Title:
OPTICAL SOUND TRACK REPRODUCING APPARATUS FOR MOVIE FILM
Document Type and Number:
Japanese Patent JPS59177533
Kind Code:
A
Abstract:
Apparatus for reproducing motion picture photographic (optical) sound-tracks is disclosed in which significant information regarding track placement, slit illumination, azimuth and impulse noise is derived by dynamically processing and comparing the signals obtained by reading each half of a bilateral sound-track. In the illustrated embodiment a pair of detector elements (B and C) minotors the septum between two tracks in order to detect lateral film misalignment. The signals from these elements are amplified (24, 26), integrated (28, 30) and applied to LEDs (32, 34) which remain extinguished when there is correct alignment. When there is misalignment, one or the other LED lights up. The left and right channel signals are derived by adding the signals from the elements (B and C) adjacent the septum to signals from respective larger, flanking detector elements (A & D).
Inventors:
IWAN AARU AREN
Application Number:
JP4800484A
Publication Date:
October 08, 1984
Filing Date:
March 13, 1984
Export Citation:
Assignee:
DOLBY LAB LICENSING CORP
International Classes:
G03B31/00; G03B31/02; G11B7/003; G11B7/007; G11B7/085; G11B15/60; G11B33/10; (IPC1-7): G03B31/00; G03B31/02
Domestic Patent References:
| JPS4991404A | 1974-08-31 |
Attorney, Agent or Firm:
Yuzo Yamazaki
Previous Patent: JPS59177532
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