TW202320555A - Recording method, and associated audio processing circuit - Google Patents

Abstract

A recording method and an associated audio processing circuit are provided. The recording method may include: at a first time point, initializing the audio processing circuit; at a second time point, setting a gain of the audio processing circuit to be a first value; at a third time point, utilizing the audio processing circuit to start recording; at a fourth time point, completing the initialization of the audio processing circuit; and at a fifth time point, adjusting the gain of the audio processing circuit to be a second value; wherein, the second value is greater than the first value; wherein, the first time point and the second time point are earlier than the third time point, the fourth time point is later than the third time point, and the fifth time point is later than the third time point.

Description

Recording method and audio processing circuit

The invention relates to recording control, in particular to a recording method and related audio processing circuits.

According to the related art, a portable recording device can be used for recording in various occasions. However, certain problems may occur. For example, when the user controls to start using the portable recording device to record, the user needs to wait for the portable recording device to be ready to enter the working state, which wastes the user's time. Some proposals have been made in the related art to try to solve this problem, but may cause additional problems such as some side effects, for example, noise generated in the case of improper control is recorded in the recording file. Therefore, there is a need for a novel method and related architecture to realize a compact and reliable recording device with no side effects or less likely to cause side effects.

An object of the present invention is to provide a recording method and related audio processing circuit to solve the above problems.

An embodiment of the present invention provides a recording method, wherein the recording method is applied to an electronic device, and the electronic device includes an audio processing circuit. The recording method may include: at a first time point, initializing the audio processing circuit; at a second time point, setting a gain of the audio processing circuit to a first value; at a third time point, using the The audio processing circuit starts recording; at a fourth time point, the initialization of the audio processing circuit is completed; and at a fifth time point, the gain of the audio processing circuit is adjusted to a second value; wherein, the second value greater than the first numerical value; wherein, the first time point and the second time point are earlier than the third time point, the fourth time point is later than the third time point, and the fifth time point is later than the first time point three time points.

An embodiment of the present invention further provides the audio processing circuit operating according to the above recording method, wherein the audio processing circuit may include: at least one amplifier; at least an analog-to-digital converter coupled to the at least one amplifier; and a A processor coupled to the at least one analog-to-digital converter. For example, the at least one amplifier can be used to perform gain adjustment on at least one audio signal to generate at least one adjusted audio signal; the at least one analog-to-digital converter can be used to perform analog-to-digital conversion on the at least one adjusted audio signal to generate at least one a digital audio signal; and the processor is operable to control the operation of the audio processing circuit and perform audio processing based on audio samples carried by the at least one digital audio signal.

One of the advantages of the present invention is that, through a carefully designed control mechanism, the recording method and audio processing circuit of the present invention can properly manage the scheduling of related settings before and after recording. Compared with the related art, the recording method and the audio processing circuit of the present invention can realize a compact and reliable recording device without side effects or less likely to cause side effects.

FIG. 1 is a schematic diagram of an electronic device 10 according to an embodiment of the present invention. The electronic device 10 may include a plurality of components such as a user interface module 10U, a power module 10P, an integrated circuit 12, a microphone 14, a sound input port 15, a speaker 16 and a storage device 18, and the At least some of the components, such as the integrated circuit 12, the microphone 14, the audio input port 15, the speaker 16, and the storage device 18, may be mounted on a main (main) circuit board 10B of the electronic device 10, but this The invention is not limited thereto. In some embodiments, all of the plurality of components may be mounted on the main circuit board 10B. In addition, examples of the electronic device 10 may include (but not limited to): a video camera, a portable recording device, a wearable device, a multifunctional mobile phone, and the like.

