CN107566952B - Audio signal processing method and device - Google Patents

Abstract

The disclosure relates to an audio signal processing method and device, and belongs to the technical field of computers. The method comprises the following steps: adjusting the first audio signal according to the first adjusting coefficient through an amplifying/attenuator to obtain a second audio signal; performing analog-to-digital conversion on the second audio signal through an analog-to-digital converter (ADC) to obtain a third audio signal; determining a second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal to represent the difference between the statistical volume value and the target volume value; and adjusting the collected audio signal according to the second adjusting coefficient through the amplifying/attenuator. The statistical volume value of the third audio signal is used as feedback, and the subsequent second adjusting coefficient of the amplifying/attenuating device is determined, so that the volume value of the output audio signal is as close to the target volume value as possible, the too large or too small volume of the output audio signal is avoided, and the problems of sound burst and distortion are avoided.

Description

Audio signal processing method and device

technical field

The present disclosure relates to the field of computer technology, and in particular, to an audio signal processing method and apparatus.

Background technique

Recording refers to the process of converting sound into electrical signals. Most of the current devices have a recording function, which can use the configured microphone to collect the sound and convert the sound into an audio signal.

The terminal may include a microphone and an ADC (Analog to Digital Converter, analog/digital converter). The microphone is used to collect sound to obtain an analog audio signal, and the ADC is used to convert the analog audio signal to obtain a digital audio signal. The signal is the recording result.

The above analog-to-digital conversion process is limited by the volume range that can be converted by the ADC, and the volume of the recorded sound at the terminal may vary from time to time. Popping sound occurs, and if the volume of the sound is less than the minimum volume value that the ADC can convert, it will cause the converted digital audio signal to be distorted.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the related art, the present disclosure provides an audio signal processing method and apparatus. The technical solution is as follows:

According to a first aspect of the embodiments of the present disclosure, an audio signal processing method is provided, the method comprising:

Through the configured amplifier/attenuator, adjust the first audio signal collected by the microphone according to the first adjustment coefficient to obtain the second audio signal;

Perform analog-to-digital conversion on the second audio signal by using the configured analog-to-digital converter ADC to obtain a third audio signal;

According to the statistical volume value and the target volume value of the third audio signal, a second adjustment coefficient of the amplifier/attenuator is determined, and the second adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value the size of the difference;

Through the amplifier/attenuator, the audio signal collected by the microphone is adjusted according to the second adjustment coefficient.

In another embodiment, the first audio signal collected by the microphone is adjusted according to the first adjustment coefficient through the configured amplifier/attenuator to obtain the second audio signal, including:

According to the first adjustment coefficient, the following formula is applied to adjust the first audio signal to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient.

In another embodiment, the method further includes:

Taking the maximum value of the volume values of multiple sampling points in the third audio signal as the statistical volume value; or,

Taking the average value of the volume values of multiple sampling points in the third audio signal as the statistical volume value; or,

The square root of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal is obtained to obtain a statistical volume value.

In another embodiment, the determining the second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal includes:

Calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value;

The second adjustment coefficient is determined according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to the preset maximum adjustment coefficient and the preset minimum adjustment coefficient The adjustment factor range determined by the adjustment factor.

In another embodiment, calculating the candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal includes:

According to the statistical volume value and the target volume value of the third audio signal, apply the following formula to calculate the candidate adjustment coefficient:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

In another embodiment, the determining the second adjustment coefficient according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient includes:

If the candidate adjustment coefficient is greater than the preset maximum adjustment coefficient, the preset maximum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is smaller than the preset minimum adjustment coefficient, the preset minimum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is not larger than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment coefficient.

According to a second aspect of the embodiments of the present disclosure, there is provided an audio signal processing apparatus, the apparatus includes: a signal collection module and a signal feedback module, the signal collection module includes a microphone, an amplifier/attenuator and an analog-to-digital converter ADC ;

The output end of the microphone is connected to the input end of the amplifier/attenuator, the output end of the amplifier/attenuator is respectively connected to the input end of the ADC, and the output end of the ADC is connected to the signal feedback module ;

the microphone for collecting the first audio signal;

the amplifier/attenuator, configured to adjust the first audio signal collected by the microphone according to the first adjustment coefficient to obtain a second audio signal;

the analog-to-digital converter ADC, for performing analog-to-digital conversion on the second audio signal to obtain a third audio signal;

The signal feedback module is configured to determine the second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal, where the second adjustment coefficient is used to represent the statistical volume the magnitude of the difference between the value and the target volume value;

The amplifier/attenuator is further configured to adjust the audio signal collected by the microphone according to the second adjustment coefficient.

