脳波の瞬時周波数スペクトル分析装置

抄録

The apparatus analyzes the electrorencephalogram spectrum in the short time interval. The characteristics of this apparatus are as follows: (1)The signal current is recorded into magnetic tape employing the boundary displacement type magnetic recording. The recorded magnetic tape can be developed by mean of spreading iron powder over the tape surface. It is possible to visualize the signal waveform after development and thus, to determine the time interval precisely during which the signal should be analyzed. (2)The selected interval is reproduced repeatedly by a variabl speed rotating magnetic head. By this method, the signal frequency is analyzed over this interval. (3)In the case where the signal is recdrded on paper by electroencephalograph, the necessary part of the recorded signal can be recorded into magnetic tape by use of the pantograph which has a special boundary displacement type magnetic head.