A method for controlling power supply voltage of an audio device and an amplifier thereof

Abstract

The present invention discloses a method for controlling the power supply voltage of an audio device and an amplifier thereof, the method comprising the following steps: S110, the processing unit of the audio device detects the amplitude of the digital audio signal and obtains the sound quality parameters of the audio device; S120, the processing unit calculates the working voltage of the audio power amplifier of the audio device according to the amplitude and the sound quality parameters, and outputs a reference voltage digital sequence corresponding to the working voltage to a first digital-to-analog converter; S130, the first digital-to-analog converter converts the reference voltage digital sequence into a reference voltage and outputs it to a DC-DC circuit of the audio device; S140, the DC-DC circuit outputs a voltage of the same magnitude as the reference voltage as the working voltage of the audio power amplifier. The present invention can determine a suitable working voltage of the audio amplifier on the basis of satisfying the sound quality parameters of the audio device.

Description

Technical Field

[0001] The present invention relates to the field of audio processing, and in particular to an audio device and a method for controlling the power supply voltage of an amplifier thereof. Background Art

[0002] With the development and application of multimedia technology, personal audio devices are widely used, including mobile phones, mobile computers, tablet computers, audio players and other portable audio devices.

[0003] In the prior art, the operating voltage of the audio power amplifier changes with the magnitude of the analog signal voltage input to the audio power amplifier, but the power consumption of the audio power amplifier accounts for a large proportion of the total power consumption of the system in the audio device. The research found that the sound quality parameters of the audio device are usually unchangeable, and in any scenario, as long as the magnitude of the analog signal voltage input to the audio power amplifier is the same, the magnitude of the operating voltage of the audio power amplifier is the same. For example, no matter what the audio content played is (music audio, call audio, or movie audio, etc.), what is the remaining power of the audio device, as long as the magnitude of the analog signal voltage input to the audio power amplifier is the same, the magnitude of the operating voltage of the audio power amplifier is the same, which leads to a large power consumption of the audio power amplifier. Summary of the invention

[0004] Based on the above situation, the main purpose of the present invention is to provide an audio device and a method for controlling the power supply voltage of an amplifier thereof, so as to provide an operating voltage suitable for the sound quality parameters for the audio power amplifier.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A method for controlling the power supply voltage of an audio device amplifier, wherein the audio device is used to process a digital audio signal, and the control method comprises the following steps: S110, a processing unit of the audio device detects the amplitude of the digital audio signal and obtains a sound quality parameter of the audio device; S120, the processing unit calculates the operating voltage of an audio power amplifier of the audio device according to the amplitude and the sound quality parameter, and outputs a reference voltage digital sequence corresponding to the operating voltage to a first digital-to-analog converter; S130, the first digital-to-analog converter converts the reference voltage digital sequence into a reference voltage and outputs it to a DC-DC circuit of the audio device; S140, the DC-DC circuit outputs a voltage having the same magnitude as the reference voltage as the operating voltage of the audio power amplifier.

[0007] Preferably, before step S110, the control method further includes the following steps: the processing unit receives an input sound quality parameter setting operation, and according to the sound quality parameter setting operation, saves the sound quality parameter in a storage unit of the audio device; in step S110, the processing unit obtains the sound quality parameter from the storage unit.

[0008] Preferably, before step S110, the control method further includes the following steps: the processing unit determines the sound quality parameters according to the working information of the audio device, and saves the sound quality parameters in the storage unit of the audio device; in step S110, the processing unit obtains the sound quality parameters from the storage unit.

[0009] Preferably, after step S150, the following steps are also included: the processing unit sets the capacity of the buffer unit of the audio device to a buffer capacity value matching the sound quality parameter according to the matching relationship, so as to set the delay duration of the buffer unit for the digital audio signal; wherein the matching relationship is stored in the storage unit of the audio device, and is used to represent the matching relationship between the sound quality parameter and the buffer capacity value; after the buffer unit delays the digital audio signal for a duration matching the buffer capacity value, the digital audio signal is output to the input end of the second digital-to-analog converter; the second digital-to-analog converter converts the digital audio signal into an analog audio signal and outputs it to the input end of the audio power amplifier; the audio power amplifier amplifies the analog audio signal using the operating voltage.

