TWI827997B - Recording method, and associated integrated 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 methods and integrated circuits

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

According to related technologies, a portable recording device can be used for recording in various situations. However, certain problems may occur. For example, when the user controls the portable recording device to start recording, the user needs to wait for the portable recording device to prepare to enter the working state, which wastes the user's time. Some suggestions have been made in the related art to try to solve this problem, but they may cause additional problems such as certain side effects, for example, noise generated under improper control is recorded in the recording file. Therefore, a novel method and related architecture are needed to realize a compact and reliable recording device without side effects or less likely to cause side effects.

One 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, completes the initialization of the audio processing circuit; and at a fifth time point, the audio The gain of the processing circuit is adjusted 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, and the fourth time point Later than the third time point, and the fifth time point is later than the third time point.

An embodiment of the present invention further provides the audio processing circuit operating according to the above-mentioned recording method, wherein the audio processing circuit may include: at least one amplifier; at least one analog-to-digital converter coupled to the at least one amplifier; and 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 can be used to control the operation of the audio processing circuit and perform audio processing based on the audio samples carried by the at least one digital audio signal.

One of the benefits 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 schedule of relevant settings before and after starting recording. Compared with related technologies, the recording method and audio processing circuit of the present invention can realize a compact and reliable recording device without side effects or with less possibility of side effects.

10: Electronic devices

10B: Main circuit board

10P:Power 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

Figure 1 is a schematic diagram of an electronic device according to an embodiment of the present invention.

Figure 2 is a flow chart 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 Figure 1 .

Figure 3 illustrates a setting control scheme of the recording method shown in Figure 2 according to an embodiment of the present invention.

Figure 4 shows an example of an audio waveform without using this recording method.

Figure 5 shows an example of an audio waveform when this recording method is adopted.

Figure 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 plurality of components, such as the integrated circuit 12, the microphone 14, the sound input port 15, the speaker 16 and the storage device 18, may be installed on a main circuit board 10B of the electronic device 10, but this invention The invention is not limited to this. 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 are not limited to): cameras, portable recording devices, wearable devices, multifunctional mobile phones, etc.

As shown in FIG. 1 , the integrated circuit 12 may include an audio processing circuit 100 , a user interface circuit 12U and a storage interface circuit 12S. The audio processing circuit 100 may include a processor 110 , a dynamic random access memory. Dynamic Random Access Memory (DRAM) 112, at least one amplifier such as a preamplifier 120 and a main amplifier 124, a multiplexer circuit 122 (labeled "MUX" for simplicity), at least one analog A digital converter (analog-to-digital converter, ADC for short) such as a plurality of ADCs 126L and 126R, and a digital-to-analog converter (digital-to-analog converter, DAC for short) 130, but the invention is not limited thereto. For example, one or more busbars may be disposed in the architecture shown in Figure 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 can be implemented by a touch panel, a button, etc., and the display device can be implemented by a display panel, etc. In some examples, the touch panel and the display panel may 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 coupled to certain components of integrated circuit 12 . The microphone 14 may 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, the microphone 14 may be implemented as a stereo microphone to generate audio signals corresponding to the left channel and the right channel respectively. a first set of audio signals. The sound 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) located 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 multiple audio files such as multiple recording files for the electronic device 10 (such as the audio processing circuit 100), wherein the audio processing circuit 100 can perform processing based on 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 may be implemented by a non-volatile memory such as a flash memory. In addition, the speaker 16 can be used to play any one of the plurality of audio files for the electronic device 10 (such as the audio processing circuit 100), and in particular, receive an audio signal corresponding to any one of the audio files from the audio processing circuit 100 (such as the DAC 130). 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 to allow the audio processing circuit 100 to utilize the storage device 18 to store files such as the plurality of files. audio files. In addition, the audio processing circuit 100 can be used to perform 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 , a 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 above-mentioned at least one amplifier (such as the preamplifier 120 and the main amplifier 124) can be used to perform gain adjustment on at least one audio signal to generate at least one adjusted audio signal. In particular, the preamplifier 120 may perform gain adjustment on the first set of audio signals to generate an audio signal corresponding to the first set of audio signals. A set of adjusted audio signals of the set of audio signals is used as a first adjusted version of one of the first set of audio signals, and the first adjusted version of the first set of audio signals is selected and output in the multiplexer circuit 122 version, the main amplifier 124 may perform gain adjustment on the first adjusted version of the first set of audio signals to produce another set of adjusted audio signals, which may be regarded as a second adjusted version of the first set of audio signals. version, 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 the invention is not limited thereto. In the case where 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 an adjusted set of audio signals corresponding to the second set of audio signals. , wherein this set of adjusted audio signals can also be used as an example of the above-mentioned at least one adjusted audio signal. In addition, the above-mentioned at least one ADC (such as ADC 126L and 126R) may be used to perform analog-to-digital conversion on the above-mentioned at least one adjusted audio signal to generate at least one digital audio signal. In the case where 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 The first adjusted audio signal in the left channel is subjected to analog-to-digital conversion to generate a first digital audio signal corresponding to the left channel, and the ADC 126R can be used in any set of audio signals corresponding to the right The second adjusted audio signal of one of the channels is subjected to analog-to-digital conversion 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 carried in the at least one digital audio signal (such as 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 a sound output port (not shown in FIG. 1 ), and the sound output port can be used to couple the electronic device 10 (such as the audio processing circuit 100 ) to the electronic device 10 An external sound output device, such as headphones, external speakers, sound systems, etc.

