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In Reply to: Question on Dolby Digital (AC3) - is it recorded on videotape? posted by John C. - Aussie on May 01, 2004 at 16:50:40:
Pro-Logic is a decoding format, so it's not recorded on the tape. What's actually recorded is an analog Dolby Surround signal. It can be processed by various matrix surround decoding technologies, such as: Dolby Surround, Dolby Pro-Logic, Dolby Pro-Logic II, Dolby Pro-Logic IIx, Circle Surround, etc.The Dolby Digital / AC-3 signal has to be turned into an analog signal (D to A process) before it can be recorded to tape. However, there were some experiments early on to get Dolby Digital / AC-3 encoded onto tape via S-VHS decks. Since nothing ever came of it, I guess it either was abandoned or didn't work too well.
Follow Ups:
Hi JoeThanks for the reply but I'm still a bit fuzzy about what is going on. The time shift recording here is mainly from satellite digital decoders and a little from free to air analog. I use s-VHS recorders, one of which has a hard drive in it.
Analog audio playback is from tape or hard drive -> Meridian 861 processor and there is no doubt about getting pro logic II. However the other night I'd swear the audio was 5.1 as the signals from the rear seemed to be distinctly different left to right rather that an amorphous surround as with PLII. Imagination? Maybe.
One of the decoders has a digital out but obviously can only be used for direct viewing. I'll check out the TV stations to see if they are transmitting 5.1 at all.
John
Interesting times
S-VHS = Super VHS = a tape format (Who has an S-VHS tape deck with a hard drive in it?)S-video = separate video = Y/C = Y signal (luma) and C signal (chroma) are kept separate
I'm really not following you on this.
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