[0010] Preferably, for the digital audio signals with the same amplitude, the higher the sound quality parameter, the greater the operating voltage.

[0011] The present invention also provides an audio device for processing digital audio signals, comprising a processing unit, an audio power amplifier, a first digital-to-analog converter and a DC-DC circuit, wherein the processing unit is used to: detect the amplitude of the digital audio signal and obtain the sound quality parameters of the audio device; calculate the operating voltage of the audio power amplifier of the audio device according to the amplitude and the sound quality parameters, and output a reference voltage digital sequence corresponding to the operating voltage to the first digital-to-analog converter; the first digital-to-analog converter is used to: convert the reference voltage digital sequence into a reference voltage and output it to the DC-DC circuit of the audio device; the DC-DC circuit is used to: output a voltage of the same magnitude as the reference voltage as the operating voltage of the audio power amplifier; the audio power amplifier is used to operate under the operating voltage.

[0012] Preferably, the processing unit is further used to receive an input sound quality parameter setting operation, and according to the sound quality parameter setting operation, save the sound quality parameters in a storage unit of the audio device, and the processing unit obtains the sound quality parameters from the storage unit.

[0013] Preferably, the processing unit determines the sound quality parameter according to the working information of the audio device, stores the sound quality parameter in a storage unit of the audio device, and obtains the sound quality parameter from the storage unit.

[0014] Preferably, the audio device further includes a buffer unit, a storage unit and a second digital-to-analog converter; the storage unit is used to store a matching relationship, and the matching relationship is used to represent the matching relationship between the sound quality parameter and the buffer capacity value; the processing unit is also used to: set the capacity of the buffer unit of the audio device to a buffer capacity value matching the sound quality parameter according to the matching relationship, so as to set the delay duration of the buffer unit for the digital audio signal; the buffer unit is used to: after delaying the digital audio signal for a duration matching the buffer capacity value, output the digital audio signal to the input end of the second digital-to-analog converter; the second digital-to-analog converter is used to: convert the digital audio signal into an analog audio signal and output it to the input end of the audio power amplifier; the audio power amplifier is specifically used to: amplify the analog audio signal under the operating voltage.

[0015] Preferably, the audio device is a portable audio device.

[0016]

Beneficial Effects

[0017] Through the above scheme, the audio device obtains the sound quality parameters of the audio device, and determines the operating voltage for the audio power amplifier that is compatible with the sound quality parameters based on the amplitude determined by the digital audio signal, thereby determining the appropriate operating voltage of the audio amplifier based on the sound quality parameters of the audio device. In this way, the problem of higher operating voltage and lowest power efficiency caused by the prior art of setting the audio power amplifier to the highest sound quality parameters in all scenarios is avoided.

[0018] In some embodiments, the user can set sound quality parameters. The audio device obtains the sound quality parameters set by the user and determines an operating voltage for the audio power amplifier that is suitable for the sound quality parameters based on the amplitude determined from the digital audio signal. This improves the power conversion efficiency of the audio power amplifier and reduces the power consumption of the audio power amplifier. This can both meet the user's requirements for sound quality parameters and improve the battery life of the audio device.

[0019] In some embodiments, during the use of the audio device, the audio device can automatically determine the sound quality parameters according to different application scenarios of the audio device, and determine an operating voltage for the audio power amplifier that is suitable for the sound quality parameters, thereby improving the power conversion efficiency of the audio power amplifier, which is extremely critical for improving the battery utilization of portable devices.

[0020] Other beneficial effects of the present invention will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The preferred embodiments according to the present invention will be described below with reference to the accompanying drawings.

[0022] Figure 1 An audio device which is a preferred embodiment of the present invention;

[0023] Figure 2 is a flow chart of a method for controlling the power supply voltage of an audio device amplifier of the present invention;

[0024] Figure 3 is a flow chart of another method for controlling the power supply voltage of an audio device amplifier of the present invention;

[0025] Figure 4 It is an audio device according to another preferred embodiment of the present invention. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, an audio device according to an embodiment of the present invention includes a DC-DC circuit 300, a first digital-to-analog converter (i.e., a first DAC) 200, a storage unit 800, a processing unit 110, a buffer unit 120, a second digital-to-analog converter (i.e., a second DAC) 400, an audio power amplifier 500, a power supply 310 (e.g., a battery), and a speaker 700. The audio power amplifier 500 may be a class AB amplifier or a class G amplifier. The audio device is very suitable for power-sensitive audio devices, such as mobile phones, computers, tablets, Bluetooth speakers, audio converters, wearable products, and other battery-powered portable devices.

