movies SoundRec1943 2002-07-16 00:00:00 Encyclopaedia Britannica Films Explains the mysteries of sound recording on film. 1943 http://creativecommons.org/licenses/publicdomain/ B&W Sd prelinger 2002-07-16 00:00:00 N/A 0 10:15 HOW MICROPHONE TRANSFORMS KINETIC ENERGY OF AIR WAVES INTO ELECTRICAL ENERGY; HOW FLUCTUATIONS IN ELECTRIC CURRENT OPERATE PHOTOGRAPHIC LIGHT VALVE WHICH REGISTERS THEIR FLUCTUATIONS THRU VARYING LIGHT BEAM UPON SENSITIZED PHOTOGRAPHIC FILM; REVERSE. VARIABLE AREA & VARIABLE DENSITY SOUND TRACKS EXPLAINED & DEMONSTRATED. SOUND FILM PROJECTORS. Best scenes: 1) The narrator actually speaking the soundtrack to the film in real time, and 2) the end, where you can "see" a soundtrack. 06:42:11:00 - 06:43:05:00 VS man transferring motion-picture film from one reel to another; CU individual frames on film picturing woman, arrow pointing to her; arrow points to optical soundtrack on film; picture negative and sound negative side-by-side; diagram showing how negatives combine to create positive 06:43:05:00 - 06:47:23:00 VS man sitting at desk, talking into microphone (this is James A. Brill, the narrator for all of the ERPI Classroom Films, speaking); animated sound waves emitting from man's mouth to microphone; CU sound waves going into microphone; VS diagraming how sound moves from microphone to amplifier to recorder and onto sound track strip; VS diagramming various kinds of sound track strips and how light passes through; VS diagramming sound from amplifier to loudspeaker 06:47:24:00 - 06:50:39:00 Diagram of parts of light valve: ribbons, light slot, bridges, tensioning means; CU man looking through microscope; diagram of light valve ribbons (as seen through microscope); VS diagram of lens, apertures and ribbon slots, lens system and film; VS parts of light valve 06:50:39:00 - 06:51:03:00 MCU balding man with glasses, sitting behind desk talking toward microphone 06:51:03:00 - 06:52:26:00 Diagram what different types of soundtracks (variable density and varible area) look like as they run MICROPHONES SOUND WAVES ELECTRICAL ENERGY ELECTRIC CURRENT PHOTOGRAPHIC LIGHT VALVES SOUND RECORDING & REPRODUCTION Sound Sound recording Soundtracks Electronics Audio Physics Animation Science Microphones Film (animated) Soundtracks (animated) Announcers Narrators Speaking <BR> 2005-01-13 09:36:44 United States 1 0 Perception: Sound;Motion pictures: Sound;Motion pictures: Projection 1020 MovingImage 1943 01150