摘要
设计了高端截止频率分别为１００Ｈｚ、３００Ｈｚ、１０００Ｈｚ的三通过放大器；用三通道接同一信号，保证了信号的同源性及同时性。研究表明放大器时间常数对心电信号波形有影响，如时间常数０．１秒时，出现Ｔ波双相最为明显。放大器带宽越宽心电信号高频成分越多，但功率很小。心电信号细节主要由采样频率决定，硬件带宽对之影响次之。
, An amplifier with three channels ,whose cut off frequencies at high frequency limit were 100Hz , 300Hz , 1000Hz ,respectively was designed. The characteristics of same source and same time of siginal was made by means of connecting same signal to three channels. The investigation demonstrated that time constant of an amplifier could affect the waveform tof ECS , for example , when the time constant was equal to 0. 1 second , biphase T wave appeared obviously. The wider the band of an amplifier was , the more the high frequency compositions of ECS were but the less the power was. The fine structures of ECS were determined mainly by sampling frequen- cy, the bandwidth of hardlware came secondly.
出处
《中国医学物理学杂志》
CSCD
1997年第2期117-118,共2页
Chinese Journal of Medical Physics
