Signal feature extraction apparatus, signal feature extraction method, and program

A signal feature extraction apparatus for extracting a feature peak value of a waveform pattern from an output signal of a feature extraction filter that extracts a waveform pattern of an input signal, comprising:

• a local maximum value detection part that stores a time index and a value of the output signal when an absolute value of the output signal is equal to or more than a predetermined threshold value and takes a local maximum value;
• and
• a feature peak value selection part that selects the feature peak value on the basis of a difference between a time interval between the stored time index and a time index of a feature peak value selected immediately before and an average time interval at which the feature peak value can occur, a difference between an amplitude of the output signal corresponding to the stored time index and an average amplitude the feature peak value can take, and a difference between a phase of the output signal corresponding to the stored time index and an average phase the feature peak value can take.

A signal feature extraction method for extracting a feature peak value of a waveform pattern from an output signal of a feature extraction filter that extracts a waveform pattern of an input signal, comprising:

• a local maximum value detection step in which a local maximum value detection part stores a time index and a value of the output signal when an absolute value of the output signal is equal to or more than a predetermined threshold value and takes a local maximum value;
• and
• a feature peak value selection step in which a feature peak value selection part selects the feature peak value on the basis of a difference between a time interval between the stored time index and a time index of a feature peak value selected immediately before and an average time interval at which the feature peak value can occur, and a difference between a logarithmic amplitude and phase of the output signal corresponding to the stored time index and an average logarithmic amplitude and average phase that the feature peak value can take.

A signal feature extraction method for extracting a feature peak value of a waveform pattern from an output signal of a feature extraction filter that extracts a waveform pattern of an input signal, comprising:

• a local maximum value detection step in which a local maximum value detection part stores a time index and a value of the output signal when an absolute value of the output signal is equal to or more than a predetermined threshold value and takes a local maximum value;
• and
• a feature peak value selection step in which a feature peak value selection part selects the feature peak value on the basis of a difference between a time interval between the stored time index and a time index of a feature peak value selected immediately before and an average time interval at which the feature peak value can occur, a difference between an amplitude of the output signal corresponding to the stored time index and an average amplitude the feature peak value can take, and a difference between a phase of the output signal corresponding to the stored time index and an average phase the feature peak value can take.