Boots – shoes – and leggings
Patent
1989-10-10
1994-01-11
Cosimano, Edward R.
Boots, shoes, and leggings
364572, 36472419, G06F 1520, H04B 1504
Patent
active
052787770
ABSTRACT:
Efficient cancellation of AC power line interference from a signal received by electronic instruments, such as biomedical monitors, is obtained by efficiently estimating the magnitude and phase of the noise signal from the contaminated input signal in a digital signal processor. Each interfering noise component of known frequency is represented as a sinusoid composed of cosine and sine components having estimated amplitude parameters. These amplitude parameters are recalculated at discrete points in time in the digital signal processor to carry out substantially a Fourier integration on the input signal at the known frequency f.sub.0 of the interfering signal, with the integration being updated to the last sample. The integration can be carried out to allow the estimates to adapt to time varying amplitudes and/or phases of the interfering signals. Cancellation of the estimated noise sinusoid from the input signal results in an output signal substantially uncontaminated by the noise.
REFERENCES:
patent: 3889108 (1975-06-01), Cantrell
patent: 4228517 (1980-10-01), Constant
patent: 4537200 (1985-08-01), Widrow
patent: 4858199 (1989-08-01), Griffith
patent: 4878188 (1989-10-01), Ziegler, Jr.
Hush, et al. "An Adaptive IIR Structure for Sinusoidal Enhancement, Frequency Estimation, and Detection," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 6, 1986, pp. 1380-1390.
Roy, et al. "ESPRIT--A Subspace Rotation Approach to Estimation of Parameters of Cisoids in Noise," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 5, 1986, pp. 1340-1342.
Nehorai, et al. "Adaptive Comb Filtering for Harmonic Signal Enhancement," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-34, No. 5, 1986, pp. 1124-1138.
Eleftheriou, et al. "Tracking Properties and Steady-State Performance of RLS Adaptive Filter Algorithms," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-34, No. 5, 1986, pp. 1097-1110.
Rao, et al. "Adaptive Notch Filtering for the Retrieval of Sinusoids in Noise," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-32, No. 4, 1984, pp. 791-802.
Friedlander, "System Identification Techniques for Adaptive Noise Cancelling," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-30, No. 5, 1982, pp. 699-709.
Friedlander, "System Identification Techniques for Adaptive Signal Processing," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-30, No. 2, 1982, pp. 240-246.
Chan, et al. "A Parameter Estimation Approach to EStimation of Frequencies of Sinusoids," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-29, No. 2, 1981, pp. 214-219.
Plotkin, "Using Linear Prediction to Design a Function Elimination Filter to Reject Sinusoidal Interference," IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 5, 1979, pp. 501-506.
Widrow, et al., "Adaptive Noise Cancelling; Principles and Applications," Proceedings of the IEEE, vol. 63, No. 12, 1975 pp. 1692-1716.
Cosimano Edward R.
Nicolet Instrument Corporation
LandOfFree
Efficient cancelling of AC line interference in electronic instr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Efficient cancelling of AC line interference in electronic instr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Efficient cancelling of AC line interference in electronic instr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1635727