发明名称 |
AUDIO ENCODING DEVICE AND AUDIO DECODING DEVICE |
摘要 |
<p>Disclosed are an audio encoding device and an audio decoding device which reduce degradation of subjective quality of a decoding signal caused by power mismatch of a decoding signal which is generated by a concealing process upon disappearance of a frame. When a frame is lost, a past encoding parameter is used to obtain a concealed LPC of the current frame and a concealed sound source parameter. A normal CELP decoding is performed from the obtained concealed sound source parameter. Correction is performed by using a conceal parameter on the obtained concealed LPC and the concealed sound source signal. The power of the corrected concealed sound source signal is adjusted to match a reference sound source power. A filter gain of the synthesis filter is adjusted so as to adjust the power of a decoded sound signal to the power of a decoded sound signal during an error-free state. Moreover, a synthesis filter gain adjusting coefficient is calculated by using an estimated normalized residual power so that a filter gain of a synthesis filter formed by using a concealed LPC is a filter gain during an error-free state.</p> |
申请公布号 |
EP2128854(A1) |
申请公布日期 |
2009.12.02 |
申请号 |
EP20080710507 |
申请日期 |
2008.02.29 |
申请人 |
PANASONIC CORPORATION |
发明人 |
KAWASHIMA, TAKUYA;EHARA, HIROYUKI;YOSHIDA, KOJI |
分类号 |
G10L19/005;G10L19/00;G10L19/12 |
主分类号 |
G10L19/005 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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