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Originally Posted by Pob!
Well compression is the key - analogue broadcasts are not compressed at all, therefore (with a good signal) provide the best quality. Digital TV at present is analogous to MP3's, rather than CD's, as it is apparent that quality is lost. In fact the audio bitrate of didital TV is similar, or even lower than, a typical MP3.
Now if they do switch to Mpeg4, then so much the better - it's not exactly a new technology, and most of us have seen great quality XviD or DivX video. Suprised they did'nt switch to Mpeg4 ages ago. But even so, it is still a lossy compression. I'd like to see us moving forward, not backwards!
Pob!
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Digital TV will
always use lossy compression, unless some genius can come up with a lossless codec that can compress things to the same size.
Still, using lossy compression doesn't always mean the end result is crap -- you'd be *very* hard pushed to tell the difference between a JPEG picture and an uncompressed bitmap, for example, without a magnifying glass, yet the first may be just 10% of the size. Likewise, an MP3 encoded at 192kbps (with a decent encoder) is very difficult to differentiate from the original CD, and at 256k it's damn near impossible for most types of sounds.
I don't know where you get your claim that the audio bitrate is low for DTV. I don't know about satellite-sourced channels, but this is certainly not the case for channels taken from DTT.