发明名称 |
METHOD AND APPARATUS FOR RATE REDUCTION OF CODED VOICE TRAFFIC |
摘要 |
<p>A conversion entity and method for converting higher-rate speech parameters into lower-rate parameters including dimmed excitation parameters. The conversion entity comprises a first decoder configured to produce a target excitation from the higher- rate parameters, based on a first fixed contribution and a first adaptive contribution. The conversion entity also comprises a second decoder configured to produce a second adaptive contribution, and configured to selectably operate in a first or a second mode. In the first mode, the second adaptive component is generated based on the first fixed contribution for a previous frame, while in the second mode, the second adaptive component is generated based on a second fixed contribution for the previous frame. The second decoder operates in the second mode in response to a rate reduction request. A processing module determines the dimmed excitation parameters for generation of the second fixed contribution for the current frame, based on the target excitation and the second adaptive contribution.</p> |
申请公布号 |
WO2008037081(A1) |
申请公布日期 |
2008.04.03 |
申请号 |
WO2007CA01732 |
申请日期 |
2007.09.28 |
申请人 |
NORTEL NETWORKS LIMITED;BOUROKBA, LAKHDAR;YUE, PETER, H., S. |
发明人 |
BOUROKBA, LAKHDAR;YUE, PETER, H., S. |
分类号 |
G10L19/08;G01L21/00 |
主分类号 |
G10L19/08 |
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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