Composite signals are essential for displaying brilliant images or pictures on your TV screen. They most commonly used video signals which offer lower quality. It also has another name as “the lowest denominator of video connectivityâ€. As it has limited band width, there are chances for overlapping of brightness, contrast and colour. This problem of overlapping creates another problem of inability to differentiate the identity between brightness information and chrominance information.
Later this confusion leads to fuzziness and artifacts on the screen of your LCD TV. An element called “comb filter†has been designed and implemented to remove those fuzziness arising out of composite signals. These filters use different filtering methods to clean this fuzziness. These filters can be availed in two distinct forms namely feed forward and feedback.It has classified on the basis of direction of signals.
- Feed Forward – It is a unique system, mainly used for showing the feed forward behaviour responds. It can be measured in a pre-defined way with the support of feedback system. It is possible to implement this comb filters in 2 ways namely discrete time or continuous time.
- Feedback – It is a kind of video signal which is always looped back within a system for controlling. This type of loop has been called as feedback loop. This control system has come with input as well as output. If the output of the system is feed back into controlling system of its output, that status is said to be as feedback.
Thus the comb filter element has been embedded within LCD televisions to serve a vital process of removing the fuzziness on the TV screen. So when you plan to purchase a new television make sure that the television is supported by the comb filter feature to get clear and bright images.
