Accession Number : ADD001737

Title :   Digital Flutter Reduction System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : DeFrancisco,Richard E ; Harris,Bernard ; Hoffman,David

Report Date : 21 Mar 1975

Pagination or Media Count : 24

Abstract : The patent application describes a digital flutter reduction system which corrects for a varying time base error in FM recordings on magnetic tape. Pulse transitions from the outputs of a reference oscillator and a reference tone on a first tape track are compared by a flip-flop whose output is a pulse having a width corresponding to the time base error. The output pulse enables a first counter to provide a digital output which is loaded into a second counter. Pulse transitions from a second tape track containing recorded data advance the second counter over a number of counts indicative of a correction factor. The pulse transitions of the recorded data are delayed in accordance with the correction factor thereby reducing the time base error.

Descriptors :   *Magnetic recording systems, Patents, Magnetic tape, Flutter, Reduction, Digital systems, Errors, Frequency modulation

Subject Categories : Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE