ENCODING METHOD DECODING METHOD FREQUENCY-DOMAIN PITCH PERIOD ANALYZING METHOD ENCODER DECODER FREQUENCY-DOMAIN PITCH PERIOD ANALYZER AND RECORDING MEDIUM

摘要

The pitch period in the time domain L corresponds to the time-domain pitch period codes of the acoustic signal in a predetermined time interval, and, in terms of the sample interval in the frequency domain corresponding to the pitch cycle L in the time domain interval to obtain a T _1, in terms of the interval T ₁ and in terms of determining a frequency-domain pitch period T from the candidate values including a value U × T ₁ of the integral multiple of the interval T _1, and in terms of the frequency-domain pitch period T to obtain a frequency-domain pitch period codes indicating whether the several times of the interval T ₁ . The frequency domain pitch period code is output so that the frequency domain pitch period T can be specified on the decoding side.