Cordless parent/slave telephone set with improved sidetone handl

Details Cordless parent/slave telephone set with improved sidetone handl Cordless parent/slave telephone set with improved sidetone handl

1997-08-06

1999-04-06

Chin, Wellington

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455500, 455 63, 455 673, 455570, H04Q 720, H04Q 734

Patent

active

058930345

ABSTRACT:
A parent telephone set comprises a transformer, a sidetone level reducing circuit, and a first secret talk processing circuit for executing digital secret talk processing, a counterpart slave telephone set comprises a second secret talk processing circuit for executing digital secret talk processing, a delaying circuit for delaying an aural signal from the slave telephone set microphone by a specified delay time, and a level reducing circuit for reducing the level of output from the second secret talk processing circuit according to the output from the delaying circuit. The specified delay time in the delaying circuit is set according to the time required for digital secret talk processing in the first secret talk processing circuit as well as in the second secret talk processing circuit.

REFERENCES:
patent: 4685099 (1987-08-01), White et al.
patent: 4776001 (1988-10-01), Murata et al.
patent: 4856083 (1989-08-01), Makino
patent: 5263079 (1993-11-01), Umemoto
patent: 5381475 (1995-01-01), Cavallo
patent: 5420860 (1995-05-01), Stevens et al.
patent: 5444477 (1995-08-01), Yamadera et al.
patent: 5485504 (1996-01-01), Ohnsorge
patent: 5553137 (1996-09-01), Nyhart et al.

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