even more about joint stereo , from XingMP3 codec - 未名空间MITBBS历史存档

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even more about joint stereo , from XingMP3 codec

even more about joint stereo , from XingMP3 codec# Software - 软件世界

n*n2000-08-09 07:08

1 楼

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*d2000-08-09 07:08

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*d2000-08-09 07:08

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. :-