Audio equipment testing device

Abstract

The utility model discloses an audio equipment testing device, which is characterized in that a microphone is connected to an input decoding module for decoding conversion and then is output to an output signal processing module, and effective signals output by the output signal processing module are transmitted to an MCU (Microprogrammed Control Unit), so that the microphone can be tested and calibrated; the sound source generation module is controlled by the MCU to generate sound source signals of different wave modes to the loudspeaker, the loudspeaker can be tested and calibrated, and the input decoding module, the output signal processing module, the sound source generation module and the MCU are integrated on the same PCB. According to the application, self-testing of the audio equipment testing device and function testing of the microphone and the loudspeaker to be tested can be realized, and the testing efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of audio equipment testing, in particular to an audio equipment testing device. BACKGROUND

[0002] In practical applications, in order to ensure that the audio performance of these devices meets the expected standard, it is necessary to strictly test the audio equipment. However, with the rapid development of technology, the innovation and wide application of audio products are promoted, and the microphone and loudspeaker are often integrated in the audio equipment, and the products become more diversified and intelligent, which leads to different testing standards and technologies for different audio equipment, which makes the difficulty and requirement of audio equipment testing higher and higher, and the traditional audio equipment testing can only test different functions of the product one by one, such as testing the loudspeaker alone and testing the microphone alone, which is low in testing efficiency. Therefore, the existing testing device cannot completely meet the demand of efficient testing of different audio equipment. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to overcome the shortcomings of the prior art and provide an audio equipment testing device with complete functions and higher testing efficiency.

[0004] The audio equipment testing device provided by the embodiment of the present application comprises:

[0005] An input decoding module, an input end of the input decoding module being used for connecting with a to-be-tested microphone, a first standard microphone and a second standard microphone, the input decoding module being used for converting audio signals of the to-be-tested microphone and the first standard microphone into analog audio signals or directly outputting audio signals of the second standard microphone;

[0006] An output signal processing module, an input end of the output signal processing module being connected with an output end of the input decoding module, the output signal processing module being used for processing audio signals output by the input decoding module and outputting effective signals;

[0007] An audio source generating module, a data output end of the audio source generating module being used for connecting with a to-be-tested loudspeaker;

[0008] A micro control unit (MCU), the MCU being connected with an input end of the audio source generating module and an output end of the output signal processing module;

[0009] A PCB (printed circuit board), the input decoding module, the output signal processing module, the audio source generating module and the MCU being integrated on the PCB;

[0010] The MCU is configured to output a control signal to the sound source generation module, and the sound source generation module is configured to generate a to-be-tested sound source signal according to the control signal and output the to-be-tested sound source signal to the to-be-tested loudspeaker.

[0011] The MCU is further configured to calibrate the to-be-tested microphone and the to-be-tested loudspeaker according to the effective signal.

[0012] According to some embodiments of the present application, the input decoding module comprises a signal switching circuit, a decoding chip, a fourth relay and a fifth relay; the signal input ends of the fourth relay and the fifth relay are connected with the first channel output end and the second channel output end of the decoding chip respectively, the signal output ends of the fourth relay and the fifth relay are connected with the output signal processing module, and the signal switching circuit is configured to control the communication state between the decoding chip and the first standard microphone, the second standard microphone and the to-be-tested microphone.

[0013] According to some embodiments of the present application, the signal switching circuit comprises a relay control sub-circuit, a first microphone access sub-circuit and a second microphone access sub-circuit; the plurality of control input ends of the relay control sub-circuit are connected with the MCU, the plurality of control output ends of the relay control sub-circuit are connected with the two control ends of the first microphone access sub-circuit, the two control ends of the second microphone access sub-circuit, the common end of the fourth relay and the common end of the fifth relay respectively, the signal input end of the first microphone access sub-circuit is connected with the first standard microphone and the to-be-tested microphone, and the first microphone access sub-circuit is configured to output the audio signal of the first standard microphone to the decoding chip according to the control signal input by the relay control sub-circuit; the signal input end of the second microphone access sub-circuit is connected with the second standard microphone, and the second microphone access sub-circuit is configured to directly output the audio signal of the second standard microphone according to the control signal input by the relay control sub-circuit.

