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Device and method for inhibition of second resonance mode of vibrating diaphragm

A resonant mode and adder technology, applied in the direction of frequency response correction, etc., can solve problems such as the pitch diameter of the diaphragm, and achieve the effect of enhancing power bearing capacity and improving performance

Active Publication Date: 2013-12-11
AAC TECH PTE LTD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the pitch diameter of the diaphragm in the low frequency range, and propose a device and method for suppressing the second resonance mode of the diaphragm

Method used

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  • Device and method for inhibition of second resonance mode of vibrating diaphragm
  • Device and method for inhibition of second resonance mode of vibrating diaphragm
  • Device and method for inhibition of second resonance mode of vibrating diaphragm

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Usually, the pitch diameter of the diaphragm occurs at the natural low-frequency resonance frequency. To avoid this phenomenon, it is necessary to extract the signal at the natural low-frequency resonance frequency from the audio signal. The calculation method of the natural low-frequency resonance frequency is as follows:

[0023] Assuming a thin film, in the ideal state of ignoring the influence of the medium on the vibration of the film, the derivation of its vibration frequency is as follows:

[0024] T is the traction force on the straight line per unit length, η is the vertical displacement of a point on the diaphragm away from the equilibrium position, σ is the mass of the film per unit area, and C is the propagation speed of the film vibration, then

[0025] c = T σ . ...

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Abstract

The invention relates to a device and a method for inhibition of a second resonance mode of a vibrating diaphragm. The method is realized through a psychoacoustic phenomenon of so-called virtual pitch or fundamental tone missing, and comprises the following steps: extracting signals in a position with a frequency of resonance of an inherent low frequency, generating a harmonic wave of signals in the frequency band, and sending a harmonic signal, thereby achieving a psychological sense similar to a psychological sense to signals in the original frequency band. Simultaneously, the invention can prevent the damage to the vibrating diaphragm due to the high vibrating amplitude of the vibrating diaphragm when the signals are strong in the position with the frequency of resonance of the inherent low frequency. Since the harmonic wave of the tone is applied to substitute tones of all frequencies when the audio signal appears and no micro speaker is used, the invention enhances the power bearing capacity of the vibrating diaphragm and effectively improves the performance of the sounding device.

Description

【Technical field】 [0001] The invention relates to the field of diaphragm vibration of a sound generator, in particular to a method and a device for suppressing the second resonance mode of the diaphragm in an electroacoustic energy sound generating device. 【Background technique】 [0002] The effective frequency range of a general cone speaker is from about 60-70Hz to 6000-7000Hz, and its frequency response curve also has a large unevenness of about 12-15dB. In this range, the vibration amplitude and phase of each point on the diaphragm are consistent. Are the same. However, at the inherent low-frequency resonance frequency, the diaphragm will perform split vibration, and the phenomenon of pitch diameter or pitch circle will appear, so that the vibration of the diaphragm is divided into at least two parts, and the phase of the vibration is opposite, which will make the diaphragm in a normal vibration state. Cause distortion and poor pure tone, and when the power is high, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/04
Inventor 周荣冠李林珍
Owner AAC TECH PTE LTD
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