Audio tuning device

Abstract

The utility model relates to the technical field of tuning, and provides audio tuning equipment, which comprises an audio input module, a tuning module, a signal selecting and matching module and an audio output module. The audio input module comprises at least two kinds of audio signal interfaces, and the audio input module receives audio information through the audio signal interfaces and converts the audio information into a first signal. The tuning module is configured to be connected with the audio input module and the external device, the tuning module obtains tuning parameters from the external device, and the tuning module is used for modulating the first signal into a second signal according to the tuning parameters. The signal selecting and matching module is connected with the tuning module, and the signal selecting and matching module is used for controlling the tuning module to selectively read the first signal output by one of the at least two audio signal interfaces. The audio tuning equipment can be connected with various different sound sources, the connected sound sources can be switched according to tuning requirements, and audio information input by one sound source can be read and modulated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tone adjustment, especially relates to an audio tone adjustment equipment. BACKGROUND

[0002] The existing vehicle-mounted sound system usually has multiple audio input modes, such as external storage device input (such as USB memory), optical fiber signal input, A2B (Automotive Audio Bus, vehicle-mounted audio bus) input, etc. In related technologies, the vehicle-mounted tone adjustment equipment is usually only provided with a single type of input interface, which is inconvenient to use when performing vehicle-mounted tone adjustment on the vehicle-mounted system, and has poor applicability. SUMMARY

[0003] The utility model provides a kind of audio tone adjustment equipment, to solve the defect that the vehicle-mounted tone adjustment equipment in prior art is usually only provided with a single type of input interface, which is inconvenient to use when performing vehicle-mounted tone adjustment on the vehicle-mounted system, and has poor applicability.

[0004] The utility model provides a kind of audio tone adjustment equipment, comprising:

[0005] An audio input module includes at least two audio signal interfaces. The audio input module receives audio information through the audio signal interfaces and converts the audio information into a first signal.

[0006] A tone adjustment module is configured to be connected to the audio input module and an external device respectively. The tone adjustment module obtains tone adjustment parameters from the external device. The tone adjustment module modulates the first signal into a second signal according to the tone adjustment parameters.

[0007] A signal selection module is connected to the tone adjustment module. The signal selection module controls the tone adjustment module to selectively read the first signal output by one of the at least two audio signal interfaces.

[0008] An audio output module is connected to the tone adjustment module. The audio output module converts the second signal into an audio output signal.

[0009] According to the audio tone adjustment equipment of the utility model, the tone adjustment module includes a digital signal processor and a processor. The signal selection module includes a first switch key.

[0010] The digital signal processor is connected to the audio input module and modulates the first signal given by the audio input module into the second signal.

[0011] The processor is connected to the signal matching module and the digital signal processor respectively. The first switch key is used to control the digital signal processor to read the first signal output by each of the audio signal interfaces in sequence after being triggered.

[0012] According to the audio tuning device of this utility model, the tuning module further includes a memory; the processor is configured to be connected to the memory and the external device respectively;

[0013] The processor is used to receive the tuning parameters input by the external device, write the tuning parameters into the memory for storage, and the processor is also used to retrieve the tuning parameters stored in the memory and input the tuning parameters into the digital signal processor.

[0014] According to the audio tuning device of this utility model, the memory has multiple storage bits, each storage bit being used to store a set of tuning parameters; the signal selection module further includes tuning buttons that correspond one-to-one with the storage bits;

[0015] Each of the tuning buttons, upon being triggered, controls the processor to retrieve a set of tuning parameters stored in the corresponding storage bit and input them to the digital signal processor.

[0016] According to the audio tuning device of this utility model, the signal selection module further includes indicator lights corresponding to the tuning buttons one by one. When a tuning button is triggered, the corresponding indicator light lights up, and the other indicator lights turn off.

[0017] According to the audio tuning device of this utility model, the digital signal processor is provided with a tuning interface, which is used to connect to the external device to receive tuning parameters input by the external device.

[0018] According to the audio tuning device of this utility model, the tuning module further includes a switching switch, which is disposed between the digital signal processor and the processor;

[0019] The signal selection module also includes a mode switching key, which is used to control the processor to open or close the switching switch.

[0020] According to the audio tuning device of this utility model, the audio signal interface includes at least two of the following: an A2B interface, an SPDIF interface, and an MP3 interface.

