Digital data reader

Details Digital data reader Digital data reader

1977-03-23

1979-05-15

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

235 92MP, 360 51, G06K 710, H04N 300, G06F 738, G11B 509

Patent

active

041543963

ABSTRACT:
The tape in a tape reader is braked to a stop relatively slowly instead of being stopped on one character. Two sprocket reading photocells are mounted on the tape reader to provide quadrature sprocket waveforms which are applied to a bi-directional sprocket counter coupled to the address conductors of a buffer memory. The data read off the tape by the tape reader is written into the buffer memory at the addresses indicated by the sprocket counter. An output pointer counter is also coupled to the buffer memory address conductors in parallel with the sprocket counter through a time division multiplexer. During the time interval in which the output pointer counter is connected to the buffer memory address conductors, data can be read out of the buffer memory at the address indicated by the output pointer counter independently of the sprocket counter.

REFERENCES:
patent: 3651310 (1972-03-01), Link
patent: 3793508 (1974-02-01), Maggi
patent: 3895184 (1975-07-01), Komura
patent: 3937927 (1976-02-01), Weigert
patent: 3941978 (1976-03-01), Huston
patent: 3967316 (1976-06-01), Suyama

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