[0014] According to some embodiments of the present application, the first microphone access sub-circuit comprises a first relay, a second relay and a third relay, the first signal input end and the second signal input end of the second relay and the third relay are configured to be connected with the first channel signal output end and the second channel signal output end of the to-be-tested microphone and the first standard microphone, the output end of the first relay is connected with the voltage supply end of the to-be-tested microphone and the first standard microphone, the signal output ends of the second relay and the third relay are connected with the input end of the decoding chip, and the common ends of the first relay, the second relay and the third relay are connected with the control output ends of the relay control sub-circuit one by one.

[0015] According to some embodiments of the present application, the second microphone access sub-circuit comprises a sixth relay and a seventh relay, two first input control terminals of the seventh relay are connected with signal output terminals of the fourth relay and the fifth relay respectively, a second input control terminal of the seventh relay is connected with an output terminal of the sixth relay; two first output control terminals and a second output control terminal of the seventh relay are connected with input terminals of the output signal processing module; a common terminal of the seventh relay is connected with a control output terminal of the relay control sub-circuit correspondingly; a signal input terminal of the sixth relay is used for being connected with a signal output terminal of a second standard microphone, the second standard microphone and the first standard microphone are different in type.

[0016] According to some embodiments of the present application, the processing operation of the output signal processing module comprises an automatic control amplification circuit, a band-pass filter circuit and an alternating current effective value conversion circuit, a signal input terminal of the automatic control amplification circuit is connected with an output terminal of the input decoding module, a signal input terminal of the band-pass filter circuit is connected with an output terminal of the automatic control amplification circuit, a signal input terminal of the alternating current effective value conversion circuit is connected with an output terminal of the band-pass filter circuit, and a signal output terminal of the alternating current effective value conversion circuit is connected with the MCU.

[0017] According to some embodiments of the present application, the automatic control amplification circuit comprises an amplifier and a first regulator, a signal input terminal of the amplifier is connected with an output terminal of the input decoding module, a signal output terminal of the amplifier is connected with a signal input terminal of the band-pass filter circuit, and the first regulator is connected with a gain adjustment pin of the amplifier.

[0018] According to some embodiments of the present application, the band-pass filter circuit comprises an active filter chip, the alternating current effective value conversion circuit comprises an RMS-DC converter, a signal input terminal of the active filter chip is connected with a signal output terminal of the amplifier, a signal input terminal of the RMS-DC converter is connected with a signal output terminal of the active filter chip, and a signal output terminal of the RMS-DC converter is connected with the MCU; a model of the active filter chip is set as MF10CCWM; and a model of the RMS-DC converter is set as AD8436ARQZ.

[0019] According to some embodiments of the present application, the sound source generation module comprises a wave type generator, a second regulator and a sound source output circuit, a signal output end of the wave type generator and a signal input end of the sound source output circuit are connected with the second regulator, a control input end of the wave type generator and the second regulator is connected with the MCU, the wave type generator is used for generating an audio signal according to a sound source generation control signal of the control input end, and the sound source output circuit is used for outputting the audio signal to a loudspeaker; the wave type generator is AD9833.

[0020] According to some embodiments of the present application, the audio device testing device further comprises a power supply, the power supply is provided with a plurality of voltage output ends, and the plurality of voltage output ends are respectively connected with the input decoding module, the output signal processing module, the sound source generation module and the MCU.

