter of the first speaker The nonlinear parameter performs compensation processing on the first channel audio signal to obtain a first channel output signal, and the first channel output signal is output by the first speaker. The signal non-linear compensation method of the present invention can perform adaptive pre-distortion processing on the left and right channel signals respectively according to the non-linear parameters of the left and right speakers, and pre-compensate the distortion caused by the nonlinear system at the input end, which can reduce The non-linear distortion in the stereo enhancement processing significantly enhances the stereo effect.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart of another signal nonlinear compensation method according to an embodiment of the present invention. As shown in Figure 2, the method may include:

201. Acquire a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal.

202. Acquire a first non-linear parameter of the first speaker.

203. Perform compensation processing on the audio signal of the first channel according to the first nonlinear parameter of the first speaker.

Among them, the above-mentioned step 201-step 203 may refer to the specific descriptions in step 101-step 103 shown in FIG. 1 respectively, which will not be repeated here.

204. Predict the state variable of the foregoing first speaker.

Specifically, in the embodiment of the present invention, the aforementioned target equalizer may be used to implement the aforementioned frequency response correction processing. A nonlinear loudspeaker model describing the behavior of the first loudspeaker under a large signal can be used. The output voltage signal of the first loudspeaker terminal can be passed through the model to predict the displacement, speed, voltage and other state variables of the first loudspeaker for subsequent processing. The parameters.

205. Construct a first channel target signal according to the first channel audio signal, the state variable of the first speaker, and the second nonlinear parameter of the first speaker.

In the embodiment of the present invention, the first nonlinear parameter of the first speaker is the result of offline or offline parameter estimation. This parameter may be called the actual nonlinear parameter, which describes the behavior of the actual speaker. For example, it may include: voice coil (coil ) DC impedance Re _r , the length of the voice coil wire in the magnetic field Le _r , the force factor Bl _r _{(x) of the magnetic circuit system, the mechanical mass Mt r} including the sound box and the air load, and the mechanical stiffness of the suspension system Kms _r (x) , The force resistance of the vibration system Rms _r (v), etc.;

The above-mentioned second non-linear parameter can be called the target non-linear parameter, which is estimated and obtained based on the expected first speaker response. For example, it can be obtained by fitting the expected first speaker response and the model to satisfy the stability and physical constraints. It may be obtained by parameter estimation of another actual first speaker sample, for example, a good product produced during the mass production of the speaker can be selected for parameter estimation. Corresponding to such parameters may also include certain _{_{non-linear: Re t, Le t, Bl}} t (x), Mt t, Kms t (x), Rms t (v) the like.

The above-mentioned first non-linear parameter may satisfy different standards, which is not limited in the embodiment of the present invention. After constructing the first channel target signal based on the above-mentioned data and parameters, step 206 may be executed.

206. Perform filtering processing on the first channel target signal according to the state variable of the first speaker and the first nonlinear parameter of the first speaker to obtain the first channel output signal. Specifically, for the above-mentioned first channel target signal, filtering processing is performed on the first channel target signal based on the state variable and the first non-linear parameter of the first speaker to generate an inversely filtered first channel output signal, Thus, the first channel output signal can be output to the corresponding first speaker.

See Figure 3 for a schematic diagram of a system flow including a nonlinear compensation module. As shown in Figure 3, 1 is the left channel of the original audio signal, and 2 is the right channel of the original audio signal. Through 3 stereo enhancement modules, 4 stereo enhanced left channel audio signals and 5 stereo enhanced audio signals can be obtained. The right channel audio signal; 6 is the nonlinear parameter of the left channel speaker L that is tested offline or updated online, and 8 is the nonlinear parameter of the right channel speaker R that is tested offline or updated online;

9 is the left channel audio signal after predistortion stereo enhancement, and 10 is the right channel audio signal after predistortion stereo enhancement;

7 is the non-linear compensation module, which can pre-distorte the signal and correct the expected frequency response according to the non-linear parameters of the speaker; among them, for the 4-left channel audio signal, the 4 is pre-distorted according to the non-linear parameters of the 6-left channel speaker. Distortion processing and expected frequency response correction processing, output the final 9; for the 5-right channel audio signal, perform predistortion processing and expected frequency response correction processing on 5 according to the non-linear parameters of the 8-left channel speaker, and output the final 10.

Generally, a system based entirely on signal processing does not take into account the nonlinear distortion of actual speakers. Actually used stereo speaker system, especially the stereo system used on mobile phone terminals, the two speakers of the left and right channels are often very different in size, volume, and sensitivity. Directly playing the stereo enhanced audio often results in very strong Asymmetry, which affects the final sense of hearing.

Small speakers, when the driving voltage is large, will produce large non-linear distortion (THD), and low-frequency signals and high-frequency signals will also produce intermodulation distortion (IMD), resulting in the actual broadcast signal, Under the action of THD and IMD, distortion is generated, which greatly deviates from the desired left and right channel sound signals, resulting in poor stereo enhancement effect.

