在有线电视中实现程控有源滤波器设计

Realizing A Design of Programmed Control Have Filter in CATV

在有线电视中 ,为了充分利用设备和传输线 ,需要一种具有频率选择的网络—滤波器 ,将同一线路上不同的信号分开 ,在电视机中也需要不同的滤波器 (即选择有用信号 ,抑制无用信号 )。下面利用80 5 1单片机与 12位分辨率的DAC12 0 8数模转换芯片相结合的系统实现时间常数可程控有源滤波器设计 。

In the cable TV, for the sake of making use of equipments and deliver line, we need a network with frequency choosing-filter,which divide different signal of a circuit.and the TV machine inside also need the different filter(to choose useful signal and to check useless signal).this paperdescribes hardware construction and software design by realizing time constants controlled filter design according to the system of 8051 microprocessor and DAC 1208 combination.