Talk:Digital Audio Broadcasting
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This is the talk page for discussing improvements to the Digital Audio Broadcasting article. This is not a forum for general discussion of the article's subject. |
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Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
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DAB+ Bit Rates
I am not sure what it is like throughout the rest of the world but here in Australia, the bit rates for DAB+ radio are appalling, toppign 80kbit/s at most. While this article claims that AAC triples the efficiency of MPEG encoding, my experience is that the sound quality is still pretty poor at 64bit/s, even 80kbit/s, with MP3 encoding at 128kbit/s or more delivering superior sound quality.
Therefore is there is no objection I will add a section to this article under the bit on MPEG bit rates to cover AAC bit rates also, and highlight that to achieve sound quality better than FM then 128kbit/s is still required, with few stations offering this. — Preceding unsigned comment added by Supremedalek (talk • contribs) 02:11, 3 January 2011 (UTC)
- 80kbit/s is actually very high for DAB+ since the system is designed to operate using low bitrates thanks to the HE-AAC v2. Actually I am suprised that more radiostations doesn't use bitrates in the 32-48 region. Remember, this is radio. If you wan't to listen to music on your expensive HIFI equiptment, use a CD. When bitrates are up in the 80+ region you don't use the HE part(SBR) or the v2 part(Parametric stere). So just core AAC is used in your example. Kydyl (talk) 14:16, 14 January 2011 (UTC)
- I have made extensive personal use of HE-AAC in converting audio files for listening on my phone... I default to 40kbit but often find that gives unacceptable results on a good number of tracks and have to upgrade it, sometimes as high as 80k. In all cases there's a noticable quality drop from the high quality VBR MP3 sources, it's just a matter of how critical it is to the material in question. I'm not sure if I'd accept anything less than 96k for broadcast purposes, as the need for realtime encoding (lowering encoder efficiency) and the great range of material under consideration would cause a loss of transparency in too many cases.
- If the new broadcast standard doesn't provide at least as good a result as FM, and more preferably an improvement, then it doesn't count as progress in my eyes - should it? The local FM band already provides a good spread of programming across various genres, both national (BBC) and independent, including some rival indies that are pretty much carbon copies of each other with different names. You can already fit in a great many more stations at 128~192k, enough that many of them get a very sparing market share and disappear soon after launch because they can't get sufficient listener numbers to attract a break-even advertising payout. MP2 DAB has proven this already. Is there really a need to squash even more of them in at 80k, 64k or less? It smacks of greed more than an improvement of the public service. An advance for the sake of advancing.
- I recently bought my first DAB radio as it was in a clearance sale at a much reduced price. I only want it for 2 or 3 digital-only BBC & independent stations. I'm definitely under no illusions that I'm going to get better quality out of it for the also-on-FM stations than the old FM/AM set that lives in the bathroom... Partly because it doesn't strike me as a very high quality radio on the whole, but also because of the signal. 87.113.89.205 (talk) 17:53, 19 February 2012 (UTC)
- well, the fact that you are re-encoding MP3's will have a very negative effect on the audio. Then the AAC codec won't be able to analyse the audio material properly since it will be disturbed by the fact that a lot of the original content is removed and replaced with artefacts. One basic rule in audio and vide encoding is to never use one lossy encoding as the base for another lossy encoding. That will produce crap as you have discovered (even if the source "sounds" fine). Kydyl (talk) 10:45, 11 September 2012 (UTC)
Difference between DAB and FM
The sentence which begins "Whilst the RF medium alone is strictly analog..." is just asking for complicated misunderstandings. You can't specify a medium as being analogue or digital, it is irrelevant. Would you call a piece of paper an analogue medium ? If I draw a picture on it, maybe, but I could equally well write down a set of numbers to describe the picture.— Preceding unsigned comment added by 86.130.242.87 (talk • contribs) 02:37, 5 Mar 2006 (UTC)
DAB+ in Hungary
"Hungary is due to launch DAB+ stations in 2008..."
This sentence is now dated. I was not able to find any DAB+ rollout news in Hungary after a couple google searches. Anyone know the status?— Preceding unsigned comment added by Mburns (talk • contribs) 23:12, 15 Feb 2009 (UTC)
Stat out of date
The opening section states "As of 2006, approximately 1,000 stations worldwide broadcast in the DAB format".
I would suggest this stat is irrelevant now - although it would be interesting to know. Has anyone got an up to dtae figure? —Preceding unsigned comment added by 86.184.68.249 (talk) 18:22, 18 September 2010 (UTC)
DAB and pirate radio
The section about pirate radio is becoming less relevant as open source implementations of DAB/DAB+ transmitters are becoming available. There is still a need for specialized hardware to get a signal out but I would guess the first (London) DAB-using pirate isn't too far away (in my not so humble opinion).
--Khoos (talk) 21:02, 25 March 2012 (UTC)
Map data is outdated
At least for Poland. According to pl:Digital Audio Broadcasting there are DAB+ stations in Warsaw. Qndel T⁄ C 11:22, 29 March 2012 (UTC)
Aerial or Antenna
I came to this page looking for information about DAB aerials and why they are different from FM / VHF aerials. It seems odd to me to have a lot written about reception, but nothing about what you would use to receive. I understand that aerial length and the orientation of signal modulation is important. I don't understand why a telescopic FM aerial can't simply be used vertically and to the required length. Or maybe it can. From lots of Googling, I believe that a lot of people are put off car DAB by the use of substandard in-car aerials, blaming the DAB transmission rather than the aerial, so clearing up this point in this article could be useful to a lot of people. — Preceding unsigned comment added by 84.93.174.94 (talk) 16:28, 24 January 2013 (UTC)
Dab has a shorter wavelength than vhf signals between 88-108mhz cutting a dipole would help boost you reception for dab. — Preceding unsigned comment added by 86.15.5.178 (talk) 00:40, 14 May 2013 (UTC)
Denmark switching to DAB+
Denmark is going to be moving to DAB+ in 2014. All channels are going to be broadcasting in DAB+ by 1-December-2014.
Sources in Danish.
http://www.radioassistant.com/dk/2013/09/digital-radio-danmark-skifter-til-dab-i-2014/ http://www.kulturstyrelsen.dk/fileadmin/user_upload/dokumenter/KS/medier/radio/Digital_radio/Digiradioplan-2013-2019.pdf (this is the long term FM - DAB+ plan for Denmark)