Boots – shoes – and leggings
Patent
1976-10-01
1978-01-10
Grimm, Siegfried H.
Boots, shoes, and leggings
364718, 328 48, 340347DA, H03B 1900
Patent
active
040681785
ABSTRACT:
A variable frequency waveform synthesizer includes a programmable counter coupled to count cycles of a single reference clock signal and recycle at an intermediate frequency determined by a count number selected in response to frequency selection signals. Because of the need to select an integral count number, a count number that is exactly required for a desired frequency must be rounded off to the nearest integral number and the higher the number the lower the percent round off error. Thus, the percentage frequency error for a plurality of different waveforms that are synthesized as a sequence of discrete steps derived from a common reference clock signal is reduced by dividing the reference frequency to obtain an intermediate frequency signal and dividing each period of the intermediate frequency signal into a plurality of not necessarily equal steps to obtain a stepping signal commanding step changes in the synthesized waveform. The stepping signal is thus exactly periodic at the intermediate frequency and approximately periodic at the higher stepping frequency while the resulting synthesized waveform has a reduced percentage frequency error and only a small harmonic distortion.
REFERENCES:
patent: 3719897 (1973-03-01), Tarr
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3952189 (1976-04-01), Fabricius
Grimm Siegfried H.
Telenetics, Inc.
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