心电信号及各组分的频率分布和有效带宽研究

Frequency Distribution and Effective Band Widths of Electrocardiac Signal and Its Components

本文用等长数据分析法对３４例１９－３０岁健康人的心电信号进行ＦＦＴ分析，以自身整个心动周期信号总功率的千分之一水平为标准（自适应的）确定了整个心动周期心电信号各频段功率（绝对和相对）的分布，报告了整个心动周期信号带宽为０－５８±１９Ｈｚ，Ｐ波带度为０－８±３Ｈｚ，ＱＲＳ波带宽为０－５５±１９Ｈｚ，Ｔ波带宽为０－１１±２Ｈｚ．研究表明心电信号的能量主要集中在低频段，随着频率增高相应的能量逐渐降低．心电信号存在高频成分，甚至是５００Ｈｚ以上的成分．

The Electrocardiac Signals (ECS) of 34 healthy subjects aged 19-30 were examined and analysedby means of the FFT method with same length of data segment. Using one thousandth of total power of entire cycle signal as reference (adaptive ), we got the power distribution (absolute and relative) in various bands of entirecycle ECS. The band widths of entire cycle signal. P-. oRS-- and T- waves were computed, which were 0~ sg Il gHz, 0-- 58 t 19Hi. 0~ 8 1 3Hi, 0~ 55 f 19Hi and 0 ~ 11 1 ZHz, respectively. The investigation demonstratedthat most of the power of ECS was distributed in the low frequency band. and the corresponding power decreasedgradually when the frequency increased. There were high frequency comPOnents even higher than 500Hi in ECS.