Offset down conversion for a two-handset cordless telephone syst

Details Offset down conversion for a two-handset cordless telephone syst Offset down conversion for a two-handset cordless telephone syst

1992-01-08

1995-02-21

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 455 541, 455303, H04M 1100

Patent

active

053923308

ABSTRACT:
It is desirable that a cordless telephone system include a single base unit and at least two remote handunits. With such a system, two users may maintain participation in a three-way conversation while being free to move about within reasonable transmitting distance to and from the base unit. Circuitry is provided in which the signal received from one handunit is transmitted to the other handunit, and sidetone from one handunit is transmitted back to that handunit. The base unit comprises first and second double conversion intermediate frequency arrangements with respective first IF frequency portions being tuned away from a nominal frequency value by a substantially equal amount in opposite directions.

REFERENCES:
patent: 4476575 (1984-10-01), Franke et al.
patent: 4759078 (1988-07-01), Schiller
patent: 4875231 (1989-10-01), Hara et al.
patent: 4932072 (1990-06-01), Toko
patent: 5133002 (1992-07-01), Kikuchi et al.

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