Their exact frequencies were chosen such that ( for NTSC ), they are midway between two harmonics of the frame repetition rate, thus ensuring that the majority of the power of the luminance signal does not overlap with the power of the chrominance signal.
22.
There are three components in the composite waveforms for the NTSC, PAL and SECAM broadcast television systems a wideband luminance signal ( Y ) and two narrow band colour-difference signals, containing ( R Y ) and ( B Y ).
23.
When the color components are kept as separate signals, the video is called component analog video ( CAV ), which requires three separate signals : the luminance signal ( Y ) and the color difference signals ( R-Y and B-Y ).
24.
(The luminance signal used in this process was assumed to originate from a combination of signals from the red, green and blue images in a three tube camera, where Y is given by ( here ignoring issues with gamma correction, for simplicity ):
25.
When used with PAL, the colour subcarrier is 4.43361875 MHz and the sidebands of the PAL signal have to be truncated on the high-frequency side at + 570 kHz ( matching the rolloff of the luminance signal at + 5.0 MHz ).
26.
When testing with PAL, the colour subcarrier was 2.66034375 MHz and the sidebands of the PAL signal had to be truncated on the high-frequency side at + 330 kHz ( matching the rolloff of the luminance signal at + 3.0 MHz ).
27.
When used with PAL, the colour subcarrier is 4.43361875 MHz and the sidebands of the PAL signal have to be truncated on the high-frequency side at + 1.066 MHz ( matching the rolloff of the luminance signal at + 5.5 MHz ).
28.
The precise frequency was chosen so that horizontal line-rate modulation components of the chrominance signal would fall exactly in between the horizontal line-rate modulation components of the luminance signal, thereby enabling the chrominance signal to be filtered out of the luminance signal with minor degradation of the luminance signal.
29.
The precise frequency was chosen so that horizontal line-rate modulation components of the chrominance signal would fall exactly in between the horizontal line-rate modulation components of the luminance signal, thereby enabling the chrominance signal to be filtered out of the luminance signal with minor degradation of the luminance signal.
30.
The precise frequency was chosen so that horizontal line-rate modulation components of the chrominance signal would fall exactly in between the horizontal line-rate modulation components of the luminance signal, thereby enabling the chrominance signal to be filtered out of the luminance signal with minor degradation of the luminance signal.
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