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What are the 3 basic sound recording techniques?
Mechanical, phographic and magnetic
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What components are necessary to mechanically record sound?
A mic, an audio amp, a recording head, a stylus, and a recording medium, usually a vinyl disk.
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What components are necessary to play back a disk recording?
A playaback head, a stylus, an audio amplifer, and a loudspeaker.
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In the mechanical recording technique, what converts the mechanical movements into corresponding electrical signals which are applied to the audio amp?
The playback head into which the stylus is mounted
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What are the methos of recording sound photographically?
Variable area and bariable density recording
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How is the sound pattern recored in variable area recording?
By a small mirror mounted on a sensitive galvanometer
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What type of sound track has a constant density and varying width along one edge of film?
Variable area recording
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How is the sound pattern recorded in variable density recording?
By varying the densities of the image, which is valve, produced by light passing thru a special type of a light.
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What type of sound track has a varying density and a constant width along one edge of the film?
The variable density recording.
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How is the magnetic recorrding technique accomplished?
A permanent magnetic is magnetized in accordance with the pattern of the sound, as the recording medium is driven past a recording head.
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What is the recording medium in magnetic tape recording?
A flat, polyester coated, plastic tape
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What is a.c. biasing used in most magnetic recording?
To obtain a substantially linear relationship between the flux density in the recording medium and the magnetizing force.
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What is the state of flux pattern on the tape after the magnetic recording process?
It is proportional in the magnitude and direction to the signal being recorded.
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What is accomplished by the hih frequency a.c. signal that is fed to the erase head in magnetic recording?
It cancels the magnetic fields from a previous recording by completely disorienting the magnitc particles in the wire or tape
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What are the 2 types of phograph cartridges?
Ceramic or crystal cartridges and magnetic cartridges
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What are the two types of turntables?
single record player that requires manual record changing and the automatic record changer
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What is the purpose of the idler wheel?
Used to reduce rumble or uneven motion of the turntable.
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What is the speed of a turntable when the largest step of the drive wheel is in contact with the idler wheel?
The turntables max speed
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What is the largest single reason for the tape deck operators complaining about poor quality of reproduction?
Dirty tape heads
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What is used to clean the heads of a tape deck?
The tip of a cotton swab dipped in alcohol or in a commercial tape head cleaner.
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What is used to remove all traces of oil or dirt from belts and rubber tired drive wheels on a tape deck?
Alcohol
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What is the procedure for demagnetizing tape heads?
Remove head overs, plug in demagnetizer, bring tips of demag close to the head. slowly move demagnetizer up and down 3/4 times.
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How is bulk erasing accomplished?
Place the reel of tape on a bulk eraser, then subject tape to strong magnetic field
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What is the site II system?
Ships Information Training and Entertainment system which is a self contained package system which employs film/slide capabilities as well as audio and tv
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What is provided by the diplexer in the Site II system?
Enables the operator to project a film/slide presentation in a tv format by projecting the film/slide images on to a mirrior which is in turn focused on the lens of a tv camera.
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What are the 2 mode of operation for light level control?
Auto and manual
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What is the heart of the dipleexer?
A system of optics, mirrors and lenses
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What is used to clean the optics of a diplexer?
A soft lens tissue moistened with isopropyl alchohol
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What is used to clean the ND filter wheel and the mirrors and lenses of the diplexer?
Brush with soft camel hair bursh.
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What will exten the life of the roller and cam?
Putting a drop of oil on the microswitch roller and then wiping it off.
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How is the lens and sound drum optic cleaned?
With soft lens tissue and isopropyl alcohol
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What is an importanct face to consider when you are operating the slide projector?
The fact that is has NO lens.
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What should NOT be attempted when operating the dipliexer if you should plan to switch from the film projector to the slide projector?
Do not attempt to focus the film projector by adjusting the film tv cameras lens
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Why should you ensure that the caera of the GP-7 tv camera is not focused on a very bright light or bright object for extended periods of time?
Because the image will burn a spot on the tube
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What precaution should be taken when operating the VF-3510 camera?
Avoid prolonged exposure to brightly lighted objects or lights bc the image will persist or lag on the face of the tube.
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Whats the biggest difference between an audio recorder and a video recorder?
The number of amplifier stages required for a given ammount of gain.
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What is used to periodically clean the tape path of a video recorder to remove residue?
Isopropyl alcohol. (then degause)
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