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Identification Method of Loudspeaker Nonlinear System

A nonlinear system and identification method technology, applied in the field of loudspeaker parameter measurement, can solve the problems of increased complexity and poor flexibility of the Volterra model, and achieve the effects of reducing influence, improving accuracy and simple method.

Active Publication Date: 2019-09-13
AAC TECH PTE LTD
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Problems solved by technology

[0005] 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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  • Identification Method of Loudspeaker Nonlinear System
  • Identification Method of Loudspeaker Nonlinear System
  • Identification Method of Loudspeaker Nonlinear System

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[0118] refer to Figure 5 to Figure 7 , Figure 5 shows the measured and impedance matching curves, Figure 6 Estimated nonlinear parameter curves are shown, including force factor Bl(x), stiffness coefficient k t (x) and force resistance R m (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, synchronously measure the voltage signal and current signal at both ends of the speaker system, 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.

[0119] Table 1 uses the linear...

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Abstract

The invention provides a speaker nonlinear system identification method, comprising the following steps: providing an amplified excitation signal to the speaker system to be tested; synchronously measuring voltage signals and current signals at both ends of the speaker system; obtaining linear parameters of the speaker system: According to the measured voltage signal and the measured current signal, under large signal conditions, calculate the impedance curve of the speaker system, and use the least square method to match the impedance curve to obtain the linear parameters of the speaker system; obtain the nonlinear parameters of the speaker system : Input the measured current signal into the lumped parameter model of the loudspeaker system to calculate the estimated voltage signal; compare the estimated voltage signal with the measured voltage signal, and calculate the voltage error signal between the two; calculate the voltage error signal In decoherence, the linear component in the voltage error signal is removed, and then according to the voltage error signal after decoherence, an adaptive iterative algorithm is used to obtain nonlinear parameters.

Description

[0001] 【Technical field】 [0002] The invention relates to a method for measuring loudspeaker parameters, in particular to an identification method for a loudspeaker nonlinear system. [0003] 【Background technique】 [0004] 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. [0005] The related art discloses a method of measuring loudspeaker parameters using a curren...

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Application Information

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Patent Type & Authority Patents(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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