As shown in Figure 1, the integrated circuit 12 may include an audio processing circuit 100, a user interface circuit 12U, and a storage interface circuit 12S, and the audio processing circuit 100 may include a processor 110, a dynamic random access memory Body (Dynamic Random Access Memory, referred to as DRAM) 112, at least one amplifier such as a preamplifier (preamplifier) 120 and a main amplifier 124, a multiplexer circuit 122 (marked as "MUX" for simplicity), at least one analog The digital converter (analog-to-digital converter, ADC for short) such as a plurality of ADCs 126L and 126R, and a digital-to-analog converter (DAC for short) 130 , but the invention is not limited thereto. For example, one or more bus bars may be provided in the architecture shown in FIG. 1 to allow related components therein to be coupled to each other.

The user interface module 10U may include at least one user input device (not shown) for receiving user input, and may include a display device (not shown) for displaying information to notify the user. For example, the at least one user input device may be implemented by a touch panel, buttons, etc., and the display device may be implemented by a display panel. In some examples, the touch panel and the display panel can be integrated into a touch-sensitive display device such as a touch screen. In addition, the power module 10P can provide power to other components in the electronic device 10 , such as the integrated circuit 12 and its sub-circuits and certain components coupled to the integrated circuit 12 . The microphone 14 can be used to receive audio waves for the electronic device 10 (such as the audio processing circuit 100) to generate one or more audio signals. In particular, it can be implemented as a stereo microphone to generate audio signals respectively corresponding to the left channel and the right channel. a first group of audio signals. The audio input port 15 can be used to couple the electronic device 10 (such as the audio processing circuit 100 ) to an audio source device (not shown) outside the electronic device 10 to receive a second set of audio signals from the audio source device. The storage device 18 can be used to store a plurality of audio files such as a plurality of recording files for the electronic device 10 (such as the audio processing circuit 100), wherein the audio processing circuit 100 can perform processing according to the first set of audio signals or the second set of audio signals. A recording operation is performed to generate the plurality of audio files. For example, the storage device 18 can be implemented by means of non-volatile memory such as flash memory. In addition, the speaker 16 can be used to play any audio file in the plurality of audio files for the electronic device 10 (such as the audio processing circuit 100 ), especially, receiving the audio file corresponding to any one of the audio files from the audio processing circuit 100 (such as the DAC 130 ). The at least one audio output signal is used to output audio waves for the user to listen to.

In the integrated circuit 12, the user interface circuit 12U can be used to couple the user interface module 10U to the audio processing circuit 100, and perform signal conversion between the audio processing circuit 100 and the user interface module 10U to allow The user interacts with the electronic device 10 through the user interface circuit 12U. The storage interface circuit 12S can be used to couple the storage device 18 to the audio processing circuit 100, and perform signal conversion between the audio processing circuit 100 and the storage device 18, so as to allow the audio processing circuit 100 to use the storage device 18 to store files such as the multiple audio files. In addition, the audio processing circuit 100 can be used for audio processing, but the invention is not limited thereto. As shown in FIG. 1, the audio processing circuit 100 includes core components of the electronic device 10, such as a processor 110, DRAM 112, etc., and the processor 110 (for example, a program module running on it) can be used to control the electronic device 10 operation.

For audio processing, the at least one amplifier (eg, the preamplifier 120 and the main amplifier 124 ) can be used to adjust the gain of at least one audio signal to generate at least one adjusted audio signal. In particular, the preamplifier 120 may perform gain adjustments on the first set of audio signals to generate an adjusted set of audio signals corresponding to the first set of audio signals as a first adjusted version of the first set of audio signals , and, in the event that multiplexer circuit 122 selects and outputs the first adjusted version of the first set of audio signals, main amplifier 124 may perform gain adjustments on the first adjusted version of the first set of audio signals to generate another set of adjusted audio signals, which can be regarded as a second adjusted version of the first set of audio signals, wherein the other set of adjusted audio signals can be used as an example of the above-mentioned at least one adjusted audio signal, but this The invention is not limited thereto. In the case that the multiplexer circuit 122 selects and outputs the second set of audio signals, the main amplifier 124 can perform gain adjustment on the second set of audio signals to generate a set of adjusted audio signals corresponding to the second set of audio signals , wherein this group of adjusted audio signals can also be used as an example of the at least one adjusted audio signal. In addition, the at least one ADC (such as ADC 126L and 126R) can be used to perform analog-to-digital conversion on the at least one adjusted audio signal to generate at least one digital audio signal. In the case that any one of the first set of audio signals and the second set of audio signals (for example, each set of audio signals) is a stereo audio signal, the ADC 126L can correspond Analog-to-digital conversion is performed on a first adjusted audio signal of the left channel to generate a first digital audio signal corresponding to the left channel, and the ADC 126R can be used for either set of audio signals corresponding to the right The second adjusted audio signal of one of the channels is analog-to-digital converted to generate a second digital audio signal corresponding to the right channel. In addition, the processor 110 can be used to control the operation of the audio processing circuit 100 and perform audio processing according to the audio samples contained in the at least one digital audio signal (eg, the first digital audio signal and the second digital audio signal).

