公开(公告)号：EP0466064A1

公开(公告)日：1992-01-15

申请号：EP91111285.2

申请日：1991-07-06

Applicant: BIOMAGNETIC TECHNOLOGIES, INC.

Inventor： Crum, Duane B.

IPC: A61B5/04

CPC classification number: A61B5/04009 ,  Y10S128/901

Abstract: A biomagnetometer measures the magnetic field produced by the brain as a result of a visual stimulus delivered by a display device such as a cathode ray tube (CRT). The output signal of the biomagnetometer is filtered to remove noise introduced by the operation of the display device itself, such as the repetitive scan signal of the CRT, and the CRT monitor is otherwise operated from DC power to minimize periodic variations that can interfere with the detection of brain signals. The filtering is preferably accomplished using a comb-notch filter. Cancellation coils and shielding are also preferably used to remove a portion of the noise introduced by the display device.

Abstract translation: 生物电子计测量由诸如阴极射线管（CRT）的显示装置传递的视觉刺激的结果，由脑产生的磁场。 对生物仪表的输出信号进行滤波以去除由显示装置自身的操作引入的噪声，例如CRT的重复扫描信号，并且CRT监视器以其它方式从DC电力进行操作，以使可能干扰 检测脑信号。 滤波优选使用梳状陷波滤波器来实现。 取消线圈和屏蔽也优选地用于去除由显示装置引入的噪声的一部分。