RELATIVE PHASE DETECTOR, RELATIVE PHASE DETECTING METHOD AND INFORMATION READING DEVICE
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United States of America Patent
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Issued Date -
Sep 13, 2012
app pub date -
Mar 29, 2010
filing date -
Mar 29, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
It detects the relative phase of two measured signals using two reference signals. The relative phase detector 1 comprises reference signal generator 11, beat signal processor 12 and detecting element 13. As for reference signal generator 11, a frequency interval generates two reference signals which are the same as the frequency interval of the measured signal of two above. The beat signal processor 12 generates two beat signals from the reference signal of two measured signals and two above, and generation does the multiplication signal of these two beat signals. It removes constant decided by detection system from the DC component of the multiplication signal, and detecting element 13 detects the relative phase of two measured signals.
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