1) Vascular sounds (so-called Korotkov sounds) which appeared in the deflating cuff were recorded in the data-recorded by the ceramic microphone and converted to the digital data.

2) Korotkov sounds were always appeared overlapping the pulse wave.

3) Our indices of　recognition for systolic and diastolic blood pressure by Objective Recording Method (Sasaki and Hasunuma, 8th World Congress of Cardiology, Tokyo, 1978) were suitable with regard to the　the spectrum analysis.

4) Sampling time of vascular sounds seemed to be suitable by 2 msec.

5) Time difference between the pulse wave and the Korotkov sounds (P-K time) was decreased by the deflating cuff pressure.

6) Hirosaki Blood Pressure Measurement System (HBMS) enables the objective recognition of the Korotkov sounds and produces the objective proof of blood pressure.