Audio output device for testing vehicle-mounted power amplifier and vehicle-mounted power amplifier testing system

Abstract

The utility model provides an audio output device for testing a vehicle-mounted power amplifier and a vehicle-mounted power amplifier testing system. The device comprises an audio signal processing module, a clock module and at least one audio conversion module, a first clock signal end of the audio signal processing module is connected with a second clock signal end of the clock module; at least one first signal output end of the audio signal processing module is connected with an audio signal receiving end of at least one audio conversion module; the audio signal processing module is used for receiving a clock signal of the clock module and sending a first audio test signal to the at least one audio conversion module; the audio signal output end of the at least one audio conversion module is used for being connected with at least one vehicle-mounted power amplifier to be tested; and the at least one audio conversion module is used for converting the first audio test signal into a power amplifier test signal and sending the power amplifier test signal to the at least one vehicle-mounted power amplifier. According to the application, the cost of testing the vehicle-mounted power amplifier equipment can be reduced, and the testing efficiency of the vehicle-mounted power amplifier equipment can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of testing equipment for vehicle power amplifiers, specifically to an audio output device and a vehicle power amplifier testing system for testing vehicle power amplifiers. Background Technology

[0002] In existing technologies, the audio source for automotive amplifiers comes from the car infotainment system (MOS), which transmits audio signals to the amplifiers via an audio bus. Traditionally, automotive amplifier suppliers require OEMs to provide an MOS for testing amplifier performance. However, the development schedule of MOS is unpredictable, and there are numerous interconnected electronic devices. The limited number of MOS prototypes results in a shortage of MOS resources for testing automotive amplifiers, thus limiting testing efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies in the prior art and provide an audio output device and a vehicle amplifier testing system for testing vehicle amplifiers. This can reduce the dependence of vehicle amplifier testing on the car entertainment head unit, reduce the cost of vehicle amplifier testing equipment, and improve the testing efficiency of vehicle amplifier equipment.

[0004] The first embodiment of this utility model provides an audio output device for testing vehicle-mounted power amplifiers, comprising: an audio signal processing module, a clock module, and at least one audio conversion module; the audio signal processing module includes a first clock signal terminal and at least one first signal output terminal; the clock module includes a second clock signal terminal; and the audio conversion module includes an audio signal receiving terminal and an audio signal output terminal.

[0005] The first clock signal terminal of the audio signal processing module is connected to the second clock signal terminal of the clock module; at least one first signal output terminal of the audio signal processing module is connected to the audio signal receiving terminal of the at least one audio conversion module; the audio signal processing module is used to receive the clock signal of the clock module and send a first audio test signal to the at least one audio conversion module.

[0006] The audio signal output terminal of the at least one audio conversion module is used to connect to at least one vehicle-mounted power amplifier to be tested; the at least one audio conversion module is used to convert the first audio test signal into a power amplifier test signal and send the power amplifier test signal to the at least one vehicle-mounted power amplifier.

[0007] Compared to existing technologies, the audio output device of this utility model includes an audio signal processing module, a clock module, and at least one audio conversion module. The audio signal processing module generates a first audio test signal based on the clock signal from the clock module and sends the first audio test signal to at least one audio conversion module. The audio conversion module converts the received first audio test signal into a power amplifier test signal and sends it to the vehicle power amplifier. This allows the vehicle power amplifier to perform power amplifier function tests based on the power amplifier test signal, reducing the reliance on the car entertainment head unit for testing the vehicle power amplifier, lowering the cost of testing the vehicle power amplifier equipment, and improving the testing efficiency of the vehicle power amplifier equipment.

[0008] In one implementation, the audio signal processing module further includes a first signal input terminal;

[0009] The first signal input terminal of the audio signal processing module is used to connect to the first audio interaction device; the audio signal processing module is used to convert the sound source signal output by the first audio interaction device into a second audio test signal, and send the second audio test signal to the at least one audio conversion module.

[0010] In this embodiment, based on the connection between the audio signal processing module and the first audio interaction device, the audio signal processing module can convert the audio source signal output by the first audio interaction device into a second audio test signal and send the second audio test signal to at least one audio conversion module, which can increase the methods of obtaining audio test signals and the types of audio test signals.

