How the films are projected?
Posted 26 August 2011 - 02:36 PM
i have many doubts about projection and its result.
1.how sound and image are synced in projection ?
2.we shot earlier silent pictures in 14-20fps,after sound came we been shooting film in 24fps for 90 yrs almost.But,According to edison theroy 50 frames is needed to eye not sense "vision flickr".How is this problem over come in projection when we have shot only half of the frames needed to avoid vision flickr?
Pls clear this doubts in simple terms
Posted 27 August 2011 - 09:09 AM
Posted 28 August 2011 - 01:50 AM
Posted 28 August 2011 - 09:55 AM
There are many sound-on-film formats, the classic one is variable area optical sound. See:
For systems where the sound is run separately, like DTS, I believe time code is used to keep the sound in sync with the print. See:
Posted 28 August 2011 - 12:28 PM
Dolby Digital (SRD) uses an optical digital code located between the print's sprocket holes.
Sony SDDS uses an optical digital code located outside the sprocket holes.
All of the above plus the analog variable area soundtrack are located in different areas outside the picture area of the print. As a result, a print can have all four systems, analog optical, SRD, SDDS, and DTS, on it. Each system's information is located around twenty frames offset from the picture itself to allow for the fact that their readers are not located exactly where the picture aperture is located. That offset is standardized for each system.
Image of a print with all four systems on it.
Posted 29 August 2011 - 10:00 AM
Each system's information is located around twenty frames offset from the picture itself to allow for the fact that their readers are not located exactly where the picture aperture is located. That offset is standardized for each system.
Not the case for DTS - it's printed with no offset from the frame to which it is synchronised. Instead the installer measures the offset between the gate the reader and then programs the DTS playback unit to simulate the offset.
Posted 29 August 2011 - 05:17 PM
OK great. Now please change your user name to your full name. It's one of the rules here.
My name is manigandan sundaram
Posted 04 September 2011 - 03:53 AM