[0021] According to the audio tuning device of this utility model, the audio signal interface includes the MP3 interface, which is used to read one or more audio files from an external storage device;

[0022] The signal selection module also includes a second switching key connected to the MP3 interface. The second switching key is used to control the MP3 interface to switch the currently read audio file after being triggered.

[0023] According to the audio tuning device of this utility model, the audio output module includes an audio amplifier, the audio amplifier is provided with multiple audio output interfaces, and all of the multiple audio output interfaces are used to connect to a playback device.

[0024] This invention discloses an audio tuning device. The audio input module has multiple audio signal interfaces, suitable for connecting various audio sources to receive audio information from different sources. Each audio signal interface converts the corresponding audio information into a first signal. The tuning module receives tuning parameters from external devices and, under the control of the signal selection module, selectively reads the first signal from one of the audio signal interfaces. After converting the first signal into a second signal according to the tuning parameters, it transmits it to the audio output module for playback by the playback device. Therefore, this invention's audio tuning device can connect to multiple different audio sources and switch between them according to tuning requirements. It reads audio information from one source, modulates it, and transmits it to the playback device. This effectively solves the problem that existing in-vehicle tuning devices typically only have a single type of input interface, making them inconvenient to use and lacking in applicability when tuning in-vehicle systems. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the hardware framework of the audio tuning device provided in this embodiment of the utility model.

[0027] Figure 2 This is a schematic diagram of the audio tuning device provided in an embodiment of the present invention.

[0028] Figure 3 This is one of the circuit schematic diagrams of the SPDIF interface provided in this embodiment of the utility model.

[0029] Figure 4 This is one of the circuit schematic diagrams of the SPDIF interface provided in this embodiment of the utility model.

[0030] Figure 5This is a circuit diagram of the USB to TTL adapter provided in this embodiment of the utility model.

[0031] Figure 6 This is a circuit diagram showing the connection between the digital signal processor and external devices provided in this embodiment of the utility model via a switching switch.

[0032] Figure 7 This is one of the circuit schematic diagrams of the power module provided in this embodiment of the utility model.

[0033] Figure 8 This is the second circuit schematic diagram of the power module provided in this embodiment of the utility model.

[0034] Figure label:

[0035] 1. Audio mixing equipment;

[0036] 11. Audio input module; 111. A2B interface; 112. SPDIF interface; 113. MP3 interface;

[0037] 12. Tuning module; 121. Digital signal processor; 1211. Tuning interface; 122. Processor; 123. Memory; 124. Switch;

[0038] 13. Signal selection module; 131. First switch key; 132. Tuning key; 133. Indicator light; 134. Mode switch key; 135. Second switch key;

[0039] 14. Audio output module;

[0040] 2. External equipment. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] The following is combined Figures 1-2 This invention describes an audio tuning device.

[0043] like Figure 1As shown, this utility model provides an audio tuning device 1, including: an audio input module 11, a tuning module 12, a signal matching module 13, and an audio output module 14. The audio input module 11 includes at least two audio signal interfaces. The audio input module 11 receives audio information through the audio signal interfaces and converts the audio information into a first signal. The tuning module 12 is configured to connect to both the audio input module 11 and an external device 2. The tuning module 12 obtains tuning parameters from the external device 2 and modulates the first signal into a second signal according to the tuning parameters. The signal matching module 13 is connected to the tuning module 12 and controls the tuning module 12 to selectively read the first signal output from one of the at least two audio signal interfaces. The audio output module 14 is connected to the tuning module 12 and converts the second signal into an audio output signal.

[0044] In this embodiment, the audio input module 11 has at least two audio signal interfaces. Different audio signal interfaces are used to connect to corresponding types of audio sources (such as optical fiber, USB flash drive, etc.) and receive audio information from the audio source. It is understood that the audio information can be an audio signal or an audio file. The audio signal interface can process the corresponding audio information and convert it into a first signal.

[0045] The tuning module 12 can be connected to an external device 2 (such as a computer). During tuning, the operator can input tuning parameters into the tuning module 12 through the external device 2. After reading the first signal output by the audio output module 14, the tuning module 12 modulates the first signal according to the tuning parameters, converting the first signal into a second signal. The audio output module 14 is connected to the tuning module 12 so that it can convert the second signal into an audio output signal and output it to the playback device for playback. By adjusting the tuning parameters of the tuning module 12, the modulation effect of the first signal can be changed, thereby adjusting the audio playback effect of the playback device to meet the playback requirements.

