实时时钟自动校准在出租车计价器上的应用

AUTOMATIC CALIBRATION FOR TAXI DIGITAL ODOMETER WITH THE BROADCASTING TIME SIGNAL

为了避免出租车计价器进行人工校时,在出租车计价器中引用了实时时钟自动校准技术。通过采用音频锁相环LM567组成的单音频识别电路,从广播电台的一系列音频信号中提取报时信号,并将其转换为脉冲信号,再经软件进一步消除干扰信号,从而实现对出租车计价器的实时时钟进行自动校准。

A single audio discriminator circuit is made up of a LM567 phase locking ring. The interference is cleared up by software and the time signal is picked up from the broadcasting information as the interrupt source of the singlechipmicrocomputer to calibrate electronic clocks of taxi digital odometer.