【摘要】 用信号处理方法,对照分析磁波后心电图图形的变异与对应的频域参数。①心电信号功率谱有26～30个谱峰。自低频起,最初5个谱峰占功率谱总能量的50％,第1谱峰常占总能量约1/3;②P波主要与第3～6谱峰有关;③8Hz 以下频率影响 QRS形状,其上影响 R波幅度,15Hz以下影响Q波、S波构成;④T波主要与第1谱峰有关,3～13Hz 主要影响其幅度。更多还原

【Abstract】 As a time-domain-based description of cardioelectrical signals,ECG may also be represented with frequency domain through Fourier transformation. The frequency-domain-based analysis is more precise, especially possible for a definite introduction of phased messages. The ECG of I, V5 and aVR leads were recorded on a magnetic tape (FM) by passing signals respectively through HP, LP and BP filters with different cut-off frequencies and by means of diagraming of filtered signals, a comparative analysis could be carried out for time and frequency-domain parameters. Results showed that, (1) in the power spectrum of cardioelectrical signals, the first 5 spectrum peaks counted from LF side accounted for 50-60% 癴 the total power spectrum energy, and the first spectrum peak was the highest, its amplitude accounting for one third of total energy; (2) P-wave correlated mainly with spectrum peaks 1-13> (3) a frequency lower than g Hz had an influence upon the QRS shape and frequencies higher than 8 Hz had an influence on the amplitude of R-wave; (4) the T-wave structure correlated mainly with the spectrum peak 4, and frequencies of 3-13 Hz had an influence on the amplitude of T-wave.更多还原