According to some embodiments, the main amplifier 124 may be implemented as a stereo boost amplifier.

According to some embodiments, the speaker 16 can be replaced by an audio output port (not shown in FIG. 1 ), and the audio output port can be used to couple the electronic device 10 (such as the audio processing circuit 100 ) to the electronic device 10. One of the external sound output devices, such as headphones, external speakers, sound system, etc.

FIG. 2 is a flow chart of a recording method according to an embodiment of the present invention, wherein the recording method is applied to the electronic device 10 shown in FIG. 1, especially, the audio processing circuit 100 therein, and the audio The processing circuit 100 can operate according to the recording method.

In step S11, the audio processing circuit 100 can be initialized at a first time point.

In step S12, the audio processing circuit 100 may set a gain to a first value at a second time point. For example, the gain is an analog gain, especially, the first value of the analog gain is a settable minimum value, but the invention is not limited thereto. For another example, the gain is a digital gain, especially, the first value of the digital gain is a settable minimum value.

In step S13, after the first time point and the second time point, the audio processing circuit 100 can start recording at a third time point, especially, in order to start recording earlier, the initialization is started but not completed Just start recording. Assuming that no gain setting is performed in step S12, a popping sound will be generated when recording starts. As shown in FIG. 2 , since the audio processing circuit 100 pre-sets the gain in step S12 , the audio processing circuit 100 can start recording earlier without generating popping sound, so as to save the user's time.

In step S14, the audio processing circuit 100 may complete initialization at a fourth time point.

In step S15, the audio processing circuit 100 may adjust the gain to a second value at a fifth time point, wherein the second value is greater than the first value.

According to this embodiment, the first time point and the second time point are earlier than the third time point, the fourth time point is later than the third time point, and the fifth time point is later than the third time point . In addition, the initialization may include enabling the at least one ADC (such as ADCs 126L and 126R), for example, turning on at least one switch (not shown) in the audio processing circuit 100 to start supplying power to the at least one ADC. In particular, if the gain is the analog gain, the analog gain may represent the gain of at least one amplifier (such as the preamplifier 120 and the main amplifier 124 ), but the invention is not limited thereto. For example, the audio processing circuit 100 may include a digital signal processing circuit (Digital Signal Processing IC). The aforementioned core elements of the electronic device 10 can be regarded as the digital signal processing circuit, and the digital signal processing circuit can include a processor 110, a DRAM 112, and the like. In case the gain is the digital gain, the digital gain may represent the gain of the digital audio processing performed by the digital signal processing circuit (eg processor 110 ).

For better understanding, the method can be illustrated by the workflow shown in FIG. 2 , but the present invention is not limited thereto. According to some embodiments, one or more steps may be added to the workflow shown in FIG. 2 .

According to some embodiments, the initialization may include configuring a plurality of hardware parameters stored in a plurality of storage units in the audio processing circuit 100 , and the plurality of hardware parameters may include the value of the gain. For the sake of brevity, similar content in these embodiments will not be repeated here.

