Video decoder basics

  1. AFE (analog Front End): pre-process and digitizes the analog signal.
  2. Automatic gain control (via a variable gain amplifier) on Luma or Chroma
    1. For luma, AGC may operate based on the depth of the horizontal sync pulse, or a fixed manual gain, etc.
    2. For chroma, AGC may operate based on the depth of the horiontal sync pulse on the luma channel, etc
  3. Color killer: usually there is a threshold, if the color carrier of the incoming video signal is less than the threshold,  the decoder switchs off the color processing.
  4. Clamping circuit: restore the proper DC level.
  5. Video characteristic adjustement
    1. Brightness
    2. Contrast
    3. Color saturation
    4. Hue
    5. Sharpness
    6. CTI (color transient improvement): to enhance the color bandwidth
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