Digitally synthesized touch-tone audio signal generator

Details Digitally synthesized touch-tone audio signal generator Digitally synthesized touch-tone audio signal generator

H - Electricity

04

M

331/10, 379/22

H04M 1/50 (2006.01) G06F 1/02 (2006.01) H03K 4/02 (2006.01) H03K 6/00 (2006.01)

Patent

CA 1106088

ABSTRACT OF THE DISCLOSURE A solid state signal generator for producing frequency combinations such as used in telephone touch-tone systems. The output of a crystal oscillator is divided to obtain binary signals proportional to the selected pairs of the seven touch-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.

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