However, in the embodiment of the present invention, the first non-linear parameter of the first speaker is obtained by obtaining the first channel audio signal, and the first channel audio signal is the left channel audio signal or the right channel audio signal, according to the first speaker The first nonlinear parameter performs compensation processing on the first channel audio signal, predicts the state variable of the first speaker, based on the first channel audio signal, the state variable of the first speaker, and the first speaker Two non-linear parameters, construct the first channel target signal, and then perform filtering processing on the first channel target signal according to the state variable of the first speaker and the first non-linear parameter of the first speaker to obtain the first sound Channel output signal. For stereo enhancement systems with left and right channels, the signal is predistorted by identifying the linear and nonlinear parameters of the left and right speaker systems, and the distortion caused by the nonlinearity of each system is pre-distorted at the input. Compensation, so that the sound signals played by the left and right speaker systems are the linear response of the input electrical signal, which can significantly reduce the distortion of the harmonic components caused by nonlinear distortion, and then ensure that the played sound signal is basically the expected response At the same time, the left and right speakers can change the target response by adjusting the target speaker parameters (the second non-linear parameter), so that the frequency response can be corrected for different speakers, that is, the shape of the SPL curve of the speaker itself can be changed. The corrected stereo signal will still maintain good symmetry even if the left and right channels respond differently to the system, thus improving the actual effect of the stereo.

Based on the description of the foregoing signal non-linear compensation method embodiment, the embodiment of the present invention also discloses a signal non-linear compensation device. Please refer to FIG. 4, the signal nonlinearity compensation device 400 includes:

The acquiring module 410 is configured to acquire a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal;

The above-mentioned obtaining module 410 is configured to obtain the first non-linear parameter of the first speaker;

The nonlinear compensation module 420 is configured to perform compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is generated by the first channel Speaker output.

Optionally, the non-linear compensation module 420 is further configured to perform frequency response correction processing on the audio signal of the first channel according to the second non-linear parameter of the first speaker to obtain the output signal of the first channel. The second nonlinear parameter of the first speaker is estimated and obtained based on the expected response of the first speaker.

Optionally, the aforementioned nonlinear compensation module 420 includes:

The state estimation unit 421 is configured to predict the state variable of the above-mentioned first speaker;

The target equalization unit 422 is configured to construct a first channel target signal according to the first channel audio signal, the state variable of the first speaker, and the second nonlinear parameter of the first speaker;

The non-linear filtering unit 423 is configured to perform filtering processing on the first channel target signal according to the state variable of the first speaker and the first non-linear parameter of the first speaker to obtain the first channel output signal.

Optionally, the aforementioned nonlinear compensation module 420 or target equalization unit 422 is specifically configured to:

Optionally, the aforementioned signal nonlinearity compensation device 400 further includes a stereo enhancement module 430 for:

Optionally, the first non-linear parameter of the first speaker includes:

Optionally, the above-mentioned obtaining module 410 is specifically used for:

When the nonlinear parameter of the first speaker is updated online, the condition parameter of the first speaker is acquired, and the first condition parameter is updated according to the first condition parameter and the preset mapping relationship between the first speaker condition parameter and the nonlinear parameter. Non-linear parameters of a loudspeaker. The above-mentioned condition parameters include but are not limited to one or more of ambient temperature, working time, and dynamic range of input signal power.

According to an embodiment of the present invention, the steps involved in the methods shown in FIG. 1 and FIG. 2 may all be executed by each module in the signal non-linear compensation device 400 shown in FIG. 4, and will not be repeated here.

For example, the nonlinear compensation module 7 shown in FIG. 3 may correspond to the aforementioned nonlinear parameter module 420.

In the signal nonlinearity compensation device 400 in the embodiment of the present invention, the signal nonlinearity compensation device 400 can obtain the first channel audio signal, and the first channel audio signal is the left channel audio signal or the right channel audio signal, and the second channel audio signal is obtained. The first non-linear parameter of a loudspeaker is subjected to compensation processing on the first channel audio signal according to the first non-linear parameter of the first loudspeaker to obtain a first channel output signal. The first channel output signal is determined by the first channel output signal. A speaker output, according to the non-linear parameters of the left and right speakers, the left and right channel signals can be subjected to adaptive predistortion processing respectively, and the distortion caused by the system due to non-linearity can be pre-compensated at the input end, which can reduce the stereo enhancement processing Non-linear distortion, significantly enhance the stereo effect.

Based on the description of the foregoing method embodiment and device embodiment, an embodiment of the present invention also provides an electronic device. Referring to FIG. 5, the electronic device includes at least a processor 510, a non-volatile storage medium 520, an internal memory 530, and a network interface 540, where the processor 510, the non-volatile storage medium 520, the internal memory 530, and the network interface The 540 can be connected via the system bus 550 or other means, and can communicate with other devices via the network interface 540.

