Boots – shoes – and leggings
Patent
1983-09-23
1986-04-29
Harkcom, Gary V.
Boots, shoes, and leggings
364604, 364724, 364819, 324 77G, G06F 15336, G06J 100, G06G 719
Patent
active
045861536
ABSTRACT:
A serial cross-correlator having a pair of input ports (L and R). One of these ports (L) is connected to a first band-pass filter network (63) which is in turn connected to a digital Hilbert transformer (60). The other of the input ports (R) is connected to a second band-pass filter network (64) which is in turn connected to fixed delay (65). The output of the Hilbert transformer is connected to one input of a multiplier (66) while the output of the fixed delay is connected to the other input of the multiplier; and a low pass filter network (67) is connected to the output of the multiplier. The Hilbert transformer produces a 90.degree. phase shift for input signals on line (61) from input port (L) relative to input signals on line (62) from input port (R) and the delay compensates for the delay in the Hilbert transformer so that signals reaching input port (L) are phase-shifted relative to the signals reaching input port (R) and the phase-shifted signals are multiplied with the other input signals to produce an output signal (DX) representative of the direction and magnitude of an arrival time difference between the two input signals.
REFERENCES:
patent: 3197625 (1965-07-01), Ratz
patent: 3961172 (1976-06-01), Hutcheon
patent: 4089061 (1978-05-01), Milewski
patent: 4283767 (1981-08-01), Rountree
patent: 4388595 (1983-06-01), Brooks
patent: 4433422 (1984-02-01), Kurth
A. V. Oppenheim et al., "Discrete Hilbert Transforms", Digital Processing, Chapter 7, pp. 337-375, Prentice-Hall, Inc., 1975.
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