Telegraphy – Systems – Printing
Patent
1975-01-29
1977-03-22
Birmiel, Howard A.
Telegraphy
Systems
Printing
178 22, 325 32, 235181, 178 691, H04K 102
Patent
active
040138372
ABSTRACT:
The specification discloses a voice scrambler technique wherein a voice signal is split into a plurality of discrete frequency sub-bands. A random code generator generates a randomized sequence of digital signals. A preselected first portion of each of the digital signals is utilized to control the rearrangement of the order of the frequency sub-bands according to a limited subset of all possible combinations of rearrangements of the frequency sub-bands. The limited subset is chosen to include only the most unintelligible of the possible combinations of rearrangements of the frequency sub-bands. A preselected second portion of each of the digital signals is utilized to control the random inversion of ones of the frequency sub-bands. The rearranged and inverted frequency sub-bands are then transmitted over a conventional voice communication line to a similar voice scrambler unit which operates in synchronism to rearrange and invert the frequency sub-bands to the original state in order to render the voice signal intelligible. The system includes a unique synchronism technique which automatically compensates for time delays in transmission and which allows tolerance of transmission errors. The system includes an alarm function which becomes operative upon the occurrence of a malfunction and also includes various other safety devices to prevent the transmission of uncoded voice data in case of a malfunction of the system.
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patent: 3167738 (1965-01-01), Westerfield
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patent: 3598979 (1971-08-01), Moreau
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patent: 3723878 (1973-03-01), Miller
patent: 3725689 (1973-04-01), Kautz
patent: 3760355 (1973-09-01), Bruckert
patent: 3777133 (1973-12-01), Beck et al.
Branscome Kenneth M.
Feath William M.
Goode George E.
Heizer Kenneth W.
Morgan Barrie O.
Birmiel Howard A.
Datotek, Inc.
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