| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal extractor which reduces discrimination errors of an objective signal and miscellaneous signals and extracts the objective signal at high SN ratio. SOLUTION: The signal extractor comprises: at least one or more signal input means which receive signals from an objective signal source and a miscellaneous signal source; a signal feature level calculation means for calculating a signal feature level of a signal received by the signal input means; a weight value determination means which determines a weight valueαfor multiplying thereby the received signal, based on the value of the signal feature level calculated by the signal feature level calculation means; and a weight value multiplying means which multiplies the received signal by the weight value determined by the weight value determination means. As the signal feature levels, a dispersion value about the time base of cepstrum, a dispersion value about the time base of an auto-correlation function, sharpness are used as necessary. COPYRIGHT: (C)2007,JPO&INPIT
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