Dynamic Mixing Frequency Impedance Measurement Method Based on DFT and Virtual Preference Vector
Huaxiang Wang · Dianzi xuebao · 2008
In order to obtain bio-impedance information in different frequency simultaneously,the bio-impedance measurement method in the condition of mixing frequency excitation is studied in this paper.The influence of energy leakage and fence effect of DFT to sine signal detection is analyzed,according to which the bio-impedance measurement technology based on DFT with virtual preference vector is presented.Finally,the compensation of virtual preference vector is certificated by the emulations and experiments.From the experimental results,the dynamic reaction of respiratory and sphygmus in different frequency can be manifested according to the human impedance measurement.