发明名称 |
ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS |
摘要 |
An apparatus for encoding an audio signal to obtain an encoded audio signal to be used by a decoder having a high frequency reconstruction module for performing a high frequency reconstruction for a frequency range above a crossover frequency includes, a core encoder for encoding a lower frequency band of the audio signal up to the crossover frequency, the crossover frequency being variable, and the core encoder being operable on a block-wise frame by frame basis, and a crossover frequency control module for estimating, dependent on a measure of the degree of difficulty for encoding the audio signal by the core encoder and/or a boarder between a tonal and a noise-like frequency range of the audio signal, the crossover frequency to be selected by the core encoder for a frame of a series of subsequent frames, so that the crossover frequency is variable adaptively over time for the series of subsequent frames. |
申请公布号 |
EP1334484(A1) |
申请公布日期 |
2003.08.13 |
申请号 |
EP20010983888 |
申请日期 |
2001.11.14 |
申请人 |
CODING TECHNOLOGIES SWEDEN AB |
发明人 |
HENN, FREDRIK;EHRET, ANDREAS;SCHUG, MICHAEL |
分类号 |
G10L13/00;G10L19/02;G10L19/18;G10L21/038;H03M7/30;(IPC1-7):G10L19/00 |
主分类号 |
G10L13/00 |
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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