可程控开关电容滤波器设计的三部分代码。用到的芯片有AT89C2051、MAX261等。-programmable switched-capacitor filter design of the three-part code. The chip is used AT89C2051, MAX261, and so on.

其片内设有时钟振荡器、128K字节EZPROM(电可编程可擦除只读存贮器)、低噪前置放大器、自动增益控制电路、反混叠滤波器、平滑滤波器、模拟转发器、差动功率放大器等高品质语音录放系统所需的全部基本功能电路。-There are chip clock oscillator, 128K bytes EZPROM (electrical erasable programmable read-only memory), low-noise pre-amplifier, AGC circuit, anti