Audio power amplifier equipment test system

Abstract

The utility model relates to the technical field of audio product testing, and provides an audio power amplifier equipment testing system, which comprises audio conversion equipment, channel switching equipment and testing equipment, the audio conversion equipment is used for receiving a first audio signal of a sound source, realizing output of multiple paths of second audio signals and transmitting the multiple paths of second audio signals to the power amplifiers to be tested in a one-to-one correspondence manner; the channel switching equipment is used for controlling the plurality of to-be-tested power amplifiers to be connected with the test equipment in sequence, and the test equipment comprises a loudspeaker or an audio analyzer. According to the utility model, through establishing consistent test channels for different to-be-tested power amplifiers, subjective or objective test comparison can be accurately carried out on the different to-be-tested power amplifiers, and in an actual test, the difference of different audio power amplifier devices in the same batch can be effectively identified, and the test cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of audio product testing, in particular to an audio power amplifier equipment testing system. Background Art

[0002] Audio amplifier equipment is also called audio power amplifier. It mainly amplifies the weaker signal input from the audio source equipment and generates a large enough current to drive the speaker to reproduce the sound. Therefore, the performance of the audio amplifier equipment directly affects the sound quality of the speaker playback.

[0003] Considering power, impedance, dynamics, different usage ranges and control adjustment functions, different audio amplifiers differ in signal processing, circuit design and production processes. Even audio amplifiers with the same specifications will have slight differences in relevant performance parameters when leaving the factory. However, in practical applications, the performance of a single audio amplifier can only be judged by listening to the sound, which makes it difficult to effectively identify the differences between different audio amplifiers in the same batch. Utility Model Content

[0004] The utility model provides an audio power amplifier device testing system, which is used to at least solve or improve the current problem that it is difficult to effectively identify the differences between different audio power amplifier devices in the same batch.

[0005] The utility model provides an audio power amplifier device testing system, comprising: an audio conversion device, a channel switching device and a testing device;

[0006] The audio conversion device is used to receive a first audio signal from a sound source, output multiple channels of second audio signals, and transmit the multiple channels of second audio signals to multiple power amplifiers to be tested in a one-to-one correspondence;

[0007] The channel switching device is used to control the plurality of power amplifiers to be tested to be connected to the test device in sequence, and the test device includes a speaker or an audio analyzer.

[0008] According to an audio power amplifier device testing system provided by the utility model, the audio conversion device includes a plurality of signal interfaces, a signal processing module and a first control module;

[0009] One of the plurality of signal interfaces is used as a signal input interface, and the signal input interface is used to receive the first audio signal;

[0010] The signal processing module is used to process the first audio signal from the signal input interface to obtain the second audio signal;

[0011] The first control module is used to configure the output channel of the signal processing module, and output the second audio signal in multiple channels through at least part of the plurality of signal interfaces;

[0012] Among them, at least some of the multiple signal interfaces are of the same interface type.

[0013] According to an audio power amplifier device testing system provided by the utility model, the signal interface includes an analog signal interface, and the analog signal interface is connected to the signal processing module through an analog-to-digital conversion module.

[0014] According to an audio power amplifier device testing system provided by the utility model, the signal interface comprises an SPDIF interface, and the SPDIF interface is connected to the signal processing module.

[0015] According to an audio power amplifier device testing system provided by the utility model, the signal interface includes an optical fiber interface, and the optical fiber interface is connected to the signal processing module through a photoelectric conversion module.

[0016] According to an audio power amplifier device testing system provided by the utility model, the signal interface includes an A2B interface, and the A2B interface is connected to the signal processing module through an A2B conversion module.

[0017] According to an audio power amplifier device testing system provided by the utility model, two A2B interfaces are provided, and the two A2B interfaces are matched with the two A2B conversion modules in a one-to-one manner; wherein the two A2B interfaces are used to establish a one-to-one corresponding connection with the two power amplifiers to be tested.

[0018] According to an audio power amplifier device testing system provided by the utility model, the channel switching device comprises: a switching switch and a second control module;

[0019] The switching switch is provided between the plurality of power amplifiers to be tested and the testing device, and the second control module is connected to the switching switch;

[0020] The second control module is used to receive a control instruction from the human-computer interaction module, and control the switching state of the switch according to the control instruction.

