Boots – shoes – and leggings
Patent
1996-11-21
1997-11-25
Ngo, Chuong D.
Boots, shoes, and leggings
G06F 1710
Patent
active
056919298
ABSTRACT:
A 90-degree digital phase shift network includes at least two all-pass digital filters which have a phase difference of 90 degrees therebetween. These digital filters are adapted to receive the same signal. Each of the all-pass digital filters has phase characteristics .theta. (.omega.) given by ##EQU1## where T represents a sampling period, P.sub.i a real number indicative of a filter coefficient, .omega. the angular frequency, m a weight variable, n'=n/2 (n=even number), n'=(n+1)/2 (n=odd number), n an order of a 90-degree digital PSN, m being a positive value other than 1, and satisfying .vertline.2m.omega..vertline. / .vertline.P.sub.i .vertline.<1 when .omega. T is sufficiently lower than 1, while satisfying .vertline.-P.sub.i .omega. T.sup.2 .vertline. / 2m<1 when .omega. T is substantially equal to .pi..
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Icom Incorporated
Ngo Chuong D.
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