1976-08-02
1977-11-01
Cooper, William C.
328 14, H04M 150
Patent
active
040566927
ABSTRACT:
A stable generator produces a reference square wave signal having a stable given frequency. Logic circuitry is coupled to the generator to provide a plurality of square wave signals each having a different predetermined frequency, each of the predetermined frequencies having a different predetermined relationship to the given frequency. A switching arrangement is coupled to the logic circuitry to select at least one of the plurality of square wave signals of the logic circuitry. A ring counter, resistor tone mixing circuit and filter are coupled to the logic circuitry to provide as an output signal of the digital tone generator a sine wave tone having a frequency equal to the predetermined frequency divided by a given factor of the selected one of the plurality of square wave signals.
REFERENCES:
patent: 3778557 (1973-12-01), Frederiksen
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3820028 (1974-06-01), Thomas
patent: 3946164 (1976-03-01), Beeman
Cooper William C.
Hill Alfred C.
International Telephone and Telegraph Corporation
O'Halloran John T.
Popek Joseph A.
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