Method and apparatus for determination of the state of an all-or-none modulated alternating signal in a perturbed environment
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United States of America Patent
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Nov 26, 1985
Grant Date -
N/A
app pub date -
May 13, 1982
filing date -
May 19, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The state of an all-or-none modulated useful signal subjected to a perturbed environment is determined, on reception, through the use of non-modulated reference signals subjected to the same environment. The reference signals have respective frequencies neighboring that of the useful signal and the same initial amplitude so that all of the signals are attenuated in the same manner by environmental perturbations. By comparing against a threshold reference value the differences between the respective amplitudes of the received reference signals and the amplitude of the received useful signal, the 'all' and 'none' states of the useful signal are accurately determined irrespective of the effect of perturbed environment on the amplitude of the useful signal.
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