Voice transmission systems with voice cancellation

Details Voice transmission systems with voice cancellation Voice transmission systems with voice cancellation

1993-02-16

1996-06-11

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379388, 379433, 379390, 379410, H04B 1500

Patent

active

055264212

ABSTRACT:
A voice transmission system including a microphone (13) in combination with active sound cancellation means comprising a speaker (14) and a signal processor (17) for generating a mirror-image waveform with respect to the signal generated when speaking into the microphone. The mirror-image waveform is used to activate the speaker (14) thereby cancelling the user's voice. This provides the user with complete privacy, since the cancellation prevents the user's voice from being overheard by others, even in a crowded area.

REFERENCES:
patent: 4654871 (1987-03-01), Chaplin et al.
patent: 4769847 (1988-09-01), Taguchi
patent: 4815139 (1989-03-01), Ericksson et al.
patent: 4850016 (1989-07-01), Groves et al.
patent: 4876722 (1989-10-01), Dekker et al.
patent: 5033082 (1991-07-01), Ericksson et al.
patent: 5182774 (1993-01-01), Bourk
patent: 5216721 (1993-06-01), Melton

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