Key-in sound-generating circuit

Details Key-in sound-generating circuit Key-in sound-generating circuit

1987-04-06

1988-10-04

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

379395, 379362, 379418, H04M 126

Patent

active

047760087

ABSTRACT:
A key-in sound-generating circuit comprises a keyboard including dial number keys and function keys, a DTMF signal generator coupled, at the output terminal, with a telephone network, a sound generator for converting, into a sound, the output signal from the DTMF signal generator, and a data processor circuit for executing the key data processing according to the keying operation performed using the keyboard, and supplying a control signal to the DTMF signal generator, the data processor being responsive to the operation of the dial number key, to supply a DTMF signal to the keyboard and the sound generator, and responsive to the operation of the function key, to supply a single-frequency signal to the keyboard and the sound generator.

REFERENCES:
patent: 4042790 (1977-08-01), Richards
patent: 4227055 (1980-10-01), Hanson
patent: 4399535 (1983-08-01), Southand
patent: 4496799 (1985-01-01), Kingen et al.
patent: 4497980 (1985-02-01), Gorman et al.
patent: 4503291 (1985-03-01), von Holten et al.
patent: 4528681 (1985-07-01), Fulcomer, Jr.
patent: 4571723 (1986-02-01), Lusignan et al.
patent: 4669110 (1987-05-01), Daie et al.

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