Boots – shoes – and leggings
Patent
1988-02-17
1990-08-28
Harkcom, Gary V.
Boots, shoes, and leggings
36472413, 36472416, G06F 1531
Patent
active
049531182
ABSTRACT:
A nonrecursive half-band filter which permits the conversion of a complex-value input signal into a complex-value output signal. The pulse response of the filter is modulated onto a complex carrier at a frequency of 1/4 or 3/4 of the sampling rate, the zero phase of this frequency is a whole multiple of .pi./2, and the sampling rate is halved. Another embodiment of the filter also permits the conversion of a complex-value input signal into a complex-value output signal. In the second embodiment the pulse response is modulated onto a complex carrier of a frequency of one-half the input sampling rate, the zero phase of this frequency is a whole number multiple of .pi./2, and the sampling rate is doubled.
REFERENCES:
patent: 4344149 (1982-08-01), van de Meeberg et al.
patent: 4388693 (1983-06-01), Nakayama
patent: 4423488 (1983-12-01), Campbell
patent: 4460890 (1984-07-01), Busby
patent: 4521866 (1985-06-01), Petit et al.
patent: 4701956 (1987-10-01), Katoh
patent: 4725972 (1988-02-01), Gockler
patent: 4777612 (1988-10-01), Tomimitsu
patent: 4896320 (1990-01-01), Gockler
Bellanger et al., "Interpolation, Extrapolation, and Reduction of Computation Speed in Digital Filters," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-22, No. 4 (Aug. 1974), pp. 231-235.
Stearns, "Digital Signal Analysis" (1975), pp. 102-121.
ANT Nachrichtentechnik GmbH
Harkcom Gary V.
Mai Tan V.
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