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#21
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Re: Difference between 5.1 and 5.1 discrete
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Well, I do have good news for you: Minister is right. An AC3 by itself isn't "discrete", but - it decodes into discrete channels. It's semantics. You can put it to a rest. |
#22
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Re: Difference between 5.1 and 5.1 discrete
What Tom said initially.
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#23
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Re: Difference between 5.1 and 5.1 discrete
Then interleave is not discrete
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#24
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Re: Difference between 5.1 and 5.1 discrete
You're funny.
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#25
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Re: Difference between 5.1 and 5.1 discrete
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The term "discrete" is one of two basic terms used to describe the channel encoding of various surround sound formats. Surround sound channels are encoded as either "discrete" channels or as "matrixed" channels, although the Dolby Digital EX format uses a combination of both. AC3, DTS and Dolby E are discrete formats, Dolby Surround and Dolby Pro Logic are matrixed formats. Answering the OP; there is potentially a difference between 5.1 and 5.1 discrete. There are a number of different 5.1 formats and to the best of my knowledge they are all discrete except for Dolby Pro Logic II (which is matrixed). So in theory there could be a difference between 5.1 and 5.1 discrete. If you have a delivery spec requiring 5.1 or 5.1 discrete, I would make a phone call and clarify what exactly they want. The terms "5.1" and "5.1 discrete" both describe groups of surround formats rather than a specific required delivery format. Delivery specs sometimes seem to be written by admin staff and are often vague and sometimes even contradictory. G |
#26
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Re: Difference between 5.1 and 5.1 discrete
Greg,
I can not agree with you. When a client asks for 5.1 discrete they are asking for a digital copy of the original 5.1 sound Mix NOT an AC3, matrixed or anything such as that. The reason for asking for the discrete is for archiving or creation of other elements such as a AC3. You don't hand a client a compressed format when they ask for discrete. Yes the Dolby Digital track is discrete tracks but it is a compressed format. Unless specifically requested that is the way deliverables are specifically spelled out.
__________________
Marti D. Humphrey CAS aka dr.sound www.thedubstage.com IMDB http://www.imdb.com/name/nm0401937/ Like everything in life, there are no guarantees just opportunities. |
#27
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Re: Difference between 5.1 and 5.1 discrete
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Discrete channels for playback. Discrete files, ie uncompressed 5.1 files. Dolby does describe Dolby Digital as, containing up to six discrete channels of sound. I think the difference in what we are all talking about here is discrete in delivery to the client, and discrete channel playback from whatever medium. AC3 plays back your 6 channel mix. Your client gets 6 audio files, uncompressed, that can be turned into any encoded file for discrete 6 channel playback. |
#28
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Re: Difference between 5.1 and 5.1 discrete
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I think the difference is between the dictionary definition of the word "discrete" and the audio term "discrete" as employed by Dolby. As Lexaudio mentioned, Dolby themselves describe DD as six discrete channels. I have always taken discrete to basically mean "not matrixed" and therefore the term "discrete" does not by itself define the delivery format. I agree with you though, I too have had clients ask for discrete 5.1 and I generally assume they are unaware of the audio terminology, are using the word discrete as per the dictionary definition and actually require 6 individual audio files. I would never deliver anything in a compressed format unless I was absolutely certain that's exactly what the client wanted. If the specs just asked for 5.1 discrete (without providing more information), I personally would make a call to clarify, just in case they want delivery on a DTRS! Although the implication these days is for 6 bwavs, they might want AIFFs or even a poly wav! I'm not going to argue with someone of your experience and knowledge though Marti and I'm willing to accept that I've got my terminology wrong for all these years. I just need a tiny little bit more persuading G |
#29
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Re: Difference between 5.1 and 5.1 discrete
I think we're all agreeing, you just don't realise it yet :-P
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