Amateur talking pictures and recording (1933)

Record Details:

Title:
Amateur talking pictures and recording
Date:
1933
Publisher:
London : Sir Isaac Pitman & Sons, Ltd.
Volume:
Amateur talking pictures and recording
Leaf #:
00099
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 02, 2024
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TALKING PICTURES ST method of recording sound. Differences in loudness is recorded by difference in density of the sound track, while pitch is recorded as the number of dark to light variations per unit length of the film. Recording Sound on Film. Fig. 45 shows diagrammatically a method of recording a film. Here we find the microphone and valve amplifier coupled to a sensitive lamp bulb Fig. 42. Showing a Sound Film Loud-speaker which throws a narrow beam of light on the side of the film. According to the impulses given to the amplifier so does the intensity of light from the bulb vary, thus a sound track, of variable densitv, is produced on the edge of the film. For recording variable width sound track an arrangement shown in Fig. 46 is commonly employed. Here a lamp throws a beam of light on a small mirror contained in an oscillograph. This latter may be considered as being a very sensitive voltmeter or ammeter, which is coupled up to the microphone via the usual amplifier. From the oscillograph the reflected beam of light is thrown upon a