Multi-tone signal generator

Details Multi-tone signal generator Multi-tone signal generator

H - Electricity

04

M

379/20

H04M 1/50 (2006.01) G06F 1/03 (2006.01)

Patent

CA 1194245

Abstract of the Disclosure A multi-tone signal generator and tone generating method for producing frequency combinations such as those used in dual-tone telephone dialing systems. A phase accumulator tone generator generates samples of one of the tones to be encoded, at a rate much lower than would normally be required by the Nyquist criterion for the highest frequency desired. The output rate is specifically chosen so that a distortion product appears at the frequency of the second tone to be generated. The resulting samples are applied to a D/A converter and then passed through a low pass filter.

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