论文部分内容阅读
所谓梳状滤波器是因为传输特性具有梳齿状。是根据在视频信号中亮度信号和色度信号频谱交织原理及梳状滤状器具有梳齿状幅频特性,以频谱分离方式将亮度信号和色度信号分离。它比传统的频率分离方式具有更好的分离特性,是消除亮色串扰,提高图像质量的重要手段。图1是PAL锚梳状滤波器的原理方框图,它是由一个能延迟2行的延迟器件,加法器,减法器等电路组成。由亮度信号和色度信号组成复合全电视信号,分别送到加法器和减法器的一个输入端(称为直通信号);经2H延迟的视频信号分别送到加法器和减法器的另一个输入端(称为延迟信号)。在加法器中,
The so-called comb filter because of the transmission characteristics with comb-like. Is based on the video signal in the luminance signal and chrominance signal spectrum interleaving principle and comb filter with comb-tooth amplitude-frequency characteristics, the spectral separation of the luminance signal and chrominance signal separation. It has better separation characteristics than the traditional frequency separation method, which is an important means to eliminate the bright color crosstalk and improve the image quality. Figure 1 is a block diagram of the principle of a PAL anchor comb filter, which consists of a delay device, adder, subtractor and other circuits that delay 2 lines. The composite video signal consists of a luminance signal and a chrominance signal, and is sent to one input end of the adder and subtractor (called a pass signal). The video signal delayed by 2H is sent to the other input of the adder and subtractor, respectively Side (called a delayed signal). In the adder,