Microphone sensitivity test tool and system

Abstract

The invention discloses a microphone sensitivity test tool and system. The tool comprises a test chamber, a loudspeaker and a collecting board provided with a probe, wherein the test chamber is divided by a support baffle into a sound chamber and an operation chamber, and the loudspeaker is mounted in the sound chamber; the support baffle comprises a baffle body as well as a microphone accommodating area, a sound making hole and a sound conducting channel which are formed in the baffle body, the sound making hole and the sound conducting channel are led to the microphone accommodating area and the operation chamber from the sound chamber respectively, and the sound conducting channel is located on the periphery of the microphone accommodating area; an operation port opposite to the microphone accommodating area is formed in the operation chamber and covered by the collecting board, and the probe extends into the operation chamber. With the adoption of the tool and the system, two kinds of microphone test tools are unified, the operation cost of test lines is saved, and the accuracy and the stability of test results are also improved.

Description

technical field [0001] The invention relates to the technical field of electroacoustic product testing, in particular to a microphone sensitivity testing tool for testing microphone sensitivity and a microphone sensitivity testing system provided with the microphone sensitivity testing tool. Background technique [0002] Microphone sensitivity refers to the size of the electrical signal output by the microphone under the action of a certain intensity of sound. The higher the sensitivity, the higher the acoustic-electric conversion efficiency of the microphone and the more sensitive the response to weak sound signals. Microphone sensitivity can be characterized by absolute value, which can be equal to the output voltage value (dBV) when the microphone output terminal feeds a sound pressure of 1Pa (94dB) at the microphone input terminal, or it can be characterized by relative value. Specifically, it can be defined that the microphone output terminal is in the microphone When t...

AI Technical Summary

Problems solved by technology

[0006] Since the above two types of test tools have different structures, in actual operation, it is necessary to configure two different test lines to test the sensitivity of the two types of microphones, which will not only increase the cost of tooling but also increase labor costs

In addition, the above-mentioned second type of test tool also has the problem of unstable test results for the sensitivity test of small microphones, which is specifically reflected in: because the distance between the pads 21b of the tested microphone 2b is very small, and the sound hole 23b is located on the pad Therefore, the sound hole 133b opened on the acquisition board 3b can only be very small, which leads to whether the alignment of the sound hole 23b and the sound hole 133b during the test will have a greater impact on the test resu...

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