An Improved System for Noiseless Recording

A new system of noisless recording that makes it possible to increase the volume range considerably without introducing distortion has been developed. The sound waves are amplified and split into two halves by a special mask in the recording optical system. The two half-waves are recorded 180 degress out of phase on separate parts of the sound track. The reproducing system utilizes a photoelectric cell having two cathodes connected in push-pull. Ground noise is reduced to a minimum because only the area occupied by the the recorded waves is transparent, and when there is no modulation the track is completely back.

Print ISSN

0097-5834

Published

1934-07

Content type

Original Research

DOI

10.5594/J07441