用广播电台报时信号自动校准电子钟

AUTOMATIC CALIBRATION FOR ELECTRONIC CLOCK WITH THE BROADCASTING TIME SIGNAL

用音频锁相环NE567组成单音频识别电路 ,通过软件消除干扰 ,从广播电台的播音信息中提取出报时信号 ,作为单片微处理器的中断源 。

A single audio discriminator circuit is made up with a NE567 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.