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  • if color has high intensity means but has high frequency or high bandwidth? Commented Nov 29, 2021 at 10:31
  • @Stack The NTSC standard is quite old, and whenever it mentions bandwidth it literally refers to the width of the signal on the frequency domain (frequency axis). Refer to Fourier Transform to understand the theory on "frequency domain". Note that the signals Y, I, Q actually overlap significantly; they actually jam each other. Commented Nov 29, 2021 at 15:31
  • Some more materials: (1) the specification as it was written (PDF) Commented Nov 29, 2021 at 15:31
  • (2) A YouTube video that explains the NTSC signal (with a frequency plot for illustration) youtube.com/watch?v=3GJUM6pCpew&t=242s Commented Nov 29, 2021 at 15:35
  • Amplitude modulation. In other words, if the color is more vibrant, the signal amplitude is literally higher. Commented Nov 29, 2021 at 15:40