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数字电视工作原理:数字电视机主要是把电视台发送出来信号经天线接收后,经由调谐器将中心频率约在200MHz～800MHz之间的高频(RF)信号降低为中心频率为36MHz左右的中频(IF)信号,然后经由表面声波滤波器(Surface Acous-tic Wave Filter)过滤掉不需要的信号,随后再经由解调器(Demodulator)将模拟信号转换为数字信号,并进一步降为中心频率为10MHz的基频(Baseband)信号,这时才是100%的数字信号,之后MPEG解码器处理这些数字信号转换为模拟信号,这时的模拟信号还是隔行扫描信号,再经过后段图像处理器插补算法形成逐行扫描信号。
Digital TV works: digital TV is sent to the TV station through the antenna signal received by the tuner center frequency of about 200MHz ~ 800MHz between the high-frequency (RF) signal is reduced to a center frequency of about 36MHz IF IF signal, and then filtered through the surface acoustic wave filter (Surface Acous-tic Wave Filter) unwanted signals, and then through the demodulator (Demodulator) the analog signal is converted to digital signals, and further down to the center frequency of 10MHz Of the Baseband signal, then it is 100% digital signal, after which the MPEG decoder to convert these digital signals into analog signals, then the analog signal is interlaced signal, and then after the image processor interpolation The algorithm forms a progressive scan signal.