Document Type and Number:
Japanese Patent JPS50831
Kind Code:
A
Abstract:
If a cine film is to be projected to the accompaniment of a sound track on a separate tape it is necessary to cheek that the film and the sound track are correctly coordinated. This is ensured by reading a code mark from the sound track and using it to slow or stop the motion of the film. The point at which the film motion is slowed or stopped is used to evaluate the relative position of the film with respect to the sound track and thus check that correct coordination is present. This evaluation may take place visually or automatically. In the latter case the prolonged presence of a correlation marking on the film in a sensing position can be used to signal the existence of correlation whereas the absence of such marking may energize a warning lamp or deactivate the film drive.
Application Number:
JP12813973A
Publication Date:
January 07, 1975
Filing Date:
November 14, 1973
Export Citation:
International Classes:
G03B31/00; G03B31/04; (IPC1-7): G03B31/04
Domestic Patent References:
| JPS4723936A | ||||
| JP30000030A |
Next Patent: JPS50832