Adaptive filter capable of quickly identifying an unknown system

Details Adaptive filter capable of quickly identifying an unknown system Adaptive filter capable of quickly identifying an unknown system

1991-12-27

1993-09-14

Malzahn, David H.

Boots, shoes, and leggings

36472416, 3647242, G06F 1531

Patent

active

052455610

ABSTRACT:
In an adaptive filter formed by first through N-th delay elements connected in series to one another to define first through N-th taps, first through M-th coefficient circuits which are smaller in number than the delay elements and which produce first through M-th coefficient signals together with first through M-th calculated signals, an adder for summing up the first through the M-th calculated signals to produce an echo replica signal, and a subtractor for subtracting the echo replica signal from an echo signal to produce an error signal, a matrix switch circuit is arranged between the first through the N-th taps and the first through the M-th coefficient circuits and is controlled by a control circuit to adaptively select, from the first through the N-th taps, first through M-th taps connected as active taps to the first through the M-th coefficient circuits. The control circuit supplies the matrix switch with a matrix control signal which includes active tap numbers assigned to the active taps. A plurality of the active taps may be replaced by changing a replacement time interval determined by the control circuit with reference to a result of monitoring the error signal or the coefficient signals.

REFERENCES:
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patent: 4933891 (1990-06-01), Schenk
patent: 5050119 (1991-09-01), Lish
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J. Nagumo et al, "A Learning Method for System Identification", IEEE Transactions on Automatic Control, vol. AC-12, No. 3, Jun. 1967, pp. 282-287.
"Adaptive Signal Processing" published in 1985 by Prentice Hall, pp. 337-347.
S. Kawamura et al, "A Tap Selection Algorithm For Adaptive Filters", ICASSP 86 Tokyo (CH2243-4/86/0000-2979 1986), pp. 2979-2982.

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