一、问题的引出无线电遥测是测量人体心电信号的一个重要手段,心电信号的磁带记录是心电遥测的一个重要组成部分。为实现超低频的心电信号的高质量遥测和磁录,人们已经研究了多种多样的信号调制方式。目前,国内外又 First, the problem leads to Radio telemetry is an important measure of the human body ECG signals, tape ECG signal recording is an important part of telemetry. In order to achieve high-quality telemetry and magnetic recording of ultra-low frequency ECG signals, a variety of signal modulation methods have been studied. At present, both at home and abroad