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Methods of Calibrating Frequency Records

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3 Author(s)
Moyer, R.C. ; RCA Victor Division, Indianapolis, Ind. ; Andrews, D.R. ; Roys, H.E.

A frequency record cut in lacquer, while an FM calibrator was used to measure the amplitude of motion of the cutting stylus, was processed and calibrated by the following means: a "static" method in which the amplitude of the recorded groove was measured by means of a displacement sensitive gauge; a variable speed method in which the velocity was measured with a pickup while the same reproduced frequency was maintained by rotating the disk at different turntable speeds; the reflected-light-pattern method commonly used in evaluating the recorded velocity; and by direct measurement of the recorded amplitude as pictured in photomicrographs

Published in:

Proceedings of the IRE  (Volume:38 ,  Issue: 11 )