In another embodiment, the amplifier/attenuator is further configured to apply the following formula to adjust the first audio signal according to the first adjustment coefficient to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient.

In another embodiment, the signal feedback module is further configured to use the maximum value of the volume values of multiple sampling points in the third audio signal as the statistical volume value; The average value of the volume values of the sampling points is used as the statistical volume value; or, the square root of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal is obtained to obtain the statistical volume value.

In another embodiment, the signal feedback module is further configured to calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the statistical volume value and the target volume value; determine the second adjustment coefficient according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to the The range of adjustment coefficients determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient.

In another embodiment, the signal feedback module is further configured to calculate the candidate adjustment coefficient by applying the following formula according to the statistical volume value and the target volume value of the third audio signal:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

In another embodiment, the signal feedback module is further configured to use the preset maximum adjustment coefficient as the second adjustment coefficient if the candidate adjustment coefficient is greater than a preset maximum adjustment coefficient; If the adjustment coefficient is smaller than the preset minimum adjustment coefficient, the preset minimum adjustment coefficient is used as the second adjustment coefficient; if the candidate adjustment coefficient is not greater than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment coefficient.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

In the method and device provided in this embodiment, the audio signal collected by the microphone is adjusted according to the first adjustment coefficient through the configured amplifier/attenuator, and then analog-to-digital conversion is performed to obtain a third audio signal, and then the third audio signal is used as the third audio signal. The statistical volume value of the signal is used as feedback, the second adjustment coefficient is determined according to the statistical volume value of the third audio signal and the target volume value, and the audio signal subsequently collected by the microphone is adjusted by the amplifier/attenuator according to the second adjustment coefficient, The volume value of the output audio signal is made as close to the target volume value as possible, so as to avoid the volume of the output audio signal being too large or too small, and avoid the problems of popping and distortion.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a flowchart of an audio signal processing method according to an exemplary embodiment;

FIG. 2 is a flowchart of an audio signal processing method according to an exemplary embodiment;

3 is a block diagram of an audio signal processing apparatus according to an exemplary embodiment;

Fig. 4 is a block diagram of an audio signal processing apparatus according to an exemplary embodiment.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the present disclosure will be further described in detail below with reference to the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure, but not to limit the present disclosure.

Embodiments of the present disclosure provide an audio signal processing method and apparatus, and the present disclosure will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart of an audio signal processing method according to an exemplary embodiment. As shown in FIG. 1 , the audio signal processing method is used in an audio signal processing apparatus, and includes the following steps:

In step 101, the first audio signal collected by the microphone is adjusted according to the first adjustment coefficient through the configured amplifier/attenuator to obtain the second audio signal.

In step 102, analog-to-digital conversion is performed on the second audio signal through the configured ADC to obtain a third audio signal.

In step 103, a second adjustment coefficient of the amplifier/attenuator is determined according to the statistical volume value and the target volume value of the third audio signal, and the second adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value size of the difference.

In step 104, through the amplifier/attenuator, the audio signal collected through the microphone is adjusted according to the second adjustment coefficient.

In the method provided in this embodiment, the audio signal collected by the microphone is adjusted according to the first adjustment coefficient by the configured amplifier/attenuator, and then analog-to-digital conversion is performed to obtain a third audio signal, and then the third audio signal is used as the third audio signal. The statistical volume value is used as feedback, and a second adjustment coefficient is determined according to the statistical volume value of the third audio signal and the target volume value. The second adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value. The amplifier/attenuator adjusts the subsequent audio signal collected by the microphone according to the second adjustment coefficient, so that the volume value of the output audio signal is as close to the target volume value as possible, avoiding the volume of the output audio signal being too large or too small , to avoid popping and distortion problems.