[0021] The embodiments of the present application can realize the testing and calibration of the microphone by inputting the microphone into the input decoding module, outputting the decoded and converted signal to the output signal processing module, and transmitting the effective signal output by the output signal processing module to the MCU. The testing and calibration of the loudspeaker can be realized by generating different wave type sound source signals to the loudspeaker through the MCU control sound source generation module. The input decoding module, the output signal processing module, the sound source generation module and the MCU are integrated on the same PCB, so that the same audio device testing device can simultaneously calibrate and test the microphone and the loudspeaker of the audio device. Compared with the related art, the audio device testing device of the embodiments of the present application has higher testing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in combination with the drawings and embodiments, in which:

[0023] Figure 1 FIG. 1 is a structural schematic diagram of the audio device testing device of the present application;

[0024] Figure 2 FIG. 3 is a structural connection diagram of the input decoding module in one embodiment of the audio device testing device of the present application;

[0025] Figure 3 FIG. 4 is a structural connection diagram of the input decoding module in another embodiment of the audio device testing device of the present application;

[0026] Figure 4 FIG. 5 is a circuit structural schematic diagram of the amplifier in one embodiment of the audio device testing device of the present application;

[0027] Figure 5 FIG. 6 is a circuit structural schematic diagram of the regulator in one embodiment of the audio device testing device of the present application;

[0028] Figure 6 Fig. 6 is a schematic diagram of a circuit structure of an active filter chip in an embodiment of the audio device testing apparatus of the present application;

[0029] Figure 7 Fig. 7 is a schematic diagram of a circuit structure of an RMS-DC converter in an embodiment of the audio device testing apparatus of the present application;

[0030] Figure 8 Fig. 8 is a schematic diagram of a circuit structure of a wave type sound generator in an embodiment of the audio device testing apparatus of the present application;

[0031] Figure 9 Fig. 9 is a schematic diagram of a circuit structure of a sound source output circuit in an embodiment of the audio device testing apparatus of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] It should be noted that, in the description of the embodiments of the present application, the terms “comprise”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the statement “comprises a” does not exclude the presence of another identical element in the process, method, article or device comprising the element. The terms “upper”, “lower” and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation” and the like should be understood broadly, which can be direct connection or indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms “first”, “second” and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0035] Figure 1 is a test device diagram provided by the embodiment of the application. Referring to Figure 1 , the embodiment of the application provides an audio device test device, comprising:

[0036] The input decoding module 200 is connected with the to-be-tested microphone, the first standard microphone and the second standard microphone at the input end of the input decoding module 200, and the input decoding module 200 is used for converting the audio signals of the to-be-tested microphone and the first standard microphone into analog audio signals or directly outputting the audio signals of the second standard microphone;

[0037] The output signal processing module 300 is connected with the output end of the input decoding module 200 at the input end of the output signal processing module 300, and the output signal processing module 300 is used for processing the audio signals output by the input decoding module 200 and outputting effective signals;

[0038] The sound source generation module 400 is connected with the to-be-tested loudspeaker at the data output end of the sound source generation module 400;

[0039] The micro control unit MCU 500 is connected with the input end of the sound source generation module 400 and the output end of the output signal processing module 300;

[0040] The PCB 100 is used for integrating the input decoding module 200, the output signal processing module 300, the sound source generation module 400 and the MCU 500;

[0041] The MCU 500 is used for outputting a control signal to the sound source generation module 400, and the sound source generation module 400 is used for generating a to-be-tested sound source signal according to the control signal and outputting the to-be-tested sound source signal to the to-be-tested loudspeaker;

[0042] The MCU 500 is further used for calibrating the to-be-tested microphone and the to-be-tested loudspeaker according to the effective signals.

[0043] The embodiment of the application can realize the test and calibration of the microphone by connecting the microphone to the input decoding module, converting and outputting the microphone to the output signal processing module, and transmitting the effective signals output by the output signal processing module to the MCU. The test and calibration of the loudspeaker can be realized by generating different wave type sound source signals to the loudspeaker through the MCU control sound source generation module. The input decoding module, the output signal processing module, the sound source generation module and the MCU of the application are integrated on the same PCB, so that the same audio device test device can simultaneously calibrate and test the microphone and the loudspeaker of the audio device. The audio device test device of the embodiment of the application has higher test efficiency.

