Re: Anyone seen this?
- From: hwh <iimeeltje@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 30 Apr 2007 19:48:32 +0200
Richard Evans wrote:
As far as I can see it sells DAB+ as a way to cram lots more services into a multiplex, and says sod all about the possibilities for better audio quality. But then what do you expect with Quintin Howard being in chairman (or what ever) of World DMB.
It also suggests that using DAB+ will always require slightly lower bit rates because of the RS coding overhead. In reality however the addition of RS coding will allow broadcasters to reduce FEC encoding from Level 3 to Level 4 which would more than make up for the capacity used by RS coding. Hence this is only really an issue for broadcasters who are already using level 4, which is virtually nobody. I wonder if they deliberately made this part misleading so as not to shoot the old DAB system down any more than they absolutely had to.
And indeed they seem to focus on reducing cost for the broadcasters. More stations on a multiplex and lower signal levels thanks to the R/S coding. So they ignore the fact that they could have more stations and better quality. PL4A would give them the same reception as DAB at PL3 and more capacity, which is not important it would seem.
So they choose to have about 19 stations on a multiplex. With four multiplexes they aim for 76 stations. Which market can sustain that amount? Alternatively they fill up the capacity with DMB but DVB-H seems to be more efficient at multimedia broadcasting.
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