Process and apparatus for converting an mpeg-2 bitstream...

H - Electricity – 04 – N

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Details

H04N 7/01 (2006.01) H04N 5/46 (2006.01) H04N 7/26 (2006.01) H04N 11/20 (2006.01) H04N 7/24 (2006.01) H04N 7/52 (2006.01) H04N 7/62 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2313525

A process and apparatus for converting an MPEG-2 bistream into an SMPTE-259 compatible bitstream are characterized by a frame rate converter which is selectively ambled to drop every 1001st frame of the incoming MPEG-2 bitstream depending on the input bitstream frame rate. If the input bitstream frame rate is other than 29.97 or 59.94 Hz, a frame dropper is enabled to discard every 1001st frame. The present converter can convert many different types of input bitstreams, such as all I types, IPIP types, or complex GOP types containing I, P, and B frames. The enabled frame dropper will drop either the I or P frame if it occurs as the 1001st frame, but if the 1001st frame is of the B frame type, the pixel information of the B frame is dropped. This produces a minimum in loss of information during the conversion. The format converter allows existing SMPTE-259 routing equipment to route and utilize MPEG-2 bitstreams, such as HDTV applications.

L'invention concerne un procédé et un appareil de conversion d'un train de bits MPEG-2 en un train de bits compatible avec SMPTE-259, l'invention se caractérisant par l'utilisation d'un convertisseur de fréquence de trame qui peut sélectivement éliminer chaque 1001ème trame du train de bits entrant, en fonction de la fréquence de trame du train de bits d'entrée. Si la fréquence de trame du train de bits d'entrée n'est ni de 29,97 ni de 59,94 Hz, un dispositif d'élimination de trame peut supprimer chaque 1001ème trame. Le convertisseur selon la présente invention peut convertir plusieurs types différents de trains de bits d'entrée, tels que tous les trains de bits à format de type I, de type IPIP, ou de type GOP complexe contenant des trames I, P, et B. Le dispositif d'élimination de trame peut éliminer la trame I ou la trame P s'il intervient à la 1001ème trame, mais si la 1001ème trame est une trame du type B, les données de pixel de la trame B sont éliminées, ce qui entraîne une perte minimale pendant la conversion. Grâce au convertisseur de format, le matériel d'acheminement existant de SMPTE-259 peut acheminer et utiliser des trains de bits MPEG-2, tels que des applications de TVHD.

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