[0027] The digital audio signal Sn is sent from an upstream electronic device (such as a storage device such as a buffer) to the audio device for processing. After entering the audio device, the digital audio signal Sn is divided into two paths, the first path is input to the processing unit 110, and the second path is input to the buffer unit 120; for the first path of the digital audio signal Sn: the processing unit 110 detects the amplitude of the digital audio signal Sn, and obtains the sound quality parameters of the audio device from the storage unit 800, and then calculates the working voltage of the audio power amplifier 500 of the audio device according to the amplitude and the sound quality parameters, and outputs a reference voltage digital sequence corresponding to the working voltage to the first DAC 200, the first DAC 200 converts the reference voltage digital sequence into a reference voltage and outputs it to the DC-DC circuit 300, after the voltage output by the power supply 310 reaches (i.e., is supplied to) the DC-DC circuit 300, the DC-DC circuit 300 outputs a voltage of the same magnitude as the reference voltage as the working voltage of the audio power amplifier 500; for the second path of the digital audio signal Sn: the digital audio signal is input to the second DAC 400 after an appropriate delay in the buffer unit 120, the second DAC 400 converts the digital audio signal into a corresponding analog audio signal and outputs it to the audio power amplifier 500. The audio power amplifier 500 amplifies the analog audio signal using the above working voltage. Finally, the speaker 700 converts the analog audio signal into a sound signal.

[0028] Figure 2 The present invention is a flow chart of a method for controlling the power supply voltage of an audio device amplifier. The control method includes the following steps.

[0029] S110: The processing unit 110 of the audio device detects the amplitude of the digital audio signal and obtains the sound quality parameter of the audio device.

[0030] S120 , the processing unit 110 calculates the operating voltage of the audio power amplifier 500 of the audio device according to the amplitude and the sound quality parameter, and outputs a reference voltage digital sequence corresponding to the operating voltage to the first digital-to-analog converter 200 .

[0031] S130 , the first digital-to-analog converter 200 converts the reference voltage digital sequence into a reference voltage and outputs the reference voltage to the DC-DC circuit 300 of the audio device.

[0032] S140, the DC-DC circuit 300 outputs a voltage having the same magnitude as the reference voltage as the operating voltage of the audio power amplifier 500.

[0033] Figure 3 is a flow chart of another method for controlling the power supply voltage of an audio device amplifier of the present invention. Figure 3 Provide more detailed explanation.

[0034] S210 , the processing unit 110 of the audio device detects the amplitude of the digital audio signal.

[0035] In this embodiment, in order to calculate the operating voltage of the audio power amplifier 500, it is necessary to determine the size of the analog signal input to the audio power amplifier 500, and the size of the analog signal can be obtained by detecting the amplitude of the digital audio signal. In some embodiments, the amplitude of the digital audio signal can be determined according to the digital audio signal and its amplification factor.

[0036] In some embodiments, the processing unit 110 detects the maximum amplitude value of the digital audio signal within a first analysis duration (e.g., 1s) as the amplitude of the digital audio signal within the first analysis duration, while in other embodiments, the processing unit 110 detects the maximum amplitude value of the digital audio signal within a second analysis duration (greater than the first analysis duration, e.g., 3s) as the amplitude of the digital audio signal within the first analysis duration.

[0037] S220 , the processing unit 110 obtains the sound quality parameters of the audio device from the storage unit 800 .

[0038] The sound quality parameter reflects the quality of the sound played by the audio device. The higher the sound quality parameter, the greater the operating voltage required by the audio power amplifier 500, and the lower the sound quality parameter, the smaller the operating voltage required by the audio power amplifier 500. The greater the operating voltage, the lower the conversion efficiency of the audio power amplifier 500 and the greater the power consumption of the audio power amplifier 500, and the smaller the operating voltage, the greater the conversion efficiency of the audio power amplifier 500 and the lower the power consumption of the audio power amplifier 500.

