Error Control Codes For Advanced Television Signals Based Upon Preliminary And Post Filtering

Several aspects of the design of filters for burst error control for television signals in new or existing, analog or digital formats wili be described. The error control capability is provided by prefiltering, so no redundant information need be transmitted. Prefilters which minimize distortion of the image and optimize effectiveness in estimating errors will be discussed. Postfilters which can compensate for the prefiltering, further minimizing the small distortion are discussed. These error control methods can implement very efficient real-number outer codes that provide burst or impulse noise protection for signals in digital format that may employ standard finite-field inner codes, data compression algorithms, and other digital or analog processing. This inner processing can exacerbate impulse noise or cause substantial burst errors, which should be removed by outer codes, such as the described ones, in order to achieve the desired subjective improvement of advanced television.