According to some embodiments, the initialization of the audio processing circuit 100 is a first-stage initialization, and the initialization of the system code running on the processor 110 in the audio processing circuit 100 is a second-stage initialization. The recording method may further include: setting the gain of the digital audio processing performed by the processor 110 running the system code to zero. For example, the second-stage initialization may further include using the audio processing circuit 100 to gradually increase the gain of the digital audio processing from zero.

FIG. 3 shows a setting control scheme of the recording method shown in FIG. 2 according to an embodiment of the present invention. In order to facilitate understanding, the energy waves generated by the system (such as the noise generated when the hardware structure of the entire system has not yet reached a steady state during power-on) may be recorded in a recording file, and therefore the equivalent volume can be used to represent, where the horizontal axis may represent time, and the vertical axis may represent equivalent volume. In addition, the analog gain AGain and the digital gain DGain can be used as examples of the above-mentioned analog gain and digital gain, respectively. The audio processing circuit 100 can perform at least a part of a first group of audio processing operations, a second group of audio processing operations and a third group of audio processing operations respectively corresponding to time points _PA , P _B and _PC , for example Any one of the three groups of audio processing operations, any two groups of audio processing operations, or all of the audio processing operations. Preferably, the audio processing circuit 100 can at least perform the first set of audio processing operations corresponding to the time point _PA .

In the hardware initialization phase, for example at the time point _PA , the audio processing circuit 100 may perform an initial audio circuit setting to suppress the energy wave generated by the system, and the audio circuit initial setting may include the first group of audio processing operations: 1. Set fade in and fade out, for example, configure hardware parameters related to fade in and fade out among the multiple hardware parameters; 2. Lower the analog gain AGain and/or the digital gain DGain, for example, set it to a minimum value, for example, Configuring gain-related hardware parameters among the plurality of hardware parameters, such as analog gain AGain and digital gain DGain; and 3. enabling at least one ADC (such as ADC 126L and 126R); but the present invention is not limited thereto. As shown in Figure 3, the result of the system's energy wave being suppressed can also be represented by an equivalent volume, which is typically smaller than the energy wave produced by the system without the initial configuration of the audio circuit.

In the system software initialization stage, for example, at time point P _B , the audio processing circuit 100 can perform software settings to ensure the overall performance of audio processing, and the software settings can include the second group of audio processing operations: 1. Audio mute ( silence), for example, to forcibly turn off any possible volume, in particular, to maintain the analog gain AGain and/or the digital gain DGain at a low value, such as a minimum value; and 2. Gradually increase the volume (smooth up), wherein the A gain such as a digital gain DGain increases a certain value per unit time; but the present invention is not limited thereto. As shown in Figure 3, the upper volume limit of the audio samples will not exceed the result of the system's energy waves being suppressed. In the time interval from the time point P _B until the audio sample is not generated, the volume upper limit of the audio sample is typically equal to zero, because there is no audio sample in this time interval. In addition, the volume of the audio sample will not exceed the upper limit of the volume of the audio sample, and can be gradually increased with the operation of increasing the volume gradually. Gradual volume increase can avoid the sudden appearance of sound when recording normally after the audio is muted, so it can bring a better user experience. In one embodiment, the audio processing circuit 100 can calculate the audio samples in this stage according to the ratio, especially, by gradually increasing the ratio used to calculate the volume by gradually increasing the audio samples with a predefined unit point (such as data points) (Proportion) parameter PROPORTION adjusts the ratio, so that the audio sample is gradually amplified from the small volume value to the actual volume value (in this case, the ratio reaches 100%). For example, the audio processing circuit 100 can pass the equation EQU (1) and EQU (2) Gradually increase the volume value by adjusting the ratio to avoid a few too large volume values causing crackling, as shown below: Val _new = Val _old * PROPORTION ＞＞ 15; and……………… EQU(1) PROPORTION += PROPORTTION_step_size ;……………… EQU(2) The symbols "Val _new " and "Val _old " represent the new gain value and the old gain value respectively, and the symbol ">>" represents the bit A bitwise right shift operation (for example, a bit shifting operation in the direction towards the least significant bit (LSB), which makes the value smaller), and the symbol "+ =" represents an addition assignment operation (for example, adding two numbers to the left and right of "+=" to make the latest value of the number to the left of "+="). The equation EQU(1) is used to control the size of the new gain value Val _new according to the old gain value Val _old , and the equation EQU(2) is used to control the proportional parameter PROPORTION through the step value PROPORTION_step_size of the proportional parameter PROPORTION, To control the size of the increase each time the latest gain value is calculated (for example, the new gain value Val _new in the equation EQU(1)). According to the equation EQU(2), the audio processing circuit 100 can gradually increase the ratio presented by (PROPORTION >> 15) in the equation EQU(1), for example, gradually amplify from a minimum value such as 0.003% to a maximum value such as 100% , to control the size of the new gain value Val _new .

