Arrangement for providing signalling tones and volume control si

Details Arrangement for providing signalling tones and volume control si Arrangement for providing signalling tones and volume control si

1983-04-25

1985-07-09

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

455355, 179 2EA, H04B 138

Patent

active

045286965

ABSTRACT:
A keyboard with number and volume control pushbuttons is provided with a microcomputer, a digital-to-analog converter, and an output circuit to provide signalling tones to a radio transmitter in response to operation of the number pushbuttons, and to provide volume control signals to a radio receiver in response to operation of the volume control pushbuttons.

REFERENCES:
patent: 4065755 (1977-12-01), Oliveira
patent: 4101871 (1978-07-01), Oliveira
patent: 4145655 (1979-03-01), Caudel et al.
patent: 4168399 (1979-09-01), D'Amico et al.
patent: 4179588 (1979-12-01), Oliveira
patent: 4223352 (1980-09-01), Belisomi

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