[0044] In some embodiments, the audio device testing apparatus further comprises a plurality of interface terminals, and the input decoding module 200 is connected with the to-be-tested microphone, the first standard microphone and the second standard microphone through three interface terminals respectively.

[0045] The input decoding module 200, the output signal processing module 300 and the sound source generating module 400 can be implemented by integrated chips with corresponding functions or electronic discrete components, and the specific circuit structure of the input decoding module 200, the output signal processing module 300 and the sound source generating module 400 is not limited in the embodiments of the present application.

[0046] In an embodiment, the input decoding module 200 comprises a signal switching circuit, a decoding chip, a fourth relay and a fifth relay; the signal input ends of the fourth relay and the fifth relay are connected with the first channel output end and the second channel output end of the decoding chip respectively, the signal output ends of the fourth relay and the fifth relay are connected with the output signal processing module, and the signal switching circuit is used for controlling the communication state between the decoding chip and the first standard microphone, the second standard microphone and the to-be-tested microphone.

[0047] It can be understood that the communication state between the signal input end and the signal output end of the fourth relay and the connection relationship between the signal input end and the signal output end of the fifth relay can be realized respectively by controlling the common ends of the fourth relay and the fifth relay respectively, so that the individual testing of different channels can be realized.

[0048] The signal switching circuit comprises a relay control sub-circuit, a first microphone access sub-circuit and a second microphone access sub-circuit; the plurality of control input ends of the relay control sub-circuit are connected with the MCU, the plurality of control output ends of the relay control sub-circuit are connected with the two control ends of the first microphone access sub-circuit, the control end of the second microphone access sub-circuit, the common end of the fourth relay and the common end of the fifth relay respectively, the signal input end of the first microphone access sub-circuit is connected with the first standard microphone and the to-be-tested microphone, and the first microphone access sub-circuit is used for selecting the audio signal of the first standard microphone or the to-be-tested microphone to be output to the decoding chip according to the control signal input to different control ends by the relay control sub-circuit; the signal input end of the second microphone access sub-circuit is connected with the second standard microphone, and the second microphone access sub-circuit is used for directly outputting the audio signal of the second standard microphone according to the control signal input by the relay control sub-circuit.

[0049] The relay control sub-circuit can be realized by a transistor chip with multiple enable control, and in some embodiments, the relay control sub-circuit comprises an ULN2003.

[0050] The first microphone access sub-circuit comprises a first relay, a second relay and a third relay, the first signal input end and the second signal input end of the second relay and the third relay are used for being connected with the first sound channel signal output end and the second sound channel signal output end of the to-be-tested microphone and the first standard microphone, the output end of the first relay is connected with the voltage supply end of the to-be-tested microphone and the first standard microphone, the signal output end of the second relay and the third relay is connected with the input end of the decoding chip, and the common end of the first relay, the second relay and the third relay is connected with the control output end of the relay control sub-circuit in one-to-one correspondence.

[0051] The first relay is controlled to select to supply power to the to-be-tested microphone and the first standard microphone, the first signal input end and the signal output end of the second relay are turned on to realize the first sound channel test of the microphone, the second signal input end and the signal output end of the second relay are turned on to realize the second sound channel test of the microphone, and the third relay can also realize the first sound channel test and the second sound channel test by controlling the turn-on relationship of the corresponding first signal input end, the second signal input end and the signal output end. The first sound channel and the second sound channel are different. The two signal input ends of the second relay are not limited in how to be connected with the to-be-tested microphone and the first standard microphone, for example, the second relay can be connected with the first sound channel signal output end and the second sound channel signal output end of the to-be-tested microphone, the third relay can be connected with the first sound channel signal output end and the second sound channel signal output end of the first microphone, or the second relay can be connected with the first sound channel signal output end of the to-be-tested microphone and the second sound channel signal output end of the first microphone.

