related to color television

what is chroma signal....what is polarization...?
how the chroma signal(chroma section) differentiate the color, black & white TV...?

Hi;
Chroma is the color component of the video. The other component is Y (luminance) which only contains the back and white information. Color TVs have color decoders to process the color information. It is phase coded in CVBS video.
Please explain some more about what you want to ask/mean.

Chrominance - Wikipedia, the free encyclopedia

Polarisation is used in TV transmission. In the UK main TV transmitters are always horizontally polarised. a Re broadcast site always uses vertical polarisation. The reason for this is that a RBR TX may be on the same frequency as a main transmitter, but the change of polarisation means that the receiver gets 10dB less interferrence from one when viewing the other, so that the frequencies may be re-used more often or the RBR TX can be closer to a main transmitter.
Frank