[0046] Meanwhile, by setting up the signal matching module 13, when the audio input module 11 is connected to multiple audio sources, the signal matching module 13 can control the tuning module 12 to read the first signal output by one of the audio signal interfaces according to the actual tuning requirements, so as to modulate the audio information input by the audio source, avoid mutual interference of the first signals output by multiple audio signal interfaces, and can switch the audio signal interface read by the tuning module 12 at any time according to the tuning requirements.

[0047] The audio tuning device 1 of this invention has an audio input module 11 with multiple audio signal interfaces, suitable for connecting various different audio sources to receive audio information input from different types of audio sources. The audio signal interfaces can convert the corresponding audio information into a first signal. The tuning module 12 can receive tuning parameters input from an external device 2, and selectively read the first signal from one of the audio signal interfaces under the control of the signal selection module 13. After converting the first signal into a second signal according to the tuning parameters, it transmits it to the audio output module 14 for playback by a playback device. As can be seen from the above, the audio tuning device 1 of this invention can connect to multiple different audio sources and switch between them according to tuning requirements. It reads the audio information input from one audio source, modulates it, and transmits it to the playback device for playback. This effectively solves the shortcomings of existing in-vehicle tuning devices, which usually only have a single type of input interface, making them inconvenient to use and having poor applicability when tuning in-vehicle systems.

[0048] It is understood that the signal selection module 13 can be a human-machine interaction device, such as a touch screen, for the operator to input control commands and switch the audio signal interface currently read by the tuning module 12 according to the control commands; or, the signal selection module 13 can also be an operation panel with operation buttons.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, the tuning module 12 includes a digital signal processor 121 and a processor 122. The signal selection module 13 includes a first switch key 131. The digital signal processor 121 is connected to the audio input module 11 and is used to modulate a first signal given by the audio input module 11 into a second signal. The processor 122 is connected to both the signal selection module 13 and the digital signal processor 121. The first switch key 131 is used, upon triggering, to control the digital signal processor 121 to sequentially read the first signals output from each audio signal interface via the processor 122.

[0050] In this embodiment, the digital signal processor 121 of the tuning module 12 is used to read the first signal output from the audio signal interface and modulate the first signal according to the audio parameters to modulate the first signal into a second signal. Meanwhile, the signal selection module 13 includes a first switching key 131. The processor 122 is connected to both the signal selection module 13 and the digital signal processor 121. When multiple audio signal interfaces are connected to audio sources, the digital signal processor 121 only reads the first signal output from one of the audio signal interfaces. When it is necessary to switch the audio signal interface read by the digital signal processor 121, the operator can issue a command to the processor 122 by triggering the first switching key 131. After receiving the command, the processor 122 controls the digital signal processor 121 to read the first signal output from another audio signal interface, making operation convenient.

[0051] Understandably, the control program of the digital signal processor 121 sorts each audio signal interface according to a certain sorting rule. The digital signal processor 121 reads the first signal output by one of the audio signal interfaces each time. Whenever the operator triggers the first switching key 131, the processor 122 controls the digital signal processor 121 to read the first signal output by the next audio signal interface. When the digital signal processor 121 is currently reading the last audio signal interface, after the operator triggers the first switching key 131, the digital signal processor 121 switches to reading the audio signal interface corresponding to the first sequence number.

[0052] Specifically, the digital signal processor 121 can use an AK7738AVQ codec chip.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the tuning module 12 also includes a memory 123. The processor 122 is configured to be connected to both the memory 123 and the external device 2. The processor 122 is used to receive tuning parameters input from the external device 2, write the tuning parameters into the memory 123 for storage, and also to retrieve the tuning parameters stored in the memory 123 and input the tuning parameters to the digital signal processor 121.

[0054] In this embodiment, the processor 122 is also used to connect to the external device 2 so that the external device 2 can input tuning parameters to the processor 122, and the processor 122 can write the input tuning parameters into the memory 123 for storage. When tuning is required, the processor 122 can retrieve the tuning parameters and input them to the digital signal processor 121, so that the digital signal processor 121 can modulate the input first signal according to the tuning parameters. The structure is simple and can avoid the loss of tuning parameters.

