1962•Defense Technical Information Center (DTIC)Requires access
ON PERFECT ERROR-CORRECTING CODES
Selmer Martin Johnson
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Abstract
DESCRIPTORS: *Digital recording systems, *Magnetic recording systems, Magnetic tape, Digital systems, Electronic circits, Elec tronic equipment, Design, Computers, Printing. Low velocity magnetic data readout and techniques for magnetic tape digital recording and payback over a 7500 - 1 speed range are investigated. The report covers four main areas: specifiations, block diagram, tape transport, and preiminary laboratory investigation. Tentative specifications are made of the magnetic tape unit to be used for experimentation and demonstration of the techniques under investigation. The unit consists of a tape transport and asociated electronics for recording and playback wth teletypewriter equipment. The block diagram is given and discussed for each of four modes of operation. These modes are low-speed record, high-speed playback, high-speed record, and lowspeed playback. requirements are discussed for the tape transport including the parameters of available units and factors used in selecting the best tansport. A description of the testing planned during the preliminary laboratory investigation is given. This description includes specific testing of the tape transport, flux responsive circuit for use in low-speed playback, and playback-record techniques excluive of logic circuitry. 9autho)