The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1976
Filed:
Mar. 07, 1974
Gustav Guanella, Zurich, CH;
Patelhold Patentverwertungs & Elektro-Holding AG, Glarus, CH;
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.