Boots – shoes – and leggings
Patent
1981-02-13
1984-07-03
Gruber, Felix D.
Boots, shoes, and leggings
333150, 364821, 364861, 375 14, G06G 7122, G06G 719, H03H 2100
Patent
active
044583281
ABSTRACT:
An analog adaptive filter for deconvolving distorted signals. A clipped vion of the least mean square algorithm is implemented in a first embodiment by placing an acoustic surface wave storage correlator in a feedback loop and performing an iterative two step process to adjust the weight function of the correlator to make the output of the filter converge to a desired signal. In the first step, the distorted signal is applied to the top plate port of the storage correlator and the filter output from the acoustic port is delayed and subtracted from a training signal to produce an error signal. In the second step, the error signal is applied to the top plate port and the distorted signal is applied to the acoustic port which results in the correlation of the acoustic signal and the plate signal being added to the weight function stored in the storage correlator. The two step process is repeated until the filter output from the plate port converges to an approximation of the training signal. The filter may then be used to deconvolve other signals which have undergone a similar distortion. In a second embodiment which does not require switching, the error signal is coupled to the second acoustic port to provide the feedback signal. In a third embodiment, the filter is used as an interference canceller.
REFERENCES:
patent: 4075706 (1978-02-01), Stern et al.
patent: 4101965 (1978-07-01), Ingebrigtsen et al.
patent: 4124828 (1978-11-01), Bert
patent: 4247903 (1981-01-01), Grudkowski et al.
patent: 4333158 (1982-06-01), Voorman
Behar David
Bowers John E.
Kino Gordon S.
Olaisen Hermund
Curry Charles D. B.
Daubenspeck William C.
Gruber Felix D.
Sciascia R. S.
The United States of America as represented by the Secretary of
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