Digital deghosting system
AssigneeRCA Corporation
InventorHenry G. Lewis, Jr.
Life of this patent
Estimating the term…
Abstract
A deghosting system incorporated in a digital television signal processing system includes a number of channels for producing digital samples of psuedo ghost signals for cancelling digital samples of respective ghost components of a contaminated video signal. Each channel includes a random access memory into which digital video samples are read and later read out of at a time corresponding to the delay between the respective ghost component and the main (desired) component of the ghost contaminated video signal. The resulting delayed digital samples are multiplied with an appropriate coefficient to generate the digital samples of the psuedo ghost signal.
Claims10
In a digital video processing system including analog-to-digital converter, means responsive to an analog video signal having a desired main component and undesired ghost components and a sampling signal for producing digital samples of said analog video signal, a deghosting apparatus, comprising:
- ghost identification means for identifying a predetermined number of said ghost components;
- ghost delay detection means for counting cycles of said sampling signal to generate counts representing the delay between said ghost components and said main component of said video signal;
- a plurality of channels each responsive to said digital samples for generating digital samples of a psuedo ghost component of a respective one of said ghost components;
- each of said channels including digital delay means coupled to said ghost delay detection means and said ghost identification means for delaying said digital samples of said video signal by incremental delays equal of the number of cycles of said sampling signal counted by said ghost delay detection means when the respective one of said ghosts is identified by said ghost identification means to produce delayed digital samples;
- and a digital multiplier for multiplying said delayed samples by a coefficient to generate said digital samples of said respective one psuedo ghost signals;
- and
- digital summing means for additively combining said digital samples of said video signal with said digital samples of said psuedo ghost signals to produce digital samples of a deghosted version of said video signal.
Dependencies are inferred from the claim text.