Squelch circuit for volume control of a radio transmitter and re

Details Squelch circuit for volume control of a radio transmitter and re Squelch circuit for volume control of a radio transmitter and re

1992-08-11

1994-10-11

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

4552321, 381109, H04B 110

Patent

active

053555317

ABSTRACT:
A squelch circuit for a radio transmitter/receiver includes an amplifier, a digitally-controlled electronic volume control, a volume adjusting variable resistor, and a volume controller. The amplifier amplifies a received audio signal input and provides the received audio signal to a loudspeaker. The digitally-controlled electronic volume control changes the output level of the amplifier. The volume adjusting variable resistor outputs data representing a volume value. The volume controller constantly detects changes in volume value data output from the variable resistor, and controls an attenuation amount of the digitally-controlled electronic volume control in accordance with the volume value represented by the variable resistor. While in a "mute" state, this volume control continues until a predetermined time has elapsed since the detection of the change in volume value data. The volume controller then sets the attenuation amount of the digitally-controlled electronic volume control to an infinite attenuation amount.

REFERENCES:
patent: 3496481 (1970-02-01), Torick et al.
patent: 3714579 (1973-01-01), Valdes et al.
patent: 4683386 (1987-07-01), Kamikawara
patent: 5130665 (1992-07-01), Walden

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