H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/38 (2006.01) H04N 1/00 (2006.01)
Patent
CA 2405037
A filter-combiner (400) for combining television signals from adjacent channels is presented herein. The combiner has two inputs (404, 408) that respectively receive an NTSC combined visual and aural signal and a DTV signal wherein the NTSC signal and the DTV signal are in adjacent channels. The DTV signal is of greater frequency than the NTSC signal. A combined output signal (416) is provided at an output of the combiner. The combiner has sharp tuned filtering (100c, 100d) interposed between the inputs and the output and tuned to pass the DTV signal while reflecting the NTSC signal such that the passed DTV signal and the reflected NTSC signal combine as the combined output signal (416).
L'invention concerne un mélangeur-filtre destiné à mélanger des signaux de télévision provenant de canaux adjacents. Le mélangeur possède deux entrées qui reçoivent respectivement un signal visuel et sonore combiné NTSC et un signal DTV (TV numérique), le signal NTSC et le signal DTV étant dans des canaux adjacents. Le signal DTV est de fréquence plus élevée que le signal NTSC. A la sortie du mélangeur on obtient un signal de sortie mélangé. Le mélangeur comporte une filtration à syntonisation aiguë intercalée entre les entrées et la sortie et la syntonisation est réalisée de façon à passer le signal DTV tout en réfléchissant le signal NTSC de façon que le signal DTV passé et le signal NTSC réfléchi se mélangent sous forme de signal de sortie mélangé.
Harris Corporation
Oldham Edward H.
LandOfFree
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