| 摘要 |
<p>The present invention reduces the transmission information amount and reduces the processing amount in an encoding apparatus. An encoding apparatus (10) including: an MDCT unit (104) which transforms an audio signal inputted into a frequency parameter, for every predetermined time-frequency transformation frame length; and an MDCT coefficient encoding unit (105) which encodes the frequency parameter, the audio encoding apparatus including: a pitch cycle detection unit (102) which detects a pitch cycle of the audio signal; a framing unit (101) which frames the audio signal based on the detected pitch cycle; a waveform modification unit (103) which performs waveform modification on the audio signal framed based on the pitch cycle, in conformance with the time-frequency transformation frame length, and outputs the waveform-modified audio signal to the MDCT unit (104); and a multiplex unit (106) which multiplexes the frequency parameter encoded by MDCT coefficient encoding unit (105) and the pitch cycle, and outputs the multiplexed result as a bitstream.</p> |
