Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Patent
1998-05-15
2000-11-21
Malzahn, David H.
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
G06F 1710
Patent
active
061516147
ABSTRACT:
An object of this invention is to provide an adaptive filter capable of reducing a convergence time and residual error even when there exists an interval having a small input signal power for a long time, and an adapting method thereof. The adaptive filter comprises a signal power monitoring circuit for receiving an input signal and outputs of delay elements and outputting a first stop signal for stopping tap position control and a second stop signal for stopping coefficient updating and a coefficient updating control circuit for receiving the second stop signal and an error signal outputted by a subtracter and outputting the error signal or zero to coefficient generating circuits as an updating signal. The signal power monitoring circuit calculates a sum of powers of all or part of signals of the delay elements, so that if the power sum is smaller than a first threshold, it turns on the first stop signal to stop the tap position control and if the sum is smaller than a second threshold, turns on the second signal to stop the coefficient updating.
REFERENCES:
patent: 5636151 (1997-06-01), Ikeda
patent: 5867486 (1999-02-01), Sugiyama
patent: 5951626 (1999-09-01), Duttweiler
Ikeda, S., "A Fast Convergence Algorithm for Adaptive Fir Filters With Coarsely Located Taps" Proceeding of International Conference on Acoustics, Speech and Signal Processing 1991, Speech and Signal, pp. 1525-1528.
B. Widrow, et al., "Adaptive Noise Cancelling: Principles and Applications", Proceedings of IEEE, vol. 63, No. 12, Dec. 1975, pp. 1692-1716.
J-I. Nagumo, et al., "A Learning Method for System Identification", IEEE Transactions on Automatic Control, vol. AC-12, No. 3, Jun. 1967, pp. 282-287.
S. Ikeda, et al., "A Fast Convergence Algorithm For Sparse-Tap Adaptive FIR Filters for An Unknown Number of Multiple Echoes", IEEE 1994, vol. III, pp. 41-44.
Malzahn David H.
NEC Corporation
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