[0011] In one embodiment, the audio output device further includes an audio decoding and encoding module; the audio signal processing module further includes a second signal input terminal;

[0012] The second signal input terminal of the audio signal processing module is used to connect to the second audio interaction device through the audio decoding and encoding module; the audio decoding and encoding module is used to decode and encode the audio source signal output by the second audio interaction device and then transmit it to the audio signal processing module; the audio signal processing module is used to convert the signal output by the audio decoding and encoding module into a third audio test signal and send the third audio test signal to the audio conversion module.

[0013] In this embodiment, based on the connection relationship between the audio signal processing module, the audio decoding and encoding module and the second audio interaction device, the audio signal processing module can convert the audio source signal output by the second audio interaction device after being encoded and decoded by the audio decoding and encoding module into a third audio test signal, and send the third audio test signal to at least one audio conversion module, which can increase the methods of obtaining audio test signals and the types of audio test signals.

[0014] In one embodiment, the audio signal processing module further includes a second signal output terminal;

[0015] The second signal output terminal of the audio signal processing module is used to connect to the third audio interaction device; the audio signal processing module is used to send the first audio test signal to the third audio interaction device.

[0016] In this embodiment, the audio signal processing module can send a first audio test signal to the third audio interactive device through the second signal output terminal, so that the third audio interactive device can quickly obtain the first audio test signal from the audio signal processing module.

[0017] In one embodiment, the audio output device further includes a digital-to-analog conversion module and a filtering module; the audio signal processing module further includes a third signal output terminal;

[0018] The third signal output terminal of the audio signal processing module is connected to the analog signal receiving device through the digital-to-analog conversion module and the filtering module; the audio signal processing module is used to send the first audio test signal to the analog signal receiving device through the digital-to-analog conversion module and the filtering module.

[0019] In this embodiment, the first audio test signal output by the audio signal processing module is converted into an analog signal by the digital-to-analog conversion module, and then the analog signal is filtered by the filtering module before being sent to the analog signal receiving device, so that the analog signal receiving device can accurately obtain the analog signal corresponding to the first audio test signal.

[0020] In one embodiment, the audio output device further includes a power management module; the power management module includes an input terminal, a first output terminal, and a second output terminal; wherein the output voltage of the first output terminal is greater than that of the second output terminal; the audio conversion module includes a first power terminal; and the audio signal processing module includes a second power terminal.

[0021] The input terminal of the power management module is connected to the power supply; the first output terminal of the power management module is connected to the first power supply terminal of the at least one audio conversion module.

[0022] The second power output terminal of the power management module is connected to the second power output terminal of the audio signal processing module.

[0023] In this embodiment, the audio conversion module and the audio signal processing module are powered by the power management module, which enables the audio conversion module and the audio signal processing module to operate stably.

[0024] In one implementation, the power management module includes a first buck circuit and a second buck circuit;

[0025] The first step-down circuit includes a first step-down chip, a first filter unit, and a second filter unit; the input terminal of the first step-down chip is the input terminal of the power management module, and the output terminal of the first step-down chip is the first output terminal of the power management module; the input terminal of the first step-down chip is grounded through the first filter unit, and the output terminal of the first step-down chip is grounded through the second filter unit.

[0026] In this embodiment, the voltage stability of the first output terminal of the power management module can be improved by using the first step-down chip, the first filter unit, and the second filter unit, thereby improving the circuit safety of the audio conversion module.

[0027] In one implementation, the power management module includes a second buck circuit;

[0028] The second step-down circuit includes a second step-down chip and an energy storage unit; the input terminal of the second step-down chip is the input terminal of the power management module, the output terminal of the second step-down chip is connected to the input terminal of the energy storage unit, and the output terminal of the energy storage unit is the second output terminal of the power management module.

[0029] In this embodiment, the impact of voltage fluctuations on the audio signal processing module can be reduced by using the second step-down chip and the energy storage unit, thereby improving the circuit safety of the audio signal processing module.

[0030] In one embodiment, the audio output device further includes at least one indicator light module; the audio signal processing module further includes a fourth signal output terminal corresponding to the at least one first signal output terminal; the at least one fourth signal output terminal of the audio signal processing module is connected to the at least one indicator light module.