In another embodiment, the configured amplifier/attenuator adjusts the first audio signal collected by the microphone according to the first adjustment coefficient to obtain the second audio signal, including:

According to the first adjustment coefficient, the following formula is applied to adjust the first audio signal to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient.

In another embodiment, the method further includes:

The maximum value of the volume values of multiple sampling points in the third audio signal is used as the statistical volume value; or,

The average value of the volume values of multiple sampling points in the third audio signal is used as the statistical volume value; or,

The square root of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal is obtained to obtain the statistical volume value.

In another embodiment, determining the second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal includes:

Calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value;

The second adjustment coefficient is determined according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to the adjustment determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient Coefficient range.

In another embodiment, calculating the candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal includes:

According to the statistical volume value and the target volume value of the third audio signal, the following formula is applied to calculate the candidate adjustment coefficient:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

In another embodiment, determining the second adjustment coefficient according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient includes:

If the candidate adjustment coefficient is greater than the preset maximum adjustment coefficient, the preset maximum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is smaller than the preset minimum adjustment coefficient, the preset minimum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is not greater than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment coefficient.

All the above-mentioned optional technical solutions can be combined arbitrarily to form optional embodiments of the present disclosure, which will not be repeated here.

FIG. 2 is a flowchart of an audio signal processing method according to an exemplary embodiment. As shown in FIG. 2 , the audio signal processing method is used in an audio signal processing apparatus, and the audio signal processing apparatus may be a recording function. Any device, such as a mobile phone, a tablet computer, a recorder, etc., is not limited in this embodiment. The audio signal processing device includes a signal collection module and a signal feedback module, and the signal collection module includes a microphone, an amplifier/attenuator and an ADC. The method includes the following steps:

In step 201, a first audio signal is collected through the configured microphone.

In this embodiment, the audio signal processing device is configured with a microphone, through which the sound of the surrounding environment can be collected, and the collected sound can be converted into an analog audio signal. This embodiment takes the collection of the first audio signal as an example.

In step 202, the collected first audio signal is adjusted according to the first adjustment coefficient through the configured amplifier/attenuator to obtain the second audio signal.

In this embodiment, in order to facilitate obtaining an audio signal with a suitable volume, an amplifier/attenuator may be configured to adjust the collected audio signal, and re-determine the amplification/attenuation according to the volume value of the output audio signal and the target volume value The adjustment coefficient of the controller is used to adjust the subsequently collected audio signal by applying the newly determined adjustment coefficient. Through continuous adjustment, the volume value of the output audio signal can be close to the target volume value, thereby preventing the volume of the audio signal from being too large or too small. This embodiment only collects the first audio signal for the first time, obtains the third audio signal through the first adjustment coefficient of the amplifier/attenuator and analog-to-digital conversion, and determines the second audio signal of the amplifier/attenuator according to the third audio signal The adjustment coefficient is taken as an example for description.

Step 202 may include: according to the first adjustment coefficient, applying the following formula to adjust the first audio signal to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient. The first adjustment coefficient may be the adjustment coefficient used by the amplifier/attenuator when the audio signal processing apparatus first collects the audio signal, which may be predetermined by the audio signal processing apparatus, or determined by the user's settings, such as the The first adjustment coefficient may be 0, which is not limited in this embodiment.

In step 203, analog-to-digital conversion is performed on the second audio signal through the configured ADC to obtain a third audio signal, and the third audio signal is output.

The first audio signal and the second audio signal are both analog audio signals, and the second audio signal is subjected to analog-to-digital conversion to obtain a third audio signal that is a digital audio signal. At this time, the audio signal processing device can output the first audio signal. Three audio signals. The output refers to outputting the third audio signal to the memory for storage, or outputting the third audio signal to the processor for processing, and the specific output mode may be determined according to actual application requirements, which is not limited in this embodiment.

In another embodiment, in order to prevent the volume of the collected audio signal from being too large or too small, the audio signal processing apparatus first collects the first audio signal and obtains the third audio signal, and then processes the third audio signal. for determining the second adjustment coefficient without outputting the third audio signal.

