Radio telephone having improved modulation characteristics for d

Details Radio telephone having improved modulation characteristics for d Radio telephone having improved modulation characteristics for d

1990-03-23

1992-12-01

Kuntz, Curtis

Telephonic communications

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

Including fiber optic link within telephone network

379 61, 455 70, 455 93, H04M 1100

Patent

active

051685167

ABSTRACT:
A radio telephone system of the multi-channel access type using an empty channel selected from a plurality of channels for radio telephone communication of voice audio or data signals and a method of controlling such a radio telephone system. The method and apparatus can improve the data communication quality without reducing the number of available channels. A switching circuit is provided in at least one of the base unit and the radio telephone for changing the frequency characteristic of the signal to be transmitted when the signal is a data signal.

REFERENCES:
patent: 4654867 (1987-03-01), Labedz et al.
patent: 4661659 (1987-04-01), Nishimura
patent: 4780715 (1988-10-01), Kasugai
patent: 4837800 (1989-06-01), Freeburg et al.
patent: 4881129 (1989-11-01), Mitsuhashi
Advertisement: Hello Direct Catalog, "Now You Can Transmit and Receive Data from Your Cellular Phone-Error Free"; p. 22, May 1988.
Advertisement: Telephony, "Cellular Option/The Cellular Connection"; p. 62, Dec. 1986.
Article: The Washington Post, "Fax in the Fast Lane"; Style Section, Dec. 29, 1988, by Megan Rosenfeld.

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