[0031] In this embodiment, the on / off state of the indicator light module can indicate whether the first signal output terminal of the corresponding audio signal processing module outputs the first audio test signal, making it convenient for users to accurately determine whether the first signal output terminal of the audio signal processing module outputs the first audio test signal.

[0032] The second embodiment of this utility model provides a vehicle power amplifier testing system, including an audio output device and an audio analysis device for testing vehicle power amplifiers as described above; the audio analysis device includes an audio input terminal;

[0033] At least one audio signal output terminal of the audio output device is connected to a first connection terminal of at least one vehicle amplifier to be tested; a second connection terminal of the at least one vehicle amplifier is connected to a speaker, and the audio input terminal of the audio analysis device is connected to the second connection terminal of the vehicle amplifier.

[0034] Compared with the prior art, the audio output device of this utility model sends a power amplifier test signal to the vehicle power amplifier, and then uses an audio analysis device to detect the audio signal sent by the vehicle power amplifier to the speaker to analyze and test the operation of the vehicle power amplifier. This can reduce the dependence of the vehicle power amplifier on the car entertainment head unit, reduce the cost of the vehicle power amplifier testing equipment, and improve the testing efficiency of the vehicle power amplifier equipment.

[0035] To provide a clearer understanding of this invention, the specific embodiments of the invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0036] Figure 1 This is a schematic diagram showing the connection between the car entertainment host and the amplifier according to one embodiment of the present invention.

[0037] Figure 2 This is a module connection diagram of an audio output device for testing a vehicle-mounted power amplifier according to an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram showing the connection between the DSP chip and the A2B chip in one embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram showing the connection between the audio signal processing module and the audio interaction device of an audio output device according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram showing the connection of the first signal input terminal of the audio signal processing module according to an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram showing the connection between the DSP chip and the XMOS chip in one embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram showing the connection between the DSP chip and the DAC chip in one embodiment of the present invention.

[0043] Figure 8 This is a connection diagram of the power management module of an audio output device according to an embodiment of the present invention.

[0044] Figure 9 This is a circuit diagram of a first step-down circuit according to an embodiment of the present invention.

[0045] Figure 10This is a circuit diagram of a second step-down circuit according to an embodiment of the present invention.

[0046] Figure 11 This is a circuit diagram of the third step-down circuit according to an embodiment of the present invention.

[0047] Figure 12 This is a circuit diagram of the fourth step-down circuit according to an embodiment of the present invention.

[0048] Figure 13 This is a connection diagram of a vehicle-mounted power amplifier testing system according to an embodiment of the present invention.

[0049] 10. Audio output device; 11. Audio signal processing module; 13. Clock module; 15. Audio conversion module; 17. Power management module; 19. Indicator light module; 20. Audio analysis device; 100. Vehicle power amplifier testing system. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] A power amplifier, or power amplifier, is a fundamental component of an audio system. In an audio system, the power amplifier amplifies weak electrical signals and outputs them to the speakers to drive them and produce sound. A car amplifier is a power amplifier used in car audio systems. If a car amplifier malfunctions, it will directly affect the sound emitted by the car's speakers, leading to sound quality problems such as distortion, noise, or low volume.

[0052] Please see Figure 1 In the existing technology, since the audio source of the vehicle power amplifier comes from the car entertainment head unit, the vehicle power amplifier equipment supplier needs to ask the OEM to provide a car entertainment head unit for testing when testing the power amplifier performance indicators. However, there are many electronic devices linked to the car entertainment head unit, but the number of car entertainment head unit prototypes is limited, resulting in a lack of car entertainment head unit resources for testing vehicle power amplifier equipment, which limits the testing efficiency of vehicle power amplifier equipment.

[0053] The audio output device of this application can output a first audio test signal through an audio signal processing module, and then convert the first audio test signal into a power amplifier test signal through an audio conversion module and transmit it to the vehicle power amplifier under test. This reduces the dependence of vehicle power amplifier equipment testing on the car entertainment host, reduces the testing cost of vehicle power amplifier equipment, and improves the testing efficiency of vehicle power amplifier equipment.

