Method and apparatus for canceling tone signal noise generated w

Details Method and apparatus for canceling tone signal noise generated w Method and apparatus for canceling tone signal noise generated w

1996-05-31

1999-11-09

Le, N.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379392, 379420, 379421, 379156, H04M 100

Patent

active

059828803

ABSTRACT:
A technique for eliminating tone signal noise generated using a speakerphone, in which the communication path of a microphone is interrupted when a key is pressed, and then the communication path of the microphone is linked only after a constant time period after the key has been released, thereby eliminating the noise input through the microphone during usage of the speakerphone.

REFERENCES:
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patent: 4406926 (1983-09-01), Duncun
patent: 4442322 (1984-04-01), Grnatland
patent: 4467140 (1984-08-01), Fathauer et al.
patent: 4472601 (1984-09-01), Wilson
patent: 4496799 (1985-01-01), Kingen et al.
patent: 4907258 (1990-03-01), Kamimoto
patent: 5073923 (1991-12-01), Offers et al.
patent: 5384842 (1995-01-01), Tapping et al.
Newton's Telecom Dictionary by Harry Newton 8th Edition p. 582 "Key Telephone System", 1994.

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