[0021] According to an audio power amplifier device testing system provided by the utility model, the channel switching device is configured with multiple input interfaces and one output interface;

[0022] The plurality of input interfaces are used to be connected to the plurality of power amplifiers to be tested in a one-to-one correspondence and are connected to the switching switch; the switching switch is connected to the output interface, and the output interface is connected to the test equipment;

[0023] The switching switch is used to control the multiple input interfaces to be selectively electrically connected to the output interface.

[0024] According to an audio power amplifier device testing system provided by the utility model, the switching switch includes a relay;

[0025] The relay has a coil, a normally open contact and a normally closed contact; the second control module is connected to the coil, the normally open contact is connected in series between one of the power amplifiers to be tested and the test equipment, and the normally open contact is connected in series between another power amplifier to be tested and the test equipment.

[0026] The audio power amplifier device test system provided by the utility model is configured with an audio conversion device, a channel switching device and a test device. In an actual test process, a first audio signal output by a sound source is transmitted to the audio conversion device, the audio conversion device converts the first audio signal into a second audio signal with multiple outputs, and transmits the multiple second audio signals to a plurality of power amplifiers to be tested in a one-to-one correspondence. Each power amplifier to be tested performs power amplification processing on the second audio signal received by each power amplifier to be tested, and then uses the channel switching device to apply the amplified audio signals of each power amplifier to the same test device in sequence to test the performance of each power amplifier to be tested. Wherein, in the case where the test device is a loudspeaker, the tester realizes a subjective test comparison of the differences between different audio power amplifier devices by listening to and recognizing the sounds emitted by the loudspeaker; in the case where the test device is an audio analyzer, the audio analyzer quantitatively analyzes the audio parameters output by each corresponding power amplifier to be tested to realize an objective test comparison of the differences between different audio power amplifier devices.

[0027] From the above, it can be seen that the test system described in the utility model facilitates accurate subjective or objective test comparison of different power amplifiers to be tested by building consistent test channels for different power amplifiers to be tested. In actual tests, it can effectively identify the differences between different audio power amplifier devices in the same batch, saving testing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a control structure block diagram of the audio power amplifier equipment test system provided by the utility model;

[0030] Figure 2It is a control structure block diagram of the audio conversion device provided by the utility model;

[0031] Figure 3 It is a control structure block diagram of the channel switching device provided by the utility model;

[0032] Reference numerals:

[0033] 1. Audio source; 2. Audio conversion equipment; 3. Amplifier to be tested; 4. Channel switching equipment; 5. Test equipment; 6. Human-computer interaction module;

[0034] 21. signal interface; 211. analog signal interface; 212. SPDIF interface; 213. A2B interface; 22. signal processing module; 23. first control module; 24. analog-to-digital conversion module; 25. A2B conversion module; 26. first power module; 261. first power interface; 262. first power conversion module;

[0035] 41. Switch; 42. Second control module; 43. Input interface; 44. Output interface; 45. Communication interface; 46. Second power module; 461. Second power interface; 462. Second power conversion module. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Combine the following Figure 1-Figure 3 , the audio power amplifier device testing system provided by the embodiment of the utility model is described in detail through specific embodiments and application scenarios.

[0038] like Figure 1 As shown, an embodiment of the utility model provides an audio power amplifier device testing system, including: an audio conversion device 2, a channel switching device 4 and a testing device 5.

[0039] The audio conversion device 2 is used to receive the first audio signal of the audio source 1, output multiple channels of second audio signals, and transmit the multiple channels of second audio signals to multiple power amplifiers 3 to be tested in a one-to-one correspondence.

[0040] The channel switching device 4 is used to control a plurality of power amplifiers 3 to be tested to be connected to a test device 5 in sequence. The test device 5 includes a speaker or an audio analyzer.

[0041] It can be understood that the audio source 1 is electrically connected to the input side of the audio conversion device 2, the output side of the audio conversion device 2 is electrically connected to the input side of each power amplifier 3 to be tested, the output side of each power amplifier 3 to be tested is electrically connected to the channel switching device 4, and the channel switching device 4 is electrically connected to the test equipment 5.

[0042] According to common knowledge in the art, the audio conversion device 2 is generally used to realize the conversion of multiple different types of audio signals. In the application scenario of the present application, after receiving the first audio signal inputted by the audio source 1 in a single channel, the audio conversion device 2 adds or subtracts gain and / or converts the audio format of the first audio signal to obtain a second audio signal, and then outputs the second audio signal in multiple channels.