[0054] Please see Figure 2 This is a module connection diagram of an audio output device 10 for testing a vehicle power amplifier according to an embodiment of the present invention, including: an audio signal processing module 11, a clock module 13, and at least one audio conversion module 15; the audio signal processing module 11 includes a first clock signal terminal and at least one first signal output terminal; the clock module 13 includes a second clock signal terminal; the audio conversion module 15 includes an audio signal receiving terminal and an audio signal output terminal;

[0055] The first clock signal terminal of the audio signal processing module 11 is connected to the second clock signal terminal of the clock module 13; at least one first signal output terminal of the audio signal processing module 11 is connected to the audio signal receiving terminal of at least one audio conversion module 15; the audio signal processing module 11 is used to receive the clock signal of the clock module 13 and send a first audio test signal to at least one audio conversion module 15.

[0056] The audio signal output terminal of at least one audio conversion module 15 is used to connect to at least one vehicle-mounted power amplifier to be tested; the at least one audio conversion module 15 is used to convert the first audio test signal into a power amplifier test signal and send the power amplifier test signal to at least one vehicle-mounted power amplifier.

[0057] The audio conversion module 15 is a DSP chip, which is a chip capable of implementing digital signal processing technology. DSP chips can be used for sound effect adjustment, audio restoration, and noise reduction. Furthermore, DSP chips can also function as signal generators. Based on the clock signal provided by the clock module 13, the DSP chip can generate various different signal sources such as white noise, pink noise, and sine waves to serve as the first audio test signal, for example, a DSP chip with the model number ADSP-21565.

[0058] The first audio test signal output by the audio conversion module 15 is a TDM signal (Time Division Multiplexing signal). TDM is a communication technology that transmits multiple data streams through time division. The DSP chip determines the clock rate and timing of data transmission based on the clock signal provided by the clock module 13 in order to output the TDM signal.

[0059] Clock module 13 is a crystal oscillator, or simply crystal oscillator. A crystal oscillator is an electronic oscillator circuit that uses the inverse piezoelectric effect, meaning that when an electric field is applied to a piezoelectric material, mechanical deformation occurs. Therefore, it utilizes the mechanical resonance of the vibrating crystal of the piezoelectric material to generate electrical signals with very precise frequencies. The commonly used piezoelectric material is quartz crystal.

[0060] The audio conversion module 15 is an A2B chip, which acts as a transceiver for the automotive audio bus (A2B), used to connect and manage audio and communication devices within the vehicle. The A2B chip converts the TDM signal output from the DSP chip into a power amplifier test signal. This power amplifier test signal is an I2S signal (Inter-IC Sound). The I2S signal protocol is a protocol used for digital audio transmission, primarily for transmitting digital audio data between devices within a system. Therefore, the I2S signal protocol is widely used in various multimedia systems, ensuring accurate audio data transmission, supporting multi-channel applications, and enabling multi-channel transmission by increasing the number of I2S interfaces or connecting other I2S devices.

[0061] Please see Figure 3 The first signal output terminal of the audio signal processing module 11 is the DOUT terminal of the DSP chip, and the audio signal receiving terminal of the audio conversion module 15 is the DIN terminal of the A2B chip.

[0062] Compared with the prior art, the audio output device 10 of this utility model includes an audio signal processing module 11, a clock module 13, and at least one audio conversion module 15. The audio signal processing module 11 is used to generate a first audio test signal according to the clock signal of the clock module 13 and send the first audio test signal to at least one audio conversion module 15. The audio conversion module 15 is used to convert the received first audio test signal into a power amplifier test signal and send the power amplifier test signal to the vehicle power amplifier. This allows the vehicle power amplifier to perform power amplifier function tests based on the power amplifier test signal, which can reduce the dependence of testing the vehicle power amplifier on the car entertainment head unit, reduce the cost of testing the vehicle power amplifier equipment, and improve the testing efficiency of the vehicle power amplifier equipment.

[0063] Please see Figure 4 and Figure 5 In one feasible embodiment, the audio signal processing module 11 further includes a first signal input terminal; the first signal input terminal of the audio signal processing module 11 is the SPDIF_IN terminal of the DSP chip connected to the optical fiber interface 1.

