Importance

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Abstract

A method for reducing noise and interference artifacts in a television system including a transmissiion end for transmitting a quadrature modulated color subcarrier television signal through a degrading medium and for display at a reception end, the method includes the transmission steps of: dividing the television signal into two paths, a main path and a preemphasis path, developing a main path television signal component in the main path, deriving a preemphasis component from the television signal in the preemphasis path in accordance with at least one predetermined preemphasis criterion, multiplexing the preemphasis component from the preemphasis 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 preemphasis 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 preemphasis component, combining the received main path television signal component and the received preemphasis component into a single television reception signal, deemphasizing the single television reception signal in accordance with an inverse of said predetermined preemphasis criterion, and putting out said deemphasized 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 preemphasis component.

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First Claim