Trigger generation for digital modulation signal analysis
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United States of America Patent
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Jun 24, 2014
Grant Date -
Jul 12, 2012
app pub date -
Dec 17, 2010
filing date -
Dec 18, 2009
priority date (Note) -
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Abstract
A modulation error is detected every symbol data to generate a trigger signal. The present invention focuses that there are limited patterns of shifts from one symbol data to the next one of the digital modulation signal. Measured values of amplitude, phase and/or frequency of symbol data are latched and then values at the next symbol timing are predicted from the latched measured values using said feature. The predicted and measured values are compared at the following symbol timing. If the difference (error) is over an acceptable range, a trigger signal is provided which allows acquiring a modulation error by symbol data.
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