Record/Replay Performance of a Video Disc-Recorder System

Metadata

Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 79, No. 11, pp. 990–997
Abstract: Video recording on a magnetic medium can be optimized using analog-to-bi-level modulation. The video information is contained in the relative spacing between transitions of the bi-level modulation signal. Quality television displays require a signal-to-noise ratio of 40 dB or greater. Experience has shown that the signal-to-noise performance of a video disc recorder system is essentially that established in the replay of the bi-level signal from the disc. As discussed in this report, when the parameters of the head/disc interface are available for “adjustment,” it is important to have a better understanding of the relative effects of each parameter on the overall record/replay operation. By optimizing the record/replay performance of the head/disc combination, the overall system signal-to-noise capabilities are improved. Information has been derived and combined in this report to provide understanding of the significant parameters and their effect on the overall pulsewidth and bandwidth responses of the system. Factors of magnetic medium thickness, co-ercivity, remanence and self-demagnetization, head-to-medium separation and velocity, head gaplength and write-current risetime have been considered. The effects of these factors on the pulsewidth response of the record/replay channel are used to direct the optimizing of the disc-recorder system performance. Head-to-disc spacing and head gaplength emerge as the present state-of-the-art parameters which contribute most to the determination of the system's pulsewidth and bandwidth responses.
Publication Date: 1970-11-01
DOI: 10.5594/J13579
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J13579
Author(s): E. Troy HatleyVideo Division, Data Disc, Inc., 1275 California Ave., Palo Alto, CA 94304
Copyright: © 1970 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Hoagland A. S. Bacon G. C. , “High density digital magnetic recording techniques,” Proc. IRE : 258 – 267 , Jan. 1961 . EXTERNAL
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11. Hoagland A. S. , Digital Magnetic Recording , pp. 57 – 60 , New York : John Wiley and Sons , 1963 . EXTERNAL
2. Bonyhard P. I. , “A theory of digital magnetic recording on metallic films,” IEEE Trans. on Magnetics , Vol. Mag-2 : 1 – 5 , Mar. 1966 . EXTERNAL
3. Speliotis D. E. , “A Theoretical Analysis of Saturation Magnetic Recording,” IBM J. : 233 – 234 , May 1966 . EXTERNAL
4. Miyata J. J. , “The recording and reproducing of signals on magnetic medium using saturation-type recording,” IRE Trans. on Electronic Computers : 159 – 169 , June 1959 . EXTERNAL
5. Teer K. , “Investigations of the magnetic recording process with step functions,” Philips Res. Rep. 16 : 469 – 491 , Oct. 1961 . EXTERNAL
6. Chapman D. W. , “Theoretical Limit on Digital Magnetic Recording Density,” Proc. IEEE : 394 – 395 , Feb. 1963 . EXTERNAL
7. Mee C. D. , The Physics of Magnetic Recording , p. 222 , New York : John Wiley and Sons , 1964 . EXTERNAL
8. Karlquist O. , “Calculation of the magnetic field in the ferromagnetic layer of a magnetic drum,” Trans. Royal Inst. of Tech. : No. 86, Stockholm, Sweden, 1954 . EXTERNAL
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E. Troy Hatley; Record/Replay Performance of a Video Disc-Recorder System, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J13579

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E. Troy Hatley; Record/Replay Performance of a Video Disc-Recorder System, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J13579

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E. Troy Hatley; Record/Replay Performance of a Video Disc-Recorder System, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J13579

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<span class="citation">E. Troy Hatley; <cite>Record/Replay Performance of a Video Disc-Recorder System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970. Available at <a href="https://doi.org/10.5594/J13579" target="_blank" rel="noopener">https://doi.org/10.5594/J13579</a></span>

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E. Troy Hatley; Record/Replay Performance of a Video Disc-Recorder System, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970
doi: 10.5594/J13579
url: https://doi.org/10.5594/J13579

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E. Troy Hatley; <cite id="bib-10-5594-j13579">Record/Replay Performance of a Video Disc-Recorder System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 11, November 1970); SMPTE, 1970
<span class="doi">10.5594/J13579</span>
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