Boots – shoes – and leggings
Patent
1993-03-02
1994-03-01
Mai, Tan V.
Boots, shoes, and leggings
364721, 328 14, G06J 100
Patent
active
052914283
ABSTRACT:
Spurious frequency components from the output signal of a direct digital synthesizer are reduced with minimum degradation of the fundamental frequency of the output signal. The synthesizer has a phase accumulator for receiving digital multibit modulation data words from a source, a periodic wave function converter for converting the modulation data words into digital waveform data words and a digital-to-analog converter for converting the digital waveform data words into an analog signal which serves as the output signal. The output signal has a frequency and waveform dictated by the modulation data words. Reduction of spurious frequency components is achieved by generating a dither waveform representing a band limited waveform. The dither waveform is summed with the modulation data words prior to application to the wave function converter to provide a dither modulated analog output signal. A sampled dither signal is combined with the dither modulated analog output signal in such a manner that the dither waveform is cancelled from the fundamental waveform of the analog output signal.
REFERENCES:
patent: 4652832 (1987-03-01), Jasper
patent: 4901265 (1990-02-01), Kerr et al.
patent: 4951237 (1990-08-01), Essenwanger
patent: 5010506 (1991-04-01), Hrncirik
Talbot Daniel B.
Twitchell Edwin R.
Harris Corporation
Mai Tan V.
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