[0052] The second microphone access sub-circuit comprises a sixth relay and a seventh relay, the two first input control ends of the seventh relay are connected with the signal output end of the fourth relay and the fifth relay respectively, the second input control end of the seventh relay is connected with the output end of the sixth relay, the two first output control ends and the second output control end of the seventh relay are connected with the input end of the output signal processing module, the common end of the seventh relay is connected with the control output end of the relay control sub-circuit in correspondence, and the signal input end of the sixth relay is used for being connected with the signal output end of the second standard microphone.

[0053] The first output control end and the first input control end are a contact group connected in one-to-one correspondence, and the second input control end and the second output control end are a contact group connected in one-to-one correspondence. According to the turn-on state of the common end of the seventh relay, the turn-on or turn-off of the contact group is realized.

[0054] By providing the first microphone access sub-circuit, whether to enable the collection of the audio signals of the first standard microphone and the to-be-tested microphone can be controlled. By providing the second microphone access sub-circuit, whether to enable the collection of the audio signals of the second standard microphone can be controlled.

[0055] The model of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay is not limited in the embodiments of the present application. A relay with different pin numbers can be selected by a person skilled in the art according to the signal to be transmitted. The normally open contact and the normally closed contact of the relay can be selectively set by a person skilled in the art according to the signal to be transmitted. For example, the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay in the present application all adopt the model NEC5V.

[0056] For example, the first standard microphone connected to the input decoding module 200 is taken as an example, and as shown in FIG. 2, the audio equipment testing device can be first tested by connecting the first standard microphone and the standard sound source. The first standard microphone is powered by the first relay. The first standard microphone collects the first channel audio signal and the second channel audio signal emitted by the loudspeaker. The first channel audio signal and the second channel audio signal are transmitted to the decoding chip through the third relay. The decoding chip decodes and converts the first channel audio signal and the second channel audio signal and outputs them to the fourth relay and the fifth relay, respectively. The fourth relay and the fifth relay transmit the decoded audio signals to the two first input control terminals of the seventh relay. Finally, the signal is output to the output signal processing module for processing through the seventh relay. Figure 2 For example, the to-be-tested microphone connected to the input decoding module 200 is taken as an example, and as shown in FIG. 3, the to-be-tested microphone is connected for testing. The to-be-tested microphone is powered by the first relay. The to-be-tested microphone collects the first channel audio signal and the second channel audio signal emitted by the loudspeaker. The first channel audio signal and the second channel audio signal are transmitted to the decoding chip through the second relay. The decoding chip decodes and converts the first channel audio signal and the second channel audio signal and outputs them to the fourth relay and the fifth relay, respectively. The fourth relay and the fifth relay transmit the decoded audio signals to the two first input control terminals of the seventh relay. Finally, the signal is output to the output signal processing module for processing through the seventh relay.

[0057] Figure 2 The signal input terminals of the second relay and the third relay in the embodiments of the present application can be simultaneously connected to different microphones for testing. The model of the microphone is not limited.

[0058] The signal input terminals of the second relay and the third relay in the embodiments of the present application can be simultaneously connected to different microphones for testing. The model of the microphone is not limited.

[0059] ​For example, the second standard microphone is connected to the input decoding module 200, and the input decoding module 200 is connected to the output signal processing module 300, and the output signal processing module 300 is connected to the audio source generation module 500, and the audio source generation module 500 is connected to the loudspeaker, and the loudspeaker is connected to the first standard microphone and the second standard microphone, as shown in Figure 3 When the loudspeaker is tested and calibrated, the sixth relay and the seventh relay are set to be in the connected state, and the remaining relays are disconnected, the second standard microphone collects the audio signal emitted by the loudspeaker, the audio signal is transmitted to the seventh relay through the sixth relay, and the seventh relay transmits the audio signal output by the sixth relay to the output signal processing module.

