Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1984-07-13
1986-07-08
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369125, G11B 700
Patent
active
045997152
ABSTRACT:
A method and apparatus is disclosed for the reproduction of a sound signal recorded on a variable density optical sound track negative, in which the amount of light transmitted through the sound track is related to its exposure by a predetermined relationship. Light transmitted through the sound track is transduced to an electrical signal having a magnitude which varies in accordance with the amount of transmitted light, and this signal is operated on by a function which is substantially equivalent to the inverse of the predetermined relationship to produce an output signal which directly corresponds to the exposure of the sound track. An adjustment mechanism is provided to eliminate distortion and to enable the production of an accurate output signal even when the relationship between the light transmission and exposure of the sound track is unknown. The prior art requirement of producing a print from the negative, with exacting and sometimes unknown characteristics, is eliminated by the use of a convenient electrical circuit.
REFERENCES:
patent: 4169219 (1979-09-01), Beard
patent: 4355383 (1982-10-01), Dolby
Frayne and Wolfe, Elements of Sound Recording, John Wiley & Sons, Inc., chapters 15 and 18, pp. 272-289, 334-359.
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