以FPGA为开发平台的交通信号系统，带有倒计时和蜂鸣器功能。
To FPGA development platform for the traffic signal system, with a countdown and the buzzer function.
比较功能，上下限偏差值自由设定，红绿指示灯及蜂鸣器自动声光报警设置；
Compare function, free to set upper and lower deviation, red and green indicator light and buzzer sound and light alarm settings automatically;
若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。
If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.
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