Apparatus for reconstructing a binary bit pattern

Details Apparatus for reconstructing a binary bit pattern Apparatus for reconstructing a binary bit pattern

1976-03-15

1978-04-11

Sloyan, Thomas J.

Static information storage and retrieval

Information masking

Diffraction

350 379, G11C 1300

Patent

active

040841537

ABSTRACT:
A binary bit pattern is reconstructed from a block of analog signals corresponding to the number of known bit positions of the pattern being reconstructed. The analog signals, which may take the form of light intensity signals, vary in signal level with the binary level represented as well as with a characteristic which causes the signal levels of the analog signals to vary in a known manner as a function of bit position. In reconstructing the bit pattern, an output signal is developed having a value dependent upon that of at least one of the analog signals which has a known bit level reconstruction. This signal is used for providing a variable threshold having a value which varies in dependence upon the outut signal as modified by a modifying factor which varies in the known manner as a function of bit position. Bit decision circuitry includes a comparator for sequentially comparing the analog signals with the variable threshold to provide bit decision indications.

REFERENCES:
patent: 3188907 (1965-06-01), Trampel et al.
patent: 3720923 (1973-03-01), Chen et al.
patent: 3735374 (1973-05-01), Rembaut
patent: 3781830 (1973-12-01), Vilkomerson
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3872434 (1975-03-01), Durall et al.
patent: 3959784 (1976-05-01), Meier
patent: 3962681 (1976-06-01), Requa et al.

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