Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Reexamination Certificate
2006-01-17
2006-01-17
Yenke, Brian P. (Department: 2614)
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
C348S612000, C348S618000, C348S619000, C348S624000, C348S627000, C382S266000, C382S273000
Reexamination Certificate
active
06987542
ABSTRACT:
The invention relates to a method and apparatus for detecting asymmetry in transient signals and to a method and apparatus for correcting such asymmetry. In the apparatus for detecting asymmetry there is provided a pre-shoot filter (1) for receiving an input signal Yin and asymmetrically filtering it utilizing a first set of filter coefficients to provide a first output in which substantially only pre-shoots of input transient signals are present, an after-shoot filter (2) for receiving the input signal and symmetrically filtering it utilizing a second set of filter coefficients to provide a second output in which substantially only after-shoots of input transient signals are present, and summing and comparison means (3to11) for summing the first outputs over a predetermined time interval, summing the second outputs over the predetermined time interval, and comparing first and second summed outputs to give an output signal indicating whether pre-shoots or after-shoots predominate over the predetermined time interval.
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Goodman Edward W.
Koninklijke Philips Electronics , N.V.
Yenke Brian P.
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