Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
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.
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patent: 5182774 (1993-01-01), Bourk
patent: 5216721 (1993-06-01), Melton
Berger Douglas L.
Jones Donald G.
Hofsass Jeffery
Honeycutt Gary C.
Saint-Surin Jacques M.
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