Boots – shoes – and leggings
Patent
1980-10-06
1982-10-19
Malzahn, David H.
Boots, shoes, and leggings
364724, G06F 15336
Patent
active
043553680
ABSTRACT:
A correlator which is capable of correlating two or more signals of unknown frequency and bandwidth receives inputs on each of two or more channels. For the case of a two-channel, or pairwise, correlator the two channels are designated a first channel and a second channel. For the pairwise correlator, a first adaptive linear predictive (ALP) filter filters the input signal from the first channel and a second ALP filter filters the input signal from the second channel, the two output signals of the filters being x(k) and y(k). The adaptive linear predictive filter is an adaptive time-domain digital filter which adapts its impulse response according to a certain algorithm. The filter output represents an adaptive linear predictive estimate of the current input value, based on many past inputs. The input signals to the two channels of the pairwise correlator may correspond to sensor outputs from two or more widely separated sensors. The two output signals x(k) and y(k), are correlated in a pairwise correlator to result in a signal which corresponds to an estimate of the magnitude-squared coherence between the signal x(k) and a time-delayed, frequency-shifted, version of the signal y(k).
REFERENCES:
patent: 4006351 (1977-02-01), Constant
patent: 4038539 (1977-07-01), Van Cleave
patent: 4207624 (1980-06-01), Dentino et al.
patent: 4283767 (1981-08-01), Rountree
Morgan et al., "Real-Time Adaptive Linear Prediction using the Least Mean uare Gradient Algorithm", IEEE Trans. on Acoustics, Speech & Signal Processing, Dec. 1976, pp. 494-507.
Burdic, "Detection of Narrowband Signals using Time-Domain Adaptive Filters", IEEE Trans. on Aerospace and Electronic Systems, Jul. 1978, pp. 578-591.
Dentino et al., "Adaptive Filtering in the Frequency Domain", Proceedings of the IEEE, Dec. 1978, pp. 1658-1659.
Thompson, "A Constrained Recursive Adaptive Filter for Enhancement of Narrowband Signals in White Noise", Conference Record of the Twelfth Asilomar Conference on Circuits, Systems and Computers, Pacific Grove, Ca., pp. 214-218, Nov. 1978.
McCool John M.
Widrow Bernard
Zeidler James R.
Beers Robert F.
Johnston Ervin F.
Malzahn David H.
Stan John
The United States of America as represented by the Secretary of
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