Boots – shoes – and leggings
Patent
1992-05-05
1993-12-21
Mai, Tan V.
Boots, shoes, and leggings
G06G 702
Patent
active
052726630
ABSTRACT:
Method and apparatus for adaptive filtering a first signal to produce a second signal that approximates a desired signal including an acoustic charge transport type programmable transversal filter (PTF) having a number of taps where each tap corresponds to an associated delayed first signal and each tap having means for providing a variable tap weight to modify the filter response. The first signal is coupled to the PTF and the output of the PTF produces the second signal. A summer compares the output of the PTF and the desired signal to produce an error signal. A programmable delay line has time delays programmable to integer multiples of the PTF tap spacing to provide a delayed version of the first signal, and a multiplier multiplies the error signal and the delayed input of the programmable delay line to produce a gradient signal. The gradient signal is filtered with an analog lowpass filter to produce a filtered gradient signal which in turn is converted to a digital signal by a low bandwidth analog to digital converter. A microprocessor implements a filtered gradient algorithm to update the PTF filter tap, load the new tap weight into the PTF, and reconfigure the programmable delay line to produce a filtered gradient for another tap. The comparison of the PTF output with the desired signal continues to develop an error signal and the adaptive process is repeated until the error signal becomes substantially zero which results in the second signal more closely approximating the desired signal.
REFERENCES:
patent: 4417317 (1983-11-01), White et al.
patent: 4633285 (1986-12-01), Hunsinger
patent: 4656601 (1987-04-01), Merritt et al.
patent: 4661923 (1987-04-01), Grudkowski et al.
patent: 4726035 (1988-02-01), Bullock et al.
Sondhi et al, "New Results on the Performance of a Well-Known Class of Adaptive Filters", Proc. of the IEEE, vol. 64, No. 11, Nov. 1976, pp. 1583-1597.
Feintuch, "An Adaptive Recursive LMS Filter", Proc. of the IEEE, vol. 64, No. 11, Nov. 1976, pp. 1622-1624.
Hoskins, et al. "Charge Transport by Surface Acoustic Waves in GaAs." Applied Physics Letters, vol. 41, Aug. 1982.
Kansy, et al., "Acoustic Charge Transport Signal Processors," Microwave Journal, Nov. 1988.
Gardner, "Learning characteristics of stochastic-gradient-descent algorithms: a general study, anaylsis, and critique" Signal Processing, vol. 6, pp. 113-133, 1984.
I. Chung and S. Ann, "On the asympotomatic analysis of the smoothed least mean square algorithm and the relation with other LMS-type algorithms," IEEE Trans. on Cir. and Sys. vol. 38, No. 12, pp. 1551-1554, Dec. 1991.
Hunsinger Billy J.
Jones Douglas L.
Mai Tan V.
The Board of Trustees of the University of Illinois
LandOfFree
Apparatus and method for wide bandwidth adaptive filtering does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for wide bandwidth adaptive filtering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for wide bandwidth adaptive filtering will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-313666