[0039] The sound quality parameters can be directly set by the user. The processing unit receives the input sound quality parameter setting operation and saves the sound quality parameters set by the sound quality parameter setting operation in the storage unit of the audio device. In some embodiments, the audio device can provide an interface for directly setting the sound quality parameters. After setting, the sound quality parameters are stored in the storage unit 800. For example, the sound quality requirements can be divided into three levels: high sound quality, medium sound quality and low sound quality. In this case, the processing unit 110 can directly obtain the sound quality parameters from the storage unit 800.

[0040] The above-mentioned sound quality parameters can also be determined by the processing unit 110 of the audio device according to the working information of the audio device, and the sound quality parameters are stored in the storage unit 800 of the audio device, wherein the working information can be at least one of the remaining power of the audio device, the audio content played by the audio device (such as call audio, music audio, game audio, movie audio, etc.), and the working state, and the working state includes the audio device being in the awake working state, the dormant (or standby) working state, etc. In some embodiments, the more the remaining power, the higher the sound quality parameter; in some embodiments, different audio contents correspond to different sound quality parameters, for example, the sound quality parameter corresponding to music audio is the highest (high sound quality), the sound quality parameter corresponding to movies or games is the second highest (medium sound quality), and the sound quality parameter corresponding to calls (such as cellular calls or Internet calls) is the lowest (low sound quality); in some embodiments, the sound quality parameter of the awake working state is high, and the sound quality parameter of the dormant (or standby) working state is low. For example, the audio device may provide a sound quality mode setting interface, which is used to select whether to enable the function of changing the power supply voltage of the audio device amplifier according to the sound quality parameters. After the user chooses to enable this function, the processing unit 110 will determine the sound quality parameters according to the working information of the audio device during operation.

[0041] S230 , the processing unit 110 calculates the operating voltage of the audio power amplifier 500 of the audio device according to the amplitude and sound quality parameters of the digital audio signal, and outputs a reference voltage digital sequence corresponding to the operating voltage to the first DAC 200 .

[0042] As mentioned above, different sound quality parameters require different working voltages. In some embodiments, for a digital audio signal of a certain amplitude, the processing unit 110 can use the sum of the increments that match the amplitude and the sound quality parameter as the working voltage of the audio power amplifier 500, and then output the reference voltage digital sequence corresponding to the working voltage to the input end of the first DAC 200. In some embodiments, a corresponding relationship between different sound quality parameters and increments can be set (for example, the larger the sound quality parameter, the larger the corresponding increment), and the corresponding relationship is stored in the storage unit 800. The processing unit 110 can obtain the corresponding increment by searching the corresponding relationship according to the current sound quality parameter of the audio device, and then calculate the sum of the amplitude and increment of the digital audio signal as the working voltage of the audio power amplifier 500, expressed as: y=x+y1, where x represents the amplitude of the digital audio signal, y1 represents the increment, and y represents the working voltage of the audio power amplifier 500. It can be understood that the increment can be a negative number. In this case, the calculated working voltage is less than the amplitude of the digital audio signal, and the corresponding analog audio signal will be distorted when it is amplified by the audio power amplifier 500. This situation is suitable for the case where the sound quality parameter is low (or the power consumption requirement is low).

[0043] S240 , the first DAC 200 converts the reference voltage digital sequence into a reference voltage and outputs the reference voltage to the DC-DC circuit 300 of the audio device as a reference voltage at a reference voltage terminal of the DC-DC circuit 300 .

[0044] S250 , the DC-DC circuit 300 outputs a voltage having the same magnitude as the reference voltage as the operating voltage of the audio power amplifier 500 .

