Loudspeaker nonlinear parameter testing device system and testing method

Abstract

The application provides a loudspeaker nonlinear parameter testing device system which comprises a direct current offset signal output device, a laser distance measuring instrument and a loudspeaker testing system. The application further discloses a loudspeaker nonlinear parameter testing method which comprises the steps that: the direct current offset signal output device applies a direct current offset voltage signal to a loudspeaker to be tested; the laser distance measuring instrument measures an offset displacement of a loudspeaker voice coil; under a condition that values of direct current offset voltage signals at both ends of the loudspeaker to be tested are kept unchanged, an impedance curve and a displacement-voltage transfer function curve of the loudspeaker are acquired by the loudspeaker testing system; a value of each nonlinear parameter of the loudspeaker in a state that the voice coil is offset is calculated out; and the steps above are repeated to acquire a nonlinear curve of each nonlinear parameter. According to the loudspeaker nonlinear parameter testing device system and testing method provided by the application, the loudspeaker is directly tested by equipment, such as the loudspeaker testing system, the laser distance measuring instrument and the like, and the nonlinear parameters of the loudspeaker are directly acquired, so that accuracy of measured data is effectively improved.

Description

【Technical field】 [0001] The present application relates to the technical field of loudspeaker nonlinear parameter measurement, in particular to a loudspeaker nonlinear parameter testing device and testing method. 【Background technique】 [0002] With the increasingly high quality requirements for speaker products in the market, more and more attention has been paid to the nonlinear analysis of speaker unit vibration. At present, the existing technology generally uses the indirect test method to analyze the nonlinear problem of speaker vibration, that is, through prior construction A loudspeaker circuit model, and then use the loudspeaker analyzer to test and get the relevant loudspeaker nonlinear parameter values ​​through the method of adaptive fitting operation. Since the loudspeaker circuit model is tested to indirectly simulate the loudspeaker nonlinear parameters, The accuracy is low, which is not conducive to the research and development work of practitioners. 【Conte...

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Problems solved by technology

[0002] With the increasingly high quality requirements for speaker products in the market, more and more attention has been paid to the nonlinear analysis of speaker unit vibration. At present, the existing technology generally uses the indirect test method to analyze the nonlinear problem of speaker vibration, that is, through prior construction A loudspeaker circuit model, and then use the speaker analyzer to test and get the related loudspeaker nonlinear parameter value through the method of adaptive fitting operation. Since the loudspeaker circuit model is tested to indirectly simulate the loudspeaker nonlinear parameters, The accuracy is low, which is not conducive to the research and development work of practitioners

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