Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Patent
1998-01-29
1999-11-02
Mai, Tan V.
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
G06F 1710
Patent
active
059788240
ABSTRACT:
A noise canceler of the present invention includes a signal-to-noise power ratio estimator to which a main signal and a reference signal are input. The estimator 10 estimates the sinal-to-noise power ratio of the main signal from the mean power of a desired signal contained in the main siganl and a mean power of a noise signal also contained in the main signal. In addition, the estimator estimates the signal-to-noise power ratio of the reference signal from the mean power of a desired signal contained in the reference signal and the mean power of a noise singal also contained in the reference signal. An adptive filter for estimating the noise signal of the main signal has its step size for coefficient updating controlled in accordance with the estimated signal-to-noise power ratio of the noise signal. On the other hand, an adptive filter for estimating the desired signal of the reference signal has its step size for coefficient updating controlled in accordance with the estimated signal-to-noise power ratio of the reference signal. Delay circuits are provided for compensating for a delay ascribable to a power averaging procedure which a signal-to-noise power ratio estimator executes to calculate the estimated siganl-to-noise power ratios.
REFERENCES:
patent: 4649505 (1987-03-01), Zinser, Jr. et al.
patent: 5278780 (1994-01-01), Eguchi
patent: 5608804 (1997-03-01), Hirano
patent: 5644596 (1997-07-01), Sih
Jin-ichi Nagumo, et al., "A Learning Method for System Identification", IEEE Transaction On Automatic Control, vol. 12, No. 3, pp. 282-287, Jun. 1967.
Bernard Widrow, et al., "Adaptive Noise Cancelling: Principles and Applications", Proceedings of the IEEE, pp. 1692-1716, Dec. 1975.
Mai Tan V.
NEC Corporation
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