Does DRM have a future?

[Roy Sandgren]

Hi Siber, i got a car radio reciver with dab and drm. RTL om 6095 can be great, but sometime lot of dropouts. I do live outside the target area wich is germany. In the target area the signal is much more stronger.
We intend to do tests from a TX in DRM wich will be a target area of scandinavia and 65 kW DRM and in the target area +55db/mw and much more.

[zfyoung]

The interleaver length of DRM is 2 sec. at most, so if the signal is consistently weak/ bad in 2 sec. drop-out is inevitable.

Best way to combat this defect is multi-frequency / synchronized
single-frequency network. But at the early stage of DRM roll-out, many
cash-strapped shortwave broadcaster are struggling to cover their
target area, I don't think they would bother to take measures to increase their signal reliability outside target of interest!

[Siber]

Friends, I tell about receiving in 1 -2 jumps , or 2000 and more kilometers.
The receiving distance of example that I showed is about 4000 km,

[PP5AZF-Ataliba]

I agree it is better to receive a low quality audio than not receive it. So the hdxRadio is well regarded here in Brazil, mainly in the VHF-FM band, to be simulcast IBOC. I do not like the IBOC system because it takes up more bandwidth than when the DRM is transmitting analog and digital at the same time lateral donors in the upper and lower central frequency.
The delay between the digital and analog is easy to solve. Just put a device
the receiver that can be triggered manually by the listener. This is easy to solve because the analog audio is always present, being received every time we're decoding the digital audio, only the eliminated because we do not want. When stop digital audio dropout, just play the audio line that is already present, but that is at the same time, ie, synchronized. The quality will decrease, but will never be muted.
I still remember that, in AM, we have filters DSB receivers and leave the PM with great audio fidelity.

Original text in portuguese

Concordo que é melhor receber um áudio de baixa qualidade do que não o recebê-lo. Por isso o HDRadio está bem cotado aqui no Brasil, principalmente na faixa FM-VHF, por ser simulcast IBOC. Eu não gosto do sistema IBOC porque ocupa mais largura de banda que o DRM quando está transmitindo analógico e digital ao mesmo tempo nas lateriais superior e inferior da frequencia central.
O atraso entre o digital e o analógico é fácil de resolver. Basta colocar um dispositivo
no receptor que possa ser acionado manualmente pelo ouvinte. Isso é fácil de resolver porque o áudio analógico está sempre presente, sendo recebido todo tempo que estamos decodificando o áudio digital, apenas o eliminamos porque não o queremos. Quando interromper o áudio digital por falha de sinal, basta reproduzir o áudio analógico que já está presente, mas que está no mesmo tempo, ou seja, sincronizado. A qualidade diminuirá, mas nunca ficará sem áudio.
Lembro ainda que, em AM, poderemos colocar filtros DSB nos receptores e que deixarão o áudio AM com muita fidelidade.

[Roy Sandgren]

Hi folks around the world,
some positive news from Sweden. The new proposal of analouge and digital radio will issue new am,fm,dab+,drm and drm+ licences after 1 of July 2010.
Digital licences, criteria only. Analouge licences, criteria and bids.
Below 30 MHz, all broadcasting bands, am or drm. DAB+ in band lll + L-band.
DRM+ in band l and ll.

[mitajohn]

For your info: http://radioworld.com/article/94184

[Roy Sandgren]

What did I told you all??? It's comming up step by step and the new eurolaw says that you are free to broadcast in all broadcasting bands below 30 MHz, in AM/DRM.Sweden will open it up 1 of July to applications.
Russia and India got DRM as new standards, but it will take some years to get rid of all old high power consution TX's AM mode. In vehicles drm is great.

[mitajohn]

Hi all,

I found this for your info: http://radioworld.com/article/94184

[mitajohn]

Hi all,

This is for info: http://www.rwonline.com/article/97668

[mitajohn]

Hi all,

This is for your info: http://www.prosoundnewseurope.com/we...rate-drm-video