H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/21 (2006.01) H04N 7/015 (2006.01) H04N 11/24 (2006.01) H04N 5/44 (2006.01)
Patent
CA 2221317
A receiver receives an ATV (e.g. HDTV) signal in an area that is subject to NTSC co-channel and other interferences. The received signal is precoded at the transmitter for enabling reduction of NTSC co-channel interference in the received signal. The received signal includes field sync signals that are successively field combed to produce a subtraction signal. The subtraction signal is comb filtered to reduce NTSC co-channel interference and applied to a comparator (36) along with the unfiltered subtraction signal. The comparator determines whether the level of NTSC co-channel interference is sufficiently great to subject the received ATV signal to comb filtering for reducing the NTSC co-channel interference.
Un récepteur reçoit un signal ATV (par exemple, HDTV) dans une zone soumise à un brouillage dans la même voie NTSC et à d'autres interférences. Le signal reçu est codé préalablement au niveau de l'émetteur afin de pouvoir limiter le brouillage dans la même voie NTSC dans le signal reçu. Le signal reçu comprend des signaux de synchronisation de trame soumis successivement à un filtre à peigne, de manière à produire un signal de soustraction. Ce signal de soustraction est soumis à un filtre à peigne afin de limiter le brouillage dans la même voie NTSC et appliqué à un comparateur (36) avec le signal de soustraction non filtré. Le comparateur détermine si le niveau de brouillage dans la même voie NTSC est suffisamment important pour soumettre le signal ATV reçu à un filtre à peigne, afin de limiter ledit brouillage.
Nielsen Larry E.
Sgrignoli Gary J.
Marks & Clerk
Zenith Electronics Corporation
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