目的：探讨无创性经食管信号叠加直接记录窦房结电位（SNP）的技术。
Objective To explore a noninvasive transesophageal signal averaging technique for direct recording of sinus node potential (SNP).
方法：该电路利用二极管的结电压随温度变化的特性实现呼吸信号的检测。
Methods the respiratory signal is detected by the characteristics of diode junction voltage with temperature changes.
系统选用PN结温度传感器，可同时测取16个温度信号，经数据处理后可实时显示、打印或控制。
PN junction temperature sensor is used. 16 temperature signs are acquired at the same time. Proceeded data can be indicated, printed or controlled.
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