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2010-11-24T18:38:57Z
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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0013596-A1-19800723
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EP-0013596-A1-19800723
In a dual-standard PAL/SECAM color TV reciever, an identification system (15) provides a mode-switching output, permitting automatic switching (17) of the receiver between a PAL-reception mode of operation and a SECAM-reception operating mode, in dependence upon the PAL or SECAM nature of the transmission received. In the SECAM-reception mode, a PAL decoder (19) receives the chrominance component output of a SECAM-PAL transcoder (13); in the PAL-reception mode, the PAL decoder receives (via 21) chrominance signals which bypass the transcoder (13). To equalise the signal delays in the chrominance and luminance signal channels of the receiver in the two operating modes, the luminance channels includes a switchable luminance signal delay line (33) in cascade with a chrominance component trap circuit (60, 80). The switchable delay line (33) is controlled by the mode-switching output of the identification system (15) such that delay line (33) is interposed in luminance signal path only during SECAM-reception mode operation. The delay magnitude provided by delay line substantially matches difference in delays suffered by chrominance information during operation in the respective modes. The trap circuit, (60, 80) providing luminance delay substantially compensating the delay suffered by chrominance information during operation in PAL-reception mode, includes resonant circuits (60, 80) tuned respectively to the two SECAM subcarrier resting frequencies.
In a dual-standard PAL/SECAM color TV reciever, an identification system (15) provides a mode-switching output, permitting automatic switching (17) of the receiver between a PAL-reception mode of operation and a SECAM-reception operating mode, in dependence upon the PAL or SECAM nature of the transmission received. In the SECAM-reception mode, a PAL decoder (19) receives the chrominance component output of a SECAM-PAL transcoder (13); in the PAL-reception mode, the PAL decoder receives (via 21) chrominance signals which bypass the transcoder (13). To equalise the signal delays in the chrominance and luminance signal channels of the receiver in the two operating modes, the luminance channels includes a switchable luminance signal delay line (33) in cascade with a chrominance component trap circuit (60, 80). The switchable delay line (33) is controlled by the mode-switching output of the identification system (15) such that delay line (33) is interposed in luminance signal path only during SECAM-reception mode operation. The delay magnitude provided by delay line substantially matches difference in delays suffered by chrominance information during operation in the respective modes. The trap circuit, (60, 80) providing luminance delay substantially compensating the delay suffered by chrominance information during operation in PAL-reception mode, includes resonant circuits (60, 80) tuned respectively to the two SECAM subcarrier resting frequencies.
en
European Patent Office
EP0013596
EP 0013596
H04N 09/32
H04N 09/535
Luminance delay control apparatus in PAL/SECAM television receiver
Luminance delay control apparatus in PAL/SECAM television receiver - European Patent Office - EP 0013596 A1
Luminance delay control apparatus in PAL/SECAM television receiver - European Patent Office - EP 0013596 A1
Adobe PDF Library 8.0
"EP0013596"; "EP 0013596"; "H04N 09/32"; "H04N 09/535"; "Luminance delay control apparatus in PAL/SECAM television receiver"
1.4
1
B
17
EP
0013596
A1
1980-07-23
80300020
1980-01-03
GB
7900801
1979-01-09
H04N 09/32
H04N 09/535
RCA CORPORATION
Hinn, Werner
DELETED Smith, Thomas Ian Macdonald (GB)R. 102(1)20.01.1992 et al
Luminance delay control apparatus in PAL/SECAM television receiver
Vorrichtung zur Verzögerungsregelung des Leuchtdichtesignals in einem PAL/SECAM-Fernsehempfänger
Luminance delay control apparatus in PAL/SECAM television receiver
Dispositif de commande de retard du signal de luminance dans un récepteur de télévision PAL/SECAM
In a dual-standard PAL/SECAM color TV reciever, an identification system (15) provides a mode-switching output, permitting automatic switching (17) of the receiver between a PAL-reception mode of operation and a SECAM-reception operating mode, in dependence upon the PAL or SECAM nature of the transmission received. In the SECAM-reception mode, a PAL decoder (19) receives the chrominance component output of a SECAM-PAL transcoder (13); in the PAL-reception mode, the PAL decoder receives (via 21) chrominance signals which bypass the transcoder (13). To equalise the signal delays in the chrominance and luminance signal channels of the receiver in the two operating modes, the luminance channels includes a switchable luminance signal delay line (33) in cascade with a chrominance component trap circuit (60, 80). The switchable delay line (33) is controlled by the mode-switching output of the identification system (15) such that delay line (33) is interposed in luminance signal path only during SECAM-reception mode operation. The delay magnitude provided by delay line substantially matches difference in delays suffered by chrominance information during operation in the respective modes. The trap circuit, (60, 80) providing luminance delay substantially compensating the delay suffered by chrominance information during operation in PAL-reception mode, includes resonant circuits (60, 80) tuned respectively to the two SECAM subcarrier resting frequencies.
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