[0060] Therefore, by supporting the connection of the to-be-tested microphone, the first standard microphone, and the second standard microphone, the input decoding module can realize self-test of the audio equipment test device, function test of the to-be-tested microphone, and function test of the loudspeaker.

[0061] In an embodiment, the output signal processing module 300 includes an automatic control amplification circuit, a band-pass filter circuit, and an alternating current effective value conversion circuit. The automatic control amplification circuit includes an amplifier and a first regulator. The band-pass filter circuit includes an active filter chip. The alternating current effective value conversion circuit includes an RMS-DC converter.

[0062] For example, the amplifier is U12, the model is AD8221, the first regulator is U11, the model is AD5144A, the active filter chip is U13, the model is MF10CCWM, and the RMS-DC converter is U14, the model is AD8436ARQZ, as shown in Figure 5 The input end (IN+, IN-) of U12 is used as the input end of the output signal processing module, as shown in Figure 6 The A3 and W3 pins of U11 are connected to the gain pin RG of U12, as shown in Figure 7 The S1A pin of U13 (i.e., the input end of the active filter chip) is connected to the amplifier, as shown in Figure 8 The IBUFIN+ pin of U14 (i.e., the input end of the RMS-DC converter) is connected to the active filter chip. In operation, the audio signal is input to U12, and U11 automatically controls U12 to perform signal amplification operation; the 7th pin of U12 outputs the audio signal to U13, U13 performs filtering operation on the audio signal and outputs to U14; U14 converts the audio signal to generate an effective signal, and the 15th pin of U14 transmits the effective signal to the MCU.

[0063] The audio source generation module 500 includes a wave type generator, a second regulator, and an audio source output circuit.

[0064] For example, the wave type generator is U16, the model is AD9833, and the second regulator is U11, the model is AD5144A, as shown in Figure 9As shown, the SYNC, SCLK and SDATA pins (i.e. control signal input terminals) of U16 are connected to the MCU. Referring to Figure 6 As shown, the A2 / A4 pins of U11 are connected to the wave generator output terminal. In operation, U16 generates audio signals of different waveforms according to the control signals input from the MCU and outputs the signals to the A2 / A4 pins of U11, which adjusts and controls the signals. The W2 / W4 pins of U11 output the signals to the sound source output circuit, which transmits the audio signals output from U11 to the loudspeaker.

[0065] The present application performs negative feedback adjustment on the loudspeaker sound source through the second regulator. In loudspeaker testing, this operation is crucial. It not only reduces distortion and improves signal-to-noise ratio, but also reduces the influence of the environment on the loudspeaker and improves stability.

[0066] In an embodiment, the audio device testing device further comprises a power supply provided with a plurality of voltage output terminals, which are respectively connected to the input decoding module, the output signal processing module, the sound source generating module and the MCU.

[0067] The working principle of the audio device testing device of the present application will be described below with reference to Figures 2-9 The working principle of the audio device testing device of the present application will be described below with reference to

[0068] The self-test process is as follows: a first standard microphone and a standard sound source are connected to the audio device testing device for self-test. The voltage supply end of the first standard microphone is connected to the output terminal of the first relay. The first standard microphone is turned on through the third relay and the decoding chip. The first channel signal output terminal of the decoding chip is turned on through the fourth relay, the seventh relay and the signal input terminal of the amplifier. The second channel signal output terminal of the decoding chip is turned on through the fifth relay, the seventh relay and the signal input terminal of the amplifier. The gain pin RG of the amplifier is connected to the first regulator. The signal output terminal of the amplifier is connected to the signal input terminal of the active filter chip. The signal output terminal of the active filter chip is connected to the signal input terminal of the RMS-DC converter. The signal input terminal of the RMS-DC converter is connected to the MCU. The test is started. The first standard microphone collects the fixed frequency signal of the standard sound source. The fixed frequency signal flows as follows: microphone -> third relay -> decoding chip -> fourth relay, fifth relay -> seventh relay -> U12 -> U13 -> U14 -> MCU.

