How to add sound to amateur films (1954)

Record Details:

Title:
How to add sound to amateur films
Date:
1954
Publisher:
London : Focal Press
Volume:
How to add sound to amateur films
Leaf #:
00092
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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Synchronising Tape and Wire We have seen already that magnetic tape is a cheap and convenient medium for recording commentaries, music and sound effects. We have seen also that it is the most difficult system with which to achieve perfect synchronisation. This is because, having no perforations, it must be driven by friction rollers. Therefore cumulative errors arise due to slippage and creep at the capstan and the dimensional changes of the tape. Similar problems arise in wire recording. When recording a commentary, precise synchronisation is not always essential. Careful scripting enables you to accept relatively large errors in timing. On the other hand, if you must refer to a particular shot, you can seldom accept errors exceeding two seconds. You therefore need some method of relating the speeds of film and tape or wire. Then, even if they do not remain perfectly in step, they will at least remain approximately synchronised. Synchronising systems are of three kinds, each of which may be automatic or may require manual control of the projector speed. 1. The projector speed is constant or synchronised to the mains. 2. The projector speed is governed by capstan speed. 3. The projector speed is governed by marks on the tape or wire. Of these, the first system is the easiest to apply, but only the last gives perfectlresults.