Cellular telephone responsive to service availability for operat

Details Cellular telephone responsive to service availability for operat Cellular telephone responsive to service availability for operat

1990-04-20

1991-04-16

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 63, 455340, H04M 1100

Patent

active

050089250

ABSTRACT:
A unique dual-system 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: 4135158 (1979-01-01), Parmet
patent: 4268915 (1985-12-01), Parmet
patent: 4670905 (1987-06-01), Sandros et al.
patent: 4742560 (1988-05-01), Arai
patent: 4748655 (1988-03-01), Thrower et al.
patent: 4771448 (1988-09-01), Koohgoli et al.
patent: 4775999 (1988-10-01), Williams
patent: 4803679 (1989-02-01), Shimizu
patent: 4811380 (1989-03-01), Spear
patent: 4833701 (1989-05-01), Comroe et al.
patent: 4833702 (1989-05-01), Shitara et al.
Hewlett Packard Operating Manual No. 8901A entitled "Modulation Analyzer", Mar. 1980.
Collins Radio Company Instruction Book No. 75A-3, entitled "Amateur-Bond Receiver", Jun. 1, 1953.
Motorola Brochure No. RB-10-16 entitled Dyna TAC 6000X Universal Mobile Telephone, 1984.

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