Radio loudspeaker telephone device capable of automatically prev

Details Radio loudspeaker telephone device capable of automatically prev Radio loudspeaker telephone device capable of automatically prev

1992-10-28

1995-01-03

Kuntz, Curtis

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 541, 455 673, 455 78, 379 58, 379389, 379390, H04B 7015, H04M 908

Patent

active

053794508

ABSTRACT:
In a radio loudspeaker telephone device (30) having a radio controller (18) which makes a radio transmitter (15, 17) transmit to a radio channel a dial signal representative of a destination subscriber telephone set, the radio controller produces a timing signal representative of a first time instant at which the radio controller receives a response signal through a radio receiver (16, 17) from the radio channel. The response signal indicates that the destination subscriber telephone set is not busy. A detecting circuit (33) produces a ring-back tone detection signal while the detecting circuit detects a ring-back tone signal which is received through the radio receiver from the radio channel and which indicates that the destination subscriber telephone set is called by the telephone device. A switch unit (32) usually connects a microphone (11) to the radio transmitter. A switch controller (34) makes the switch unit disconnect the radio receiver from the microphone a time duration from the first time instant of the timing signal up to a second time instant at which the ring-back tone detection signal disappears. First and second attenuating circuits may be connected between the microphone and the switch unit and between the radio receiver and the loudspeaker, respectively.

REFERENCES:
patent: 4493950 (1985-01-01), Lott
patent: 4982425 (1991-01-01), Yoshida
patent: 5014294 (1991-05-01), Kromenaker et al.
patent: 5054061 (1991-10-01), Yoshida

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