The non-volatile storage medium 520, that is, a computer storage medium, can be stored in the memory. The above-mentioned computer storage medium is used to store a computer program and an operating system. The internal memory 530 also stores a computer program. The above-mentioned computer program includes program instructions, and the above-mentioned processor can be used. To execute the above program instructions. The processor 510 (or CPU (Central Processing Unit, central processing unit)) is the computing core and control core of the terminal. It is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to achieve corresponding Method flow or corresponding function; in one embodiment, the above-mentioned processor 510 in the embodiment of the present invention may be used to perform a series of processing, including the method in the embodiment shown in FIG. 1 and FIG. 2 and so on.

The embodiment of the present invention also provides a computer storage medium (Memory). The above-mentioned computer storage medium is a memory device in a terminal for storing programs and data. It can be understood that the computer storage medium herein may include a built-in storage medium in the terminal, and of course, may also include an extended storage medium supported by the terminal. The computer storage medium provides storage space, and the storage space stores the operating system of the terminal. In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer storage medium here can be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory; optionally, it can also be at least one located far away from the aforementioned processor. Computer storage media.

In an embodiment, one or more instructions stored in the computer storage medium can be loaded and executed by the processor to implement the corresponding steps in the above-mentioned embodiments; in specific implementation, one or more instructions in the computer storage medium can be executed by The processor loads and executes any steps of the method in FIG. 1 and/or FIG. 2, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the device and module described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided by the present invention, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the division of the modules is only a logical function division, and there can be other divisions in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not. implement. The displayed or discussed mutual coupling, or direct coupling, or communication connection may be indirect coupling or communication connection through some interfaces, devices or modules, and may be in electrical, mechanical, or other forms.

The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In the foregoing embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be sent from a website, computer, server, or data center to another via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) A website, computer, server or data center for transmission. The computer-readable storage medium may be any usable medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more usable media. The usable medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, for example, Digital versatile disc (DVD), or semiconductor media, for example, solid state disk (SSD), etc.

Claims

A method for signal nonlinearity compensation, which is characterized in that it includes:

Acquiring a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal;

Acquiring the first non-linear parameter of the first speaker;

Performing compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is output by the first speaker.
The signal nonlinearity compensation method according to claim 1, wherein the method further comprises:

Perform frequency response correction processing on the first channel audio signal according to the second nonlinear parameter of the first speaker to obtain the first channel output signal, and the second nonlinear parameter of the first speaker is based on The expected response of the first speaker is estimated.
The signal nonlinearity compensation method according to claim 2, wherein the frequency response correction process is performed on the first channel audio signal according to the second nonlinear parameter of the first speaker to obtain the The first channel output signal includes:

Predicting the state variable of the first speaker;

Constructing the first channel target signal according to the first channel audio signal, the state variable of the first speaker and the second non-linear parameter of the first speaker;

Filtering the first channel target signal according to the state variable of the first speaker and the first non-linear parameter of the first speaker to obtain the first channel output signal.
The signal nonlinearity compensation method according to claim 2, wherein the performing frequency response correction processing on the first channel audio signal according to the second nonlinear parameter of the first speaker comprises:

Based on the linear filter, adjust the T/S parameter according to the second non-linear parameter of the first speaker, and perform frequency response correction processing on the first channel audio signal; or,

Based on the non-linear filter, by adjusting the characteristic curve of the first non-linear parameter of the first speaker, the frequency response correction processing is performed on the first channel audio signal.
The method for signal nonlinearity compensation according to any one of claims 1 to 4, wherein before said obtaining the first channel audio signal, the method further comprises:

Acquiring an original first channel audio signal, where the first channel audio signal is an original left channel audio signal or an original right channel audio signal;

Perform stereo enhancement processing on the original first channel audio signal to obtain the first channel audio signal after stereo enhancement.
The signal nonlinearity compensation method according to claim 1, wherein the first nonlinear parameter of the first speaker comprises:

The nonlinear parameter of the first speaker obtained by offline testing, or the nonlinear parameter of the first speaker updated online.
The signal nonlinearity compensation method according to claim 6, characterized in that, when the nonlinear parameter of the first speaker is updated online, the method further comprises:

Acquire the condition parameter of the first speaker, and update the nonlinear parameter of the first speaker according to the first condition parameter and a preset mapping relationship between the first speaker condition parameter and the nonlinear parameter, where the condition parameter includes But it is not limited to one or more of the ambient temperature, working time, and dynamic range of input signal power.
A signal nonlinearity compensation device is characterized in that it comprises:

An acquiring module, configured to acquire a first channel audio signal, where the first channel audio signal is a left channel audio signal or a right channel audio signal;

The acquiring module is used to acquire the first non-linear parameter of the first speaker;

The nonlinear compensation module is configured to perform compensation processing on the first channel audio signal according to the first nonlinear parameter of the first speaker to obtain a first channel output signal, and the first channel output signal is The first speaker output.
A storage medium storing a computer instruction program, wherein when the computer instruction program is executed by a processor, the processor executes the steps of the method according to any one of claims 1 to 7.
A computer device, characterized by comprising at least one memory and at least one processor, the memory stores a computer instruction program, and when the computer instruction program is executed by the processor, the processor executes the Steps of the method described in any one of 1 to 7.