Title: Differential reverse noise control system
Application Number: 01102324 Application Date: 2001.02.02
Publication Number: 1368834 Publication Date: 2002.09.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04R5/00
Applicant(s) Name: Xu Guangzhi Address:
Inventor(s) Name:
Attorney & Agent: zheng yongkang
Abstract:
     A differential antiphase noise control system contains a microphone connecting with preequivalent amplifing circuit which connects to a phase amplifing circuit and a phase-shifting amplifing circuit at the same time. The phases of the two are at an angle of 90 degrees and connected to a variable resistor of adjustable vector gain and signal-amplificed power amplifier and to different coils of dual voice coil micrpohone separately at last to improve the efficiency of acoustic output to ensure the stability of noise control to solve the problem of noise.
Time: 9
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