[0064] The first signal input terminal of the audio signal processing module 11 is used to connect to the first audio interaction device; the audio signal processing module 11 is used to convert the audio source signal output by the first audio interaction device into a second audio test signal, and send the second audio test signal to at least one audio conversion module 15.

[0065] The first audio interaction device can be an electronic device connected to the DSP chip via fiber optic interface 1, such as a computer, smartphone, or smart tablet that communicates with the DSP chip via fiber optic communication. The computer, smartphone, or smart tablet can connect to the fiber optic device via network communication technology, and then connect to fiber optic interface 1 to achieve fiber optic communication with the DSP chip.

[0066] In this embodiment, based on the connection between the audio signal processing module 11 and the first audio interaction device, the audio signal processing module 11 can convert the audio source signal output by the first audio interaction device into a second audio test signal and send the second audio test signal to at least one audio conversion module 15, which can increase the methods of obtaining audio test signals and the types of audio test signals.

[0067] Please see Figure 4 and Figure 6 In one feasible embodiment, the audio output device 10 further includes an audio decoding and encoding module; the audio signal processing module 11 further includes a second signal input terminal. The audio decoding and encoding module is an XMOS chip, and the second signal input terminal of the audio signal processing module 11 is the DIN terminal of a DSP chip. An XMOS chip is a sound card chip used for decoding and encoding audio signals, supporting multiple audio signal transmission protocols. In this embodiment, an XMOS chip of model XU316-1024-QF60B-C24 can be used as the audio signal processing module 11.

[0068] The second signal input terminal of the audio signal processing module 11 is used to connect to the second audio interaction device through the audio decoding and encoding module; the audio decoding and encoding module is used to decode and encode the audio source signal output by the second audio interaction device and then transmit it to the audio signal processing module 11; the audio signal processing module 11 is used to convert the signal output by the audio decoding and encoding module into a third audio test signal and send the third audio test signal to the audio conversion module 15.

[0069] The second audio interaction device can be an electronic device such as a computer, smartphone, or tablet that can connect and communicate with a USB-Type-C connector. In this embodiment, the audio conversion module 15 is connected to the second audio interaction device via a USB-Type-C connector to receive the audio source signal output by the second audio interaction device.

[0070] In this embodiment, based on the connection relationship between the audio signal processing module 11, the audio decoding and encoding module and the second audio interaction device, the audio signal processing module 11 can convert the audio source signal output by the second audio interaction device after being encoded and decoded by the audio decoding and encoding module into a third audio test signal, and send the third audio test signal to at least one audio conversion module 15, which can increase the methods of obtaining audio test signals and the types of audio test signals.

[0071] Please see Figure 5 and 6 In one feasible embodiment, the audio signal processing module 11 further includes a second signal output terminal; the second signal output terminal of the audio signal processing module 11 may be the SPDIF_OUT terminal of the DSP chip connected to the optical fiber interface 2, or it may be the DOUT terminal of the DSP chip connected to the DIN terminal of the XMOS chip.

[0072] The second signal output terminal of the audio signal processing module 11 is used to connect to the third audio interaction device; the audio signal processing module 11 is used to send the first audio test signal to the third audio interaction device.

[0073] The third audio interaction device can be an electronic device connected to the DSP chip via fiber optic interface 1, such as a computer, smartphone, or tablet that communicates with the DSP chip via fiber optic communication. These electronic devices can connect to the fiber optic device via network communication technology, and then connect to fiber optic interface 1 to achieve fiber optic communication with the DSP chip. At this time, the audio signal processing module 11 can also be used to send a third audio test signal to the third audio interaction device.

[0074] The third audio interaction device can also be an electronic device such as a computer, smartphone, or tablet connected to the DSP chip via the XMOS chip. In this case, the audio signal processing module 11 can also be used to send a second audio test signal to the third audio interaction device.

[0075] In this embodiment, the audio signal processing module 11 can send a first audio test signal to the third audio interaction device through the second signal output terminal, so that the third audio interaction device can quickly obtain the first audio test signal of the audio signal processing module 11.

[0076] Please see Figure 7In one feasible embodiment, the audio output device 10 further includes a digital-to-analog converter module and a filtering module; the audio signal processing module 11 further includes a third signal output terminal; the digital-to-analog converter module is a DAC chip, which is an electronic chip that can convert digital signals into analog signals. The third signal output terminal of the audio signal processing module 11 is the DOUT terminal connected to the DAC chip.

