Thumbnail
Access Restriction
Subscribed

Author Baumann, D. M.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©1958
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract The results of an investigation of the use of photographic techniques for high-scanning-rate digital storage are presented.The most promising technique, that of utilizing a projection system and a rotating mirror, is described in detail. In this system, the binary-digital information recorded on a photographic medium in the form of spots is projected on a rotating mirror by a device similar to a common slide projector. The image reflected from the rotating mirror sweeps past a row of stationary photoelectric transducers and causes the transducers to “read” the stored information.Experiments conducted with a simple slide projector and a rotating mirror resulted in a reading rate of 250,000 cps, with a mirror speed of 3600 rpm and a memory pattern of 110 lines per inch.A system using a memory pattern that is 4 by 4 inches and that contains 16 × 10 6 bits of information, each bit being 0.0005 by 0.002 inch, is proposed. This information would be written in parallel channels, each approximately 40 bits in width and 4 inches in length. Schemes for reading each of the channels repeatedly and for reading the channels successively are discussed. The reading rate should be greater than 1 million words per second.
ISSN 00045411
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1958-01-01
Publisher Place New York
e-ISSN 1557735X
Journal Journal of the ACM (JACM)
Volume Number 5
Issue Number 1
Page Count 13
Starting Page 76
Ending Page 88


Open content in new tab

   Open content in new tab
Source: ACM Digital Library