Dual-bandwidth cellular telephone

Details Dual-bandwidth cellular telephone Dual-bandwidth cellular telephone

1989-06-23

1990-11-20

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, 455 76, H04M 1100

Patent

active

049724550

ABSTRACT:
A unique dual-bandwidth cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different filters (408 and 410) in the intermediate frequency section thereof which are switchably selected depending on which cellular telephone system is available. When service is not available in one of the cellular telephone systems, the unique cellular telephone automatically switches the receiver bandwidth and control program for operating on the other cellular telephone system.

REFERENCES:
patent: 4132952 (1979-01-01), Hongu et al.
patent: 4135158 (1979-01-01), Parmet
patent: B14268915 (1985-12-01), Parmet
patent: 4408348 (1983-10-01), Theriault
patent: 4527281 (1985-07-01), Imagawa et al.
patent: 4573211 (1986-02-01), Kupfer
patent: 4577171 (1986-03-01), Heigl et al.
patent: 4710973 (1987-12-01), Suzuki
patent: 4736457 (1988-04-01), Kupfer
patent: 4802238 (1989-01-01), Fischer et al.
Hewlett Packard Operating Manual No. 8901A entitled "Modulation Analyzer", Mar. 1980.
Collins Radio Company Instruction Book No. 75A-3, entitled "Amateur-Band Receiver", Jun. 1, 1953.

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