FreeView DTT Frequency Plan

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cyril7

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#16406 8-Oct-2007 15:55

Finally found the Nationwide channel allocation and site register.

DTT_UHF_Plan

Cyril

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#90163 8-Oct-2007 19:47

Good to see things are moving along
Does anyone know when it might be transmitting in Chch besides the "early 2008" it says on the Freeview site. I have a UHF aerial and also a DVB-T card I used in the UK and am wondering if its worth holding out for a few months to save installing a satellite.

ZollyMonsta

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#90173 8-Oct-2007 20:43

Unless your DVB-T card supports MPEG4, it will not work with the DVB-T service here.

Cheers,
ZollyMonsta

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sbiddle

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#90185 8-Oct-2007 21:23

It's interesting to see the only definite plans for Wellington are the Kaukau upgrade at this stage. There are large parts of Wellington that rely on translators for coverage so it will be interesting to see what the DVB-T coverage is like in places like Wainui and parts of Porirua.

Can somebody also tell me what SFN means?

"Wellington SFN Infill Cancel Otahoua Sky 53. Cancel Wither Hills Sky 29, 33, 53 & NZRB 57"

Surely having to move all those Blenheim channels would also cause a lot of drama as well but if sites like Fitzherbert and Porirua are required to be used there will be no choice.

cyril7

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#90203 9-Oct-2007 07:51

SFN, means Single Frequency Network. This is something that is pretty unique to COFDM modulatons schemes, that DVB-T uses. Essentially several near located Txs can use the same frequency, with the same modulation. The timing of each Tx is co-ordinated.

To any reciever that can see two or more SFN Tx's the loudest is what it will use the others appear as echos, or relections and will be at stightly different delays due to location. The nature of COFDM demodulation means that these delayed echos can be rejected and only the wanted is seen by the demod.

One of the modulation parameters that can be set in COFDM is the guard interval, which is essentially a frequency (thus timing) offset between COFDM carriers. Variations in this guard interval set what level of echo delay a demodulator can deal with, which can be both real echos from buildings/hills, or SFN transmissions of greater or less geographic seperation.

Cyril

sbiddle

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#90212 9-Oct-2007 08:33

So is the infill coverage something we are very likely to see or just something that has been planned for the future depending on coverage from Kaukau?

cyril7

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#90219 9-Oct-2007 09:26

Dunno, but I suspect the ? in the table indicate its a suck it and see. Get KauKau going, then look at what infill SFN or not is required. But knowing Wellingtons terrian, I suspect there will be plenty of suburbs using the DVB-S service.

Cyril

xlinknz

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#90253 9-Oct-2007 13:28

Yah I have line of sight of Kaukau probably 3-4kms as the crow flys

now to buy my usb 2 dvd-t adapter and then get the approriate mpeg4 codec hopefully my mere 2.4Ghz P4 can cope with the analogue signal

Cyril - do you expect like me the prices of HD capable TVs ie LCD & Plasma etc to come down somewhat in price when freeview starts marketing in the new year the wonders of HD over dvd-t ?

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cyril7

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#90256 9-Oct-2007 13:39

now to buy my usb 2 dvd-t adapter and then get the approriate mpeg4 codec hopefully my mere 2.4Ghz P4 can cope with the analogue signal

For the DVB-T channels you dont need many mips as you use the broadcasters encoder.

As for the cost of HD panels, doubt the presence of HD channels here will effect the international price of TVs.

Cyril

sbiddle

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#90257 9-Oct-2007 13:46

xlinknz: Yah I have line of sight of Kaukau probably 3-4kms as the crow flys

now to buy my usb 2 dvd-t adapter and then get the approriate mpeg4 codec hopefully my mere 2.4Ghz P4 can cope with the analogue signal

Based upon comments from people during the UK MPEG4 trial it may be pushing it. A high end P4 seems to be the bare minimum with a dual core being required for HD stuff.

cyril7

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#90258 9-Oct-2007 13:58

doh gotya, forgot the USB tuner has no mpeg4 decoder.

Cyril

sbiddle

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#90265 9-Oct-2007 15:00

Talking about HD stuff, I heard today that TVNZ plan to use 1080i for their HD stuff. Can anybody confirm this at all?

xlinknz

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#90268 9-Oct-2007 15:17

cyril7: doh gotya, forgot the USB tuner has no mpeg4 decoder.

Cyril

I thought it was just a matter of having a mpeg4 codec since it is software that will be doing the decoding ie not dependant on hardware decoders like the Hauppauge PVR series ?

xlinknz

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#90269 9-Oct-2007 15:17

sbiddle: Talking about HD stuff, I heard today that TVNZ plan to use 1080i for their HD stuff. Can anybody confirm this at all?

All the more reason to wait before buying a HD screen !

sbiddle

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#90273 9-Oct-2007 15:39

xlinknz:
cyril7: doh gotya, forgot the USB tuner has no mpeg4 decoder.

Cyril

I thought it was just a matter of having a mpeg4 codec since it is software that will be doing the decoding ie not dependant on hardware decoders like the Hauppauge PVR series ?

That'll work fine.

The only problem facing PVR users was the comment from Freeview last week thah HDCP would be enforced on HD content and that HDMI was essential. This could pose a few issues for PVR users wanting to view and record HD content and IMHO shows how brain dead the industry is. If people can't watch HD stuff they'll simply download their favourite shows in 720p.

upsilon

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#90276 9-Oct-2007 16:14

sbiddle: Talking about HD stuff, I heard today that TVNZ plan to use 1080i for their HD stuff. Can anybody confirm this at all?

Its going to be 720p,

Why did you choose the 720p standard?
It's the standard that's most compatible with the new flat panel display technologies, and 'progressive scan' the way the world is heading.
It's also the standard recommended by the European Broadcasting Union.

http://tvnz.co.nz/view/page/425827/1382873

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