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如果要从生物电放大器的输出信号中精确地把工频干扰减去就必须知道工频的精确频率。本文介绍了一个硬件系统,用于15导计算机化心电图机中同时记录ECG和共模工频信号。这个干扰参考信号和它的90°相位差(由软件得到)经线性组合后从导联中减去。通过减小工频干扰来改善12位A/D变换量的量化精度。在核对等电位区域(排除QRS波)用线性回归法来估计线性组合的系数。由于这种干扰参考信
If you want to accurately subtract the power frequency interference from the bioelectric amplifier output signal, you must know the exact frequency of the power frequency. This article describes a hardware system for simultaneous recording of ECG and common mode power frequency signals in a 15-lead computerized electrocardiograph. This interfering reference signal and its 90 ° phase difference (obtained by the software) are linearly combined and subtracted from the lead. Improve the quantization accuracy of 12-bit A / D conversion by reducing power frequency interference. The linear combination method is used to estimate the coefficients of the linear combination in the area of the isoelectric potential (excluding QRS waves). Due to this interference reference letter