Speech processing method, speech processing apparatus, and non-transitory computer-readable storage medium for storing speech processing computer program

A speech processing apparatus for estimating a pitch frequency, the apparatus comprising:

• a memory;
• and
• a processor coupled to the memory and configured to
• execute a conversion process that includes acquiring an input spectrum from an input signal by converting the input signal from a time domain to a frequency domain,
• execute a feature amount acquisition process that includes acquiring a feature amount of speech likeness for each band included in a target band based on the input spectrum,
• execute a selection process that includes selecting a selection band selected from the target band based on the feature amount of speech likeness for each band, and
• execute a detection process that includes detecting a pitch frequency based on the input spectrum and the selection band.

A non-transitory computer-readable storage medium for storing a speech processing computer program, the speech processing computer program which causes a processor to perform processing for estimating a pitch frequency, the processing comprising:

• executing a conversion process that includes acquiring an input spectrum from an input signal by converting the input signal from a time domain to a frequency domain;
• executing a feature amount acquisition process that includes acquiring a feature amount of speech likeness for each band included in a target band based on the input spectrum;
• executing a selection process that includes selecting a selection band selected from the target band based on the feature amount of speech likeness for each band;
• and
• executing a detection process that includes detecting a pitch frequency based on the input spectrum and the selection band.