Digital Flutter Reduction System.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 21, 1975
- Accession Number
- ADD001737
Entities
People
- Bernard Harris
- David J Hoffman
- Richard E. Defrancisco
Organizations
- United States Department of the Navy