For example, the audio signal processing device can provide a sound audition stage for the user, collect the sound that the user tries to make, obtain a third audio signal, and then obtain a second adjustment coefficient, and then enter the formal recording stage, and apply the second adjustment coefficient to The user's voice is recorded.

In step 204, a second adjustment coefficient of the amplifier/attenuator is determined according to the statistical volume value and the target volume value of the third audio signal, and the second adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value size of the difference.

The statistical volume value refers to a value obtained by performing statistics on the volume values of a plurality of sampling points of the third audio signal, and the statistical volume value may reflect the volume of the third audio signal.

Acquiring the statistical volume value of the third audio signal may include: the audio signal processing device samples the third audio signal, and determines multiple sampling points, thereby acquiring the volume values of multiple sampling points. The volume value of each sampling point is counted to obtain the statistical volume value.

Further, performing statistics on the volume values of the multiple sampling points to obtain the statistical volume value, which may include: taking the maximum value of the volume values of the multiple sampling points in the third audio signal as the statistical volume value, that is, SP _au =max( D _au (1), D _au (2),..., D _au (M)); wherein, SP _au is used to represent the statistical volume value, and D _au (i) represents the ith sampling point in the third audio signal volume value.

Alternatively, the average value of the volume values of multiple sampling points in the third audio signal is taken as the statistical volume value, that is,

Or, take the square root of the sum of the squares of the volume values of multiple sampling points in the third audio signal to obtain the statistical volume value, that is,

The target volume value may be determined according to the volume value of a general audio signal, or determined according to the volume value of an audio signal with a better processing effect, which is not limited in this embodiment.

The smaller the difference between the statistical volume value and the target volume value is, the closer the volume of the third audio signal is to the target volume, and the greater the difference between the statistical volume value and the target volume value is, it means that the volume of the third audio signal is similar to that of the target volume. The greater the difference in target volume, the need to re-determine the adjustment factor of the amplifier/attenuator.

In practical applications, the amplifier/attenuator is limited by its performance, and its adjustment coefficient cannot be infinitely increased or infinitely enhanced, and usually has an upper limit and a lower limit. Therefore, the audio signal processing device can be based on the amplifier/attenuator. The performance determines the preset maximum adjustment coefficient and the preset minimum adjustment coefficient. The preset maximum adjustment coefficient and the preset minimum adjustment coefficient can determine the adjustment coefficient range of the amplifier/attenuator. When determining the adjustment coefficient, it is necessary to ensure that the determined The adjustment factor cannot exceed the adjustment factor range. To this end, this step 204 may include the following steps 2041 and 2042:

2041. Calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the size of the difference between the statistical volume value and the target volume value.

For example, according to the statistical volume value and the target volume value of the third audio signal, the following formula is applied to calculate the candidate adjustment coefficient:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

Using the above formula can ensure that when the volume of the recorded sound is too large, SP _au is greater than SP _target , the calculated second adjustment coefficient K _amp ' is less than 0, and the amplifier/attenuator can attenuate the audio signal according to the second adjustment coefficient , and the larger SP _au is, the smaller the second adjustment coefficient is, so that the amplifier/attenuator attenuates the signal to a greater degree. And the volume of the recorded sound is too small, SP _au is smaller than SP _target , the calculated second adjustment coefficient K _amp ' is greater than 0, the amplifier/attenuator amplifies the hard disk signal according to the second adjustment coefficient, and the smaller SP _au is, The larger the second adjustment coefficient is, the greater the degree to which the amplifier/attenuator amplifies the signal.

2042. Determine the second adjustment coefficient according to the candidate adjustment coefficient, the preset maximum adjustment coefficient, and the preset minimum adjustment coefficient, so that the second adjustment coefficient is determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient. range of adjustment factors.

For example, if the candidate adjustment coefficient is larger than the preset maximum adjustment coefficient, the preset maximum adjustment coefficient is used as the second adjustment coefficient; if the candidate adjustment coefficient is smaller than the preset minimum adjustment coefficient, the preset minimum adjustment coefficient is used as the second adjustment coefficient. the second adjustment coefficient; if the candidate adjustment coefficient is not greater than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment coefficient. Pseudocode for determining the second adjustment factor may be as follows:

if(K _amp '>K _ampMAX )

K _amp =K _ampMAX ;

else if(K _amp '<K _ampMIN )

K _amp =K _ampMIN ;

else

K _amp = K _amp ';

Wherein, K _ampMAX and K _ampMIN are the preset maximum adjustment coefficient and the preset minimum adjustment coefficient of the amplifier/attenuator, respectively.

