HAEMADYNAMOMETER OF DIGITAL TYPE

摘要

PURPOSE:To reduce the cost and size of a haemadynamometer and to improve the reliability of the same by providing a built-in circuit for correcting the dispersion and compensating the non-linearity of the piezoelectric converting characteristics of a pressure sensor. CONSTITUTION:In a pressure converter 5 corresponding to a pressure sensor, the pressure is converted into electric signals, which are fed through a gate 6 to a counter 7. A dispersion correcting circuit 8 corrects a function resembling a reference bent line in accordance with the correcting code which is preset from the outside. A linear compensating circuit 9 converts the value calculated for a preset time by the counter 7 into a pressure level in accordance with that function. A pressure judging circuit 10 judges whether the pressure at that time is higher than 20 mmHg or not in accordance with the timing fed from a frequency divider 12 thereby to produce control signals. A body signal amplifier circuit 13 amplifies and standardizes the Korotkov's sounds collected by a microphone and feeds them to a signal judging and processing circuit 14 so that only the genuine Korotokov's sounds may be fed to a display control circuit 15 thereby to display the heighest and lowest blood pressures in a display circuit 16.