Abstract
The excellent table of phase frequency response characteristics and amplitude frequency response without time-lag were constituted by using High-frequency system and the clinical connection of each wave of normal ballistocardiogram pattern was better equipped and new findings about it were obtaind.
High-frequency ballistocardiograph apparatus with the spring of high stiffness and the connected shoulder brace and foot brace was also constituted.
The charcteristics of this apparatus are controlling of the motion of the body developping by ballistic force and direct body pick-up system.
It was possible to make a recording of the same clear pattern without time-lag as the low-f repuency system by this method.
And the 3-dimentional ballistocardiograph apparatus was described in detail.