In order to ensure that the finally determined second adjustment coefficient falls within the range of the adjustment coefficient, the adjustment coefficient calculated according to the statistical volume value and the target volume value of the third audio signal is not directly used as the second adjustment coefficient, but is first used as a The candidate adjustment coefficient is finally determined by comparing the candidate adjustment coefficient with the preset maximum adjustment coefficient and the preset minimum adjustment coefficient.

In step 205, when the fourth audio signal is collected through the microphone, the fourth audio signal is adjusted according to the second adjustment coefficient through the amplifier/attenuator to obtain a fifth audio signal.

In step 206, analog-to-digital conversion is performed on the fifth audio signal through the configured ADC to obtain a sixth audio signal, and the sixth audio signal is output.

After the second adjustment coefficient is determined, the second adjustment coefficient can be applied to the processing of the audio signal collected next time. Taking the fourth audio signal collected by the microphone as an example, the fourth audio signal is processed in step 205- 206 is similar to the above steps 201-203, except that the adjustment coefficient applied by the amplifier/attenuator is changed.

When the first audio signal is processed by the above steps 201-203, the obtained statistical volume value of the third audio signal has a certain difference from the target volume value, and the subsequent steps 205-206 are used to process the collected fourth audio signal. Processing, if the fourth audio signal is close to the first audio signal, the volume value of the output sixth audio signal will be resolved at the target volume value.

Since the volume of the sound rarely changes abruptly when recording sound in daily life, the volume of the continuously collected audio signals is not much different, and the method provided in this embodiment is used to determine the amplification/ The adjustment coefficient of the attenuator is applied to the audio signal collected next time, which can ensure that the volume of the audio signal output next time is close to the target volume, avoiding the problem that the volume is too large or too small, and there will be no popping or distortion.

It should be noted that this embodiment is only described for an example where a signal collection module includes an amplifier/attenuator and an ADC. In fact, a device may include multiple signal collection modules, and through the multiple signal collection modules Multi-channel audio signals are recorded, and each signal collection module may include multiple amplifiers/attenuators, correspondingly including multiple ADCs, and each ADC is connected to the signal feedback module.

The multiple signal collection modules may be connected to different signal feedback modules, or the multiple signal collection modules may be connected to the same signal feedback module, for example, each signal collection module includes multiple amplifiers/attenuators and multiple ADC, each ADC is connected to the same signal feedback module, and the output audio signal will be sent to the signal feedback module, then the signal feedback module adopts a multi-tasking method to synchronously process the audio signals sent by multiple ADCs. After the audio signal determines the adjustment coefficient, it is sent to the amplifier/attenuator connected to the corresponding ADC, so as to re-determine the adjustment coefficient for the amplifier/attenuator.

In the method provided in this embodiment, the audio signal collected by the microphone is adjusted according to the first adjustment coefficient by the configured amplifier/attenuator, and then analog-to-digital conversion is performed to obtain a third audio signal, and then the third audio signal is used as the third audio signal. The statistical volume value is used as feedback, and the second adjustment coefficient is determined according to the statistical volume value and the target volume value of the third audio signal, and the audio signal collected by the microphone subsequently is adjusted by the amplifier/attenuator according to the second adjustment coefficient, so that the output The volume value of the audio signal is as close as possible to the target volume value, which avoids the volume of the output audio signal being too large or too small, and avoids the problems of popping and distortion.

Fig. 3 is a block diagram of an audio signal processing apparatus according to an exemplary embodiment. Referring to FIG. 3 , the apparatus includes: a signal collection module 301 and a signal feedback module 302 . The signal collection module 301 includes a microphone 3011 , an amplifier/attenuator 3012 and an ADC 3013 .

