CN114579077B - Volume control equipment - Google Patents
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- CN114579077B CN114579077B CN202210168337.8A CN202210168337A CN114579077B CN 114579077 B CN114579077 B CN 114579077B CN 202210168337 A CN202210168337 A CN 202210168337A CN 114579077 B CN114579077 B CN 114579077B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/165—Management of the audio stream, e.g. setting of volume, audio stream path
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Abstract
The application discloses volume control equipment, which comprises a static storage area, a dynamic storage area and an MCU. The static storage area and the dynamic storage area are respectively used for storing a plurality of target volume control parameters and default volume control parameters for controlling the volume of the audio playing device, and the target volume control parameters correspond to the application scene. The MCU is configured to: acquiring default volume control parameters; acquiring a target volume control parameter matched with a current application scene; determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter; and if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter. In the application, the playing of different audio files corresponds to different volume control parameters, and when the audio files are played, the playing of the different audio files at different playing volumes can be realized without manually adjusting the volume, so that the audio file playing device is convenient to use.
Description
Technical Field
The application relates to the technical field of communication, in particular to volume control equipment.
Background
All audio files output by the existing volume control equipment are played according to the same volume. When playing certain content, the user may be required to manually adjust the volume, which is inconvenient to use.
Disclosure of Invention
The application provides a volume control device which can realize volume adjustment without manual adjustment.
A volume control device, comprising:
the static storage area is used for storing a plurality of target volume control parameters for controlling the volume of the audio playing equipment, and the target volume control parameters correspond to the application scene;
a dynamic storage area for storing default volume control parameters for controlling the volume of the audio playback device;
MCU, respectively with static storage area, dynamic storage area communication connection, configured as:
acquiring default volume control parameters;
acquiring a target volume control parameter matched with a current application scene;
determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter;
And if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter.
The beneficial effects are that: the application provides volume control equipment which comprises a static storage area, a dynamic storage area and an MCU. And the static storage area is used for storing a plurality of target volume control parameters for controlling the volume of the audio playing equipment, and the target volume control parameters correspond to the application scene. And the dynamic storage area is used for storing default volume control parameters for controlling the volume of the audio playing device. MCU, respectively with static storage area, dynamic storage area communication connection, configured as: acquiring default volume control parameters; acquiring a target volume control parameter matched with a current application scene; determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter; and if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter. In the application, the MCU determines whether volume adjustment is needed or not by comparing the default volume control parameter with the target volume control parameter matched with the current application scene corresponding to the default volume control parameter; and generating a volume adjustment instruction if volume adjustment is required. In the application, the playing of different audio files corresponds to different volume control parameters, and when the audio files are played, the playing of the different audio files at different playing volumes can be realized without manually adjusting the volume, so that the audio file playing device is convenient to use.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a usage scenario of a set-top box and a bluetooth remote control according to an embodiment;
fig. 2 is a schematic structural diagram of a volume control device according to an embodiment of the present application;
fig. 3 is a schematic diagram of a mechanism of a set top box according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a bluetooth remote controller according to an embodiment of the present application;
fig. 5 is a flowchart of a first volume control method according to an embodiment of the present application;
fig. 6 is a flowchart of a second volume control method according to an embodiment of the present application;
fig. 7 is a flowchart of a third volume control method according to an embodiment of the present application.
Detailed Description
In order to facilitate explanation of the technical solutions of the application, some concepts related to the present application will be explained first.
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the brief description of the terminology in the present application is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.
The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.
The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or/and software code that is capable of performing the function associated with that element.
Fig. 1 is a schematic diagram of a usage scenario of a set-top box according to an embodiment. As shown in fig. 1, the set-top box 100 is a device that connects the display device 200 with the server 400. It can convert the compressed digital signal into television content and display it on a display device.
The display device 200 is in data communication with the server 400, and a user can operate the display device 200 through the smart device 300 or the control apparatus 500.
In some embodiments, the control apparatus 500 may be a bluetooth remote control, and the communication between the bluetooth remote control and the display device includes at least one of infrared protocol communication or bluetooth protocol communication, and other short-range communication modes, and the display device 200 is controlled by a wireless or wired mode. The user may input a user instruction through at least one of a key on a bluetooth remote controller, a voice input, a control panel input, etc., to control the display device 200.
In some embodiments, the smart device 300 may include any one of a mobile terminal, tablet, computer, notebook, AR/VR device, etc.
In some embodiments, the smart device 300 may also be used to control the display device 200. For example, the display device 200 is controlled using an application running on a smart device.
In some embodiments, the smart device 300 and the display device may also be used for communication of data.
In some embodiments, the display device 200 may also perform control in a manner other than the control apparatus 500 and the smart device 300, for example, the voice command control of the user may be directly received through a module configured inside the display device 200 device for acquiring voice commands, or the voice command control of the user may be received through a voice control apparatus configured outside the display device 200 device.
In some embodiments, the set top box is also in data communication with the server 400. The set top box 100 may be permitted to make communication connections via a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various content and interactions to the set top box 100. The server 400 may be a cluster, or may be multiple clusters, and may include one or more types of servers.
In some embodiments, software steps performed by one step execution body may migrate on demand to be performed on another step execution body in data communication therewith. For example, software steps executed by the server may migrate to be executed on demand on a display device in data communication therewith, and vice versa.
The control device 500 may also be connected to the set top box 100 in a communication manner, where the control device and the set top box communicate via an infrared protocol, and the set top box receives a communication signal from the control device, so as to complete remote control operation of a user.
Fig. 2 is a schematic structural diagram of a volume control device according to an embodiment of the present application. Fig. 3 is a schematic diagram of a set top box according to an embodiment of the present application. Fig. 4 is a schematic structural diagram of a bluetooth remote controller according to an embodiment of the present application. As can be seen from fig. 2-4, the volume control device comprises a static memory area, a dynamic memory area and an MCU. In particular, the method comprises the steps of,
And the static storage area is used for storing a plurality of target volume control parameters for controlling the volume of the audio playing device. The target volume control parameter corresponds to the application scene.
And the dynamic storage area is used for storing default volume control parameters for controlling the volume of the audio playing device.
MCU, respectively with static storage area, dynamic storage area communication connection, configured as: acquiring default volume control parameters; acquiring a target volume control parameter matched with a current application scene; determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter; and if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the volume adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter. The current application scene corresponds to the default volume control parameter.
The static storage area and the dynamic storage area can be placed outside the MCU and also can be placed inside the MCU. When both the static memory area and the dynamic memory area are placed inside the MCU, the MCU is also configured to: acquiring default volume control parameters; acquiring a target volume control parameter matched with a current application scene; determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter; and if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the volume adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter. The current application scene corresponds to the default volume control parameter.
In the embodiment of the application, the MCU determines whether volume adjustment is needed or not by comparing the default volume control parameter with the target volume control parameter matched with the current application scene corresponding to the default volume control parameter; and generating a volume adjustment instruction if volume adjustment is required. The method ensures that the playing of different audio files corresponds to different volume control parameters, and when the audio files are played, the volume does not need to be manually adjusted, so that the different audio files can be played at different playing volumes, and the method is convenient to use.
The volume control device may be either a set top box or a bluetooth remote control.
When the volume control device is a set-top box, the MCU within the set-top box may also be configured to adjust the default volume control parameter to a target volume control parameter according to the volume adjustment instruction.
When the volume control device is a bluetooth remote controller, the MCU in the bluetooth remote controller may be further configured to send a volume adjustment instruction to another volume control device, where the volume adjustment instruction includes a target volume control parameter, and the other volume control device is a set-top box.
When the volume control device is a set top box, a decoder, a digital-to-analog converter and an operational amplifier circuit are also arranged in the set top box. In particular, the method comprises the steps of,
And the decoder is positioned in the MCU, connected with the dynamic storage area and used for decoding the audio file to obtain the decoded audio file. The decoded audio file is digital audio.
The set top box includes a digital interface and an analog interface. The digital interface is connected with the intelligent equipment and outputs digital audio. And the analog interface is connected with the audio playing equipment and outputs analog audio.
The intelligent device can be a television, a mobile phone or the like. Because the intelligent device is internally provided with the digital-analog converter, the operational amplifier circuit and the audio playing device. The playing process after the digital audio enters the intelligent device is as follows: the digital audio is converted into analog audio under the action of a digital-to-analog converter, the analog audio is amplified by an operational amplifier circuit, and the amplified analog audio is played by audio playing equipment.
And analog audio is directly played through the audio playing device.
Since the decoded audio file is digital audio. In order for a set top box to output analog audio through an analog interface, a digital-to-analog converter needs to be provided in the set top box.
And the digital-to-analog converter is connected with the decoder and the dynamic storage area and is used for converting digital audio into analog audio. The digital-to-analog converter converts the decoded audio file from digital audio to analog audio and stores the analog audio in the dynamic storage area.
When the audio file to be output by the set top box is digital audio, the decoded audio file is directly stored in the dynamic storage area; when the audio file to be output by the set top box is analog audio, the decoded audio file is converted from digital audio to analog audio through a digital-to-analog converter, and then the analog audio file is stored in a dynamic storage area.
And the operational amplifier circuit is connected with the MCU and comprises a second enabling pin for amplifying analog audio. And the second enabling pin is connected with the first enabling pin in the MCU.
After the MCU acquires the default volume control parameters, the first enabling pin and the second enabling pin corresponding to the default volume control parameters are controlled to be conducted according to the default volume control parameters. In order to control the first enable pin and the second enable pin corresponding to the target volume control parameter to be turned on, the MCU may be further configured to: and controlling the first enabling pin to be disconnected from the second enabling pin corresponding to the default volume control parameter according to the volume adjustment instruction, and controlling the first enabling pin to be connected with the second enabling pin corresponding to the target volume control parameter.
After the first enabling pin and the second enabling pin corresponding to the target volume control parameter are conducted, analog audio is amplified by the operational amplifier circuit and then transmitted to the analog interface.
The operational amplifier circuit comprises a first-stage operational amplifier sub-circuit and a second-stage operational amplifier sub-circuit. The first-stage operational amplifier sub-circuit and the second-stage operational amplifier sub-circuit are conducted through the second enabling pin and the third enabling pin. The third enabling pin is an enabling pin of the second-stage operational amplifier sub-circuit.
The operational amplifier circuit further comprises a third-stage operational amplifier sub-circuit and a fourth-stage operational amplifier sub-circuit. The second-stage operational amplifier sub-circuit and the third-stage operational amplifier sub-circuit are communicated with the fourth enabling pin through the third enabling pin, and the third operational amplifier sub-circuit and the fourth operational amplifier sub-circuit are communicated with the fifth enabling pin through the fourth enabling pin. The fourth enabling pin is an enabling pin of the third-stage operational amplifier sub-circuit, and the fifth enabling pin is an enabling pin of the fourth-stage operational amplifier sub-circuit.
And by analogy, the operational amplifier circuit further comprises an N-th operational amplifier sub-circuit, and the N-1-th operational amplifier sub-circuit and the N-th operational amplifier sub-circuit are conducted with the (n+1) -th enabling pin through the N-th enabling pin.
The application scene may be derived from user information, a program type of the audio file, a program time period of the audio file, and a program content of the audio file. And obtaining the age groups of the program watching crowd according to the user information. And obtaining a program playing time point according to the program time period of the audio file. There are many application scenarios within a static memory area. The application scene comprises the program type, the age group of the program watching crowd, the program playing time point and the program content.
For example: the first application scene is a program type 1, an age group 1 of a program watching crowd, a program playing time point 1 and a program content 1, the second application scene is a program type 1, an age group 1 of a program watching crowd, a program playing time point 2 and a program content 1, the third application scene is a program type 2, an age group 1 of a program watching crowd, a program playing time point 1 and a program content 1, the fourth application scene is a program type 2, an age group 1 of a program watching crowd, a program playing time point 1 and a program content 2, and so on.
Since the type of audio file may be analog audio or digital audio, the target volume control parameter and the default volume control parameter each include a DAC value or an amplification resistance ratio.
When the type of audio file is digital audio, the target volume control parameter and the default volume control parameter are DAC values. When the type of the audio file is analog audio, both the target volume control parameter and the default volume control parameter are amplification resistance ratios.
When the volume control device is a Bluetooth remote controller, the Bluetooth remote controller further comprises a transceiver chip. In particular, the method comprises the steps of,
The receiving and transmitting chip is connected with the MCU, and is not only used for receiving default volume control parameters transmitted by the set top box, but also used for receiving new volume adjustment instructions sent by a user according to own requirements and sending the volume adjustment instructions to the set top box. The volume adjustment instruction not only comprises a new volume adjustment instruction sent by a user according to the self demand, but also comprises a volume adjustment instruction obtained by the Bluetooth remote controller according to the comparison of the default volume control parameter and the target volume control parameter matched with the current application scene corresponding to the default volume control parameter.
