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Loudspeaker nonlinear system identification method

A technique of nonlinear system and identification method, applied in the field of loudspeaker parameter measurement, which can solve problems such as poor flexibility and increased complexity of Volterra model

Active Publication Date: 2016-11-02
AAC TECH PTE LTD
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Problems solved by technology

[0003] The related art discloses a method of measuring loudspeaker parameters using a current sensor and a laser sensor using a dual-frequency excitation signal and a large-signal Volterra model when the nonlinear order of the loudspeaker system is high (higher than 3rd order) , the complexity of the Volterra model is greatly increased, and the flexibility is poor

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  • Loudspeaker nonlinear system identification method

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[0113] refer to Figure 5 to Figure 7 , Figure 5 shows the measured and impedance matching curves, Image 6 Estimated nonlinear parameter curves are shown, including force factor Bl(x), stiffness coefficient k t (x) and force resistance Rm (v), Figure 7 When the effective voltage is 1v, the actual measured sound pressure total harmonic distortion (THD) and the simulated sound pressure THD curve using the estimated linear parameters and nonlinear parameters are shown. The diaphragm of this loudspeaker system is 1.6cm long and 0.9cm wide. Use pink noise as the excitation signal input in the speaker system, the excitation power is 0.15W, measure the voltage signal and current signal at both ends of the speaker system synchronously, and use the loudspeaker nonlinear system parameter identification method estimated by the present invention to estimate the speaker system Linear parameters and nonlinear parameters, as shown in the table below.

[0114] Table 1 uses the linear ...

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Abstract

The invention provides a loudspeaker nonlinear system identification method comprising the steps of providing an amplified excitation signal for a loudspeaker system to be tested; synchronizing a voltage signal and current signal on both ends of the loudspeaker system; acquiring a linear parameter of the loudspeaker system: according to the measured voltage signal and the measured current signal, computing the impedance curve of the loudspeaker system on a large signal condition, and matching the impedance curve by using a least square method so as to obtain the linear parameter of the loudspeaker system; acquiring the nonlinear parameter of the loudspeaker system: inputting the measured current signal into the lumped parameter model of the loudspeaker system to compute an estimated voltage signal; comparing the estimated voltage signal with the measured voltage signal and computing a voltage error signal between the estimated voltage signal with the measured voltage signal; de-correlating the voltage error signal in order remove the linear component in the voltage error signal, and acquiring the nonlinear parameter by an adaptive iteration algorithm according to the de-correlated voltage error signal.

Description

【Technical field】 [0001] The invention relates to a method for measuring loudspeaker parameters, in particular to an identification method for a loudspeaker nonlinear system. 【Background technique】 [0002] Micro speakers have the advantage of small size, so they have a wide range of applications in electronic devices such as smartphones and tablet computers. However, as the size decreases, the nonlinearity of the speaker system becomes more and more significant. Under large signal conditions, the sound emitted by the micro-speaker will produce obvious distortion. Establishing the nonlinear model of the micro-speaker system, and accurately estimating the linear and nonlinear parameters of the micro-speaker system under large signal conditions, and then predicting and compensating the nonlinear distortion of the speaker system, have attracted more and more attention. [0003] The related art discloses a method of measuring loudspeaker parameters using a current sensor and a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
CPCH04R29/003G01H11/06H04R3/007H04R29/001
Inventor 胡玉祥卢晶张姮李子
Owner AAC TECH PTE LTD
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