[0045] Under the power supply of the power supply 310, the DC-DC circuit 300 modulates the voltage supplied by the power supply 310 according to the voltage of the reference voltage terminal to output a voltage having the same magnitude as the voltage of the reference voltage terminal, and uses the voltage as the working voltage of the audio power amplifier 500. The power supply 310 voltage is input to the input terminal of the DC-DC circuit 300, and the DC-DC circuit 300 modulates the power supply 310 voltage to a voltage having the same magnitude as the reference voltage according to the reference voltage and outputs it at the output terminal of the DC-DC circuit 300, and the output voltage is used as the working voltage of the audio power amplifier 500. For example, the output terminal of the DC-DC circuit 300 is connected to the positive power supply terminal of the audio power amplifier 500 to provide a positive working voltage to the audio power amplifier 500. In some other embodiments, the audio device also needs a negative working voltage. In this case, a mirror negative voltage conversion circuit 600 may be further included. The output terminal of the DC-DC circuit 300 provides a positive working voltage 600 to the mirror negative voltage conversion circuit, and the mirror negative voltage conversion circuit 600 converts the positive working voltage into a negative working voltage having the same value, thereby achieving the purpose of providing a negative working voltage to the audio power amplifier 500. The mirror negative voltage conversion circuit 600 may adopt a solution in the prior art.

[0046] S260, the digital audio signal is input to the second DAC400 after an appropriate delay through the buffer unit 120, and the second DAC400 converts the digital audio signal into an analog audio signal of the same size and outputs it to the audio power amplifier 500, and the audio power amplifier 500 amplifies the analog audio signal using the working voltage obtained in step S250, and the amplified analog audio signal enters the speaker 700, and the speaker 700 converts the analog audio signal into a sound signal.

[0047] In some embodiments, under different sound quality parameters, the time consumed by the processing unit 110 to calculate the operating voltage and obtain the corresponding reference voltage digital sequence is the same or substantially the same (that is, the time is fixed or substantially fixed). Therefore, it is only necessary to set the capacity of the buffer unit 120 to a buffer capacity value that matches the time. When operating, the buffer unit 120 has the same or substantially the same delay for the digital audio signal.

[0048] In other embodiments, under different sound quality parameters, the time consumed by the processing unit 110 to obtain the reference voltage digital sequence corresponding to the working voltage is different, so it is necessary to determine the corresponding delay time according to the current sound quality parameters of the audio device, that is, the buffer capacity of the buffer unit 120. In this embodiment, the storage unit 800 stores a matching relationship, and the matching relationship is used to represent the matching relationship between the sound quality parameter and the buffer capacity value; the processing unit 110 sets the capacity of the buffer unit 120 of the audio device to the buffer capacity value matching the sound quality parameter according to the matching relationship, so as to set the delay time of the buffer unit 120 for the digital audio signal; after the buffer unit 120 delays the digital audio signal for a time period matching the buffer capacity value, the digital audio signal is output to the second DAC 400; the second DAC 400 converts the digital audio signal into an analog audio signal and outputs it to the audio power amplifier 500; the audio power amplifier 500 amplifies the analog audio signal using the working voltage.

[0049] Through the above scheme, the user can set the sound quality parameters, and the audio device obtains the sound quality parameters and determines the operating voltage for the audio power amplifier 500 that is compatible with the sound quality parameters based on the amplitude determined according to the digital audio signal, thereby determining the appropriate operating voltage of the audio amplifier based on meeting the user's demand for sound quality. In some embodiments, during the use of the audio device, the audio device can automatically select the power configuration (i.e., operating voltage) of the audio power amplifier 500 according to different application scenarios of the audio device, thereby improving the power conversion efficiency of the audio power amplifier 500, which is extremely critical for improving the battery utilization of the portable device. In this way, the problem of higher operating voltage and lowest power efficiency caused by the prior art setting the audio power amplifier 500 to the highest performance in all scenarios is avoided.

[0050] It is understandable that the storage unit 800, the buffer unit 120 and the processing unit 110 can be integrated into one chip (eg, a DSP chip), or any two of the three can be integrated into one chip, such as Figure 4 As shown, the processing unit 110 and the buffer unit 120 are integrated into a digital signal processor (DSP), and the storage unit 800, the buffer unit 120 and the processing unit 110 can also be independent chips.

[0051] In the present invention, the digital audio signal may be of the type of I2S, PCM, SPDIF, etc., and the digital audio signal may be decoded by the digital audio decoder 130, such as Figure 4 shown.

[0052] It should be noted that the use of step numbers to refer to certain specific method steps in the present invention is only for the purpose of convenience and brevity of description, and is by no means intended to limit the order of these method steps by letters or numbers. Those skilled in the art will understand that the order of the relevant method steps should be determined by the technology itself and should not be inappropriately limited by the existence of step numbers.

