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

A speech processing apparatus comprising:

• a memory;
• and
• a processor coupled to the memory and configured to
• execute a conversion process that includes calculating a spectrum from a plurality of frames included in an input signal,
• execute a determination process that includes determining a speech-like frame from the plurality of frames based on characteristics of the spectrum of the frame,
• execute a learning process that includes specifying a fundamental sound based on a plurality of local maximum values included in the spectrum of the speech frame and learning a learning value based on a magnitude of the fundamental sound, and
• execute a detection process of detecting a pitch frequency of the frame based on the spectrum of the frame and the learning value.

A non-transitory computer-readable storage medium for storing a speech processing computer program that causes a processor to execute processing, the processing comprising:

• executing a conversion process that includes calculating a spectrum from a plurality of frames included in an input signal;
• executing a determination process that includes determining a speech-like frame from the plurality of frames based on characteristics of the spectrum of the frame;
• executing a learning process that includes specifying a fundamental sound based on a plurality of local maximum values included in the spectrum of the speech frame and learning a learning value based on a magnitude of the fundamental sound;
• and
• executing a detection process of detecting a pitch frequency of the frame based on the spectrum of the frame and the learning value.