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

In step S11, the audio processing circuit 100 may 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, and in particular, 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, and in particular, 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. In particular, in order to start recording early, initialization is performed at the beginning but has not yet been completed. Just start recording. Assuming that no gain setting is performed in step S12, popping sounds will occur when recording is started. 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 early without generating popping sounds 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 . Additionally, the initialization may include enabling the at least one ADC (eg, 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, when the gain is an analog gain, the analog gain may represent the gain of at least one amplifier (eg, 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 above-mentioned core components of the electronic device 10 can be regarded as the digital signal processing circuit, and the The digital signal processing circuit may include the processor 110, DRAM 112, etc. In the case where the gain is a digital gain, the digital gain may represent a gain of 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 Figure 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 Figure 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 simplicity, 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.

Figure 3 illustrates a setting control scheme of the recording method shown in Figure 2 according to an embodiment of the present invention. For ease of understanding, energy waves generated by the system (such as noise generated when the entire system hardware structure has not reached a steady state during boot-up) may be recorded in a recording file, and therefore the equivalent volume can be used To represent, the horizontal axis can represent time, and the vertical axis can 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 may perform at least part of a first set of audio processing operations, a second set of audio processing operations, and a third set of audio processing operations respectively corresponding to time points _PA , _PB , and _PC , such as Any set of audio processing operations, any two sets of audio processing operations, or all audio processing operations among the three sets of audio processing operations. Preferably, the audio processing circuit 100 may perform at least a first set of audio processing operations corresponding to the time point P _A.

In the hardware initialization phase, for example, at time point _PA , the audio processing circuit 100 may perform audio circuit initialization to suppress energy waves generated by the system, and the audio circuit initialization may include the first set of audio processing operations: 1. Set the fade-in and fade-out, for example, configure the 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 the minimum value, for example, Configure the hardware parameters related to gain among the plurality of hardware parameters, such as the analog gain AGain and the digital gain DGain; and 3. Enable the above-mentioned at least one ADC (such as ADC 126L and 126R); but the invention is not limited thereto. As shown in Figure 3, the result of the system's energy wave being suppressed can also be expressed as an equivalent volume, and is typically smaller than the energy wave generated by the system without initial settings of the audio circuit.

In the system software initialization phase, 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 set of audio processing operations: 1. Audio default ( silence), for example, forcibly turning off any possible volume, in particular, maintaining the analog gain AGain and/or the digital gain DGain at a low value, such as the minimum value; and 2. Gradually increase the volume (smooth up), where the Gain such as digital gain DGain increases by a certain amount per unit time; but the present invention is not limited thereto. As shown in Figure 3, the upper limit of the audio sample volume will not exceed the result of the energy wave of the system being suppressed. In the time interval from time point P _B until the audio sample is not generated, the upper limit of the volume 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 audio sample volume, and can gradually increase with the operation of gradually increasing the volume. Gradually increasing the volume can avoid recording sudden sounds when recording normally after the audio is muted, thus providing a better user experience. In one embodiment, the audio processing circuit 100 can calculate the audio samples in this stage according to a ratio. In particular, the audio samples are divided into predefined unit points (such as data points) by gradually increasing the ratio used to calculate the volume. (Proportion) parameter PROPORTION to adjust the proportion to slowly amplify the audio sample from a small volume value to an actual volume value (in this case, the proportion reaches 100%). For example, the audio processing circuit 100 can use the equations EQU (1) and EQU (2), gradually increase the volume value by adjusting the proportion to avoid popping sounds caused by a few excessively large volume values, as shown below: Val _new =Val _old * PROPORTION>>15; and.... ............EQU(1)

