A sphygmogram measure method and device includes an upstream and a downstream
pressure
sensor arranged in accordance with the bloodstream direction to measure the pulse
pressure of two adjacent points on radial artery in the wrist. The pulse pressures
are processed and converted to analog signals by an amplitude filter circuit and
an adjusting circuit. The analog signal of upstream pulse pressure is converted
to a digital signal, which is stored in a digital signal process unit. The signals
of upstream pulse pressure and downstream pulse pressure are also transmitted as
a start signal and a stop signal respectively to a counter which measures the time
lag of a pulse wave passing through the two pressure sensors. The digital signal
process unit uses the digital signals of upstream pulse pressure and time lag to
calculate the digital signal of downstream pulse pressure.
