ENCODING METHOD, DECODING METHOD, ENCODING APPARATUS, DECODING APPARATUS, PROGRAM AND RECORDING MEDIUM

摘要

In encoding, according to whether an index or indices representative of the degree(s) of the periodicity and/or stationarity of input time sequence signals satisfy a condition for indicating that the periodicity and/or stationarity is high or whether the index or indices satisfy a condition for indicating that the periodicity and/or stationarity is low, a switching is performed between numbers of bits that are to be assigned to a code corresponding to a noise or pulse sequence obtained on the basis of a prediction analysis of the time sequence signals included in a predetermined time interval, thereby obtaining the code corresponding to the noise or pulse sequence. In decoding, a switching is performed between methods for decoding the code corresponding to the noise or pulse sequence included in the code corresponding to the predetermined time interval on the basis of the same criterion, thereby decoding the code corresponding to the noise or pulse sequence, thereby obtaining the noise or pulse sequence corresponding to the predetermined time interval.