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This topic comprises 3 pages: 1 2 3
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Author
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Topic: The Random Questions Thread
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 12-16-2002 06:19 PM
quote: 1. Why are UK Cinema posters called 'Quads' are they 4 times the size of something? What?
I should know the answer to this one, but I can't remember. There used to be a lot of strange British paper sizes with odd names; they have largely been replaced by the metric 'A' and 'B' series sizes, but for a few purposes, such as posters, the old sizes survive.
quote: 2. IMAX sound is digtal. Does it have analog backup?
Dick Vaughan can probably give a fuller answer than me, but I'll have a go. Imax sound isn't always digital. The film print carries no sound track or time code. in the original system the sound was carried on a six track 35mm magnetic film running on a separate follower. Mounted on a shaft in the projector is an encoder which workes very like the devices inside a ball type mouse. This produces an output which represents the movement of the shaft, and therefore the number of frames run from a fixed starting point can be calculated. The sound follower is locked onto this signal, and the sound therefore stays in sync with the picture. Later IMAX installations have digital sound, but are often equipped with the analogue magnetic system as well. The digital sound is stored on a computer hard disc, onto which it is loaded from DVD-ROM discs supplied to the theatre. It is syncronised to the picture in the same way as the magnetic sound, i.e. basically by a frame count, and therefore, unlike DTS, is is not possible to remove damaged frames from the print, or the sound would be out of sync. Although many IMAX installations have both sound systems, only one of them would normally be in use at one time, the film would have either an analogue or a digital track, not both, so there is no backup.
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This topic comprises 3 pages: 1 2 3
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