Direct digital synthesizer

Boots – shoes – and leggings

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G06F 102

Patent

active

050311310

ABSTRACT:
An improved digital data synthesizer has a phase accumulator into which adjustable step increments are clocked. The output of the phase accumulator is connected to address a memory, in which a waveform function is digitally stored. Samples read from the memory at the successive addresses are converted to analog form and filtered to produce a final output signal of a desired frequency. Register stages of the phase accumulator are pipelined to increase their speed. The synthesizer has a plurality of digital-to-analog converters, all on a single chip to equalize the delay times occurring within them. A lookup memory permits a variety of output waveforms to be generated. Several lookup tables for the same waveform are stored with different phase spacing between addresses, and a decoder/addresser automatically selects the lookup table that has been found to result in best performance for a particular frequency. One or more correction lookup table can also be provided. The outputs of the main table and the correction table are combined to produce an analog signal of reduced distortion.

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patent: 3973209 (1976-08-01), Nossen et al.
patent: 4134072 (1979-01-01), Bolger
patent: 4328554 (1982-05-01), Mantione
patent: 4635279 (1987-01-01), Nossen
patent: 4652832 (1987-03-01), Jasper
patent: 4669024 (1987-05-01), Stacey
patent: 4752902 (1988-06-01), Goldberg
patent: 4809205 (1989-02-01), Freeman

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