Comb filter
AssigneeKoninklijke Philips Electronics N.V.
InventorMichael Nieuwenhuizen
Life of this patent
Estimating the term…
Abstract
In a method of compensating errors in comb filters in a line-locked sample domain, an input video signal (CVBS) is delayed (LD1, LD2) by first and second integral numbers of lines to obtain first and second delayed signals, a phase difference is measured (PM) between at least two of the input video signal (CVBS) and the first and second delayed signals, and a phase of the input video signal (CVBS) and a phase of the second delayed signal are corrected (PC1, PC2) with respect to the first delayed signal in dependence on the phase difference.
Claims5
A method of compensating errors in comb filters in a line-locked sample domain, the method comprising:
- delaying (LD1, LD2) an input video signal (CVBS) by first and second integral numbers of lines to obtain first and second delayed signals;
- measuring (PM) a phase difference between at least two of said input video signal (CVBS) and said first and second delayed signals;
- and
- correcting (PC1, PC2) a phase of said input video signal (CVBS) and a phase of said second delayed signal with respect to said first delayed signal in dependence on said phase difference.
A comb filter in a line-locked sample domain, the comb filter comprising:
- means for delaying (LD1, LD2) an input video signal (CVBS) by first and second integral numbers of lines to obtain first and second delayed signals;
- means for measuring (PM) a phase difference between at least two of said input video signal (CVBS) and said first and second delayed signals;
- and
- means for correcting (PC1, PC2) a phase of said input video signal (CVBS) and a phase of said second delayed signal with respect to said first delayed signal in dependence on said phase difference.
Dependencies are inferred from the claim text.