Apparatus for the identification of feedback tapes in a shift re

Details Apparatus for the identification of feedback tapes in a shift re Apparatus for the identification of feedback tapes in a shift re

1973-07-09

1977-07-05

Birmiel, Howard A.

Telegraphy

Systems

Printing

235181, 328 37, 235 92SH, 3401461AV, 343 18E, G11C 1900, H04K 300

Patent

active

040341569

ABSTRACT:
A shift register generator feedback tap identification system in which a received code is fed to a register which detects when the code contains all 1's at which time a bit position counter and a variable tap shift register generator are reset and a null-filter is enabled. The bit position counter controls the tap positions of the variable tap shift register generator and the output thereof is fed to the null-filter which compares the received code with the code from the variable tap shift register generator.

REFERENCES:
patent: 3217297 (1965-11-01), Delugeau
patent: 3439279 (1969-04-01), Guanella
patent: 3598979 (1971-08-01), Moreau
patent: 3599209 (1969-10-01), Goodrich
patent: 3670151 (1972-06-01), Lindsay et al.

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