一、前言在医学和生理学检查中,经常需要又快又准确地测量心率。过去二十年中,已设计和制造出各种类型的心率计,它们用模拟的或数字的形式给出心脏周期频率的直接读数。这些心率计量程为每分钟40～200次心跳到每分钟30～900次心跳.误差在1%到5％的范围。大多数仪表,包括使用数字技术测量周期的一些仪表,具有模拟仪表显 First, the preface In medical and physiological examination, often need to quickly and accurately measure heart rate. Over the past two decades, various types of heart rate meters have been designed and manufactured that give direct readings of heart cycle frequency in either analog or digital form. These heart rate meters range from 40 to 200 beats per minute to 30 to 900 beats per minute with errors in the range of 1% to 5%. Most meters, including some that measure using digital techniques, have analog meters