Boots – shoes – and leggings
Patent
1991-07-25
1993-09-28
Smith, Jerry
Boots, shoes, and leggings
364157, G05B 1302
Patent
active
052491161
ABSTRACT:
A digital control system includes an actuator (2) for controlling a state variable of a process, a sensor (3) for detecting the state variable, and an A/D converter (4) for converting the measured state variable into a series of m-bit digital signal words I(k). These are processed by a digital processor (5) which includes a digital subcircuit (6) for normalizing the signal words I(k) and/or stablizing the gain of the control system. The subcircuit (6) includes a comparator circuit (21) which receives at an input thereof a series of m-bit signal words a(k) related to the series of measured signal words I(k), the converter being in series with an integrating filter (24) and a quantizing circuit (25). A multiplier (20) is connected in a negative feedback path from the output of the subcircuit to another input of the comparator (21). A series of p-bit output signal words is produced at the output of the quantizing circuit having a low frequency component equal to the quotient of the series of m-bit signal words a(k) divided by a multi-bit signal word b supplied to another input of the multiplier (20). The number of bits p per signal word at the output of the subcircuit is strongly reduced relative to the number of bits m per signal word a(k), so that only a limited number of components are required in the multiplier and also the total number of components of the subcircuit is reduced. Such a control system may be employed to control focusing and tracking of the scanning beam in optical recording and/or reproducing apparatus.
REFERENCES:
patent: 4602326 (1986-07-01), Kraus
patent: 4631675 (1986-12-01), Jacobsen et al.
patent: 5072357 (1991-12-01), Niessen et al.
patent: 5157596 (1992-10-01), Alcone
Eason Leroy
Gordon Paul
Smith Jerry
U.S. Philips Corporation
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