Boots – shoes – and leggings
Patent
1996-03-06
1999-06-15
Moise, Emmanuel L.
Boots, shoes, and leggings
G06F 1710
Patent
active
059128275
ABSTRACT:
To reduce a circuit scale of an FIR (finite impulse response) type digital filter employed in a hardwared QPSK demodulator, two sets of outputs being symmetrical with each other with respect to a center of shift registers are inputted to sum of products circuits. Then, these outputs are multiplied by the respective tap coefficients, and the multiplied results are added to each other. Furthermore, the added results (containing a multiplied value of a tap coefficient of a center tap in case of even-numbered taps) are summed by an adder to thereby obtain a final result. Since the multiplied results obtained at. the respective taps of the rolloff filter for the QPSK modulator, and the added result at the first stage are replaced by 0, or changed by the codes of the tap coefficients, the sum of products circuits may be arranged by two sets of selecting circuits and an exclusive-OR gate circuit for producing selection signals thereof.
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N.K. Bose, "Digital Filters: Theory and Applications", North-Holland, pp. 270-299.
Moise Emmanuel L.
NEC Corporation
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