#1003070 - 07/29/05 03:33 PM
SPDIF
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richiejazz
Senior Member
Registered: 06/03/05
Posts: 39
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Can you get spdif sound (ie DOLBY DIGITAL) from tv cards. If so should it automatically flash up dolby on the amp when a film or dolby program comes on????
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#1003071 - 07/31/05 05:00 AM
Re: SPDIF
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Neil Wilkes
Gold Member
Registered: 07/06/02
Posts: 514
Loc: London, UK
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This is going to depend on where you are recieving the signal from.
If you are getting a digital signal, not an analogue one, then you may well indeed get true Dolby Digital Audio when it is broadcast. And if this is the case, then the decoder should indeed light up.
If you are on an analogue feed though, or your Audio is analogue, then the best you can hope for is Dolby ProLogic II.
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#1003072 - 07/31/05 06:04 PM
Re: SPDIF
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richiejazz
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Registered: 06/03/05
Posts: 39
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Ah right....thankyou.
At the minute ive got a desktop pc (with 5.1 & decoder) and a vaio laptop (with docking station and tv aerial input) in the same room. Here I have an optical cable connecting my laptop with the optical input on my pc's external decoder thus getting my laptops sound through decent speakers.
So to get proper surround would i need an alternative to the tv aerial input? i.e sky digital??
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#1003073 - 08/01/05 06:12 AM
Re: SPDIF
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Neil Wilkes
Gold Member
Registered: 07/06/02
Posts: 514
Loc: London, UK
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Sort of.
The sound coming from the Coaxial aerial socket is probably monophonic analogue. It may be stereo, I do not know for sure. If it is stereo, it may still be ProLogic II or Dolby Surround encoded. Let me try to explain the different possibilities to you:
1/. From a stereo analogue sound source.
(As found on everything except the Sky Plus service)
Your audio feed from the box is a straight analogue stereo option. This format can also act as a carrier for matrixed, or analogue surround formats such as Dolby Surround or Dolby ProLogic or ProLogic II, as well as SRS Circle surround too. These are matrixed formats that are folded down into Lt/Rt streams for delivery, and will decode nicely in DPL II decoders. If you have several options on your amp, try DPL II first as it is backwards compatible with all earlier versions.
2/. From a digital source, such as Sky Plus.
Anything that has either a lightpipe feed or a digital xoaxial feed can carry either a digital surround signal, such as Dolby Digital, or even a matrixed version such as DPL II mentioned earlier.
Dolby Digital decoders are also fully compatible with DPL II, so you would not need to switch around the decode options once set up - just set up as DD Surround, and leave alone - all will work as intended.
Best of all though is that when using these modes from the right sources, you can feed a straight stereo signal into A DPL II decoder, and it will oblige you by actually giving you an analogue 5.1 output that will, in most cases, decode quite nicely into surround.
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