Apparatus for estimating filter coefficients

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G06F 1710

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active

057904405

ABSTRACT:
An apparatus for estimating filter coefficients operates in a system which includes a filter simulating characteristics of an unknown signal transmission system based on a signal provided to the unknown signal transmission system and a response signal produced from the unknown signal transmission system. The apparatus includes an accumulation calculating section for accumulating a product of the signal provided to the unknown signal transmission system and a difference between the response signal from the unknown signal transmission system and an output signal of the filter for a given time period. The apparatus further includes a square-sum calculating section for accumulating a square of the signal provided to the unknown signal transmission system for the given time period. The apparatus also includes an adjusting-amounts simulating section for simulating coefficient adjusting amounts of the filter based on a ratio of an output of the accumulation calculating section to an output of the square-sum calculating section. In the apparatus, coefficients of the filter are adjusted by using the coefficient adjusting amounts simulated in the adjusting-amounts simulating section.

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K Fujii et al., "A Study of the Availability of a `Polarized-x` Algorithm," (in Japanese) Technical Report of IEICE, DSP95-27, pp. 31-38, May 1995.
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K Fujii et al., A New Version of the NLMS Algorithm Suitable for Fixed Point Proceedings of the 4th International Workshop on Acoustic Echo and Noise Control, 21-23 Jun. 1995, Roros, Norway, pp. 75-78.

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