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|1. (WO2018105616) SIGNAL FEATURE EXTRACTION DEVICE, SIGNAL FEATURE EXTRACTION METHOD, AND PROGRAM|
|Applicants:||NIPPON TELEGRAPH AND TELEPHONE CORPORATION
|Title:||SIGNAL FEATURE EXTRACTION DEVICE, SIGNAL FEATURE EXTRACTION METHOD, AND PROGRAM|
The purpose of the present invention is to accurately identify an emergence position of a desired waveform pattern. This signal feature extraction device extracts feature peak values of waveform patterns from an output signal of a feature extraction filter which extracts waveform patterns of an input signal. A maximum value detection unit 1 stores the value of the output signal and a time index when the absolute value of the output signal is equal to or higher than a preset threshold value and a maximum value is acquired. A feature peak value selection unit 2 selects a feature peak value on the basis of the differences between a time interval between the stored time index and the time index of the feature peak value selected immediately before, and the average time intervals at which the feature peak values can occur, and the differences between the logarithmic amplitude and the phase of the output signal corresponding to the stored time index, and the average logarithmic amplitudes and the average phases which can be acquired by the feature peak values.