[0043] The audio formats of the first audio signal and the second audio signal may be the same or different, and no specific limitation is made thereto. Optionally, the second audio signal may be an analog audio signal or an A2B audio signal.

[0044] In order to accurately identify the differences between different power amplifiers 3 under test, in this embodiment, the audio conversion device 2 is arranged on the input side of multiple power amplifiers 3 under test to ensure that the multiple power amplifiers 3 under test all perform power amplification processing on the same type of second audio signal.

[0045] At the same time, on the output side of each power amplifier 3 to be tested, through the configured channel switching device 4, each power amplifier 3 to be tested can be quickly controlled to be connected to the test device 5 in turn, and the audio signal amplified and processed by each power amplifier 3 to be tested is applied to the same test device 5, thereby ensuring the consistency and fairness of the test standards for each power amplifier 3 to be tested, preventing other factors from affecting the test results, and facilitating a better comparison of the differences between different power amplifiers 3 to be tested.

[0046] For the test system shown in the present invention, by configuring an audio conversion device 2, a channel switching device 4 and a test device 5, in the actual test process, the first audio signal output by the sound source 1 is transmitted to the audio conversion device 2, the audio conversion device 2 converts the first audio signal into a second audio signal with multiple outputs, and transmits the multiple second audio signals to multiple power amplifiers 3 to be tested in a one-to-one correspondence, each power amplifier 3 to be tested performs power amplification processing on the second audio signal received by each power amplifier 3, and then uses the channel switching device 4 to apply the amplified audio signals of each power amplifier 3 to the same test device 5 in sequence to test the performance of each power amplifier 3 to be tested; wherein, in the case where the test device 5 is a speaker, the tester realizes a subjective test comparison of the differences between different audio power amplifier devices by listening to and identifying the sound emitted by the speaker; in the case where the test device 5 is an audio analyzer, the audio analyzer quantitatively analyzes the audio parameters output by each corresponding power amplifier 3 to be tested, so as to realize an objective test comparison of the differences between different audio power amplifier devices.

[0047] As can be seen from the above, the test system described in the utility model builds consistent test channels for different power amplifiers 3 to be tested, which facilitates accurate subjective or objective test comparison of different power amplifiers 3 to be tested. In actual tests, it can effectively identify the differences between different audio power amplifier devices in the same batch, saving testing costs.

[0048] It should be pointed out here that when an audio analyzer is used for objective testing, the audio analyzer is configured with an analog resistor whose resistance is the same as the equivalent resistance of the speaker. Both ends of the analog resistor are connected in parallel on the output side of the channel switching device 4. The audio analyzer collects the voltage across the analog resistor to obtain the audio parameters output by the power amplifier 3 to be tested.

[0049] In some embodiments, Figure 2 As shown, the audio conversion device 2 includes a plurality of signal interfaces 21 , a signal processing module 22 and a first control module 23 .

[0050] One of the plurality of signal interfaces 21 serves as a signal input interface, and the signal input interface is used to receive a first audio signal from the audio source 1 .

[0051] The signal processing module 22 is used to process the first audio signal from the signal input interface to obtain a second audio signal.

[0052] The first control module 23 is used to configure the output channel of the signal processing module 22, and output the second audio signal in multiple channels through at least some of the multiple signal interfaces 21. At least some of the multiple signal interfaces 21 are of the same interface type.

[0053] It is understandable that at least three signal interfaces 21 can be configured, one of which serves as a signal input interface, and all other signal interfaces 21 can be configured as the same interface type to output multiple second audio signals of the same specification, and transmit the multiple second audio signals one by one to multiple power amplifiers 3 to be tested.

[0054] Of course, among the multiple signal interfaces 21, in addition to the signal interface 21 used as the signal input interface, other signal interfaces 21 can also be configured as different interface types. However, it is only necessary to configure at least two of these signal interfaces 21 as the same interface type to meet the test comparison requirements of at least two power amplifiers 3 to be tested.

[0055] The signal processing module 22 may be a DSP module. The DSP module adopts the ADAU1452WBCPZ chip developed by ADI, has 48 channels, 32-bit digital signal input / output, and supports an audio sampling rate of up to 192 kHz.

[0056] After the signal input interface transmits the first audio signal to the signal processing module 22, the signal processing module 22 performs functions such as adding and subtracting gain and providing sound effects on the audio signal; when the signal processing module 22 completes the processing of the first audio signal and obtains the second audio signal, the first control module 23 controls the signal processing module 22 to output the second audio signal to several designated signal interfaces 21 to achieve multi-channel output of the second audio signal.

