A Dubbing Rehearsal Channel

Preparation of sound effects, music, and dialog tracks for dubbing requires accurate synchronization of each sound with the corresponding action. This is ordinarily accomplished by a preliminary step in which the synchronism of one sound-track at a time is checked against the action in a moviola, in which the picture is seen through a small viewing lens. — The image being small, the accuracy with which synchronism may be checked is not good. Hence this is followed by a final step, in which the synchronism of all tracks is checked during rehearsals in the dubbing-room proper. Owing to the ponderous character of the dubbing machinery the latter process is quite slow and laborious. This paper describes the form and use of a machine that permits accurate synchronism of the various sound-tracks with the corresponding action, but with all the mechanical freedom of the usual moviola. — The machine will accommodate six sound-tracks, with provision for controlling the output level from each, and may be instantly started, stopped, or reversed. The mechanical design facilitates threading and easy displacement of any sound-track by a known amount to bring it into synchronism. The action is projected upon a screen 4 1/2 × 4 feet in size, which enables accurate observation of the degree of synchronism attained.

Print ISSN

0097-5834

Published

1937-09

Content type

Original Research

DOI

10.5594/J17375