Vsb hdtv transmission system with reduced ntsc co-channel...

H - Electricity – 04 – N

Patent

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H04N 7/50 (2006.01) H04B 1/68 (2006.01) H04B 15/00 (2006.01) H04N 5/21 (2006.01) H04N 5/455 (2006.01) H04N 7/015 (2006.01) H04N 7/08 (2006.01) H04N 11/24 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2095435

A television signal transmission signal comprises a suppressed carrier, VSB signal having respective Nyquist slopes at the lower and upper edges of a 6MHz television channel, the center frequency of the Nyquist slope at the lower edge of the channel being substantially coincident with the frequency of the suppressed carrier, and the pilot signal in quadrature relation with the suppressed carrier. The suppressed carrier is modulated by an N-level digitally encoded signal having a sample rate fs substantially equal to three times the NTSC color subcarrier frequency, with the frequency of the color subcarrier being less than the co channel NTSC picture carrier by an amount equal to about fs/12. The received signal is demodulated by a synchronous detector in response to the received pilot signal and interfering NTSC beat components are attenuated by a linear filter having notches at fs/12, 5fs/12 and fs/2. The output of the filter comprises an M-level signal, where M = greater than N, which is converted to a N-level output signal representing the televised image.

Signal de transmission de signaux de télévision comprenant une porteuse supprimée, un signal BLR ayant des pentes de Nyquist respectives sur les bords inférieur et supérieur d'un canal de télévision de 6MHz, la fréquence centrale de la pente de Nyquist sur le bord inférieur du canal coïncidant pratiquement avec la fréquencede la porteuse supprimée, et un signal pilote en relation de quadrature avec la porteuse supprimée. La porteuse supprimée est modulée par un signal codé numériquement de niveau N ayant un rythme d'échantillonnage fs pratiquement égal à trois fois la fréquence de la sous-porteuse couleur NTSC, la fréquence de la sous-porteuse couleur étant inférieure d'une valeur égale à environ fs/12 à la porteuse d'image NTSC dans un même canal. Le signal reçu est démodulé par un détecteur synchrone en réponse au signal pilote reçu et les éléments de battement NTSC parasites sont atténués par un filtre linéaire produisant des flancs raides à fs/12, 5fs/12 et fs/2. La sortie du filtre comprend un signal de niveau M, M étant supérieur à N, qui est converti en un signal de sortie de niveau N représentant l'image télévisée.

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