Title:
【発明の名称】雑音消去方法及びその装置
Document Type and Number:
Japanese Patent JP2874679
Kind Code:
B2
Abstract:
A noise canceler of the present invention is of the type including an adaptive filter for generating a pseudo noise signal, subtracting the pseudo noise signal from a received signal to thereby output an error signal, and sequentially correcting the filter coefficient of the filter in accordance with the error signal. A second adaptive filter produces a second pseudo noise signal and a second error signal. A first and a second power mean circuit each calculates the signal power of the respective signal. A divider performs division with the resulting two kinds of signal power, so that a signal-to-noise power ratio is estimated. A comparator compares the estimated signal-to-noise power ratio and a delayed version of the same and outputs greater one of them as an extended signal-to-noise power ratio. A step size output circuit corrects, based on the extended signal-to-noise power ratio and reference noise signal power output from a power mean circuit, a step size used to adaptively vary the filter coefficient of the first adaptive filter.
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Inventors:
IKEDA SHIGEJI
Application Number:
JP1440997A
Publication Date:
March 24, 1999
Filing Date:
January 29, 1997
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H03H21/00; G10L21/02; H04B1/10; H04B3/23; (IPC1-7): H04B1/10; H03H21/00; H04B3/23
Domestic Patent References:
| JP6225381A |
Attorney, Agent or Firm:
Yanagi Kawa Shin