DocumentCode
1217013
Title
Periodic Variations of Pitch in Sound Reproduction by Phonographs
Author
Furst, Ulrich R.
Author_Institution
Russell Electric Company, Chicago, Ill.
Volume
34
Issue
11
fYear
1946
Firstpage
887
Lastpage
895
Abstract
Causes of recurrent variations of pitch frequently encountered in the reproduction of phonograph records, commonly called "wow," are discussed. Considerations for the design of an instrument to measure the magnitude of these variations are given, minimum requirements and limitations of the design of such equipment are presented, and an instrument for use with 78-revolutions-per-minute turntables built to meet these requirements is described.
Keywords
Audio systems; Communication equipment; Frequency modulation; Harmonic distortion; Instruments; Manufacturing; Phase modulation; Shape; Signal processing; Speech;
fLanguage
English
Journal_Title
Proceedings of the IRE
Publisher
ieee
ISSN
0096-8390
Type
jour
DOI
10.1109/JRPROC.1946.232588
Filename
1696994
Link To Document