BIDIRECTIONAL PREDICTIVE CODING DEVICE AND METHOD, BIDIRECTIONAL PREDICTIVE DECODING DEVICE AND METHOD, AND PROGRAM AND RECORDING MEDIUM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a predictive coding device etc. capable of improving efficiency of coding of a sound signal, in particular, the efficiency of coding when a frame length is short.

SOLUTION: A prediction coefficient calculating section 120 performs linear predictive analysis on an input signal constituted of sample columns of time series by a frame unit constituted of a plurality of samples, to calculate a prediction coefficient, and a prediction coefficient coding section 130 encodes the prediction coefficient to output a prediction coefficient code. A linear prediction section 140, to which the input signal and the prediction coefficient corresponding to the prediction coefficient code are input, selects one of prediction direction of a forward direction or the reverse direction in terms of time within the frame, and outputs a prediction error column calculated by the prediction coefficient corresponding to the input signal and the prediction coefficient code by predicting the selected prediction direction, and information indicating the selected prediction direction. A prediction error encoding section 150 encodes the prediction error column and outputs the prediction error code column.

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