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Method utilizing laser sensor to measure speaker parameters and system

A technology of laser sensor and speaker, applied in the direction of electrical components, etc., can solve the problem of changing the normal working state of the speaker, and achieve the effect of meeting the test requirements

Active Publication Date: 2011-08-17
嘉兴中科声学科技有限公司
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Problems solved by technology

Some scholars have also proposed the method of changing the balance position of the diaphragm by using the cavity and the air pump, but the required equipment is relatively special, and there is also the problem of changing the normal working state of the speaker.

Method used

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  • Method utilizing laser sensor to measure speaker parameters and system
  • Method utilizing laser sensor to measure speaker parameters and system

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] As shown in the figure, the method for measuring loudspeaker parameters using a laser sensor proposed by the present invention includes the following steps:

[0047] 1) The excitation signal generation module 1 set in the computer 7 generates an excitation signal, the excitation signal is a digital signal, and the digital signal is converted into an analog signal by the digital-analog-to-analog conversion module 8 and then output;

[0048] 2) The power amplifier 9 amplifies the analog signal output by the digital-to-analog conversion module 8 and outputs it to the device under test 13;

[0049] 3) The laser sensor 10 measures the displacement response signal of the device under test 13, the current sensor 11 measures the current response signal flowing through the device under test, and the obtained current signal and displacement signal are inpu...

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Abstract

The invention provides a method utilizing a laser displacement sensor to measure speaker parameter and a testing system for realizing the method. The method adopts stepping swept-frequency signals to stimulate a device to be measured, and simultaneously measures displacement response signals of a vibrating diaphragm of the device to be measured and current response signals flowing over the device to be measured. The signals are imported into a linear model and a large signal Volterra model of a speaker, and linear parameters and nonlinear parameters of the speaker are obtained through system identification. As the linear parameters and the nonlinear parameters of the speaker can show operating characteristics of the speaker under different amplitude input, the method can not only be applied to the design verification and the product quality detection of the speaker, but also be applied to the tone quality improvement of the speaker products.

Description

technical field [0001] The invention belongs to a parameter measurement method and a measurement system of a loudspeaker, specifically a method and a system for obtaining multiple parameters of an electroacoustic product by systematically identifying the vibration amplitude of a diaphragm and a load current. It can be widely used in speaker research and development and product quality inspection of electro-acoustic enterprises. Background technique [0002] Significance of loudspeaker parameter measurement: [0003] Loudspeaker parameters play an important role in the design, manufacture, and quality control of loudspeakers. Since 1970, A. N. Thiele and R. H. Small of Australia proposed the T / S parameters of the loudspeaker system, which made it possible to realize the design of the loudspeaker system through the filter synthesis method. The small-signal parameters are measured under the condition that the small-signal excitation and the distortion in the system output can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 韦峻峰冯海泓赵亮徐建锋严莎莎
Owner 嘉兴中科声学科技有限公司
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