The output end of the microphone 3011 is connected to the input end of the amplifier/attenuator 3012, the output end of the amplifier/attenuator 3012 is connected to the input end of the ADC3013, and the output end of the ADC3013 is connected to the signal feedback module 302;

The microphone 3011 is used to collect the first audio signal;

The amplifier/attenuator 3012 is used to adjust the first audio signal collected by the microphone 3011 according to the first adjustment coefficient to obtain the second audio signal;

The ADC3013 is used to perform analog-to-digital conversion on the second audio signal to obtain a third audio signal;

The signal feedback module 302 is configured to determine the second adjustment coefficient of the amplifier/attenuator 3012 according to the statistical volume value and the target volume value of the third audio signal;

The amplifier/attenuator 3012 is further configured to adjust the audio signal collected by the microphone 3011 according to the second adjustment coefficient.

In another embodiment, the amplifier/attenuator 3012 is further configured to apply the following formula to adjust the first audio signal according to the first adjustment coefficient to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient.

In another embodiment, the signal feedback module 302 is further configured to use the maximum value of the volume values of the plurality of sampling points in the third audio signal as the statistical volume value; or, use the plurality of samples in the third audio signal The average value of the volume values of the points is used as the statistical volume value; or, the square root of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal is obtained to obtain the statistical volume value.

In another embodiment, the signal feedback module 302 is further configured to calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the statistical volume value and the target volume value The difference between the volume values; the second adjustment coefficient is determined according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to the preset maximum adjustment coefficient and the preset adjustment coefficient. Set the adjustment coefficient range determined by the minimum adjustment coefficient.

In another embodiment, the signal feedback module 302 is further configured to calculate the candidate adjustment coefficient by applying the following formula according to the statistical volume value and the target volume value of the third audio signal:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

In another embodiment, the signal feedback module 302 is further configured to use the preset maximum adjustment coefficient as the second adjustment coefficient if the candidate adjustment coefficient is greater than the preset maximum adjustment coefficient; if the candidate adjustment coefficient is smaller than the preset maximum adjustment coefficient If the minimum adjustment coefficient is set, the preset minimum adjustment coefficient is used as the second adjustment coefficient; if the candidate adjustment coefficient is not greater than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment factor.

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

It should be noted that: when the audio signal processing apparatus provided in the above embodiments processes audio signals, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated by different functional modules as required. , that is, dividing the internal structure of the device into different functional modules to complete all or part of the functions described above. In addition, the audio signal processing apparatus and the audio signal processing method embodiments provided by the above embodiments belong to the same concept, and the specific implementation process thereof is detailed in the method embodiments, which will not be repeated here.

FIG. 4 is a block diagram of an audio signal processing apparatus 400 according to an exemplary embodiment. For example, apparatus 400 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, fitness device, personal digital assistant, and the like.

4, the apparatus 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input/output (I/O) interface 412, a sensor component 414, and communication component 416 .

The processing component 402 generally controls the overall operation of the device 400, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to perform all or some of the steps of the methods described above. Additionally, processing component 402 may include one or more modules that facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

Memory 404 is configured to store various types of data to support operations at device 400 . Examples of such data include instructions for any application or method operating on device 400, contact data, phonebook data, messages, pictures, videos, and the like. Memory 404 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

Power supply assembly 406 provides power to various components of device 400 . Power supply components 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to device 400 .

Multimedia component 408 includes screens that provide an output interface between the device 400 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swipe, and gestures on the touch panel. The touch sensor may not only sense the boundaries of a touch or swipe action, but also detect the duration and pressure associated with the touch or swipe action. In some embodiments, multimedia component 408 includes a front-facing camera and/or a rear-facing camera. When the apparatus 400 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each of the front and rear cameras can be a fixed optical lens system or have focal length and optical zoom capability.

Audio component 410 is configured to output and/or input audio signals. For example, audio component 410 includes a microphone (MIC) that is configured to receive external audio signals when device 400 is in operating modes, such as call mode, recording mode, and voice recognition mode. The received audio signal may be further stored in memory 404 or transmitted via communication component 416 . In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

The I/O interface 412 provides an interface between the processing component 402 and a peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to: home button, volume buttons, start button, and lock button.

