Patent ID: 8364474

Claim:
A signal encoding device for encoding a time-series signal, comprising: a partitioning section which partitions the time-series signal into plural subbands to generate a low-frequency subband signal including plural low-frequency subbands and a high-frequency subband signal including plural high-frequency subbands; a low-frequency encoding section which quantizes and encodes the low-frequency subband signal to generate low-frequency encoding data; a high-frequency gain information generating section which generates high-frequency gain information by generating a new high-frequency subband signal from the low-frequency subband signal and comparing the new high-frequency subband signal and the high-frequency subband signal of each subband; a high-frequency gain difference information generating section which generates high-frequency gain difference information by acquiring a difference value between the high-frequency gain information generated in each subband; a high-frequency gain difference information encoding section which quantizes and encodes the high-frequency gain difference information to generate high-frequency gain difference information encoding data; and a multiplexing section which multiplexes at least the low-frequency encoding data and the high-frequency gain difference information encoding data to output the multiplexed data as compressed data.