PROPORTION+=PROPORTION_step_size;............EQU(2)The symbols "Val _new " and "Val _old " represent the new gain value and the old gain value respectively. The symbols ">>" represents a bitwise right shift operation (for example, a bit shifting operation in the direction toward the least significant bit (LSB), which can change the value small), and the symbol "+=" represents an addition assignment operation (for example, adding the two values to the left and right of "+=" respectively as the latest value of the value to the left of "+=") . The equation EQU(1) is used to control the size of the new gain value Val _new based on the old gain value Val _old , and the equation EQU(2) is used to control the proportion parameter PROPORTION through the step value PROPORTION_step_size of the proportion parameter PROPORTION. To control the size of the increase each time the latest gain value (such as the new gain value Val _new in equation EQU(1)) is calculated. According to equation EQU(2), the audio processing circuit 100 can gradually increase the ratio represented by (PROPORTION>>15) in equation EQU(1), for example, 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 PROPORTION_step_size of the proportion parameter PROPORTION can be set to 1, and taking the current proportion parameter PROPORTION rising to 16 as an example, firstly, the audio samples contained in an audio chunk (audio chunk), Take 8 data points as one The groups are split, and multiple groups (each group of 8 data points) in this audio block are calculated separately. When the current proportion 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 proportion parameter PROPORTION (for example, 16) and then the bit right shift is performed. , where the bit shift amount to the right may be equal to 15 bits; then, the next set of proportion parameters PROPORTION to be used may be equal to increasing the previous value of the proportion parameter PROPORTION (for example, 16) by a predetermined increment such as a step The value of PROPORTION_step_size (e.g., 1) results in a sum (e.g., 17). The audio processing circuit 100 can then perform similar operations on the next set of 8 data points until each data point in this audio block has been scaled. Calculates the volume adjustment result that is converted into a progressive increase in volume.

After the system software initialization phase, for example, at time point _PC , the audio processing circuit 100 can set the working recording level to ensure that the recording operation can be performed normally, and setting the working recording level can include the third set of audio processing operations: 1. Increase the analog gain AGain and/or the digital gain DGain to a predetermined value (for example: a predetermined value based on default settings or user settings, which is typically not equal to zero); but the invention is not limited thereto. After the audio processing circuit 100 completes the hardware initialization and the electronic device 10 has not 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 , the analog gain AGain and/or the digital gain DGain are respectively set to predetermined values (for example: based on default settings or predetermined values set by the user).

Please note that the audio processing circuit 100 can be very flexible in the configuration of the time point when recording is started (the third time point). 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 P _A (for example, the third time point may be after the time point P _A ). Since the audio processing circuit 100 has already lowered the analog gain AGain and/or the digital gain DGain at time point P _A , the audio processing circuit 100 can start recording before initialization is completed. As shown in FIG. 3 , since the audio processing circuit 100 can pre-set the gain in step S12 , in particular, the analog gain AGain and/or the digital gain DGain is lowered at the time point P _A , the audio processing circuit 100 can be set at any time. Start recording early when popping sounds occur 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 time point before time point P _B (for example: the start time point of system software initialization), and the second time point may A point may represent a time point P _B . In this case, the audio processing circuit 100 may be configured to start recording after time point P _B (for example, the third time point may be after time point P _B ). In particular, it may be configured to start recording between time points P _B and P Recording starts at a certain time point between _C (for example, the third time point can be between time points _PB and _PC ). Since the audio processing circuit 100 has already performed the audio muting at time point P _B , for example, forcibly turning off any possible volume, and in particular, 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 completed. As shown in FIG. 3 , since the audio processing circuit 100 can pre-set the gain in step S12 , in particular, the analog gain AGain and/or the digital gain DGain are maintained at the minimum value at time point P _B .

As another example, the initialization described in step S11 may include a first-stage initialization such as hardware initialization, and in particular, may also include a subsequent second-stage initialization such as system software initialization. The first time point may represent the time before time point P _A. a certain point in time, and the second point in time may represent the point in time P _A . In this case, the audio processing circuit 100 may be configured to start recording after time point P _A (for example, the third time point may be after time point P _A ). In particular, it may be configured to start recording between time points P _A and P Recording starts at a certain time point between _C (for example, the third time point can be between time points P _A and P _C ). Since the audio processing circuit 100 has lowered the analog gain AGain and/or the digital gain DGain at the time point P _A and the audio processing circuit 100 has already performed the audio muting at the time point P _B , the audio processing circuit 100 can operate without generating popping sound. start recording early.

