Recording of Variable-Area Soundtracks Using a Laser Light-Modulating Device

V. I. Glazunova, L. G. Tsifrinovich, L. I. Ezrokh

A quick-response light-modulating device would be useful for extending the frequency range possible in recording variable-area soundtracks. A laser light-modulating device based on a new principle has been constructed. The deflection angle of the laser beam is kept constant, independent of the level of the recorded sound signal; the variable-area soundtrack is produced by an optical shutter controlled by pulse-width-modulated signals. The block diagram and optical scheme of the device are given and its operation is explained. A laboratory unit is described and a recording obtained experimentally is illustrated. Several advantages of the new device are indicated.

Print ISSN
Published
1980-07
Content type
Original Research
DOI
10.5594/J00467