Taking the unit point equal to 8 as an example, the step value PROPORTTION_step_size of the proportional parameter PROPORTION can be set to 1, and, taking the current proportional parameter PROPORTION increased to 16 as an example, first the audio samples contained in an audio chunk (audio chunk), Take 8 data points as a group to disassemble, and calculate multiple groups (each group of 8 data points) in this audio block. When the current ratio parameter PROPORTION is 16, the audio samples produced by this group at this stage can be equal to each original audio sample in this group multiplied by the current value of the ratio parameter PROPORTION (for example, 16) and then the bit is shifted right , where the displacement of the bit to the right can be equal to 15 bits; then, the next set of proportional parameter PROPORTION to be used can be equal to increasing the previous value of the proportional parameter PROPORTION (for example, 16) by a predetermined increment such as a step Value PROPORTION_step_size (for example, 1) and the number (for example, 17), then, the audio processing circuit 100 can perform similar operations for the next group of 8 data points, until each data point in this audio block has been scaled The calculation is converted to a volume adjustment result for the progressive volume increase.

After the system software initialization stage, for example, at time point P _C , the audio processing circuit 100 can set the working recording volume value to ensure that the recording operation can be performed normally, and setting the working recording volume value can include the third group of audio processing operations: 1. Adjusting the analog gain AGain and/or the digital gain DGain to a predetermined value (for example: a predetermined value based on a default setting or a user setting, which is typically not equal to zero); but the present invention is not limited thereto. After the audio processing circuit 100 completes the hardware initialization and the electronic device 10 has not yet completed the software initialization, after a predetermined time, the audio processing circuit 100 can set the gain (such as the analog gain AGain or the digital gain DGain) to a predetermined value, especially , respectively setting the analog gain AGain and/or the digital gain DGain to predetermined values (for example: predetermined values based on default settings or user settings).

Please note that the configuration of the audio processing circuit 100 for the time point (the third time point) of recording can be very flexible. For example, the initialization described in step S11 may include hardware initialization, the first time point may represent a time point before the time point _PA , and the second time point may represent the time point _PA . In this case, the audio processing circuit 100 may be configured to start recording after the time point _PA (for example, the third time point may be after the time point _PA ). Since the audio processing circuit 100 has turned down the analog gain AGain and/or the digital gain DGain at the time point _PA , the audio processing circuit 100 can start recording before the initialization is completed. As shown in FIG. 3, since the audio processing circuit 100 can pre-set the gain in step S12, especially, at the time point _PA , the analog gain AGain and/or the digital gain DGain are adjusted down, so the audio processing circuit 100 can be used at different times. Start recording early in the event of a pop to save the user's time.

For another example, the initialization described in step S11 may include system software initialization, the first time point may represent a certain time point before time point P _B (for example: the start time point of system software initialization), and the second time point The point may represent a point in time P _B . In this case, the audio processing circuit 100 can be configured to start recording after the time point P _B (for example, the third time point can be after the time point P _B ), especially, can be configured to start recording between the time points P _B and P Recording starts at a certain time point between _C (for example, the third time point may be between time points P _B and P _C ). Since the audio processing circuit 100 has already performed the audio input at the time point P _B , for example, forcibly turning off any possible volume, especially, maintaining the analog gain AGain and/or the digital gain DGain at a low value, the audio processing circuit 100 can start recording before initialization is complete. As shown in FIG. 3 , since the audio processing circuit 100 can pre-set the gain in step S12 , especially, the analog gain AGain and/or the digital gain DGain are kept at a minimum value at the time point P _B .

