Apparatus for generating a multi-frequency signal

Details Apparatus for generating a multi-frequency signal Apparatus for generating a multi-frequency signal

1985-07-31

1987-09-22

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328143, 328 61, 328 62, 307529, H03L 718, H03B 2100

Patent

active

046958045

ABSTRACT:
An appartus for generating a multi-frequency signal includes a D/A converter, two converter circuits connected to the D/A converter for determining a respective connecting instant, two controlled waveform counters each being connected to a respective one of the converter circuits, a D/A cycle control connected to the converter circuits for monitoring the converter circuits, a sample-and-hold circuit having divider capacitors and being connected to the D/A converter, and holding capacitors connected to the sample-and-hold circuit.

REFERENCES:
patent: 3657657 (1972-04-01), Jefferson
patent: 3820028 (1974-06-01), Thomas
patent: 3838414 (1974-09-01), Wiles
patent: 4053839 (1977-10-01), Knoedl
patent: 4058805 (1977-11-01), Lake
patent: 4068178 (1978-01-01), Tunzi
patent: 4404430 (1983-09-01), Ogita
patent: 4446436 (1984-05-01), Ireland
patent: 4504741 (1985-03-01), Armitage
Electronic Components and Application, vol. 1, No. 1, Oct. 1978, "Two-Tone Telephone Dialing", by Geboers et al, pp. 29-40.
"PLA" Handbook, 3rd Edition, pp. 1-4 to 1-15 of the Firm Monolithic Memories, Inc.

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