Sensor assembly 414 includes one or more sensors for providing status assessment of various aspects of device 400 . For example, the sensor assembly 414 can detect the open/closed state of the device 400, the relative positioning of the components, such as the display and keypad of the device 400, the sensor assembly 414 can also detect the position change of the device 400 or a component of the device 400, Presence or absence of user contact with device 400 , device 400 orientation or acceleration/deceleration and temperature changes of device 400 . Sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 416 is configured to facilitate wired or wireless communication between apparatus 400 and other devices. Device 400 may access wireless networks based on communication standards, such as WiFi, 2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 416 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, apparatus 400 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation is used to perform the above method.

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory 404 including instructions, executable by the processor 420 of the apparatus 400 to perform the method described above. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

A non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of a terminal, the terminal can execute an audio signal processing method, the method comprising:

Through the configured amplifier/attenuator, adjust the first audio signal collected by the microphone according to the first adjustment coefficient to obtain the second audio signal;

Perform analog-to-digital conversion on the second audio signal through the configured analog-to-digital converter ADC to obtain a third audio signal;

Determine the second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal;

Through the amplifier/attenuator, the audio signal collected by the microphone is adjusted according to the second adjustment coefficient.

In another embodiment, the configured amplifier/attenuator adjusts the first audio signal collected by the microphone according to the first adjustment coefficient to obtain the second audio signal, including:

According to the first adjustment coefficient, the following formula is applied to adjust the first audio signal to obtain the second audio signal:

Wherein, Au _amp is used to represent the second audio signal, Au is used to represent the first audio signal, and K _amp1 is used to represent the first adjustment coefficient.

In another embodiment, the method further includes:

The maximum value of the volume values of multiple sampling points in the third audio signal is used as the statistical volume value; or,

The average value of the volume values of multiple sampling points in the third audio signal is used as the statistical volume value; or,

The square root of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal is obtained to obtain the statistical volume value.

In another embodiment, determining the second adjustment coefficient of the amplifier/attenuator according to the statistical volume value and the target volume value of the third audio signal includes:

Calculate a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent the difference between the statistical volume value and the target volume value;

The second adjustment coefficient is determined according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to the adjustment determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient Coefficient range.

In another embodiment, calculating the candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal includes:

According to the statistical volume value and the target volume value of the third audio signal, the following formula is applied to calculate the candidate adjustment coefficient:

Wherein, K _amp ' is used to represent the second adjustment coefficient, SP _au is used to represent the statistical volume value, and SP _target is used to represent the target volume value.

In another embodiment, determining the second adjustment coefficient according to the candidate adjustment coefficient, the preset maximum adjustment coefficient and the preset minimum adjustment coefficient includes:

If the candidate adjustment coefficient is greater than the preset maximum adjustment coefficient, the preset maximum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is smaller than the preset minimum adjustment coefficient, the preset minimum adjustment coefficient is used as the second adjustment coefficient;

If the candidate adjustment coefficient is not greater than the preset maximum adjustment coefficient and not smaller than the preset minimum adjustment coefficient, the candidate adjustment coefficient is used as the second adjustment coefficient.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (8)

1. An audio signal processing method, which is applied in a sound recording process, the method comprising:

adjusting the first audio signal collected by the microphone according to the first adjusting coefficient through the configured amplifying/attenuator to obtain a second audio signal;

performing analog-to-digital conversion on the second audio signal through a configured analog-to-digital converter (ADC) to obtain a third audio signal;

calculating a candidate adjustment coefficient according to the statistical volume value and the target volume value of the third audio signal by applying the following formula:

wherein, K_amp' for indicating a candidate adjustment coefficient, SP_auFor representing said statistical volume value, SP_targetFor representing the target volume value;

the candidate adjustment coefficients are used to represent a difference between the statistical loudness value and the target loudness value;

determining a second adjustment coefficient according to the candidate adjustment coefficient, a preset maximum adjustment coefficient and a preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to an adjustment coefficient range determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient;

and adjusting the audio signal collected by the microphone according to the second adjusting coefficient through the amplifying/attenuator.

