| 摘要 |
<p>A method is disclosed for reducing noise and interference artifacts in a television system including a transmission end for transmitting a quadrature modulated colour sub-carrier television signal through a degrading medium and for display at a reception end, the method comprising the transmission steps of: dividing the television signal into two paths, a main path and a pre-emphasis path, developing a main path television signal component in the main path, deriving a pre-emphasis component from the television signal in the pre-emphasis path in accordance with at least one predetermined pre-emphasis criterion, multiplexing the pre-emphasis component from the pre-emphasis path into a single spectrum including the main path television signal component, the single spectrum having a bandwidth substantially no greater than that required by the main path television signal without substantial intermixture of the pre-emphasis component and the main path television signal, and passing the single spectrum through the degrading medium; and comprising the reception steps of separating the single spectrum into a received main path television signal component and a received pre-emphasis component, combining the received main path television signal component and the received pre-emphasis component into a single television reception signal, de-emphasizing the single television reception signal in accordance with an inverse of said predetermined pre-emphasis criterion, and putting out said de-emphasized single television reception signal for display. In its preferred embodiment, the method remains downwardly compatible with existing television reception display devices while improving picture quality on displays equipped to process the hidden pre-emphasis component.</p> |
