发明名称 |
Multi-band spectral audio encoding |
摘要 |
An encoder includes a sampler that samples an audio signal and that generates from the samples a plurality of short blocks of sampled audio. Each of the short blocks has a duration less than a minimum audibly perceivable signal delay. A processor combines the plurality of short blocks into a long block. The long block is transformed into a frequency domain signal having a plurality of independently modulatable frequency indices. The frequency difference between adjacent indices is determined by the minimum duration and the sampling rate of the sampler. A neighborhood of frequency indices is selected so that the frequency difference between a lowest index and a highest index within the neighborhood is less than a predetermined value. Two or more of the indices are modulated in the neighborhood so as to make a selected one of the indices an extremum while keeping the total energy of the neighborhood constant. A plurality of frequency bands are so coded. A decoder decides that a bit or bits have been received if, in a majority of the frequency bands, the decoder detects a modulated index.
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申请公布号 |
US6968564(B1) |
申请公布日期 |
2005.11.22 |
申请号 |
US20000543480 |
申请日期 |
2000.04.06 |
申请人 |
NIELSEN MEDIA RESEARCH, INC. |
发明人 |
SRINIVASAN VENUGOPAL |
分类号 |
G10L19/02;G10L11/00;H03M7/30;H04H20/31;(IPC1-7):H04H9/00;H04N7/16 |
主分类号 |
G10L19/02 |
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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