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介绍一种由红外线传感器构成的数字式自行车速度表，分析了采用计数方式，直接由ＬＥＤ显示被测量的检测原理，提出了一种准同步启动窗口计数法。该方法与传统的窗口计数法比较，可减小一倍的时间检测误差。
A kind of digital bicycle speedometer composed of infrared sensors is introduced. The principle of counting which is directly measured by the LED display is analyzed. A quasi - synchronous window counting method is proposed. Compared with the traditional window counting method, this method can reduce the doubling time detection error.