Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1992-03-11
1993-08-03
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379164, 379257, 379372, H04M 1102
Patent
active
052336417
ABSTRACT:
Radio telephone equipment having a sounding device, a sounding device drive circuit for driving the sounding device, and a control circuit for controlling the sounding device drive circuit. When a person manipulates the equipment to originate a call, the equipment interchanges various control signals with a base station to set up a channel for communication. Then, the base station sends to the equipment a control signal indicative of the fact that the other party has responded to the call. In response, the equipment causes the control circuit to activate the sounding device drive circuit which in turn generates a predetermined alert tone to show the user that a conversation is allowed to be held.
REFERENCES:
patent: 4640987 (1987-02-01), Tsukada et al.
patent: 4847818 (1989-07-01), Olsen
patent: 4884294 (1989-11-01), Inagami
patent: 4893335 (1990-01-01), Fuller et al.
AT&T Bell Labs publication Record article: "LASS: Putting the telephone customer in charge", Hirschman et al., May 1985, pp. 11-16.
Bost Dwayne D.
Kuntz Curtis
NEC Corporation
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