Society of Motion Picture and Television Engineers - Sound Recording with the Light Valve

Author(s): Donald MacKenzie
Publisher: Society of Motion Picture and Television Engineers
Publication Date: 1 September 1928
Volume: 12
Page(s): 730 - 747
ISSN (Paper): 0096-6460
DOI: 10.5594/J13132
Regular:

THE sound records I am about to describe are of the variable density type, and the method of making them is that developed by Bell Telephone Laboratories.

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