Abstract
Laboratories and small manufacfacturers are frequently faced with the problem of accurately measuring the flutter content of sound recording equipment, but are not able to do so because of the cost and/or measuring limits of commercial flutter meters. Although flutter is basically undesirable speed variations of the recording medium due to imperfections of the mechanical drive system, the principal annoyance value that flutter causes is frequency modulation of the intelligence signal. This paper describes flexible and comparatively simple methods of measuring phase and frequency modulation effects caused by flutter and how these measurements can be used to determine quantitative and qualitative values of flutter.
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