[0057] Among them, the first control module 23 can be a microprocessor, which is a product based on the ARM Cortex-M4F / M0 core. It communicates through I2C to coordinate the communication configuration between the control signal processing module 22 and each signal interface 21, and realizes initialization and normal operation with the signal processing module 22 through the SPI protocol.

[0058] In some embodiments, Figure 2 As shown, the signal interface 21 includes an analog signal interface 211 , and the analog signal interface 211 is connected to the signal processing module 22 through the analog-to-digital conversion module 24 .

[0059] Specifically, the model used by the analog-to-digital conversion module 24 is PCM3168A, which has 6 analog differential inputs, 8 analog differential outputs, and contains 24-bit ADC and DAC.

[0060] If the analog signal interface 211 is used as the signal input interface, the first audio signal output by the audio source 1 reaches the analog-to-digital conversion module 24 through the analog signal interface 211. The analog-to-digital conversion module 24 performs analog-to-digital conversion processing on the first audio signal, converts the first audio signal into a TDM audio signal, and then transmits it to the signal processing module 22 for audio processing.

[0061] If the analog signal interface 211 is used as the signal output interface, the audio signal provided by the signal processing module 22 is converted by the analog-to-digital conversion module 24 and then output in the form of an analog signal through the analog signal interface 211 .

[0062] In practical applications, when the power amplifier 3 to be tested can receive analog signal input, multiple analog signal interfaces 211 can be provided, and multiple analog signal interfaces 211 are connected to multiple power amplifiers 3 to be tested in a one-to-one correspondence.

[0063] In some embodiments, Figure 2 As shown, the signal interface 21 includes an SPDIF interface 212 , and the SPDIF interface 212 is connected to the signal processing module 22 .

[0064] Specifically, the SPDIF interface 212 is a digital audio interface customized by Sony and Philips, which can realize digital signal transmission using low-cost hardware. SPDIF is divided into output (SPDIF OUT) and input (SPDIF IN). The SPDIF interface 212 is usually used to transmit compressed audio signals. It is customized by the IEC 61937 standard and is widely used in projectors and televisions.

[0065] In practical applications, the SPDIF interface 212 can be connected to the signal processing module 22 through a single-ended to differential module. The single-ended to differential module converts the single-ended audio signal output by the signal processing module 22 into a differential audio signal output. This design can effectively enhance the signal's anti-interference ability.

[0066] In some embodiments, the signal interface 21 includes an optical fiber interface, which is connected to the signal processing module 22 via an optoelectronic conversion module.

[0067] Specifically, the photoelectric conversion module may adopt an optical fiber receiver of the Everlight PLR135 / T series, which may convert the optical signal transmitted by the optical fiber into an electrical signal, and transmit the electrical signal to the signal processing module 22 , which performs signal processing.

[0068] Among them, based on the configuration of the optoelectronic conversion module, the optical fiber interface can be used as both a signal input interface and a signal output interface.

[0069] In some embodiments, Figure 2 As shown, the signal interface 21 includes an A2B interface 213 , and the A2B interface 213 is connected to the signal processing module 22 via an A2B conversion module 25 .

[0070] Specifically, the A2B conversion module 25 uses the AD2428 chip, developed by ADI, which is a digital processing module for car audio transmission with high-bandwidth bidirectional digital audio characteristics. The signal processing module 22 can communicate within a distance of up to 15 meters and can transmit I2S / TDM / PDM data, I2C control information, and clock and power supply signals through a twisted pair.

[0071] In actual application, the A2B conversion module 25 transmits audio signals with the upper and lower level devices through the A2B interface 213. When the A2B interface 213 is used as a signal input interface, the A2B conversion module 25 converts the A2B audio signal (first audio signal) from the A2B interface 213 into a TDM signal, and then transmits the TDM signal to the signal processing module 22, which performs relevant gain and sound effect processing; accordingly, when the A2B interface 213 is used as a signal output interface, the second audio signal output by the signal processing module 22 can be converted into an A2B audio signal by the A2B conversion module 25, and then output through the A2B interface 213.

[0072] Furthermore, if Figure 1 and Figure 2 As shown, two A2B interfaces 213 are provided, and the two A2B interfaces 213 are matched with the two A2B conversion modules 25 in a one-to-one manner; wherein the two A2B interfaces 213 are used to establish a one-to-one corresponding connection with the two power amplifiers 3 to be tested.

