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EAC3 bit stream syntax允许在single bitstream中存在time-multiplexed substreams. 在EAC3的signle bitstream中,允许signle program大于5.1 channel,最大5.1ch的multi-program,或者5.1ch program和大于5.1ch program的混合. 一个EAC3的bitstream,必须包含至少一个independent substream. EAC3 bitstream可以o…
1.Spectral extension简介 Spectral extension是通过低频的transform coefficients合成高频transform coefficients的过程. spectral extension的实现与channel coupling类似,但是由于只需要transmit一些用于合成高频transform coefficients的metadat,因此比coupling更能减少datarate. 而且spectral extension能用于mono si…
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1.overview 当使用Spectral extension时,channel中的高频部分的transform coefficients由低频部分合成. transform coefficients合成包括:copy低频部分的transform coefficients insert到高频部分,作为高频部分的transform coefficients. inserted transform coefficients与pseudo-random noise做blending, scaling…
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