[0069] The horn test procedure is as follows: the second standard microphone and the horn are connected for testing, the second standard microphone is connected to the signal input end of the amplifier through the sixth relay and the seventh relay, the gain pin RG of the amplifier is connected to the second regulator, the signal output end of the amplifier is connected to the signal input end of the active filter chip, the signal output end of the active filter chip is connected to the signal input end of the RMS-DC converter, the signal input end of the RMS-DC converter is connected to the MCU, the test is started, the second standard microphone collects the audio signal of the horn, and the audio signal is as follows: microphone-> sixth relay-> seventh relay-> U12-> U13-> U14-> MCU.

[0070] The microphone test procedure is as follows: the to-be-tested microphone is connected for testing, the to-be-tested microphone is powered through the first relay, the first channel signal output end and the second channel signal output end of the to-be-tested microphone are connected to the decoding chip through the second relay, the first channel signal output end of the decoding chip is connected to the signal input end of the amplifier through the fourth relay and the seventh relay, the second channel signal output end of the decoding chip is connected to the signal input end of the amplifier through the fifth relay and the seventh relay, the gain pin RG of the amplifier is connected to the first regulator, the signal output end of the amplifier is connected to the signal input end of the active filter chip, the signal output end of the active filter chip is connected to the signal input end of the RMS-DC converter, the signal input end of the RMS-DC converter is connected to the MCU, the test is started, the to-be-tested microphone collects the audio signal of the horn, and the audio signal is as follows: microphone-> second relay-> decoding chip-> fourth relay, fifth relay-> seventh relay-> U12-> U13-> U14-> MCU.

[0071] In an embodiment, the audio device testing device further comprises a power supply, and the power supply is provided with a plurality of voltage output ends, and the plurality of voltage output ends are respectively connected to the input decoding module, the output signal processing module, the audio source generating module and the MCU.

[0072] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An audio device testing apparatus, characterized in that, include: An input decoding module is provided, wherein the input terminal of the input decoding module is used to connect to the microphone under test, the first standard microphone, and the second standard microphone, and the input decoding module is used to convert the audio signals of the microphone under test and the first standard microphone into analog audio signals for output or to directly output the audio signal of the second standard microphone. An output signal processing module is provided, wherein the input terminal of the output signal processing module is connected to the output terminal of the input decoding module, and the output signal processing module is used to process the audio signal output by the input decoding module and output a valid signal. A sound source generation module, wherein the data output terminal of the sound source generation module is used to connect to the speaker under test; A microcontroller unit (MCU) is connected to the input terminal of the sound source generation module and the output terminal of the output signal processing module. The input decoding module, the output signal processing module, the sound source generation module, and the MCU are all integrated on the PCB board. The MCU is used to output control signals to the sound source generation module, and the sound source generation module is used to generate a sound source signal to be tested according to the control signals and output it to the speaker to be tested. The MCU is also used to calibrate the microphone under test and the speaker under test based on the valid signal.

2. The audio equipment testing apparatus according to claim 1, characterized in that, The input decoding module includes a signal switching circuit, a decoding chip, a fourth relay, and a fifth relay. The signal input terminals of the fourth relay and the fifth relay are respectively connected to the first channel output terminal and the second channel output terminal of the decoding chip. The signal output terminals of the fourth relay and the fifth relay are connected to the output signal processing module. The signal switching circuit is used to control the connection status between the decoding chip and the first standard microphone, the second standard microphone, and the microphone under test.

3. The audio equipment testing apparatus according to claim 2, characterized in that, The signal switching circuit includes a relay control subcircuit, a first microphone access subcircuit, and a second microphone access subcircuit. Multiple control input terminals of the relay control subcircuit are connected to the MCU, and multiple control output terminals of the relay control subcircuit are respectively connected to two control terminals of the first microphone access subcircuit, two control terminals of the second microphone access subcircuit, a common terminal of the fourth relay, and a common terminal of the fifth relay. The signal input terminal of the first microphone access subcircuit is connected to the first standard microphone and the microphone under test. The first microphone access subcircuit is used to output the audio signal of the first standard microphone to the decoding chip according to the control signal input from the relay control subcircuit. The signal input terminal of the second microphone access sub-circuit is connected to the second standard microphone. The second microphone access sub-circuit is used to directly output the audio signal of the second standard microphone according to the control signal input by the relay control sub-circuit.