[0073] In actual applications, after the first audio signal in analog or digital form is input to the audio conversion device 2, the audio conversion device 2 processes and converts the first audio signal, outputs two second audio signals (A2B audio signals), and transmits the two second audio signals to two power amplifiers 3 to be tested. The power amplifier 3 to be tested outputs the amplified audio signal, which is then switched into one channel through the channel switching device 4 and output to the test device 5 for subjective or objective test comparison, thereby ensuring the consistency and fairness of the test and being able to better compare the differences between the two power amplifiers 3 to be tested.

[0074] Based on the scheme shown in the above embodiment, the audio conversion device 2 shown in this embodiment can realize the conversion between multiple audio formats and A2B format, such as SPDIF to A2B, A2B to A2B, optical fiber to A2B, optical fiber to SPDIF, analog to A2B, analog to SPDIF, etc. Its main purpose is to provide standard A2B audio signals for products with A2B interface 213, while also making it have wide expansibility and can be cascaded with existing audio conversion products.

[0075] Furthermore, if Figure 2 As shown, the audio conversion device 2 shown in this embodiment is also configured with a first power module 26, the first power module 26 includes a first power interface 261 and a first power conversion module 262, the first power interface 261 and the first power conversion module 262 are electrically connected, and the first power conversion module 262 is electrically connected to each signal interface 21, the signal processing module 22 and the first control module 23 respectively, so as to provide different levels of working power for these functional modules.

[0076] In some embodiments, Figure 3 As shown, the channel switching device 4 includes: a switch 41 and a second control module 42;

[0077] The switch 41 is disposed between the plurality of power amplifiers 3 to be tested and the test equipment 5, and the second control module 42 is connected to the switch 41;

[0078] The second control module 42 is used to receive control instructions from the human-computer interaction module 6 and control the switching state of the switch 41 according to the control instructions.

[0079] It is understandable that, according to the number of power amplifiers 3 to be tested, the switch 41 is configured with a corresponding number of switching states, so as to enable multiple power amplifiers 3 to be tested to establish electrical connections with the same test device 5 in sequence.

[0080] The switching switch 41 can adopt an electric conversion switch known in the art to switch and control the connection status between multiple power amplifiers 3 to be tested and the test equipment 5, or it can use the open / close contacts on switching devices such as circuit breakers and relays to switch the connection status between multiple power amplifiers 3 to be tested and the test equipment 5.

[0081] The second control module 42 may adopt a microprocessor known in the art. The second control module 42 is configured with a communication interface 45 . The second control module 42 establishes a communication connection with the human-computer interaction module 6 through the communication interface 45 .

[0082] Among them, the communication interface 45 can be a USB interface or a Type-c interface known in the art, and the human-computer interaction module 6 can be a desktop computer, a laptop computer or a touch screen controller known in the art.

[0083] In actual applications, the human-computer interaction module 6 is configured with an operation interface, and a virtual button can be set on the operation interface. The operator can input a control instruction by pressing the virtual button. The human-computer interaction module 6 sends the control instruction to the second control module 42, and the second control module 42 responds to the control instruction to control the switching state of the switching switch 41.

[0084] In some embodiments, Figure 3 As shown, the channel switching device 4 is configured with a plurality of input interfaces 43 and an output interface 44 .

[0085] The multiple input interfaces 43 are used to be connected to the multiple power amplifiers 3 to be tested in a one-to-one correspondence, and are connected to the switching switch 41 ; the switching switch 41 is connected to the output interface 44 , and the output interface 44 is connected to the test equipment 5 .

[0086] The switch 41 is used to control the multiple input interfaces 43 to be selectively electrically connected to the output interface 44 .

[0087] It is understandable that this embodiment configures the channel switching device 4 with an input interface 43 and an output interface 44, which can facilitate on-site connection or assembly of relevant electrical circuits during on-site testing, without the need to directly assemble the relevant connection circuits to the switching switch 41, thereby avoiding affecting the relevant performance of the switching switch 41.

[0088] To improve line connection efficiency, both the input interface 43 and the output interface 44 may be configured as plug-in interfaces.

[0089] In some embodiments, the switching switch 41 includes a relay; the relay has a coil, a normally open contact and a normally closed contact; the second control module 42 is connected to the coil, the normally open contact is connected in series between one power amplifier 3 to be tested and the test equipment 5, and the normally open contact is connected in series between another power amplifier 3 to be tested and the test equipment 5.

