Time Based Error Correction for Recording Systems.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 04, 1974
- Accession Number
- ADD001734
Entities
People
- Bernard Harris
- David J Hoffman
- Richard E. Defrancisco
Organizations
- United States Department of the Navy