[0055] Specifically, the processor 122 can be an ARM Cortex-M4F / M0 minimum system, connected to the external device 2 via a USB to TTL adapter, so that tuning parameters can be input via a USB interface.

[0056] Specifically, Figure 5 The circuit diagram of a USB to TTL (Transistor-Transistor-Logic) adapter is shown. In the diagram, the USB connector J12 is used to connect to the external device 2 via a USB cable and transmits the received signal to the converter U8. The converter U8 converts the received signal into a TTL level for transmission to the processor 122.

[0057] In some embodiments, the memory 123 has multiple storage bits, each used to store a set of tuning parameters. The signal matching module 13 also includes tuning buttons 132 corresponding to each storage bit. Each tuning button 132, upon triggering, controls the processor 122 to retrieve a set of tuning parameters stored in the corresponding storage bit and input them to the digital signal processor 121.

[0058] In this embodiment, multiple storage bits are set in the memory 123 to store multiple sets of tuning parameters, allowing the operator to pre-store multiple sets of tuning parameters in the memory 123. Simultaneously, by setting tuning buttons 132 that correspond one-to-one with the storage bits, the operator can trigger the corresponding tuning button 132 according to tuning needs. This causes the processor 122 to retrieve the complete set of tuning parameters stored in the corresponding storage bit and input it to the digital signal processor 121, thereby changing the current tuning effect and the final playback effect of the playback device. The operator can pre-store multiple sets of tuning parameters in the memory 123 and switch the tuning parameters at any time using the tuning button 132 to change the audio playback effect, eliminating the need to repeatedly write tuning parameters through the external device 2, making the operation more convenient.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, the signal selection module 13 also includes indicator lights 133 that correspond one-to-one with the tuning button 132. When the tuning button 132 is triggered, the corresponding indicator light 133 lights up, and the other indicator lights 133 turn off.

[0060] In this embodiment, by setting indicator lights 133 that correspond one-to-one with the tuning buttons 132, when one of the tuning buttons 132 is triggered, only the indicator light 133 corresponding to that tuning button 132 lights up, while the other indicator lights 133 remain off. This allows the indicator lights 133 to indicate the tuning parameters called by the current digital signal processor 121, making it convenient for operators to observe and operate.

[0061] In some embodiments, such as Figure 1 and Figure 2 As shown, the digital signal processor 121 is provided with a tuning interface 1211, which is used to connect to an external device 2 to receive tuning parameters input from the external device 2.

[0062] In this embodiment, by setting a tuning interface 1211 in the digital signal processor 121, the digital signal processor 121 can be directly connected to the external device 2 through the tuning interface 1211, receive the tuning parameters input by the external device 2, and modulate the first signal according to the tuning parameters, so that the operator can adjust the tuning parameters in real time through the external device 2 without affecting the tuning parameters stored in the memory 123.

[0063] In one specific embodiment, before inputting the tuning parameters into the memory 123 through the processor 122, the external device 2 can be connected to the digital signal processor 121 through the tuning interface 1211, and the tuning parameters can be input into the digital signal processor 121 for tuning. The tuning parameters are continuously adjusted on the external device 2 according to the playback effect of the playback device. After obtaining the tuning parameters that meet the requirements, they are saved on the external device 2. Then, the external device 2 is connected to the processor 122, the adjusted tuning parameters are input into the processor 122, and the processor 122 writes them into the memory 123 for storage.

[0064] Furthermore, in some embodiments, such as Figure 1 and Figure 2 As shown, the tuning module 12 also includes a switch 124, which is located between the digital signal processor 121 and the processor 122. The signal selection module 13 also includes a mode switch key 134, which is used to control the processor 122 to open or close the switch 124.

[0065] In this embodiment, a switch 124 is provided between the digital signal processor 121 and the processor 122. When the switch 124 is closed, the processor 122 and the digital signal processor 121 remain connected, so that the processor 122 can input the tuning parameters stored in the memory 123 into the digital signal processor 121. When the switch 124 is open, the processor 122 and the digital signal processor 121 are disconnected, and the processor 122 cannot input the tuning parameters into the digital signal processor 121. In this state, the digital signal processor 121 can still receive the tuning parameters input by the external device 2 through the tuning interface 1211. At the same time, it can avoid the digital signal processor 121 receiving the tuning parameters input by both the processor 122 and the external device 2 at the same time during the adjustment of the tuning parameters, which would interfere with the tuning process.

[0066] Meanwhile, the signal selection module 13 has a mode switching key 134. The operator can control the state of the switch 124 by operating the mode switching key 134, so that the switch 124 can be turned off when tuning is needed, and the switch 124 can be turned off when tuning parameters need to be retrieved by the processor 122 and input into the digital signal processor 121. The operation is convenient.

[0067] Figure 6 The circuit diagram showing the connection between switch 124, external device 2, and digital signal processor 121 is shown. Switch K1 is switch 124. The left pin of switch K1 is used to connect to digital signal processor 121 or processor 122, and the right pin of switch K1 is used to connect to external device 2.

[0068] Optionally, the mode switching key 134 can be an operating structure in the form of a button, knob, or toggle switch.

[0069] Specifically, in some embodiments, such as Figure 1 and Figure 2 As shown, the audio signal interface includes at least two of the following: A2B interface 111, SPDIF interface 112, and MP3 interface 113.

[0070] In this embodiment, the A2B interface 111 is used to connect to the vehicle audio bus to receive the audio signal input from the vehicle audio bus, convert it into a first signal, and transmit it to the digital signal processor 121; the SPDIF (Sony / Philips Digital Interface) interface 112 is used to connect to the optical fiber to receive the audio signal input from the optical fiber, convert it into a first signal, and transmit it to the digital signal processor 121; the MP3 interface 113 is used to connect to an external storage device to read the audio files stored in the external storage device (such as a USB flash drive, portable hard drive, etc.), convert the audio files into a first signal, and transmit it to the digital signal processor 121.

[0071] Specifically, the MP3 interface 113 includes a USB audio decoding chip of model BU94702AKV, which has MP3 encoding and decoding functions, and can decode MP3 audio files and convert them into a first signal for input to the digital signal processor 121.

[0072] The SPDIF interface 112 includes an optical fiber receiver and a TI DIR9001-Q1 digital audio interface receiver. The optical fiber receiver is used to receive the audio signal input from the optical fiber and transmit it to the TI DIR9001-Q1 digital audio interface receiver. The TI DIR9001-Q1 digital audio interface receiver processes and converts the audio signal and inputs it to the digital signal processor 121 for processing in I2S signal format (first signal).

[0073] Figure 3 and Figure 4 A partial circuit diagram of the SPDIF interface 112 is shown; fiber optic connector J7 is used to connect to an optical fiber to receive optical signals; an RCA (Radio Corporation of America) connector J5 is also provided for connection to an RCA audio cable. The signal received by either fiber optic connector J7 or RCA connector J5 is transmitted to buffer U12, and then output to converter U9 via the RXIN connector of buffer U12. Converter U9 converts the input signal into an I2S signal for output to digital signal processor 121.

[0074] The A2B interface 111 includes an automotive audio bus transceiver for use with the I2S / TDM interface of the digital signal processor 121, and uses a PH2.0 socket interface for connection to the vehicle audio bus.

[0075] Specifically, in some embodiments, such as Figure 1 and Figure 2 As shown, the audio signal interface includes an MP3 interface 113, which is used to read one or more audio files from an external storage device. The signal selection module 13 also includes a second switch key 135 connected to the MP3 interface 113, which is used to control the MP3 interface 113 to switch the currently read audio file after being triggered.

[0076] In this embodiment, the MP3 interface 113 is used to connect to an external storage device, which can store one or more audio files. The MP3 interface 113 reads one of the audio files and converts it into a first signal. By setting a second switching key 135 connected to the MP3 interface 113, the operator can switch the audio file currently read by the MP3 interface 113 by triggering the second switching key 135, so that the operator can play multiple audio files in the external storage device as needed and adjust the tuning parameters according to the playback effect.

[0077] In one specific embodiment, the second switch key 135 includes a first button and a second button. After the MP3 interface 113 is connected to the external storage device, it will sort all the audio files stored on the external storage device according to a certain sorting rule. During the tuning process, the MP3 interface 113 reads one of the audio files. If the first button is triggered, the MP3 interface 113 will read the audio file before the first audio file. If the second button is triggered, the MP3 interface 113 will read the audio file after the first audio file.

[0078] In some embodiments, such as Figure 1 As shown, the audio output module 14 includes an audio amplifier, which has multiple audio output interfaces, all of which are used to connect to a playback device.