4. The audio equipment testing apparatus according to claim 3, characterized in that, Each of the first microphone sub-circuits includes a first relay, a second relay, and a third relay. The first signal input terminal and the second signal input terminal of the second relay and the third relay are both used to connect to the first channel signal output terminal and the second channel signal output terminal of the microphone under test and the first standard microphone. The output terminal of the first relay is connected to the voltage power supply terminal of the microphone under test and the first standard microphone. The signal output terminal of the second relay and the third relay is connected to the input terminal of the decoding chip. The common terminal of the first relay, the second relay, and the third relay is connected to the control output terminal of the relay control sub-circuit one by one.

5. The audio equipment testing apparatus according to claim 3, characterized in that, The second microphone access sub-circuit includes a sixth relay and a seventh relay. The two first input control terminals of the seventh relay are respectively connected to the signal output terminals of the fourth relay and the fifth relay, and the second input control terminal of the seventh relay is connected to the output terminal of the sixth relay. The two first output control terminals and the second output control terminal of the seventh relay are all connected to the input terminal of the output signal processing module. The common terminal of the seventh relay is correspondingly connected to the control output terminal of the relay control sub-circuit. The signal input terminal of the sixth relay is used to connect to the signal output terminal of the second standard microphone, which is of a different type than the first standard microphone.

6. The audio equipment testing apparatus according to claim 1, characterized in that, The output signal processing module includes an automatic control amplifier circuit, a bandpass filter circuit, and an AC RMS conversion circuit. The signal input terminal of the automatic control amplifier circuit is connected to the output terminal of the input decoding module. The signal input terminal of the bandpass filter circuit is connected to the output terminal of the automatic control amplifier circuit. The signal input terminal of the AC RMS conversion circuit is connected to the output terminal of the bandpass filter circuit. The signal output terminal of the AC RMS conversion circuit is connected to the MCU.

7. The audio equipment testing apparatus according to claim 6, characterized in that, The automatic control amplifier circuit includes an amplifier and a first regulator. The signal input terminal of the amplifier is connected to the output terminal of the input decoding module, the signal output terminal of the amplifier is connected to the signal input terminal of the bandpass filter circuit, and the first regulator is connected to the gain adjustment pin of the amplifier.

8. The audio equipment testing apparatus according to claim 7, characterized in that, The bandpass filter circuit includes an active filter chip, and the AC RMS-DC converter includes an RMS-DC converter. The signal input terminal of the active filter chip is connected to the signal output terminal of the amplifier, the signal input terminal of the RMS-DC converter is connected to the signal output terminal of the active filter chip, and the signal output terminal of the RMS-DC converter is connected to the MCU. The active filter chip is model MF10CCWM, and the RMS-DC converter is model AD8436ARQZ.

9. The audio equipment testing apparatus according to claim 1, characterized in that, The sound source generation module includes a waveform generator, a second regulator, and a sound source output circuit. The signal output terminal of the waveform generator and the signal input terminal of the sound source output circuit are both connected to the second regulator. The control input terminals of the waveform generator and the second regulator are connected to the MCU. The waveform generator is used to generate an audio signal based on the sound source generation control signal from the control input terminal. The sound source output circuit is used to output the audio signal to a speaker. The waveform generator is model AD9833.

10. The audio equipment testing apparatus according to claim 1, characterized in that, The audio equipment testing device also includes a power supply with multiple voltage output terminals, which are respectively connected to the input decoding module, the output signal processing module, the sound source generation module, and the MCU.

Images