[0077] The third signal output terminal of the audio signal processing module 11 is connected to the analog signal receiving device through the digital-to-analog conversion module and the filtering module; the audio signal processing module 11 is used to send the first audio test signal to the analog signal receiving device through the digital-to-analog conversion module and the filtering module.

[0078] The filtering module can remove noise from the signal to improve the signal quality of the analog signal converted by the digital-to-analog converter.

[0079] In this embodiment, the first audio test signal output by the audio signal processing module 11 is converted into an analog signal by the digital-to-analog conversion module, and then the analog signal is filtered by the filtering module before being sent to the analog signal receiving device, so that the analog signal receiving device can accurately obtain the analog signal corresponding to the first audio test signal.

[0080] Please read Figure 8 In one feasible embodiment, the audio output device 10 further includes a power management module 17; the power management module 17 includes an input terminal, a first output terminal, and a second output terminal; wherein the output voltage of the first output terminal is greater than that of the second output terminal; the audio conversion module 15 includes a first power terminal; and the audio signal processing module 11 includes a second power terminal.

[0081] The input terminal of the power management module 17 is connected to the power supply; the first output terminal of the power management module 17 is connected to the first power supply terminal of at least one audio conversion module 15.

[0082] The second power output terminal of the power management module 17 is connected to the second power output terminal of the audio signal processing module 11.

[0083] The power management module 17 can be MPQ2029-AEC1 or MPQ2143-AEC1. The output voltage of the first output terminal of the power management module 17 is 8.5V, and the output voltage of the second output terminal of the power management module 17 is 3.3V.

[0084] In this embodiment, the power management module 17 supplies power to the audio conversion module 15 and the audio signal processing module 11 respectively, which enables the audio conversion module 15 and the audio signal processing module 11 to operate stably.

[0085] Please see Figure 9In one feasible embodiment, the power management module 17 includes a first buck circuit and a second buck circuit;

[0086] The first step-down circuit includes a first step-down chip U1, a first filter unit, and a second filter unit. The input terminal of the first step-down chip is the input terminal of the power management module 17, and the output terminal of the first step-down chip is the first output terminal of the power management module 17. The input terminal of the first step-down chip is grounded through the first filter unit, and the output terminal of the first step-down chip is grounded through the second filter unit.

[0087] The first filter unit includes capacitors C3 and C4, and the second filter unit includes capacitors C5 and C6. The input terminal (pin 8) of the first buck chip U1 is the input terminal of the power management module 17, and the input terminal of the first buck chip U1 is grounded through capacitors C3 and C4. The output terminal (pin 1) of the first buck chip U1 is the first output terminal of the power management module 17, and the output terminal of the first buck chip U1 is grounded through capacitors C5 and C6.

[0088] In this embodiment, the voltage stability of the first output terminal of the power management module 17 can be improved by using the first step-down chip U1, the first filter unit, and the second filter unit, thereby improving the circuit safety of the audio conversion module 15.

[0089] Please see Figure 10 In one feasible embodiment, the power management module 17 includes a second buck circuit;

[0090] The second step-down circuit includes a second step-down chip U2 and an energy storage unit; the input terminal of the second step-down chip is the input terminal of the power management module 17, the output terminal of the second step-down chip is connected to the input terminal of the energy storage unit, and the output terminal of the energy storage unit is the second output terminal of the power management module 17.

[0091] The energy storage unit is an inductor L1. The input terminal (pin 2) of the second step-down chip is the input terminal of the power management module 17. The input terminal of the second step-down chip U2 is grounded through capacitors C7, C8, C9 and C10 respectively. The output terminal (pin 12) of the second step-down chip U2 is connected to the input terminal of the energy storage unit. The output terminal of the energy storage unit is the second output terminal of the power management module 17. The output terminal of the second step-down chip U2 is grounded through capacitors C11, C12, C13 and C14 respectively.

[0092] Specifically, when the current output by the second step-down chip U2 increases, the energy storage unit stores electrical energy; when the current output by the second step-down chip U2 decreases, the energy storage unit releases electrical energy to stabilize the voltage output to the audio signal processing module 11.

