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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

Inactive Publication Date: 2006-04-19
NANJING UNIV
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Problems solved by technology

[0012] The limitation of this method is that the airtightness of the airtight box is very high, which brings great difficulties to the assembly, and the displacement of the voice coil is not easy to obtain

Method used

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

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specific Embodiment

[0032] The present invention has actually measured the non-linear parameters of two loudspeaker units of different sizes, the diameter of unit a is 10cm, and the diameter of unit b is 16cm. The measurement block diagram is as follows figure 1 As shown, the adjustable DC source is used to provide different DC currents to the speaker unit, so that the voice coil deviates from the equilibrium position with different displacements. The DC current fed to the speaker unit and the displacement of the voice coil are shown in Table 1 and Table 2. Measure the electrical impedance of the speaker unit with a conventional audio measuring instrument with the function of measuring the electrical impedance of the speaker unit, and send the measurement results to the computer, according to figure 2 The nonlinear electrical impedance model of the model, using the system identification technology to obtain each parameter in the model: the nonlinear force factor Bl(x) of the loudspeaker unit, the...

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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.

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 ...

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Application Information

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IPC IPC(8): H04R29/00
Inventor 沈勇徐小兵邬宁
Owner NANJING UNIV
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