THis one is from Help file of Audiocatalyst, the one you may trust. 跟我想的一样,双声道单独编码可能破坏声像。其实稍微了解一下MPEG的原理 也能想到。
g*d
2 楼
In AC3 encoding, channals are rematrixed before encoding. Band level channel coupling is a common practice. It's just a different name for the same thing. The linear transforamtions used are reversible. That means you don't lose any entropy by doing the transformation. What you gained is a bit stream that is easier to handle.
g*d
3 楼
we are talking about different things. I was talking about the validity of the compression idea. you are talking about specific implementations. intensity stereo exploits stereophonic redundency by keeping the only energy envelope of left and right channel at high frequencies. if the encoder uses it where it's not designed for, sure there is going to be problems. I guess I can't tell the difference at that high bit rate most of the time unless the psychoacoustic model used is really lousy. :-