Acoustic-electric conversion device for testing sensitivity of microphone and loudspeaker

Abstract

The utility model relates to the technical field of audio equipment testing, in particular to an acoustic-electric conversion device for testing the sensitivity of a microphone and a loudspeaker, which comprises a base, a display screen arranged on the front side of the base, a sound wave generator arranged on one side of the base, and a microphone testing unit arranged on the other side of the base. The microphone test unit is used for converting a sound signal acquired by the detected microphone into an electric signal; a standard microphone is fixedly arranged in the microphone test unit on the base, a loudspeaker test unit is arranged beside the sound wave generator on the base, and the loudspeaker test unit is used for outputting a standard electric signal to a detected loudspeaker and receiving feedback sound waves through the standard microphone; a data analysis module is further arranged in the base, the data analysis module is electrically connected with the display screen, the sound wave generator, the microphone testing unit, the standard microphone and the loudspeaker testing unit, and the data analysis module is used for calculating sensitivity, total harmonic distortion and a frequency response curve in real time and displaying the sensitivity, the total harmonic distortion and the frequency response curve on the display screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of audio equipment test, specifically relates to the sound -electric conversion device for testing microphone and loudspeaker sensitivity. BACKGROUND

[0002] The microphone sensitivity refers to the ability of microphone to capture sound, and the sensitivity of microphone can be tested by speaking at different distances and volumes, and the audio quality under different conditions is recorded to ensure that the microphone can work normally under various conditions. The existing microphone sensitivity measurement is usually carried out at 94dB sound pressure level or 1Pa pressure through 1kHz sine wave, and the amplitude of analog or digital output signal generated by the microphone under this specific input excitation condition is a key index for evaluating the microphone sensitivity, but the test precision is insufficient for special low-frequency or high-frequency signals, the dynamic range is limited, the test is not comprehensive, there is no specially adapted fixed test equipment, generally only the positive and negative poles of the microphone are connected by wires, the influence of environment is large, and the efficiency is not high.

[0003] And the loudspeaker sensitivity test has static test and dynamic test: the static test refers to inputting a single-frequency signal to the loudspeaker through a signal generator, measuring the output power and input power of the signal through a test instrument to calculate the sensitivity of the loudspeaker, and the dynamic test uses a music signal as an input signal, measures the output power and audio input power of the signal through a test instrument, and calculates the audio sensitivity of the loudspeaker. That is, the existing test instrument needs to measure the output power and input power, and the sensor used has high cost and complicated operation, and therefore independent devices need to be used to test the microphone and the loudspeaker respectively, and the electroacoustic conversion performance cannot be tested reversely. UTILITY MODEL CONTENTS

[0004] In order to solve the problems existing in the prior art, the utility model aims at providing a sound -electric conversion device for testing microphone and loudspeaker sensitivity. The utility model oppositely arranges the sound emitting part and the sound receiving part, can realize the sensitivity test integration of microphone and loudspeaker through circuit switching, is more convenient to operate, can improve the test efficiency through real-time data analysis and comparison.

[0005] The utility model discloses a sound -electricity conversion device for testing microphone and loudspeaker sensitivity, including base, the base front side is equipped with display screen, one side on the base is equipped with sound wave generator, the other side on the base is equipped with microphone test unit, the microphone test unit is used for converting the sound signal of the microphone gathering of being detected into electric signal, the microphone test unit in the microphone test unit in the base is fixed with standard microphone, the side of the base is equipped with loudspeaker test unit in the side of the sound wave generator, the loudspeaker test unit is used for outputting standard electric signal to the loudspeaker of being detected and receiving feedback sound wave through the standard microphone, the data analysis module of still being equipped with in the base, the data analysis module is electrically connected with display screen, sound wave generator, microphone test unit, standard microphone and loudspeaker test unit respectively, and the data analysis module is used for real -time calculation sensitivity, total harmonic distortion and frequency response curve and shows on the display screen.

[0006] In one embodiment, the microphone test unit includes an array of connection slots and a rack for mounting a single microphone, each connection slot is provided with an indicator light.

[0007] In one embodiment, the base is provided with a signal processing unit, the signal processing unit is electrically connected with the data analysis module, and the signal processing unit includes a digital filter, a dynamic gain control module and an FFT spectrum analysis chip.

[0008] In one embodiment, the base is further provided with an ambient noise sensor, and the ambient noise sensor is electrically connected with the data analysis module and the signal processing unit respectively.

[0009] In one embodiment, the sound wave generator is connected to the upper surface of the base through a sliding block, and the sliding block moves the sound wave generator closer to or further away from the microphone test unit.

[0010] In one embodiment, the sound wave generator includes a programmable DSP chip and is used to generate a custom signal waveform.

[0011] In one embodiment, the base is provided with an interface module on the side, the interface module is electrically connected with the data analysis module, and the interface module is used for USB or Bluetooth data transmission and PC software control.

