By studying on vital signs signal acquisition technique based on piezoelectric thin-film sensor. Wavelet transform and a new time-domain peak finding algorithm are used to obtain the heart rate and respiratory rate and the results are displayed in real time. Digital signal transmitted to the host computer is processed by wavelet analysis

and signal components of different scales are obtained and reconstructed to obtain heartbeat and respiratory waveform. With a method combines simple peak seeking with twice screening to obtain the body’s heart rate and respiratory rate. Real-time display waveforms with Lab VIEW

compare with the pulse oximetry measured pulse rate to verify its precision. The results show that the average error is within 4 % and higher accuracy of heart rate and respiration rate can be obtained by using the algorithm.