A sound pressure test method and sound pressure test system
A pressure test, sound pressure value technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of affecting the sound pressure of the pressure field, large size of the test microphone, etc., to accurately test the sound pressure and frequency response. Curves, the effect of reducing the influence
Active Publication Date: 2019-04-30
QINGDAO GOERTEK
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However, during the test process, the test microphone diaphragm will move up and down with the change of sound pressure, which will cause the change of the pressure field volume. Due to the adiabatic process, the PV γ =const, so the volume change of the pressure field will affect the sound pressure in the pressure field, especially when the size of the test microphone is large and the volume of the pressure field is small, this effect is more obvious
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[0021] The core idea of the present invention is: the influence of the test microphone on the test pressure field is related to the size and shape of the confined space and the parameters of the film itself. The method provided by the invention is to inversely deduce the volume change caused by the microphone according to the parameters of the test microphone and the test results, and then correct and obtain a more accurate sound pressure value according to the relational formula between the volume of the pressure field and the sound pressure in the pressure field during the adiabatic process.
[0022] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] figure 1 The flow chart of the sound pressure testing method provided by the embodiment of the present invention. like figure 1 Sho...
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The invention discloses a sound pressure test method and a sound pressure test system. Later modifying compensation calculation is added by combining an actual test environment to modify a sound pressure value measured by a test machine. The method comprises the steps that a test microphone is placed in the pressure field of a device to be tested; the test microphone tests the sound pressure of the device to be tested at different frequencies to acquire original test data; the original test data are calculated to acquire a sound pressure test value; according to the parameters of the actual test environment, modifying calculation is carried out on the sound pressure test value; and the modified sound pressure value is used as the sound pressure test result of the device to be tested and is output. According to the invention, modifying calculation is carried out on the sound pressure value; the influence of the diaphragm vibration of the test microphone on test sound pressure is reduced; accurate test sound pressure and frequency response curve are acquired; and the method is suitable for testing a headphone, a receiver and the like, and is suitable for various test conditions.
Description
technical field [0001] The invention relates to acoustic testing under a pressure field, in particular to a sound pressure testing method and a sound pressure testing system. Background technique [0002] At present, the acoustic test environment of the equipment under test for earphones and receivers is a pressure field, and the frequency response curve of the equipment under test is obtained by testing the change of the sound pressure of the microphone under the pressure field. However, during the test, the test microphone diaphragm will move up and down with the change of the sound pressure, which will cause the change of the pressure field volume. Due to the adiabatic process, the PV γ =const, so the volume change of the pressure field will affect the sound pressure in the pressure field, especially when the size of the test microphone is large and the volume of the pressure field is small, this effect is more obvious. Contents of the invention [0003] In view of the...
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IPC IPC(8): G01H11/02
CPCG01H11/02
Inventor 张晓红
Owner QINGDAO GOERTEK