For another example, the initialization described in step S11 may include the first-stage initialization such as hardware initialization, especially, it also includes the subsequent second-stage initialization such as system software initialization. The first time point may represent the time before the time point _PA A certain time point, and the second time point may represent the time point P _A . In this case, the audio processing circuit 100 can be configured to start recording after the time point _PA (for example, the third time point can be after the time point _PA ), especially, can be configured to start recording after the time point _PA and P Recording starts at a certain time point between _C (for example, the third time point may be between time points _PA and P _C ). Since the audio processing circuit 100 has already turned down the analog gain AGain and/or the digital gain DGain at the time point _PA and the audio processing circuit 100 has already performed the audio input at the time point P _B , the audio processing circuit 100 can generate no popping sound. start recording early.

For ease of understanding, the four curves shown in Figure 3 can be drawn to indicate the energy waves generated by the system, the result of the energy waves being suppressed by the system, the upper limit of the volume of the audio samples, and the respective trends of the volume of the audio samples , but the present invention is not limited thereto. According to some embodiments, these four curves can be varied. For example, by gradually increasing the volume, the audio processing circuit 100 can avoid recording a sudden sound when recording normally after the audio is muted, thus bringing better user experience. No matter which time point this third time point is between time points P _B and P _C (for example: after time point P _B , the curve indicating the volume upper limit of the audio sample changes from zero to non-zero time point), the audio The volume of the sample can be gradually increased with the operation of gradually increasing the volume, wherein the curve indicating the upper volume limit of the audio sample can be correspondingly adjusted, for example, from Fig. 3 the curve indicating the upper limit of the volume of the audio sample encounters The time point of the curve indicating the volume of the audio sample starts to gradually rise to allow the curve indicating the volume of the audio sample to continue to rise, especially, according to (PROPORTION >> 15) to increase the proportion presented.

As shown in FIG. 3 , the time point P _B may be shown before the time point P _C , but the invention is not limited thereto. According to some embodiments, the time point P _B can be moved to the right, and can also be moved right after the time point P _C .

Figure 4 shows an example of an audio waveform without using this recording method, where the horizontal and vertical axes represent time and equivalent volume, respectively (marked as "t" and "Vol" for clarity) . In the absence of this recording method, the energy waves produced by the system are recorded in the archive of the recording. Since the hardware structure of the entire system has not yet reached a steady state, noises such as energy waves generated by the system are recorded in the recording files, which can cause users to hear short bursts (for example, similar to "Zi") when listening to the recording files beep, there will be a short spike in the waveform on the track). If the user is using the audio system to play, harsh popping sound will be generated suddenly, which can bring extremely poor user experience.

Figure 5 shows an example of an audio waveform when this recording method is used, where the horizontal and vertical axes represent time and equivalent volume (marked as "t" and "Vol" respectively for clarity). Compared to the audio waveform shown in Figure 4, the audio waveform in this example is quite flat. In the case of using this recording method, the energy wave generated by the system is suppressed, and the upper limit of the volume of the audio sample will not exceed the result of the suppression of the energy wave of the system, and the volume of the audio sample will not exceed the upper limit of the volume of the audio sample. So the energy waves generated by the system cannot be recorded in the audio file. In particular, the volume of the audio sample can be increased gradually with the operation of increasing the volume gradually, instead of suddenly increasing to a predetermined volume, which can further improve user experience.