The application provides volume control equipment which comprises a static storage area, a dynamic storage area and an MCU. And the static storage area is used for storing a plurality of target volume control parameters for controlling the volume of the audio playing equipment, and the target volume control parameters correspond to the application scene. And the dynamic storage area is used for storing default volume control parameters for controlling the volume of the audio playing device. MCU, respectively with static storage area, dynamic storage area communication connection, configured as: acquiring default volume control parameters; acquiring a target volume control parameter matched with a current application scene; determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter; and if the volume is required to be adjusted, generating a volume adjustment instruction, wherein the adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter. In the application, the MCU determines whether volume adjustment is needed or not by comparing the default volume control parameter with the target volume control parameter matched with the current application scene corresponding to the default volume control parameter; and generating a volume adjustment instruction if volume adjustment is required. In the application, the playing of different audio files corresponds to different volume control parameters, and when the audio files are played, the playing of the different audio files at different playing volumes can be realized without manually adjusting the volume, so that the audio file playing device is convenient to use.
Fig. 5 is a flowchart of a first volume control method according to an embodiment of the present application. Fig. 6 is a flowchart of a second volume control method according to an embodiment of the present application. Fig. 7 is a flowchart of a third volume control method according to an embodiment of the present application. As can be seen from fig. 5-7, the present application provides a corresponding volume control method in addition to the volume control device described above.
The decoded audio file needs to be acquired before the volume control device controls the volume adjustment. The process of obtaining the decoded audio file is: firstly, the set top box downloads an audio file in a server; secondly, decoding the audio file by a decoder of the set top box to obtain a decoded audio file; finally, the decoded audio file is stored in the dynamic storage area.
Since the volume control device can be a set top box or a bluetooth remote controller, and the audio file can be analog audio or digital audio, the volume control method comprises the following cases:
when the volume control device is a set top box and the audio file is digital audio, the volume control method:
s100: and acquiring default volume control parameters.
Default volume control parameters are stored in the dynamic memory area.
S200: and acquiring a target volume control parameter matched with the current application scene.
The current application scene corresponds to the default volume control parameter. The target volume control parameter may be stored in a static memory area or a register in the MCU.
S300: and determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter.
And when the absolute difference between the default volume control parameter and the target volume control parameter is smaller than or equal to the preset amplitude, determining that volume adjustment is not needed.
And when the absolute difference between the default volume control parameter and the target volume control parameter is larger than the preset amplitude, determining that volume adjustment is needed.
S400: if not, no adjustment is necessary.
And if no adjustment is needed, the set top box directly transmits the digital audio to the intelligent device through the digital interface.
S500: if so, a volume adjustment instruction is generated.
The volume adjustment instruction is used for instructing the audio playing device to adjust the playing volume according to the target volume control parameter.
S600: and adjusting the default volume control parameter to be a target volume control parameter according to the volume adjustment instruction.
And storing the target volume control parameter in a storage area where the default volume control parameter is located according to the volume adjustment instruction. Or adjusting the default volume control parameter to the target volume control parameter by adjusting the amplitude according to the volume adjustment instruction.
When the volume control device is a set top box and the audio file is analog audio, the volume control method:
T100: and acquiring default volume control parameters.
After the MCU obtains the default volume control parameters, the first enabling pin and the second enabling pin corresponding to the default volume control parameters are controlled to be conducted according to the default volume control parameters.
T200: and acquiring a target volume control parameter matched with the current application scene.
T300: and determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter.
T400: if not, no adjustment is necessary.
T500: if so, a volume adjustment instruction is generated.
T600: and controlling the first enabling pin to be disconnected from the second enabling pin corresponding to the default volume control parameter according to the volume adjustment instruction, and controlling the first enabling pin to be connected with the second enabling pin corresponding to the target volume control parameter.
And storing the target volume control parameter in a storage area where the default volume control parameter is located according to the volume adjustment instruction, or adjusting the default volume control parameter to the target volume control parameter by adjusting the amplitude according to the volume adjustment instruction, then controlling the first enabling pin to be disconnected from the second enabling pin corresponding to the default volume control parameter, and finally controlling the first enabling pin to be connected with the second enabling pin corresponding to the target volume control parameter.
When the volume control device is a set-top box, each step of the volume control method is performed by the MCU of the set-top box.
When the volume control device is a Bluetooth remote controller and the audio file is digital audio, the volume control method comprises the following steps:
t100: and acquiring default volume control parameters.
