Radio telephone with variable attenuator for controlling modulat

Details Radio telephone with variable attenuator for controlling modulat Radio telephone with variable attenuator for controlling modulat

1990-03-13

1991-09-03

Ng, Jin F.

Telephonic communications

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

Including fiber optic link within telephone network

379 63, 455116, H04M 1100

Patent

active

050460811

ABSTRACT:
A variable attenuating circuit is provided between a control circuit of a radio telephone and a transmitter to control the level of the control signal to either terminate or hold the speech when either the speech terminating or the holding operation is performed. When the control signal for either speech termination or speech holding is transmitted from the radio telephone to a base unit, the degree of attenuation by the attenuating circuit is controlled so as to be reduced. Thus, the level of the control signal in the transmitter is controlled to thereby reduce the level of the control signal leaking possibly to the cable telephone line. When the base unit cannot receive the control signal to either terminate or hold the speech, it restores the original degree of attenuation of the attenuating circuit and again sends the control signal to either terminate or hold the speech.

REFERENCES:
patent: 4232392 (1980-11-01), French
patent: 4392245 (1983-07-01), Mitama
patent: 4629829 (1986-12-01), Pohl et al.
patent: 4727568 (1988-02-01), Morishima
patent: 4731866 (1988-03-01), Moratani et al.

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