Variable modulus digital synthesizer

Details Variable modulus digital synthesizer Variable modulus digital synthesizer

1989-02-14

1991-10-01

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 102

Patent

active

050539825

ABSTRACT:
A synthesizer capable of generating a multiplicity of output frequency signals with 1 hertz resolution utilizing binary mathematics in a binary circuit. The apparatus includes providing to an accumulator a stable reference input signal having a frequency value of K, a defined value of 2.sup.N where N is an integer, a rollover value R equal to 2.sup.N minus the synthesizer modulus M and a desired output frequency signal having a value V selected from the range of integer values between 1 and K. The accumulator, at the rate of K, periodically increments the accumulator contents A by the value V, until the accumulated value exceeds 2.sup.N -1. The accumulator's content A is then set at the next cycle of the reference input signal K to a value of A-2.sup.N +R+V. A convertor converts the values of A into an output signal. In the preferred embodiment, the accumulator includes digital circuitry having 2.sup.N capacity and performs binary arithmetic to accomplish the accumulations.

REFERENCES:
patent: 3735269 (1973-05-01), Jackson
patent: 4360788 (1982-11-01), Erps et al.
patent: 4438503 (1984-03-01), White et al.
patent: 4479192 (1984-10-01), Yamagami
patent: 4602219 (1986-07-01), Underhill et al.
patent: 4746880 (1988-05-01), McCune, Jr.
patent: 4752902 (1988-06-01), Goldberg

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