Sound generation circuit

Details Sound generation circuit Sound generation circuit

1992-04-03

1993-05-04

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379361, 379418, H04M 150

Patent

active

052088529

ABSTRACT:
A sound generation circuit for producing a dual tone which includes memory circuitry for storing data for controlling production of the dual tone, selection circuitry for selecting data stored in the memory circuitry and frequency dividers for producing an output signal having a frequency which varies based on the data selected by the selection circuitry. The production of the dual tone is based on the output signal of the frequency dividing circuitry. The sound generation circuit also includes logic circuitry to inhibit selection by the selection circuitry of data for controlling production by the sound generation circuit of a musical note when the sound generation circuit is currently producing a dual tone. The melody and dial sections of the sound generation circuit employ common elements.

REFERENCES:
patent: H118 (1986-09-01), Biggs et al.
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3820028 (1974-06-01), Thomas
patent: 4058805 (1977-11-01), Lake
patent: 4061856 (1977-12-01), Callahan, Jr. et al.
patent: 4064367 (1977-12-01), O'Malley
patent: 4132871 (1979-01-01), Lake
patent: 4273019 (1981-06-01), Goto
patent: 4328731 (1982-05-01), Gotho et al.
patent: 4390754 (1983-06-01), Holberg
patent: 4571462 (1986-02-01), Janssen
Your Telephone: Operation, Selection and Installation, 1983, "The Dial Tone", p. 25, Touch Tone System, p. 35.

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