Accession Number : AD0865540

Title :   Study of Flutter in Magnetic Recording.

Descriptive Note : Final development rept. 1 Aug 66-31 Jul 67 on Phase 2,

Corporate Author : CONSOLIDATED ELECTRODYNAMICS CORP PASADENA CA DATA INSTRUMENTS DIV

Personal Author(s) : Wells, M. A.

Report Date : 20 NOV 1967

Pagination or Media Count : 129

Abstract : The effect of flutter in magnetic tape recorders of the type used to record data in instrumentation systems was studied. The report describes measurement techniques developed to measure flutter and time base errors. These techniques are used in making extensive measurements on two laboratory type recorders: one--a typical high-inertia recorder, the other--a low-inertia recorder with a high performance, phase-lock capstan speed control system. Flutter and time base errors are measured and flutter is analyzed to determine both the power spectral density and the amplitude probability density. Based upon these measurements it may be concluded that flutter is a random variable with normal amplitude probability distribution. The flutter energy is negligible at frequencies above 3 KHz on either recorder at any speed tested (3.75 ips through 120 ips). In fact, most of the energy is in a band from dc to 1.5 KHz. (Author)

Descriptors :   (*MAGNETIC RECORDING SYSTEMS, FLUTTER), MAGNETIC TAPE, PHASE LOCKED SYSTEMS, TIME, POWER SPECTRA, DISCRIMINATORS, FREQUENCY MODULATION.

Subject Categories : Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE