Communications: electrical – Selective – Interrogation response
Patent
1977-01-31
1979-05-22
Moskowitz, Nelson
Communications: electrical
Selective
Interrogation response
340 18FM, 340 18NC, 328127, 328128, 325320, G01V 140
Patent
active
041562291
ABSTRACT:
Binary bits that are represented by pulses are identified by circuitry that integrates a signal having a sequence of such pulses for the period of each bit pulse. At the end of the integrating period, the integrator level is stored, and the integrator is discharged. Storage and discharge are synchronized with the bit pulse rate by an oscillator whose frequency is varied until the integrator level is maximized. The presence of a bona fide signal bit is indicated by a predetermined integrator level. A false signal bit generated as part of the background noise will not endure long enough to cause the integrator to reach the predetermined level of a bona fide bit.
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Moskowitz Nelson
Murrah M. Lee
Sperry-Sun, Inc.
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