Boots – shoes – and leggings
Patent
1993-10-20
1995-10-17
Mai, Tan V.
Boots, shoes, and leggings
327105, G06F 102
Patent
active
054596807
ABSTRACT:
A technique for reducing the spurious signal content in digital sinusoid synthesis. Spur reduction is accomplished through dithering both amplitude and phase values prior to word-length reduction. The analytical approach developed for analog quantization is used to produce new bounds on spur performance in these dithered systems. Amplitude dithering allows output word-length reduction without introducing additional spurs. Effects of periodic dither similar to that produced by pseudo-noise (PN) generator are analyzed. This phase dithering method provides a spur reduction of 6(M+1) dB per phase bit when the dither consists of M uniform variates. While the spur reduction is at the expense of an increase in system noise, the noise power can be made white, making the power spectral density small. This technique permits the use of a smaller number of phase bits addressing sinusoid look-up tables, resulting in an exponential decrease in system complexity. Amplitude dithering allows the use of less complicated multipliers and narrower data paths in purely digital applications, as well as the use of coarse-resolution, highly-linear digital-to-analog converters (DACs) to obtain spur performance limited by the DAC linearity rather than its resolution.
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Flanagan Michael J.
Zimmerman George A.
Jones Thomas H.
Kusmiss John H.
Mai Tan V.
Miller Guy M.
The United States of America as represented by the Administrator
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