Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-12-02
1994-07-19
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
H04N 5213
Patent
active
053314166
ABSTRACT:
Ghosts accompanying composite video signals are suppressed using separate filters for suppressing macroghosts and microghosts, the filtering parameters of these filters being adjustable responsive to digital programming signals generated by a computer. Computation includes data acquisition and channel characterization steps followed by a decision step for comparing the most recent set of channel characterization results with the next most recent set to determine whether stable ghosting conditions obtain. Data acquisition and channel characterization steps are repeated until stable ghosting conditions obtain, so the subsequent calculations with respect to the filter used for suppressing macroghosts are accurately performed. Where the filter suppressing macroghosts includes IIR and FIR sections for suppressing post-ghosts and preghosts, respectively, these calculations are carried out substantially on a separable basis, simplifying the calculations. Then, a step of calculating the filtering parameters for the FIR filter used for suppressing microghosts is followed by further data acquisition and channel characterization steps and a decision step comparing the most recent set of further channel characterization results with the next most recent set of further channel characterization results to determine similarity. If the sets of further channel characterization results are substantially the same, either method loops back to the further data acquisition step; if not, the adjustable filtering parameters for the filters are reset to initial values and the method restarts automatically.
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Patel Chandrakant B.
Yang Jim
Groody James J.
Lee Michael H.
Samsung Electronics Co,. Ltd.
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