Accession Number : ADD001734

Title :   Time Based Error Correction for Recording Systems.

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 : 04 Oct 1974

Pagination or Media Count : 17

Abstract : The patent application concerns a deflutter device for FM recording on magnetic tape which corrects for a varying time base error. Zero crossings from the outputs of a reference oscillator and a reference tone on a first tape track are compared by a flip-flop whose outputs is a pulse having a width corresponding to the time base error. The output pulse enables a binary counter to provide a digital output which is transformed to an analog voltage by a digital to analog converter. Zero crossings from a second tape track containing recorded data are detected and shifted by a delay multivibrator in accordance with the analog voltage thereby correcting for the time base error.

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

Subject Categories : Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE