根据电视图像的相关特性，对PAL信号的三维谱结构及其特征进行了数学分析。
According to the correlation of TV image, the structure and characteristic of three dimensional spectrum in PAL TV signals is mathematically analyzed.
很奇怪，即使信号灯不闪烁，电视图像也一直时隐时现。
It was queer how the TV picture kept disappearing and reappearing even though the lights didn't flicker.
本课题正是利用现在比较流行的FPGA技术结合电视技术对数字化后的X射线透视图像的视频信号进行数字处理。
In this subject, the more popular FPGA technology combined with digital television technology is utilized for the processing of the video signal of the X-ray perspective image after digitalization.
并将生成信号经低通滤波器处理，从而最终得到了一个能够充分反映电视图像脉冲性、频率、幅度和带宽特点的较为逼真的信号波形。
After the signal is processed through a low-pass filter, a very realistic waveform is obtained which can show pulsed nature, frequency, amplitude and bandwidth of television picture signals.
并将生成信号经低通滤波器处理，从而最终得到了一个能够充分反映电视图像脉冲性、频率、幅度和带宽特点的较为逼真的信号波形。
After the signal is processed through a low-pass filter, a very realistic waveform is obtained which can show pulsed nature, frequency, amplitude and bandwidth of television picture signals.
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