Method and device for encoding audio signal, and system for encoding and decoding audio signal

摘要: PROBLEM TO BE SOLVED: To surely suppress pre-echo noise and post-echo by more accurately generating a correction function to execute gain control. SOLUTION: A sub-band frame including an audio sample signal is divided into plurality of divisions, the absolute value peak each division acquired. (attack signal) quick sound rise discriminated, divisions between discriminated attack corrected before are amplified process signal, (release fall release attenuated thus occurrence prevented.