Boots – shoes – and leggings
Patent
1979-04-30
1981-08-11
Ruggiero, Joseph F.
Boots, shoes, and leggings
328 14, 328 18, 364718, G06J 100, H03B 1900
Patent
active
042837685
ABSTRACT:
A digital synthesizer is disclosed for generating complex waveforms of seted multiple frequencies and selected phases in the time domain. A plurality of independent frequency sources each produces square waves at its selected fundamental frequency and at frequencies which are integral multiples, such as twice, four times and eight times, that of the fundamental. A sampling clock whose frequency is at least the highest frequency produced by any frequency source, multiplied by the number of fundamentals used, provides a signal to a binary counter whose output is connected to a line decoder or multiplexer which multiplexes each frequency source's signals on a time-share basis via a system of AND and OR gates. The signal produced by the OR gates is provided to address a memory device which contains a predetermined waveform in a look-up table. The signal produced by the memory device is therefore the multiplexed combination of the signals that would have been produced therefrom had each frequency source alone been applied to address the memory. The complex waveform produced by the memory is provided to a plurality of serial in-parallel out shift registers whose outputs are applied to a plurality of digital-to-analog converters each producing identical waveforms time-delayed with respect to each other.
REFERENCES:
patent: 3735269 (1973-05-01), Jackson
patent: 3772681 (1973-11-01), Skingle
patent: 3845395 (1974-10-01), Murphree
patent: 3952189 (1976-04-01), Fabricius
patent: 4016495 (1977-04-01), Machanian
patent: 4073209 (1978-02-01), Whittington et al.
Hansen Henry
Ruggiero Joseph F.
Sciascia R. S.
The United States of America as represented by the Secretary of
Weinstein Stanton D.
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