One of the advantages of the present invention is that, through a carefully designed control mechanism, the recording method, audio processing circuit 100, integrated circuit 12 and electronic device 10 can properly manage the scheduling of related settings before and after recording. Compared with related technologies, the recording method, audio processing circuit 100 , integrated circuit 12 and electronic device 10 of the present invention can realize a compact and reliable recording device without or less likely to cause side effects. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

10: electronic device 10B: main circuit board 10P: power supply module 10U: user interface module 12: integrated circuit 12S: storage interface circuit 12U: user interface circuit 14: microphone 15: sound input port 16: speaker 18: Storage device 100: audio processing circuit 110: processor 112: dynamic random access memory (DRAM) 120: preamplifier 122: multiplexer circuit 124: main amplifier 126L, 126R: analog-to-digital converter (ADC) 130: Digital-to-analog converter (DAC) S11~S15: steps P _A , P _B , P _C : time point Vol: equivalent volume t: time

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a flowchart of a recording method according to an embodiment of the present invention, wherein the recording method is applied to an electronic device such as that shown in FIG. 1 . FIG. 3 shows a setting control scheme of the recording method shown in FIG. 2 according to an embodiment of the present invention. Fig. 4 shows an example of an audio waveform without using this recording method. Fig. 5 shows an example of an audio waveform in the case of adopting this recording method.

S11~S15: Steps

Claims (14)

A recording method applied to an electronic device, the electronic device includes an audio processing circuit, the recording method includes: At a first time point, initialize the audio processing circuit; at a second time point, setting a gain of the audio processing circuit to a first value; At a third time point, use the audio processing circuit to start recording; At a fourth time point, complete the initialization of the audio processing circuit; and At a fifth time point, adjusting the gain of the audio processing circuit to a second value; Wherein, the second value is greater than the first value; Wherein, the first time point and the second time point are earlier than the third time point, the fourth time point is later than the third time point, and the fifth time point is later than the third time point. The recording method as described in item 1 of the scope of the patent application, wherein the gain is an analog gain. The recording method as described in item 2 of the scope of the patent application, wherein the first value of the analog gain is a settable minimum value. The recording method described in claim 1 of the patent application, wherein the gain is a digital gain. The recording method as described in item 4 of the scope of the patent application, wherein the first value of the digital gain is a settable minimum value. The recording method described in claim 1, wherein the audio processing circuit includes at least one analog-to-digital converter; and the initialization further includes activating the at least one analog-to-digital converter. The recording method described in item 2 of the scope of patent application, wherein the audio processing circuit includes at least one amplifier; and the analog gain represents the gain of the at least one amplifier. The recording method described in item 4 of the scope of patent application, wherein the audio processing circuit includes a digital signal processing circuit; and the digital gain represents the gain of the digital audio processing performed by the digital signal processing circuit. The recording method described in item 1 of the scope of the patent application, wherein the initialization includes configuring a plurality of hardware parameters stored in a plurality of storage units in the audio processing circuit, and the plurality of hardware parameters include the value of the gain. The recording method described in item 1 of the scope of the patent application, wherein the gain is increased by a certain value per unit time. The recording method described in item 1 of the scope of the patent application also includes: After the audio processing circuit completes the hardware initialization and the electronic device has not completed the software initialization, the gain is set to a predetermined value after a predetermined time. The recording method as described in item 1 of the scope of patent application, wherein the initialization of the audio processing circuit belongs to a first-stage initialization, and the initialization of the system code running on a processor in the audio processing circuit belongs to a first-stage initialization Two-stage initialization; and the recording method further includes: The gain of digital audio processing performed by the processor running the system code is set to zero. The recording method described in claim 12 of the scope of the patent application, wherein the second stage initialization further includes using the audio processing circuit to gradually increase the gain of the digital audio processing from zero. The audio processing circuit operated according to the recording method described in item 1 of the scope of the patent application, wherein the audio processing circuit includes: at least one amplifier for adjusting the gain of at least one audio signal to generate at least one adjusted audio signal; at least one analog-to-digital converter, coupled to the at least one amplifier, for performing analog-to-digital conversion on the at least one adjusted audio signal to generate at least one digital audio signal; and A processor, coupled to the at least one analog-to-digital converter, is used to control the operation of the audio processing circuit, and perform audio processing according to the audio samples carried by the at least one digital audio signal.

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