程控滤波器的程序，包括由CH451程序用来驱动LED显示和按键，HC4051的程控程序，以及单片机中断等相关程序，通过按键来使HC4051开关发生改变，从而由其控制的频率值发生变化，通过LED可以显示，即可达到程控的作用，是在Keil C51中运行的-Filter program procedures, including procedures used by the CH451 display and keypad LED drivers, HC4051 the program procedures, as well as related procedures such as single-chip interrupted by HC4051 switch button to make changes in order to control the frequency of its change in value through the LED display can be programmed to achieve the role of