Direct Conversion of FM Magnetic Tape Data into Digital Form

Author

Berson, Alan S. ; Tai, John ; Pipberger, Hubert V.

Author_Institution

Veterans Administration Research Center for Cardiovascular Data Processing, Veterans Administration Hospital, Washington, D. C., and Georgetown University School of Medicine, Washington, D. C.

Issue

4

fYear

1971

fDate

7/1/1971 12:00:00 AM

Firstpage

281

Lastpage

288

Abstract

A system is described for decoding frequency-modulated magnetic tape data directly into digital form suitable for input to a digital computer. Included in the system is a very precise method used to compensate for flutter errors. The bypassing of standard demodulation, filtering, and analog-to-digital conversion permits a significant improvement in signal-to-noise ratio. This type of system is most advantageous when reproducing data from magnetic decks whose signal-to-noise ratios cannot be reliably expected to remain at a satisfactory level. Using electrocardiograms, it has been demonstrated that a real gain in the detection of low-amplitude waveforms can be achieved with this system as compared to conventional reproducing.

Keywords

Analog-digital conversion; Chirp modulation; Computer errors; Demodulation; Frequency modulation; Instruments; Linearity; Magnetic separation; Signal analysis; Signal to noise ratio; Computers; Tape Recording;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.1971.4502851

Filename

4502851