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The pitch period extraction methods of the audio signal, and the pitch period extraction device of the speech signal, the time axis compression system of the audio signal, the time axis extension unit of the audio signal, time-axis compression and expansion unit of the audio signal
The pitch period extraction methods of the audio signal, and the pitch period extraction device of the speech signal, the time axis compression system of the audio signal, the time axis extension unit of the audio signal, time-axis compression and expansion unit of the audio signal
In a voice signal pitch period detecting method for detecting the pitch period of an input voice waveform by taking a predetermined number of pitch periods on the basis of the input voice waveform of a predetermined time period, a voice signal pitch period detecting method is characterized by reducing, when the detected pitch period is not more than a predetermined reference value, the number of times of pitch period detecting processing by considering the pitch period of a waveform of a predetermined number of pitch periods subsequent to a waveform of the predetermined number of pitch periods detected the same as the currently detected pitch period. IMAGE
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