How to add sound to amateur films (1954)

Page scan 00070 from How to add sound to amateur films

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 #:
00070
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:
September 05, 2024
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In a magnetic recorder, the film, tape or wire passes through an intense magnetic field at the gap in the recording head. As the current through the recording head fluctuates, so the tape is locally magnetised with polarity, intensity and spacing depending on the sounds reaching the microphone. magnetisation of the tape would not be proportional to the recording impulses. When you want to play back a magnetic recording, you have only to turn a selector switch and pass the tape a second time through the same machine. On most machines, the electromagnet which previously recorded the impulses now serves to detect them. It is then called a record/playback head, or R/P head. As the magnetised portions of the tape pass by they induce in the record/playback head impulses which are feeble replicas of the original impulses. The amplifier which was first used for recording serves now to amplify these feeble impulses until they can operate a loudspeaker. Erasing Very often, the record/playback switch fulfils another purpose besides that of transferring the record/playback head from the output end of the amplifier to the input. It brings an erase head in or out of operation. As its name 66