Integrated circuit for generating a melody and ring

Details Integrated circuit for generating a melody and ring Integrated circuit for generating a melody and ring

1990-02-23

1992-03-24

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379373, 379252, H04M 1102

Patent

active

050995138

ABSTRACT:
An integrated circuit for generating a melody and ring comprises a starting voltage detector a frequency discriminator a controller a ring/melody data ROM an oscillator/frequency doubler a frequency divider a tempo/rhythm generator a chord generator an original-melody generator and an envelope output part. A ring circuit and melody circuit are formed together in one chip, thereby can reduce the prime cost of the telephone by generating selectively a ring signal in a ring mode or a melody signal in a melody mode.

REFERENCES:
patent: 4480153 (1984-10-01), Festa
patent: 4720848 (1988-01-01), Akiyama
patent: 4856055 (1989-08-01), Schwartz
patent: 4866766 (1989-09-01), Mitzlaff

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