2. The method of claim 1, wherein the adjusting, by the configured amplifier/attenuator, the first audio signal collected by the microphone according to the first adjustment coefficient to obtain the second audio signal comprises:

according to the first adjusting coefficient, the following formula is applied to adjust the first audio signal to obtain the second audio signal:

wherein, Au_ampFor representing the second audio signal, Au for representing the first audio signal, K_amp1For representing the first adjustment factor.

3. The method of claim 1, further comprising:

taking the maximum value of the volume values of the plurality of sampling points in the third audio signal as a statistical volume value; or,

taking the average value of the volume values of a plurality of sampling points in the third audio signal as a statistical volume value; or,

and solving the square of the sum of the squares of the volume values of the plurality of sampling points in the third audio signal to obtain a statistical volume value.

4. The method according to claim 1, wherein determining the second adjustment coefficient according to the candidate adjustment coefficient, a preset maximum adjustment coefficient and a preset minimum adjustment coefficient comprises:

if the candidate adjustment coefficient is larger than a preset maximum adjustment coefficient, taking the preset maximum adjustment coefficient as the second adjustment coefficient;

if the candidate adjusting coefficient is smaller than a preset minimum adjusting coefficient, taking the preset minimum adjusting coefficient as the second adjusting coefficient;

and if the candidate adjusting coefficient is not larger than the preset maximum adjusting coefficient and not smaller than the preset minimum adjusting coefficient, taking the candidate adjusting coefficient as the second adjusting coefficient.

5. An audio signal processing apparatus, wherein the apparatus is used in a sound recording process, the apparatus comprising: the signal acquisition module comprises a microphone, an amplifier/attenuator and an analog-to-digital converter (ADC);

the output end of the microphone is connected with the input end of the amplification/attenuation device, the output end of the amplification/attenuation device is respectively connected with the input end of the ADC, and the output end of the ADC is connected with the signal feedback module;

the microphone is used for acquiring a first audio signal;

the amplification/attenuator is used for adjusting the first audio signal collected by the microphone according to a first adjustment coefficient to obtain a second audio signal;

the analog-to-digital converter ADC is used for performing analog-to-digital conversion on the second audio signal to obtain a third audio signal;

the signal feedback module is configured to calculate a candidate adjustment coefficient according to the statistical volume value and a target volume value of the third audio signal, where the candidate adjustment coefficient is used to represent a difference between the statistical volume value and the target volume value; determining a second adjustment coefficient according to the candidate adjustment coefficient, a preset maximum adjustment coefficient and a preset minimum adjustment coefficient, so that the second adjustment coefficient belongs to an adjustment coefficient range determined by the preset maximum adjustment coefficient and the preset minimum adjustment coefficient;

the amplification/attenuator is further used for adjusting the audio signal collected by the microphone according to the second adjustment coefficient;

the signal feedback module is further configured to calculate a candidate adjustment coefficient by applying the following formula according to the statistical volume value and the target volume value of the third audio signal:

wherein, K_amp' for representing said candidate adjustment coefficient, SP_auFor representing said statistical volume value, SP_targetFor representing the target volume value.

6. The apparatus of claim 5, wherein the amplifier/attenuator is further configured to adjust the first audio signal according to the first adjustment coefficient by applying the following formula to obtain the second audio signal:

wherein, Au_ampFor representing the second audio signal, Au for representing the first audio signal, K_amp1For representing the first adjustment factor.

7. The apparatus of claim 5, wherein the signal feedback module is further configured to take a maximum value of the volume values of the plurality of sampling points in the third audio signal as a statistical volume value; or, taking the average value of the volume values of a plurality of sampling points in the third audio signal as a statistical volume value; or, the open square is obtained for the square sum of the volume values of the plurality of sampling points in the third audio signal, so as to obtain the statistical volume value.

8. The apparatus of claim 5, wherein the signal feedback module is further configured to use the preset maximum adjustment coefficient as the second adjustment coefficient if the candidate adjustment coefficient is greater than the preset maximum adjustment coefficient; if the candidate adjusting coefficient is smaller than a preset minimum adjusting coefficient, taking the preset minimum adjusting coefficient as the second adjusting coefficient; and if the candidate adjusting coefficient is not larger than the preset maximum adjusting coefficient and not smaller than the preset minimum adjusting coefficient, taking the candidate adjusting coefficient as the second adjusting coefficient.

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