[0093] In this embodiment, the impact of voltage fluctuations on the audio signal processing module 11 can be reduced by using the second step-down chip and the energy storage unit, thereby improving the circuit safety of the audio signal processing module 11.

[0094] Please see Figure 11 The power management module 17 also includes a third buck circuit; the third buck circuit includes a third buck chip and multiple filter capacitors. The third buck chip is U3, and its input terminal (pin 1) is connected to the output terminal of the energy storage unit. The input terminal of the third buck chip is grounded through filter capacitors C17 and C18 respectively. The output terminal (pin 5) of the third buck chip is connected to the VREF terminal of the DSP chip to provide a reference voltage to the DSP chip. The output terminal of the third buck chip is grounded through filter capacitors C25 and C26 respectively.

[0095] Please see Figure 12 The power management module 17 also includes a fourth buck circuit; the fourth buck circuit includes a fourth buck chip and multiple filter capacitors. The fourth buck chip is U4, and its input terminal (pin 1) is connected to the output terminal of the energy storage unit. The input terminal of the fourth buck chip is grounded through filter capacitors C19 and C20 respectively. The output terminal (pin 7) of the fourth buck chip is connected to the input terminal of inductor L2. The output terminal of inductor L2 is connected to the VCORE terminal of the DSP chip and the VCORE terminal of the XMOS chip respectively to provide the base voltage of the core unit to the DSP chip and the XMOS chip. The output terminal of inductor L2 is grounded through filter capacitors C21, C22 and C23 respectively.

[0096] In one feasible embodiment, the audio output device 10 further includes at least one indicator light module 19; the audio signal processing module 11 further includes a fourth signal output terminal corresponding to at least one first signal output terminal; the at least one fourth signal output terminal of the audio signal processing module 11 is connected to at least one indicator light module 19.

[0097] The fourth signal output terminal of the audio signal processing module 11 corresponds to the first signal output terminal. Therefore, when the first signal output terminal of the audio signal processing module 11 sends the first audio test signal to the connected audio conversion module 15, the fourth signal output terminal of the corresponding audio signal processing module 11 also sends a working signal to the connected indicator module 19, causing the indicator module 19 to light up, so as to indicate the audio signal processing module 11 that has received the first audio test signal.

[0098] In this embodiment, the on / off state of the indicator light module 19 can indicate whether the first signal output terminal of the corresponding audio signal processing module 11 outputs the first audio test signal, making it convenient for users to accurately determine whether the first signal output terminal of the audio signal processing module 11 outputs the first audio test signal.

[0099] The audio output device 10 of this application is also equipped with a debugging interface and an upgrade interface, which can perform software upgrades and debugging on the internal DSP chip through an external debugger and programmer. The debugging interface and upgrade interface use a standard Mini-USB interface.

[0100] Please see Figure 13 The second embodiment provides a vehicle power amplifier testing system 100, including an audio output device 10 and an audio analysis device 20 for testing vehicle power amplifiers as described above; the audio analysis device 20 includes an audio input terminal;

[0101] At least one audio signal output terminal of the audio output device 10 is connected to the first connection terminal of at least one vehicle amplifier to be tested; the second connection terminal of at least one vehicle amplifier is connected to a speaker, and the audio input terminal of the audio analysis device 20 is connected to the second connection terminal of the vehicle amplifier.

[0102] Compared with the prior art, the audio output device 10 of the vehicle power amplifier test system 100 of this utility model sends a power amplifier test signal to the vehicle power amplifier, and then the audio analysis device 20 detects the audio signal sent by the vehicle power amplifier to the speaker to analyze and test the operation of the vehicle power amplifier. This can reduce the dependence of the vehicle power amplifier on the car entertainment host, reduce the cost of the vehicle power amplifier test equipment, and improve the test efficiency of the vehicle power amplifier equipment.

