Phase accumulator with dithered incrementing of accumulation due

Details Phase accumulator with dithered incrementing of accumulation due Phase accumulator with dithered incrementing of accumulation due

1989-08-25

1991-01-08

Malzahn, David H.

Boots, shoes, and leggings

328 14, G06F 102

Patent

active

049841866

ABSTRACT:
A phase accumulator for accumulating digital frequency words, which, as accumulated, represent the phase of a cyclic waveform of a predetermined frequency. The phase accumulator includes a coarse-component accumulator for accumulating coarse phase components of the digital frequency words; a fine-component accumulator for accumulating fine phase components of the digital frequency words; and means for incrementing the coarse-component accumulator in response to accumulation of the fine phase components. The incrementing means include means for providing a variable randomly generated value for each fine-component accumulation cycle; means for periodically sampling the accumulation of the fine phase components in relation to the randomly generated value; and means for incrementing the coarse component register for each fine-component accumulation cycle, with the phase of said incrementing being dithered in accordance with the number of times the accumulated fine phase components exceed the randomly generated values during the sampling period.

REFERENCES:
patent: 4901265 (1990-02-01), Kerr et al.
patent: 4905177 (1990-02-01), Weaver, Jr. et al.
patent: 4935891 (1990-06-01), Curry
Wheatley and Phillips, "Spurious Suppression in Direct Digital Synthesizers", Proc. 35th Annual Frequency Control Symposium, May 1981, pp. 425-435.

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