In order to facilitate understanding, the four curves shown in Figure 3 can be drawn to respectively indicate the respective trends of the energy wave generated by the system, the result of the energy wave being suppressed by the system, the upper limit of the volume of the audio sample, and the volume of the audio sample. , but the present invention is not limited to this. According to some embodiments, these four curves may be varied. For example, by performing the progressive volume increase, the audio processing circuit 100 can avoid recording sudden sounds when recording normally after the audio is muted, thereby providing a better user experience. No matter which time point the third time point is between time points P _B and P _C (for example: after time point P _B , the curve indicating the upper limit of the volume of the audio sample changes from zero to non-zero time point), the audio The volume of the sample can gradually increase with the operation of gradually increasing the volume, and the curve indicating the upper limit of the volume of the audio sample can be adjusted accordingly. For example, from Figure 3, the curve indicating the upper limit of the volume of the audio sample encounters The curve indicating the volume of the audio sample starts at the time point and gradually rises to allow the curve indicating the volume of the audio sample to continue to rise. In particular, according to the (PROPORTION> in the equation EQU(1) of the progressive volume increase, >15) to rise in proportion.

As shown in FIG. 3 , time point _PB may be drawn before time point _PC , but the invention is not limited thereto. According to some embodiments, the time point P _B may be moved to the right, or may be moved to the right after the time point _PC .

Figure 4 shows an example of an audio waveform without using this recording method. The horizontal and vertical axes represent time and equivalent volume respectively (marked as "t" and "Vol" respectively for simplicity) . Without this recording method, the energy waves generated by the system are recorded in the recording file. Since the hardware structure of the entire system has not yet reached a steady state, noise such as energy waves generated by the system are recorded in the recorded files, which can cause users to hear short bursts of sound (for example, similar to "Zhi") when listening to the recorded files. There will be a short burst on the waveform on the audio track). If the user is using the sound system for playback, a harsh popping sound will suddenly occur, which can bring an extremely poor user experience.

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

One of the benefits of the present invention is that through a carefully designed control mechanism, the recording method, the audio processing circuit 100, the integrated circuit 12 and the electronic device 10 can properly manage the schedule of relevant settings before and after starting 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 side effects or less likely to cause side effects.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

S11~S15: Steps

Claims (13)

A recording method applied to an electronic device. The electronic device includes an audio processing circuit. The audio processing circuit includes at least one analog-to-digital converter, at least one amplifier and a digital signal processing circuit. The recording method includes: in a first At a time point, initialize the at least one analog-to-digital converter, the at least one amplifier and the digital signal processing circuit in the audio processing circuit; at a second time point, set 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, adjust the gain of the audio processing circuit to a second numerical value; wherein the second numerical value is greater than the first numerical value; wherein the first time point and the second time point are earlier than the third time point, and the fourth time point is later than the third time point, And the fifth time point is later than the third time point. For the recording method described in item 1 of the patent application, the gain is an analog gain. For the recording method described in item 2 of the patent application, the first value of the analog gain is a settable minimum value. For the recording method described in item 1 of the patent application, the gain is a digital gain. For example, the recording method described in item 4 of the patent application scope, wherein the digital gain of the A value is the minimum value that can be set. For the recording method described in item 2 of the patent application, the analog gain represents the gain of the at least one amplifier. For example, in the recording method described in item 4 of the patent application, the digital gain represents the gain of digital audio processing performed by the digital signal processing circuit. For the recording method described in Item 1 of the patent application, 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. For the recording method described in item 1 of the patent application, the gain is increased by a certain amount per unit time. The recording method described in item 1 of the patent application further includes: setting the gain to a predetermined value after a predetermined time after the audio processing circuit completes hardware initialization and the electronic device has not completed software initialization. For the recording method described in item 1 of the patent application, the initialization of the audio processing circuit belongs to a first-stage initialization, and the initialization of the system program 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: setting the gain of digital audio processing performed by the processor running the system code is zero. For the recording method described in claim 11 of the patent application, the second stage initialization further includes using the audio processing circuit to gradually increase the gain of the digital audio processing from zero. An integrated circuit that uses the recording method as described in item 1 of the patent application, wherein the integrated circuit includes the audio processing circuit for being disposed in the electronic device, and the audio processing circuit includes: the at least one An amplifier is 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 is coupled to the at least one amplifier and is used to perform analog-to-digital conversion on the at least one adjusted audio signal. Converting to generate at least one digital audio signal; and a processor coupled to the at least one analog-to-digital converter for controlling the operation of the audio processing circuit and performing operations based on audio samples carried by the at least one digital audio signal Audio processing, wherein the digital signal processing circuit includes the processor.

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