[0090] It is understandable that when testing and comparing two power amplifiers 3 to be tested, the switching switch 41 is configured as a relay, and the electrical properties of the relay can be fully utilized. Since no matter whether the coil of the relay is in a powered state or in a powered-off state, the switching states of the normally open contact and the normally closed contact of the relay are in opposite states, after completing the test of one power amplifier 3 to be tested, it is only necessary to control the coil of the relay to be powered on or powered off through the second control module 42, and the switching states of the normally open contact and the normally closed contact will be reversed at the same time, so that the current power amplifier 3 to be tested is disconnected from the test equipment 5, and the other power amplifier 3 to be tested is immediately connected to the test equipment 5, so as to facilitate the test and comparison of the two power amplifiers 3 to be tested.

[0091] Furthermore, if Figure 3As shown, the channel switching device 4 of this embodiment is configured with a second power supply module 46, which includes a second power supply interface 461 and a second power supply conversion module 462. The second power supply interface 461 and the second power supply conversion module 462 are electrically connected, and the second power supply conversion module 462 is electrically connected to the switching switch 41 and the second control module 42, respectively, to provide different levels of working power for these functional modules.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An audio power amplifier device testing system, characterized in that: include: Audio conversion equipment, channel switching equipment and test equipment; The audio conversion device is used to receive a first audio signal from a sound source, output multiple channels of second audio signals, and transmit the multiple channels of second audio signals to multiple power amplifiers to be tested in a one-to-one correspondence; The channel switching device is used to control the plurality of power amplifiers to be tested to be connected to the test device in sequence, and the test device includes a speaker or an audio analyzer.

2. The audio power amplifier device testing system according to claim 1, characterized in that: The audio conversion device includes a plurality of signal interfaces, a signal processing module and a first control module; One of the plurality of signal interfaces is used as a signal input interface, and the signal input interface is used to receive the first audio signal; The signal processing module is used to process the first audio signal from the signal input interface to obtain the second audio signal; The first control module is used to configure the output channel of the signal processing module, and output the second audio signal in multiple channels through at least part of the plurality of signal interfaces; Among them, at least some of the multiple signal interfaces are of the same interface type.

3. The audio power amplifier device testing system according to claim 2, characterized in that: The signal interface comprises an analog signal interface, and the analog signal interface is connected to the signal processing module via an analog-to-digital conversion module.

4. The audio power amplifier device testing system according to claim 2, characterized in that: The signal interface comprises an SPDIF interface, and the SPDIF interface is connected to the signal processing module.

5. The audio power amplifier device testing system according to claim 2, characterized in that: The signal interface comprises an optical fiber interface, and the optical fiber interface is connected to the signal processing module via a photoelectric conversion module.

6. The audio power amplifier device testing system according to claim 2, characterized in that: The signal interface comprises an A2B interface, and the A2B interface is connected to the signal processing module via an A2B conversion module.

7. The audio power amplifier device testing system according to claim 6, characterized in that: There are two A2B interfaces, and the two A2B interfaces are matched with the two A2B conversion modules one by one; The two A2B interfaces are used to establish a one-to-one corresponding connection with the two power amplifiers to be tested.

8. The audio power amplifier device testing system according to any one of claims 1 to 7, characterized in that: The channel switching device comprises: a switching switch and a second control module; The switching switch is provided between the plurality of power amplifiers to be tested and the testing device, and the second control module is connected to the switching switch; The second control module is used to receive a control instruction from the human-computer interaction module, and control the switching state of the switch according to the control instruction.

9. The audio power amplifier device testing system according to claim 8, characterized in that: The channel switching device is configured with multiple input interfaces and one output interface; The plurality of input interfaces are used to be connected to the plurality of power amplifiers to be tested in a one-to-one correspondence and are connected to the switching switch; the switching switch is connected to the output interface, and the output interface is connected to the test equipment; The switching switch is used to control the multiple input interfaces to be selectively electrically connected to the output interface.

10. The audio power amplifier device testing system according to claim 8, characterized in that: The switching switch includes a relay; The relay has a coil, a normally open contact and a normally closed contact; the second control module is connected to the coil, the normally open contact is connected in series between one of the power amplifiers to be tested and the test equipment, and the normally open contact is connected in series between another power amplifier to be tested and the test equipment.

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