Digitally synthesized multi-frequency signal generator

Details Digitally synthesized multi-frequency signal generator Digitally synthesized multi-frequency signal generator

1977-06-22

1979-01-02

Claffy, Kathleen H.

328 14, H04M 150

Patent

active

041328710

ABSTRACT:
A solid state signal generator for producing frequency combinations such as used in multi-tone telephone systems. The output of a crystal oscillator is divided to obtain binary signals proportional to the selected pairs of the seven multi-tone frequencies. These signals are scaled with selected binary output signals generated by a free-running pattern generator and representing slopes at various points on a sine wave to produce a binary signal stream that is applied to a controlled charge digital-to-analog conversion circuit that partially charges or discharges a capacitor in accordance with the binary 1's and 0's to produce an output waveform across the capacitor that corresponds to the combined pair of selected individual tone frequency sinusoids.

REFERENCES:
patent: 4007459 (1977-02-01), Hagelbarger
patent: 4017693 (1977-04-01), Roche et al.

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