Method and system for obtaining a plurality of parameters of electro-acoustic product by adopting continuous logarithmic swept-frequency signal

A technology of sweeping frequency signals and electroacoustics, which is applied in the field of parameter measurement methods and measurement systems of electroacoustic devices, and can solve problems such as high requirements for test equipment and the environment, complex operation of test methods, and long time consumption

Active Publication Date: 2009-12-09
嘉兴中科声学科技有限公司
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Problems solved by technology

[0008] The present invention aims to solve the problem that the existing test method is complex in operation, takes a long time, or has high requirements on test equipment and environment, and is not suitable for use in production lines.

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  • Method and system for obtaining a plurality of parameters of electro-acoustic product by adopting continuous logarithmic swept-frequency signal

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Embodiment Construction

[0072] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0073] The invention uses the loudspeaker used in the car audio as the electro-acoustic device to be tested. The method for obtaining multiple parameters of an electroacoustic product by using continuous logarithmic sweep signals is realized in a test system composed of a PC, a power amplifier, a current measurement module, and a microphone (7). In order to simulate a free-field test environment, the microphone (7) has been installed in the anechoic box (6). A professional sound card is installed in the PC as a digital-to-analog and analog-to-digital conversion interface (2), and an analysis module (8) is run. The power amplifier is connected with the output of the professional sound card to provide enough power for the speaker for constant voltage output. After the instrument is calibrated, the magnitude of the voltage across the loudspeaker is consi...

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Abstract

The invention provides a method for rapidly measuring a plurality of parameters of an electro-acoustic product and also provides a test system realizing the method. The method comprises the following steps: adopting a continuous logarithmic swept-frequency signal to stimulate an electro-acoustic component and collecting an acoustic response signal transmitted by the electro-acoustic component to be tested and a current response signal flowing through the electro-acoustic component to be tested; obtaining a frequency response curve and a phase curve after the acoustic response signal is filtered by an inverse filter, and calculating and obtaining a harmonic distortion curve after time domain processing is carried out on the frequency response curve; calculating and obtaining an impedance curve after inverse filter and time domain processing are carried out on the current response signal; and further analyzing a result curve and obtaining results, such as sensitivity, polarity, rated impedance, linear parameters and the like. The test system comprises a test instrument, an amplifier, a current measurement module and a microphone.

Description

technical field [0001] The invention belongs to a parameter measurement method and a measurement system of an electroacoustic device, in particular to a method and a system for obtaining multiple parameters of an electroacoustic product by using a continuous logarithmic sweep signal. It can be widely used in the research and development of electroacoustic enterprises and the product quality inspection of production lines. Background technique [0002] Parameter testing of electro-acoustic products such as loudspeakers and receivers is usually essential in electro-acoustic research and development and product quality control. R&D personnel can understand the difference between trial products and design indicators through parameters such as frequency response, harmonic distortion, and impedance, while quality control personnel pay attention to whether the product meets the product threshold standard. Traditional testing instruments can only test one or two parameters, some pa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 韦峻峰温周斌冯海泓杨益陈友元张平
Owner 嘉兴中科声学科技有限公司
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