Method and apparatus for assuring sufficient bandwidth of a...

H - Electricity – 04 – N

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H04N 7/58 (2006.01)

Patent

CA 2361047

Techniques for determining an output rate for a bit stream, the output rate being determined by applying information read from the bit stream to available bandwidths. The techniques are employed to construct a statistical multiplexer that multiplexes varying bit-rate bit streams onto a satellite up-link. Minimum and maximum output rates for each bit stream are determined such that neither a queue for the bit stream in the multiplexer nor the bit stream's decoder will underflow or overflow. The multiplexer looks at the fullness of the memory buffers and correlates the fullness with the likelihood of a condition in which output will exceed bandwidth. If there is not enough bandwidth to give every bit stream its minimum rate, glue frames may be inserted, or low priority channels dropped.

L'invention concerne des techniques qui permettent de déterminer le débit de sortie d'un train de bits en appliquant les informations lues dans ledit train aux largeurs de bande disponibles. On emploie ces techniques pour construire un multiplexeur statistique qui multiplexe les trains de bits à débit variable en une voie montante. Pour chaque train de bits, les débits de sortie minimum et maximum sont déterminés de façon que ni une file d'attente pour le train de bits dans le multiplexeur, ni le décodeur de train de bits ne subisse un soupassement ou un dépassement de capacité. Le multiplexeur contrôle l'état de remplissage des tampons mémoire et corrèle ledit état à la vraisemblance d'une condition dans laquelle la sortie risque d'excéder la largeur de bande. Si cette dernière n'est pas suffisante pour donner à chaque train de bits son débit minimum, des trames colle sont insérées ou des canaux basse priorité abandonnés.

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