<p>Provided is an audio decoding device capable of suppressing an information amount for a lost frame compensation process and encoding efficiency. In this device, a decoded sound source generation unit (203) generates a lost frame decoded sound source signal; a pitch pulse information decoding unit (204) decodes the pitch pulse position information and the pitch pulse amplitude information; a pitch pulse waveform learning unit (205) learns a pitch pulse learning waveform in the past frame in advance from the lost frame; a convolution unit (206) amplitude-adjusts the pitch pulse learning waveform according to the pitch pulse amplitude information, and convolutes the pitch pulse waveform into a time axis which has been amplitude-adjusted according to the pitch pulse position information; a sound source signal correction unit (207) adds or replaces the pitch pulse waveform convoluted into the time axis to the lost frame decoded sound source signal.</p>
申请公布号
WO2008007699(A1)
申请公布日期
2008.01.17
申请号
WO2007JP63814
申请日期
2007.07.11
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;KAWASHIMA, TAKUYA;EHARA, HIROYUKI;YOSHIDA, KOJI