Pulse or digital communications – Repeaters – Testing
Patent
1978-11-15
1980-09-30
Birmiel, Howard A.
Pulse or digital communications
Repeaters
Testing
178 30, 178 69G, H04L 1720
Patent
active
042259622
ABSTRACT:
A mosaic printer is made secure from unauthorized interception of data by falsifying the needle drive pulse current magnitude and sequence so that electromagnetic leakage radiation cannot be used to determine the alphanumeric data being printed. This falsification is accomplished by a compensation device having compensators energized each print cycle in addition to the printer needle drives in a reciprocal or a pseudorandom manner. The compensators have current consumption characteristics nominally identical to the needle drives and produce substantially identical radiation pulses, making it impossible to correlate the radiated pulse format with the symbol being printed.
Georges Claude
Meyr Heinrich
Birmiel Howard A.
English James T.
Hasler AG Bern
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