Non-contact vital sign sensing system and sensing method using the same

  • US 8,754,772 B2
  • Filed: 04/26/2012
  • Issued: 06/17/2014
  • Est. Priority Date: 09/20/2010
  • Status: Active Grant
First Claim
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1. A non-contact vital sign sensing system, comprising:

  • a vital sign sensing module for sensing a vital sign of an object, comprising;

    a first antenna for transmitting a first transmission wireless signal to the object and receiving a first reflected wireless signal reflected from the object;

    a first voltage control oscillator (VCO) directly connected to the first antenna for outputting the first transmission wireless signal to the first antenna and receiving the first reflected wireless signal via the first antenna, and accordingly the vital sign sensing module is under a self-injection locking (SIL) mode;

    a frequency demodulation unit coupled to the first VCO for demodulating a frequency variation of the first VCO; and

    a signal processing unit coupled to the frequency demodulation unit and the first VCO for obtaining the vital sign of the object based on the frequency variation of the first VCO and for determining a first oscillation frequency of the first VCO; and

    at least one body movement interference cancellation module wirelessly coupled to the vital sign sensing module, for canceling a body movement signal of the object, wherein each body movement interference cancellation module comprises;

    a second antenna for transmitting a second transmission wireless signal to the object and receiving a second reflected wireless signal reflected by the object; and

    a second VCO directly connected to the second antenna for outputting the second transmission wireless signal to the second antenna and for receiving the second reflected wireless signal via the second antenna, and accordingly the at least one body movement interference cancellation module is under the SIL mode;

    wherein,the first antenna transmits the first transmission wireless signal to the second antenna of the at least one body movement interference cancellation module, and the first transmission wireless signal is received by the second VCO via the second antenna;

    the second antenna transmits the second transmission wireless signal to the first antenna of the vital sign sensing module, and the second transmission wireless signal is received by the first VCO via the first antenna; and

    accordingly a mutual injection locking (MIL) mode is achieved between the vital sign sensing module and the at least one body movement interference cancellation module.

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