[0053] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0054] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the power supply voltage of an audio device amplifier, wherein the audio device is used to process digital audio signals, characterized in that: The control method comprises the following steps: S110, the processing unit of the audio device detects the amplitude of the digital audio signal and obtains the sound quality parameter of the audio device; S120, the processing unit calculates the operating voltage of the audio power amplifier of the audio device according to the amplitude and the sound quality parameter, and outputs a reference voltage digital sequence corresponding to the operating voltage to a first digital-to-analog converter; S130, the first digital-to-analog converter converts the reference voltage digital sequence into a reference voltage and outputs the reference voltage to a DC-DC circuit of the audio device; S140, the DC-DC circuit outputs a voltage having the same magnitude as the reference voltage as the operating voltage of the audio power amplifier, The processing unit sets the capacity of the buffer unit of the audio device to a buffer capacity value matching the sound quality parameter according to the matching relationship, so as to set the delay time of the buffer unit for the digital audio signal; wherein the matching relationship is stored in the storage unit of the audio device, and is used to represent the matching relationship between the sound quality parameter and the buffer capacity value; after the buffer unit delays the digital audio signal for a time length matching the buffer capacity value, the buffer unit outputs the digital audio signal to the second digital-to-analog converter; The second digital-to-analog converter converts the digital audio signal into an analog audio signal and outputs the analog audio signal to the audio power amplifier; the audio power amplifier amplifies the analog audio signal using the operating voltage.

2. The control method according to claim 1, characterized in that: Before step S110, the control method further includes the following steps: The processing unit receives an input sound quality parameter setting operation, and stores the sound quality parameter set by the sound quality parameter setting operation in a storage unit of the audio device; In step S110, the processing unit obtains the sound quality parameter from the storage unit.

3. The control method according to claim 1, characterized in that: Before step S110, the control method further includes the following steps: The processing unit determines the sound quality parameter according to the working information of the audio device, and stores the sound quality parameter in the storage unit of the audio device; In step S110, the processing unit obtains the sound quality parameter from the storage unit.

4. The control method according to claim 1, characterized in that: For the digital audio signals with the same amplitude, the higher the sound quality parameter, the greater the working voltage.

5. An audio device for processing a digital audio signal, comprising a processing unit, an audio power amplifier, a first digital-to-analog converter and a DC-DC circuit, characterized in that: Also includes a buffer unit, a storage unit and a second digital-to-analog converter; The processing unit is used to: detect the amplitude of the digital audio signal and obtain the sound quality parameters of the audio device; calculate the operating voltage of the audio power amplifier of the audio device according to the amplitude and the sound quality parameters, and output a reference voltage digital sequence corresponding to the operating voltage to the first digital-to-analog converter; The first digital-to-analog converter is used to: convert the reference voltage digital sequence into a reference voltage and output it to a DC-DC circuit of the audio device; The DC-DC circuit is used to: output a voltage having the same magnitude as the reference voltage as the operating voltage of the audio power amplifier; The storage unit is used to store a matching relationship, where the matching relationship is used to represent a matching relationship between a sound quality parameter and a buffer capacity value; The processing unit is further used to: set the capacity of the buffer unit of the audio device to a buffer capacity value matching the sound quality parameter according to the matching relationship, so as to set the delay time of the buffer unit for the digital audio signal; The buffer unit is used to: after delaying the digital audio signal for a time length matching the buffer capacity value, output the digital audio signal to the second digital-to-analog converter; The second digital-to-analog converter is used to: convert the digital audio signal into an analog audio signal and output the analog audio signal to the audio power amplifier; The audio power amplifier is specifically used to amplify the analog audio signal under the operating voltage.

6. The audio device according to claim 5, characterized in that The processing unit is further used to receive an input sound quality parameter setting operation, and according to the sound quality parameter setting operation, save the sound quality parameter in the storage unit of the audio device, and the processing unit obtains the sound quality parameter from the storage unit.

7. The audio device according to claim 5, characterized in that The processing unit determines the sound quality parameter according to the working information of the audio device, stores the sound quality parameter in a storage unit of the audio device, and obtains the sound quality parameter from the storage unit.

8. The audio device according to claim 5, characterized in that The audio device is a portable audio device.

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