Re: DAB digital radio - Sharp FVDB1 £49.99 at Richer Sounds. Bargain?

Pierre PANTALÉON wrote:
> DAB sounds worse than FM a écrit :
>
>> But just look at the result of advances in technology:
>>
>> A 192kbps MP2 station on DAB requires 285 kHz of spectrum.
>> A 64kbps aacPlus station on DRM requires 20kHz of spectrum!!
>
> 10 kHz is just in AM to obtain good sound at 20,96 kbps in mono !
>
> With Band II perhaps can use low robust and use 72 kbps on 20 kHz, but
> is it with good reception condition ?
> it must be tested.


Oh, so already working systems now have to be tested, right? Does
anything ever please you? What did you say when France won the FIFA
World Cup? Did you say "ah, they could have played better, Thiery Henri
played crap"?


>>> Which system must be use in this condition ? The "best" will be
>>> always developping. so, nobody will never choose digital system.
>>
>>
>>
>> DRM is already operating today.
>
> yes below 30 MHz ...


It could work at higher frequencies *very* easily.


>>> PS : When I tell about DAB I think DMB evolution. Same broadcast
>>> network, so it's low cost evolution.
>>
>>
>>
>> No. If you talk about DMB then say DMB, not DAB.
>
> But it's compatible (DMB receivers can receive DAB programs).


But DAB receivers cannot receive DMB services....


>> Didn't TDF say in their submission to the digital radio public
>> consultation that they thought 128kbps was good enough for everything
>> apart from classical music?
>>
>> Face it, if you use DAB you will use 128kbps for music stations.
>
> I repeat, mp2 is old codec, but not so bad like you want we say every
> day.


Yes it bloody well is.


>> So, are you completely ignoring the DVB-H Validation Task Force
>> report???????
>>
>> http://www.dvb.org/documents/press-releases/DVB_pr128%20DVB-H%20Validation%20Final.pdf
>> http://webapp.etsi.org/action/PU/20050517/tr_102401v010101p.pdf
>
> I understand DVB-H must use QSPK modulation for mobile reception !


Totally incorrect. The bloody links I've just given show that 16-QAM CR
2/3 can be used on DVB-H with high-speed
reception!!!!!!!!!!!!!!!!!!!!!!!

For a doctor you seem to have an extremely bad memory because I've
already pointed this out to you on numerous occasions!!


> And no test realised for mode D (speed > 130 km/h)
> It's only a validited system not a tested system.


Validated is the same as tested. They carried out field trials. You know
ACTUAL mobile reception to validate the performance predicted by
simulation.


> Actually, DVB prove it can transmit information with DVB-H protocol.
> It doesn't say that DVB-H is ready for production.
> This is what I understand.


DVB-H is ready for production, but there's no point in going into
mass-production until there's actual services in operation. That's all
that DVB-H is waiting for, and I would expect that will start either
later this year or certainly by next year.


>> Correct. So don't suggest that 128kbps MP2 is good or ever will be
>> good.
>
> http://www.minidisc.org/French_tech/section17.html
> not the best but not the worst


sontest5.wav:

"the mp2 tiring in the acute ones with 320k and its quality becoming
intolerable starting from 128k. The mp3 still obtains good results with
32k and 64k compared to the mp2."

And if you want to test audio codecs, try testing music rather than
bloody train noises!


>> I don't see your point. It is true that aacPlus will improve over the
>> next few years, but that strengthens my argument against DAB because
>> MP2 is too old to improve by anything more than a tiny amount.
>> Improvements in audio codecs tend to happen early on in the codec's
>> lifecycle. MP2 is at the end of its lifecycle now, and it's just
>> about to go out of service (well, it should be going out of
>> service...).
>
> certainly.
> But I can bet that we will have the same debate about AAC+ when
> broadcast will want use 24 kbps in few years.


But when you can fit about 400 radio stations into a DVB-H multiplex if
you use 24kbps, so why would anybody ever want to transmit 400 radio
stations??


> At this time, we will can say that it's possible to broadcast more
> than 400 radios on 1 multiplex but sounds worse than FM ! ;)


I can't be bothered with this. For a doctor it seems surprising that you
seem incapable of rational thought!


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
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http://www.digitalradiotech.co.uk/mp3_players_large_capacity.htm


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