[0012] In one embodiment, the base is provided with a control panel below the display screen.

[0013] Compared with the prior art, the utility model technical scheme has the beneficial effects of:

[0014] The utility model discloses a two-way test integration, the sound production part, namely sound wave generator and loudspeaker test unit, with the radio part, namely microphone test unit and standard microphone, comprehensive relative setting can realize the sensitivity test integration of microphone and loudspeaker through circuit switching, and the operation is more convenient, can further pass through real-time data analysis and contrast, improve the test efficiency.

[0015] And the utility model still is provided with the function based on environmental noise sensor dynamic adjustment test signal intensity, ensure the result reliability, and can connect multiple measured equipment simultaneously, such as array microphone, through adjusting the different distance and volume of sound production part, improve batch detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the utility model;

[0017] Figure 2 It is the module connection schematic diagram of the utility model.

[0018] The figure mark explanation: 1 - base, 2 - display screen, 3 - sound wave generator, 4 - microphone test unit, 41 - connecting groove, 42 - frame body, 43 - pilot lamp, 5 - standard microphone, 6 - loudspeaker test unit, 7 - data analysis module, 8 - signal processing unit, 9 - environmental noise sensor, 10 - interface module, 11 - control panel. DETAILED DESCRIPTION

[0019] The drawings are only for example description, and can not be understood as the limitation of the patent of the utility model;In order to better illustrate the embodiment, some components of the drawings can be omitted, enlarged or reduced, and do not represent the size of actual product;For those skilled in the art, it is understandable that some well-known structures in the drawings and their description can be omitted.

[0020] In the description of the utility model, it is necessary to explain that, unless another explicit provision and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can say the intercommunication of two elements inside. For ordinary skilled in the art, the above-mentioned term can be understood in the specific meaning of the utility model according to specific circumstances. The technical scheme of the utility model is further explained below in connection with the drawings and examples.

[0021] For example, Figure 1 And Figure 2The utility model discloses a sound -electric conversion device for testing microphone and loudspeaker sensitivity, including base 1, the front side of base 1 is equipped with display screen 2, one side on base 1 is equipped with sound wave generator 3, the other side on base 1 is equipped with microphone test unit 4, and microphone test unit 4 is used to convert the sound signal of the microphone gathered for being detected into electric signal, the fixed standard microphone 5 of microphone test unit 4 is located in base 1, and the lateral of sound wave generator 3 on base 1 is equipped with loudspeaker test unit 6, and loudspeaker test unit 6 is used to output standard electric signal to the loudspeaker of being detected and receive feedback sound wave through standard microphone 5, base 1 still is equipped with data analysis module 7 in, and data analysis module 7 is electrically connected with display screen 2, sound wave generator 3, microphone test unit 4, standard microphone 5 and loudspeaker test unit 6 respectively, and data analysis module 7 is used to calculate sensitivity, total harmonic distortion and frequency response curve in real time and show on display screen 2. The utility model integrates two -way test, and the sound -producing part, i.e. sound wave generator 3 and loudspeaker test unit 6, and the radio part, i.e. microphone test unit 4 and standard microphone 5, are relatively arranged comprehensively, so that the sensitivity test integration of microphone and loudspeaker can be realized through circuit switching, and the operation is more convenient, and the test efficiency can be further improved through the real -time data analysis and comparison of data analysis module 7.

[0022] Specifically, the microphone test unit 4 includes an array of connection slots 41 and a rack 42 for mounting individual microphones, each connection slot 41 is provided with an indicator light 43. When the microphone needs to be tested, the array microphone can be placed in the corresponding connection slot 41 in turn, or the single microphone is connected to the positive and negative electrodes and placed on the rack 42, then the test of the microphone is started, the sound wave generator 3 can support signal modes such as sine wave and white noise, generally 94dB sound pressure level or 1Pa pressure, through 1kHz sine wave. Because the sound wave generator 3 can be connected to the upper surface of the base 1 through the sliding block, the sliding block makes the sound wave generator 3 close to or away from the microphone test unit 4, so as to adjust the distance between the sound wave generator 3 and the tested microphone as needed, so as to test the sensitivity of the microphone at different distances and volumes. Moreover, the sound wave generator 3 includes a programmable DSP chip, which has the ability to process digital signals to generate custom signal waveforms. In addition to the above standard sine wave test, different electrical signals can be generated to produce varying test sounds for comprehensive sensitivity testing of the microphone. During the process, the tested microphone converts the collected sound signal into an electrical signal, and the data analysis module 7 calculates the sensitivity of the microphone in real time through the change of the electrical signal and displays it on the display screen 2. More specifically, the base 1 is provided with a signal processing unit 8, the signal processing unit 8 is electrically connected with the data analysis module 7, the signal processing unit 8 includes a digital filter to extract the amplitude of the electrical signal of the tested microphone, and then calculate the sensitivity, and the data analysis module 7 can compare with the preset threshold value, or compared with the data of the standard microphone 5, mark the unqualified products, especially for batch testing of array microphones, the unqualified products will light up the corresponding indicator light 43, so as to facilitate identification.

