Boots – shoes – and leggings
Patent
1977-02-14
1978-06-13
Ruggiero, Joseph F.
Boots, shoes, and leggings
364746, G06F 1534
Patent
active
040952754
ABSTRACT:
The disclosure relates to a pulse width modulated sine-cosine wave generator in which all bits of a first counter, save the most significant bit, address a read only memory (ROM) which has a programmed output for each address. The ROM has sine and cosine half cycle bit outputs (logic ONES and ZEROES). The remaining bit outputs of the ROM are applied to control a variable modulo counter. When the variable modulo counter counts to its capacity or modulo, it is load enabled, and an end of state signal is sent to the first counter which then advances to its next state. When the variable modulo counter is enabled, it receives the ROM output which results from the previous state of the first counter. Thus, every time the first counter changes state, the ROM has impending a modulo output to apply to the input of the variable modulo counter; however, this modulo will not be loaded into the variable modulo counter until it has counts to existing modulo which is a function of the previous state of the first counter. Since the magnitude of the modulo of the variable modulo counter determines how long the first counter will remain in any one state, it therefore determines the duration of the ONES and ZEROES of the sine and cosine half cycle outputs of the ROM, and hence, the pulse width wave pattern. The most significant bit of the first counter, and the sine and cosine half wave ROM bit outputs, are applied to circuitry for algebraic logic operations to derive pulse width modulated sine and cosine waves.
REFERENCES:
patent: 3657657 (1972-04-01), Jefferson
patent: 3676655 (1972-07-01), Ancona
patent: 3727037 (1973-04-01), Zorn
patent: 3824559 (1974-07-01), Grundy
patent: 3980874 (1976-09-01), Vora
Ruggiero Joseph F.
Westinghouse Electric Corp.
Wood J. J.
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