Method for measuring non-linear parameters of speaker unit based on system identification

A system identification and parameter measurement technology, applied in the direction of electrical components, etc., can solve problems such as assembly difficulties, high airtightness requirements of airtight boxes, and difficulty in obtaining voice coil displacement, etc., and achieve the effect of saving costs
CN1761366AInactive Publication Date: 2006-04-19NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV
Publication Date
2006-04-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The method is applicable to conventional sound-frequency measuring meter. Feeding-in an adjustable DC current shifts the voice coil a certain displacement from equilibrium position. Under different displacements of the coil, using conventional sound-frequency measuring meter measures characteristic of electrical impedance of speaker unit. Based on model of nonlinear electrical impedance, using technique of system identification obtains nonlinear parameters of speaker unit. The said measurement of nonlinear parameter is related to measuring non-linear force factor, non-linear equivalent force and non-linear inductance of voice coil. Using conventional sound-frequency measuring meter, the invention can measure curve of electrical impedance of speaker unit, and caries out system identification for measured impedance curve of speaker unit.
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Description

1. Technical field

[0001] The invention relates to the measurement of the nonlinear parameters related to the displacement of the voice coil of the loudspeaker unit, including the measurement of the nonlinear force factor, the nonlinear equivalent compliance and the nonlinear voice coil inductance. That is, the electrical impedance curve of the speaker unit is measured under different voice coil displacements, and according to the established nonlinear electrical impedance model of the speaker unit, the measured electrical impedance curve is systematically identified to obtain the nonlinear parameters to be measured. 2. Background technology

[0002] <1> The significance of measuring the nonlinear parameters of the loudspeaker unit

[0003] So far, the linear loudspeaker unit model is still widely used in the design and simulation of loudspeaker units and their systems. The linear loudspeaker unit model ignores the variation of each parameter with the displacement of ...

Claims

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