Method of and apparatus for identifying a system with adaptive f

Details Method of and apparatus for identifying a system with adaptive f Method of and apparatus for identifying a system with adaptive f

1994-12-28

1997-03-04

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, 379410, 379411, 36472419, A61F 1106, H03B 2900

Patent

active

056088043

ABSTRACT:
A method of and an apparatus for identifying a system which allow a filter coefficient to be updated accurately even if noise is mixed. The apparatus for identifying a system includes an adaptive filter for processing a reference input signal to produce an output signal, a subtractor for subtracting the output signal of the adaptive filter from an observed signal, a power estimating circuit for estimating the power of the reference input signal, and a step size determining circuit for determining a step size based on the estimated power of the reference input signal. The step size determining circuit generates a step size according to a function of the power of the reference input signal which monotonously increases if the power of the reference input signal is smaller than a threshold and monotonously decreases if the power of the reference input signal is greater than the threshold.

REFERENCES:
patent: 4939685 (1990-07-01), Feintuch
patent: 5475632 (1995-12-01), Sugiyama
Widrow et al., "Adaptive Noise Cancelling: Principles and Applications", Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975, pp. 1692-1716.
Nagumo et al., "A Learning Method for System Identification", IEEE Transactions on Automatic Control., vol. AC-12, No. 3, Jun. 1967, pp. 282-286.
Fukumoto et al., "Effects of Interrupting Coefficients Update on Learning Identification Method", Proceedings of the 1994 OIEICE Spring Conference vol. 1, p. 246.

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