Noise cancellation system

Details Noise cancellation system Noise cancellation system

Filed on

1996-07-24

Date issued

2000-03-21

Examiner

Lee, Ping

Patent Class

Electrical audio signal processing systems and devices

SubClass

Acoustical noise or sound cancellation

SubSubClass

Adjacent ear

Other Related Categories

381 7111, 381 72, A61F 1106

Type

Patent

Status

active

Patent number

060411260

Description

ABSTRACT:
A noise controlled type handset processes the output of non-directional noise detector installed outside of the handset by a first adaptive filter, delivers a control sound from a control speaker, controls the first adaptive filter so that the output of an error detector near the ear may be small, simultaneously processes the noise detection signal in a second adaptive filter, subtracts from the noise signal mixing into a bi-directional talking microphone, and controls the second adaptive filter so that the subtraction signal may be small, thereby taking back the signal of voice only by reducing noise by delivering through the speaker, and sending a transmission output at the same time.

REFERENCES:
patent: 4953217 (1990-08-01), Twiney et al.
patent: 5182774 (1993-01-01), Bourk
patent: 5251263 (1993-10-01), Andrea et al.
patent: 5384843 (1995-01-01), Masuda et al.
patent: 5473702 (1995-12-01), Yoshida et al.
patent: 5481615 (1996-01-01), Eatwell et al.

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