Series ringing signal generator

Details Series ringing signal generator Series ringing signal generator

1989-05-22

1990-10-09

Dwyer, James L.

Telephonic communications

Call signal generating

379253, 379255, H04M 302

Patent

active

049625276

ABSTRACT:
A series ringing signal generator is disclosed which comprises a source of a user control signal. A programmable ringing signal generator is provided for generating an analog sine wave signal having a selectable amplitude and frequency in response to a selection signal. Finally, sequencing means, coupled between the source of the user control signal and the programmable ringing signal generator, is provided for generating a sequence of selection signals in response to said user control signal.

REFERENCES:
patent: 4270028 (1981-05-01), Young
patent: 4284854 (1981-08-01), Hayward et al.
patent: 4349703 (1982-09-01), Chea, Jr.
"A Microcomputer Controlled Digital Frequency Synthesizer" M. Wagdy, IEEE MTC/86 Conference Record; Mar. 25-27, 1986, pp. 236-238.

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