[0103] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An audio output device for testing vehicle-mounted power amplifiers, characterized in that, include: An audio signal processing module, a clock module, and at least one audio conversion module; The audio signal processing module includes a first clock signal terminal and at least one first signal output terminal; the clock module includes a second clock signal terminal; the audio conversion module includes an audio signal receiving terminal and an audio signal output terminal. The first clock signal terminal of the audio signal processing module is connected to the second clock signal terminal of the clock module; at least one first signal output terminal of the audio signal processing module is connected to the audio signal receiving terminal of the at least one audio conversion module; the audio signal processing module is used to receive the clock signal of the clock module and send a first audio test signal to the at least one audio conversion module. The audio signal output terminal of the at least one audio conversion module is used to connect to at least one vehicle-mounted power amplifier to be tested; the at least one audio conversion module is used to convert the first audio test signal into a power amplifier test signal and send the power amplifier test signal to the at least one vehicle-mounted power amplifier.

2. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio signal processing module also includes a first signal input terminal; The first signal input terminal of the audio signal processing module is used to connect to the first audio interaction device; the audio signal processing module is used to convert the sound source signal output by the first audio interaction device into a second audio test signal, and send the second audio test signal to the at least one audio conversion module.

3. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio output device further includes an audio decoding and encoding module; the audio signal processing module further includes a second signal input terminal; The second signal input terminal of the audio signal processing module is used to connect to the second audio interaction device through the audio decoding and encoding module; the audio decoding and encoding module is used to decode and encode the audio source signal output by the second audio interaction device and then transmit it to the audio signal processing module; the audio signal processing module is used to convert the signal output by the audio decoding and encoding module into a third audio test signal and send the third audio test signal to the audio conversion module.

4. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio signal processing module also includes a second signal output terminal; The second signal output terminal of the audio signal processing module is used to connect to the third audio interaction device; the audio signal processing module is used to send the first audio test signal to the third audio interaction device.

5. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio output device further includes a digital-to-analog conversion module and a filtering module; the audio signal processing module further includes a third signal output terminal; The third signal output terminal of the audio signal processing module is connected to the analog signal receiving device through the digital-to-analog conversion module and the filtering module; the audio signal processing module is used to send the first audio test signal to the analog signal receiving device through the digital-to-analog conversion module and the filtering module.

6. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio output device further includes a power management module; the power management module includes an input terminal, a first output terminal, and a second output terminal; wherein the output voltage of the first output terminal is greater than that of the second output terminal; the audio conversion module includes a first power terminal; and the audio signal processing module includes a second power terminal. The input terminal of the power management module is connected to the power supply; the first output terminal of the power management module is connected to the first power supply terminal of the at least one audio conversion module. The second power output terminal of the power management module is connected to the second power output terminal of the audio signal processing module.

7. The audio output device for testing vehicle-mounted power amplifiers according to claim 6, characterized in that, The power management module includes a first step-down circuit; The first step-down circuit includes a first step-down chip, a first filter unit, and a second filter unit; the input terminal of the first step-down chip is the input terminal of the power management module, and the output terminal of the first step-down chip is the first output terminal of the power management module; the input terminal of the first step-down chip is grounded through the first filter unit, and the output terminal of the first step-down chip is grounded through the second filter unit.

8. The audio output device for testing vehicle-mounted power amplifiers according to claim 6, characterized in that, The power management module includes a second buck circuit; The second step-down circuit includes a second step-down chip and an energy storage unit; the input terminal of the second step-down chip is the input terminal of the power management module, the output terminal of the second step-down chip is connected to the input terminal of the energy storage unit, and the output terminal of the energy storage unit is the second output terminal of the power management module.

9. The audio output device for testing vehicle-mounted power amplifiers according to claim 1, characterized in that, The audio output device further includes at least one indicator light module; the audio signal processing module further includes a fourth signal output terminal corresponding to the at least one first signal output terminal; the at least one fourth signal output terminal of the audio signal processing module is connected to the at least one indicator light module.

10. A vehicle-mounted power amplifier testing system, characterized in that, Includes an audio output device and an audio analysis device for testing vehicle power amplifiers as described in any one of claims 1-9; the audio analysis device includes an audio input terminal; At least one audio signal output terminal of the audio output device is connected to a first connection terminal of at least one vehicle amplifier to be tested; a second connection terminal of the at least one vehicle amplifier is connected to a speaker, and the audio input terminal of the audio analysis device is connected to the second connection terminal of the vehicle amplifier.

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