Because the default volume control parameters can be stored in the dynamic storage area in the set top box or in the dynamic storage area in the Bluetooth remote controller, the Bluetooth remote controller can directly acquire the default volume control parameters from the dynamic storage area of the Bluetooth remote controller or acquire the default volume control parameters in the dynamic storage area in the set top box through Bluetooth communication.
T200: and acquiring a target volume control parameter matched with the current application scene.
The target volume control parameters can be stored in the static storage area in the set top box and the register of the MCU, and can also be stored in the static storage area in the Bluetooth remote controller and the register of the MCU, so that the Bluetooth remote controller can directly acquire the target volume control parameters from the static storage area of the Bluetooth remote controller or the register of the MCU, and can also acquire the target volume control parameters in the static storage area in the set top box or the register of the MCU through Bluetooth communication.
T300: and determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter.
T400: if not, no adjustment is necessary.
T500: if so, a volume adjustment instruction is generated.
T600: and sending a volume adjustment instruction to the set top box, wherein the volume adjustment instruction comprises a target volume control parameter.
When the volume control device is a bluetooth remote controller, each step of the volume control method is performed by the MCU of the bluetooth remote controller.
And the set top box adjusts the default volume control parameter to be the target volume control parameter according to the received target volume control parameter.
The method for adjusting the default volume control parameter to the target volume control parameter by the set top box further comprises two steps, wherein one step is to adjust the default volume control parameter to the target volume control parameter according to the volume adjustment instruction; and the other is to control the first enabling pin and the second enabling pin corresponding to the default volume control parameter to be disconnected according to the volume adjustment instruction, and control the first enabling pin and the second enabling pin corresponding to the target volume control parameter to be connected.
When the adjusted result cannot obtain the requirement of the customer, the customer can send out a new volume adjusting instruction through voice. And the Bluetooth remote controller sends the received new volume adjustment instruction to the set top box through Bluetooth, and the set top box further adjusts the playing volume of the audio playing device according to the new volume adjustment instruction. And updating the target volume control parameter in the set top box to the static storage area according to the new volume adjustment instruction.
Since the foregoing embodiments are all described in other modes by reference to the above, the same parts are provided between different embodiments, and the same and similar parts are provided between the embodiments in the present specification. And will not be described in detail herein.
It should be noted that in this specification, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the statement "comprises one … …" does not exclude that an additional identical element is present in a circuit structure, article or device comprising the element.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the application. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The embodiments of the present application described above do not limit the scope of the present application.
Claims (5)
1. A volume control device, comprising:
The static storage area is used for storing a plurality of target volume control parameters for controlling the volume of the audio playing equipment, and the target volume control parameters correspond to the application scene;
a dynamic storage area for storing default volume control parameters for controlling the volume of the audio playback device;
the digital-to-analog converter is connected with the dynamic storage area and is used for converting digital audio into analog audio;
MCU, connect with said static storage area, said dynamic storage area and said D/A converter separately, including the first enabling pin;
The operational amplifier circuit comprises a second enabling pin; the first enabling pin is connected with the second enabling pin;
the MCU is configured to:
acquiring the default volume control parameter;
acquiring a target volume control parameter matched with a current application scene;
Determining whether volume adjustment is needed according to the default volume control parameter and the target volume control parameter;
Generating a volume adjustment instruction if volume adjustment is required;
if digital audio needs to be output, adjusting the default volume control parameter to the target volume control parameter according to the volume adjustment instruction;
If analog audio needs to be output, the first enabling pin and the second enabling pin corresponding to the default volume control parameter are controlled to be disconnected according to the volume adjustment instruction, and the first enabling pin and the second enabling pin corresponding to the target volume control parameter are controlled to be connected.
2. The volume control device of claim 1 wherein the application scene is derivable from a program type of the audio file, a program time period of the audio file, and a program content of the audio file.
3. The volume control device of claim 1, wherein the target volume control parameter and the default volume control parameter each comprise a DAC value or an amplification resistance ratio.
4. The volume control device of claim 1, wherein the operational amplifier circuit comprises a first stage operational amplifier sub-circuit and a second stage operational amplifier sub-circuit;
The first-stage operational amplifier sub-circuit and the second-stage operational amplifier sub-circuit are conducted with a third enabling pin through the second enabling pin, wherein the third enabling pin is an enabling pin of the second-stage operational amplifier sub-circuit.
5. The volume control device of claim 1, further comprising a decoder;
The decoder is positioned in the MCU and used for decoding the audio file.
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