Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter includes circuit for performing an arithmetic function
Patent
1982-07-16
1985-03-05
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter includes circuit for performing an arithmetic function
377 39, 328143, 328144, 364752, G06G 720, G06F 738, G06F 762
Patent
active
045035490
ABSTRACT:
A function generator for extracting the square root or other function of a pulse width modulated input signal is disclosed. The function generator utilizes a ROM table (12) which contains values of the inverse of the desired function. Two eight-bit counters (26, 28) are clocked in proportion to the duty cycle of the input signal and the duty cycle of a flip-flop (22), which is related to the output of the ROM (12). The counters (26, 28) keep a running average of the comparison of the foregoing duty cycles and, in turn, cause a four-bit up/down counter (30) and the ROM (12) to cycle in time between the value in the ROM (12) above and below the exact input value. In this manner, the output of a four-bit up/down counter (30) is an accurate interpolated representation of the square root of the input signal.
REFERENCES:
patent: 3566095 (1971-02-01), Schmitz
patent: 3621403 (1971-11-01), Seiy
patent: 4229795 (1980-10-01), Vieweg et al.
patent: 4339657 (1982-07-01), Larson et al.
patent: 4420814 (1983-12-01), Arikawa et al.
Edwards Robert J.
Heyman John S.
Matas Vytas R.
The Babcock & Wilcox Company
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