[0023] For the sensitivity test of the loudspeaker, the tested loudspeaker is placed at the loudspeaker test unit 6 and connected to the positive and negative electrodes, the loudspeaker test unit 6 inputs a sine signal of, for example, 1W electrical power to it, and the standard microphone 5 receives the feedback sound wave. Specifically, the signal processing unit 8 also includes an FFT spectrum analysis chip to analyze the harmonic components, and the data analysis module 7 calculates the sensitivity, total harmonic distortion (THD) value and frequency response curve in real time and displays them on the display screen 2.

[0024] In one embodiment, the base 1 is also provided with an environmental noise sensor 9 to adapt to the sensitivity test of the microphone and the loudspeaker in different environments, the environmental noise sensor 9 is electrically connected with the data analysis module 7 and the signal processing unit 8 respectively, and the signal processing unit 8 also includes a dynamic gain control module, which adjusts or compensates the output of the electrical signal in real time through the noise volume detected by the environmental noise sensor 9, so as to change the corresponding error range in the calculation of the data analysis module 7.

[0025] In addition, the base 1 side is provided with an interface module 10, the interface module 10 is electrically connected with the data analysis module 7, the interface module 10 can be controlled by USB or Bluetooth data transmission connection host computer software etc., can be combined according to historical database etc. Further optimize test parameters. And the base 1 front side corresponds to the display screen 2 below is equipped with control panel 11 to carry out man-machine interaction. The utility model discloses the whole through modular design realizes the integration of microphone and loudspeaker sensitivity test, possesses environmental self-adapting, multi-channel parallel processing capacity, significantly improves test efficiency and precision.

[0026] In the description of the present application, it is understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, in the absence of the opposite description, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0027] In the drawings, the description of the position relationship is only for example, and cannot be understood as a limitation on the patent; Obviously, the above-mentioned embodiments of the utility model are only examples for clearly illustrating the utility model, and not limit the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or changes can be made. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. An acousto-electric conversion device for testing the sensitivity of microphones and loudspeakers, comprising a base (1) provided with a display screen (2) on the front side, characterized in that, One side of the base (1) is provided with a sound wave generator (3), and the other side of the base (1) is provided with a microphone test unit (4) for converting the sound signal collected by the detected microphone into an electrical signal; a standard microphone (5) is fixed in the microphone test unit (4) on the base (1); a horn test unit (6) is arranged beside the sound wave generator (3) on the base (1), and the horn test unit (6) is used for outputting a standard electrical signal to the detected horn and receiving feedback sound waves through the standard microphone (5); the base (1) is also provided with a data analysis module (7), and the data analysis module (7) is electrically connected with the display screen (2), the sound wave generator (3), the microphone test unit (4), the standard microphone (5) and the horn test unit (6), respectively; the data analysis module (7) is used for real-time calculation of sensitivity, total harmonic distortion and frequency response curve and display on the display screen (2).

2. The acoustical to electrical conversion device for testing microphone and speaker sensitivity of claim 1, wherein, The microphone test unit (4) comprises arrayed connecting grooves (41) and a rack (42) for erecting a single microphone, and each connecting groove (41) is provided with an indicating lamp (43).

3. The acoustical to electrical conversion device for testing microphone and speaker sensitivity of claim 1, wherein, The base (1) is provided with a signal processing unit (8), and the signal processing unit (8) is electrically connected with the data analysis module (7); the signal processing unit (8) comprises a digital filter, a dynamic gain control module and an FFT spectrum analysis chip.

4. The acoustical to electrical transducer device for testing microphone and speaker sensitivity of claim 3, wherein, The base (1) is also provided with an environmental noise sensor (9), and the environmental noise sensor (9) is electrically connected with the data analysis module (7) and the signal processing unit (8), respectively.

5. The acoustical to electrical transducer device for testing microphone and speaker sensitivity of claim 1, wherein, The sound wave generator (3) is slidably connected with the upper surface of the base (1) through a sliding block, and the sliding block makes the sound wave generator (3) close to or away from the microphone test unit (4).

6. The acoustical to electrical transducer device for testing microphone and speaker sensitivity of claim 5, wherein, The sound wave generator (3) comprises a programmable DSP chip and is used for generating a custom signal waveform.

7. The acoustical to electrical conversion device for testing microphone and speaker sensitivity according to any one of claims 1-6, wherein, The base (1) is provided with an interface module (10) on the side, and the interface module (10) is electrically connected with the data analysis module (7); the interface module (10) is used for USB or Bluetooth data transmission and PC software control.

8. The acoustical to electrical transducer device for testing microphone and speaker sensitivity of claim 7, wherein, The base (1) is provided with a control panel (11) below the display screen (2) on the front side.

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