ENCODING METHOD, ENCODING DEVICE, PERIODIC FEATURE AMOUNT DETERMINATION METHOD, PERIODIC FEATURE AMOUNT DETERMINATION DEVICE, PROGRAM AND RECORDING MEDIUM

摘要

The present invention provides an encoding technique improving the quality of acoustic signals by low-bit encoding with low complexity. This encoding technique includes: interval determination processing that determines an interval (T) of a sample corresponding to the periodicity of an acoustic signal or an interval (T) of a sample corresponding to the integral multiple of the basic frequency of the acoustic signal for each of frames from among aggregation (S) of candidates for the interval (T); and auxiliary information generation processing that encodes the interval (T) determined by the interval determination processing to obtain auxiliary information. The interval determination processing determines the interval (T) by defining, as the aggregation (S), aggregation configured by (Y) number of candidates (where Y2) number of candidates (where Z2