Telegraphy – Systems – Printing
Patent
1974-03-07
1976-07-20
Birmiel, Howard A.
Telegraphy
Systems
Printing
178 22, 79 15R, H04K 106
Patent
active
039707903
ABSTRACT:
Method and apparatus are disclosed whereby messages are encoded by message element exchangers which utilize a delay device for transposing selected pairs of message elements so that the first element of the pair undergoes a delay 2T and the remaining message element of the pair experiences no delay. Message elements not treated in pairs undergo a delay T. The delay T is an integral multiple of the duration of a message element (said elements preferably being of equal length T.sub.0). Transmitted messages which have undergone selective transposition are decoded in a similar fashion, whereby the undelayed message element of a pair undergoes a delay 2T, the remaining element of the pair undergoes no delay and messages elements not treated in pairs undergo a delay T.
Exchangers of dissimilar delay periods may be connected in cascade to enhance the number of possible delay displacements which message elements may undergo. Also exchangers may be adapted to utilize plural delay devices to provide for further permutation of message elements.
REFERENCES:
patent: 3188391 (1965-06-01), Raymond et al.
patent: 3657699 (1972-04-01), Rocher
patent: 3731197 (1973-05-01), Clark
patent: 3796830 (1974-03-01), Smith
patent: 3824467 (1974-07-01), French
Birmiel Howard A.
Durr Frank L.
Greene Orville N.
Patelhold Patentverwertungs & Elektro-Holding AG
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