Complex signal demodulation and angular demodulation for non-contact vital sign detection
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United States of America Patent
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Aug 26, 2014
Grant Date -
Sep 23, 2010
app pub date -
Dec 8, 2008
filing date -
Dec 7, 2007
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Abstract
Methods for recovering a detected signal in non-contact vital sign detection are provided. According to one embodiment, a detected reflected signal from a non-contact vital sign detection system can be received and provided along I channel and Q channel signal lines. A complex signal S(t) can then be reconstructed from the I channel and Q channel signal lines through complex signal demodulation. A Fourier transform can be used to obtain the detected signal's spectrum for spectrum analysis. Angular demodulation can be used to recover the information corresponding to original body movement. The complex signal demodulation and angular demodulation techniques used to provide information to determine original body movement are capable of avoiding the null detection point without limitations on frequency tuning or channel selection.
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