Base band Signal Format

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Different formats posse the base band signal information in different ways. So you may ask what the information in base band signal is. The signal information and their tasks are as follows.
Chrominance information: The chrominance portion of the base band signal is the collection of the colour/ hue information. This portion of base band signal says what will be the ratio of red-green-blue colour at certain position of television screen.
Luminance information: The luminance portion of the base band signal commands the brightness information of certain position of television screen.
Audio: The audio portion of the base band signal is actually the audio information of corresponding video signal.
Sync pulse: This portion of the baseband signal posses various types of synchronizing pulses for different purpose. Such as for audio-video synchronization, synchronization for scanning sequence (for horizontal and vertical scanning in television receiver), frame/field synchronization etc.

Colour coding information: There are three colour coding technology in the world. They are NTSC (National Television System Committee), PAL(Phase Alternation Line) & SECAM (Sequential Colour with Memory).
Aspect ratio information: For a particular frame of the television picture aspect ratio is width divided by the height of that frame. This may be 4:3 or 16:9 depending on the technology.
Different formats (such as SD, HD, composite) actually posse the above information of base band signals in different ways. These ways provides some special features that ensure the quality of base band signal

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