[0079] In this embodiment, the audio amplifier can amplify the power of the second signal output by the tuning module 12 and connect to the playback device through multiple audio output interfaces to achieve multi-channel audio output playback, resulting in better audio playback effect.

[0080] Specifically, the audio amplifier can use the TDF8546 chip.

[0081] It is understood that in some embodiments, the audio tuning device 1 further includes a power supply module, which includes a DC-DC converter and a low-dropout regulator (LDO). The power supply module supplies power to the audio input module 11, tuning module 12, signal matching module 13, and audio output module 14. Specifically, the DC-DC converter converts the input 12V DC voltage to 3.3V DC voltage to supply power to the audio input module 11, tuning module 12, signal matching module 13 (excluding the part of indicator light 133), and audio output module 14, and the low-dropout regulator supplies power to indicator light 133.

[0082] Figure 7 and Figure 8 The circuit schematic of a portion of the power module is shown. Figure 7 The VBAT connector is used to connect to a battery or external power source. The input voltage, after passing through surge protection, interference prevention, and filtering circuits, is supplied to other electrical components via the VP1 interface. For example... Figure 8 As shown, the voltage output from the VP1 interface powers each indicator light 133 (i.e., LED0, LED1, LED2, etc. in the figure) after passing through the low dropout regulator IC1.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An audio mixing device, characterized in that, include: An audio input module includes at least two audio signal interfaces. The audio input module receives audio information through the audio signal interfaces and converts the audio information into a first signal. A tuning module is configured to connect to the audio input module and an external device respectively. The tuning module obtains tuning parameters from the external device and modulates the first signal into a second signal according to the tuning parameters. A signal selection module is connected to the tuning module, and the signal selection module is used to control the tuning module to selectively read the first signal output by one of at least two audio signal interfaces; An audio output module is connected to the tuning module, and the audio output module is used to convert the second signal into an audio output signal.

2. The audio tuning device according to claim 1, characterized in that, The tuning module includes a digital signal processor and a processor; the signal selection module includes a first switching key; The digital signal processor is connected to the audio input module and is used to modulate the first signal given by the audio input module into the second signal; The processor is connected to the signal matching module and the digital signal processor respectively. The first switch key is used to control the digital signal processor to read the first signal output by each of the audio signal interfaces in sequence after being triggered.

3. The audio tuning device according to claim 2, characterized in that, The tuning module further includes a memory; the processor is configured to be connected to both the memory and the external device. The processor is used to receive the tuning parameters input by the external device, write the tuning parameters into the memory for storage, and the processor is also used to retrieve the tuning parameters stored in the memory and input the tuning parameters into the digital signal processor.

4. The audio mixing device according to claim 3, characterized in that, The memory has multiple storage bits, each storage bit being used to store a set of the tuning parameters; the signal selection module also includes tuning buttons that correspond one-to-one with each of the storage bits. Each of the tuning buttons, upon being triggered, controls the processor to retrieve a set of tuning parameters stored in the corresponding storage bit and input them to the digital signal processor.

5. The audio tuning device according to claim 4, characterized in that, The signal selection module also includes indicator lights that correspond one-to-one with the tuning buttons. When a tuning button is triggered, the corresponding indicator light lights up, and the other indicator lights turn off.

6. The audio mixing device according to claim 3, characterized in that, The digital signal processor is provided with a tuning interface, which is used to connect to the external device to receive tuning parameters input from the external device.

7. The audio tuning device according to claim 6, characterized in that, The tuning module also includes a switching switch, which is disposed between the digital signal processor and the processor; The signal selection module also includes a mode switching key, which is used to control the processor to open or close the switching switch.

8. The audio tuning device according to claim 1, characterized in that, The audio signal interface includes at least two of the following: A2B interface, SPDIF interface, and MP3 interface.

9. The audio tuning device according to claim 1, characterized in that, The audio signal interface includes an MP3 interface, which is used to read one or more audio files from an external storage device; The signal selection module also includes a second switching key connected to the MP3 interface. The second switching key is used to control the MP3 interface to switch the currently read audio file after being triggered.

10. The audio tuning device according to claim 1, characterized in that, The audio output module includes an audio amplifier, which has multiple audio output interfaces, all of which are used to connect to a playback device.

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