A method for judging the starting point of the response signal time of an electroacoustic product detection system
A detection system and response signal technology, applied in the direction of electrical components, etc., can solve problems such as inability to ensure accurate capture of response signals, reduce test efficiency, increase test hardware complexity, etc., achieve simplified software processing flow, simple calculation, and increased system Effects of Computational Amount and Storage Amount
Active Publication Date: 2020-05-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
Adding agreed signals such as single frequency to realize the judgment of the starting point of time increases the test time and calculation overhead, and reduces the test efficiency; at the same time, electro-acoustic devices such as speakers are essentially nonlinear transduction systems, and there is a time-delay response to frequency signals, and the signal frequencies are different. The time lag caused is also different, and the start time of the response signal cannot be accurately judged based on the single-frequency signal
The use of hardware circuits to trigger signal acquisition increases the complexity of the test hardware, introduces the response delay of the trigger circuit and the acquisition circuit, and the judgment accuracy of the time starting point cannot be guaranteed
It can be seen that the existing method for judging the starting point of time cannot guarantee the accurate capture of the response signal, and an appropriate processing method must be used to judge the starting point of the response signal
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[0035] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0036] Such as figure 1 As shown, a method for judging the starting point of the response signal time of an electroacoustic product detection system includes the following steps:
[0037] (1) Send the digital excitation signal s(n) to stimulate the receiver, and set the sampling rate of the digital excitation signal s(n) to f s , the duration is T, and the total number of points is N; the digital excitation signal is shared with the electro-acoustic product performance parameter test signal, specifically, sine signal, white noise signal, pulse signal, linear sine frequency sweep signal, logarithmic sine frequency sweep signal, One of exponential sine sweep signals, longest sequence pseudorandom noise. The above 7 kinds of signals are the national standards for electroacoustic testing (such as: na...
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The invention relates to the technical field of electroacoustic product parameter detection, in particular to a method for judging a response signal time starting point of an electroacoustic product detection system. A response signal is windowed, and the number of movements of a rectangular window correspondingly is searched for when a windowing result reaches a maximum value to obtain the time starting point of a current response signal and an acoustic response signal. The method achieves the time starting point judgment of the response signal of an electroacoustic product through software sliding window processing, can accurately obtain the time starting point, the precision can be selected according to the actual situation by adjusting a sliding step length, and the method is suitablefor an electrosonic product production line; the time starting point of the current response signal and the acoustic response signal is judged by the same method, if acoustic propagation delay is ignored, it is only necessary to calculate the current response time starting point, the software processing flow is simplified, the calculation of the method is simple, practical, effective and easy to implement, and the amount of system calculation and storage is not significantly increased.
Description
technical field [0001] The invention relates to the technical field of electroacoustic product parameter detection, in particular to a method for judging the time origin of a response signal of an electroacoustic product detection system. Background technique [0002] Parameter testing of electroacoustic products such as loudspeakers, microphones, microphones, and microphones is an indispensable technical guarantee for product development, production, and quality control. Through parameter detection, R&D personnel can understand the design shortcomings, and quality control can find problems in the production process and adjust the production process. [0003] The parameter detection means of existing electro-acoustic products all is to send test signal to excite the receiver, and test product parameters by the current response and acoustic response of the receiver (Qina, Mencius Hou. Principles of Audio Acoustic Measurement Technology [M]. Beijing: National Defense Industry ...
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IPC IPC(8): H04R29/00
CPCH04R29/00
Inventor 苏海涛桂文华徐翠锋胡鸿志郭庆
Owner GUILIN UNIV OF ELECTRONIC TECH