Radio telephone equipment having a sounding device for generatin

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

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Details

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.

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