Multimode interpolation filter as for a tv receiver

H - Electricity – 04 – N

Patent

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Details

H04N 11/20 (2006.01) H04N 5/44 (2006.01) H04N 7/01 (2006.01) H04N 9/64 (2006.01) H04N 11/02 (2006.01)

Patent

CA 2179882

A multimode scan converter includes a delay element (33) for delaying one horizontal line of video signal and selectively redisplaying that line. A multiplexer (30) is arranged to selectively provide either luminance signal or chrominance signal to the delay element. Output signal from the delay element and output signal from the multiplexer are coupled to a proportioning circuit (34) which sums the two signals in complementary proportions (e.g. K and 1-K). A second multiplexer (35), which provides up-converted output luminance signal, is arranged to selectively pass the luminance signal or signal from the proportioning circuit. A third multiplexer (36), which provides up-converted output chrominance signal, is arranged to selectively pass the chrominance signal or signal from the proportioning circuit.

Un convertisseur de balayage multimode comprend un élément de retard (33) permettant de retarder une ligne horizontale d'un signal vidéo et de réafficher sélectivement cette ligne. Un multiplexeur (30) est agencé afin de fournir sélectivement soit un signal de luminance soit un signal de chrominance à l'élément retard. Un signal de sortie provenant de l'élément retard et un signal de sortie provenant du multiplexeur sont couplés sur un circuit proportionnel (34) qui additionne les deux signaux dans des proportions complémentaires (par exemple K et 1-K). Un second multiplexeur (35), qui produit un signal de luminance de sortie converti progressivement, est agencé pour passer sélectivement le signal de luminance ou le signal provenant du circuit proportionnel. Un troisème multiplexeur (36), qui fournit un signal de chrominance de sortie converti progressivement, est agencé pour faire passer sélectivement le signal de chrominance ou le signal provenant du circuit proportionnel.

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