Device and method for advanced Bayesian Kalman time estimation

摘要

A method and device are disclosed for calculating estimated time stamps ì_t in video distribution apparatus, MPEG-2 program encoders, multiplexers, splicers. True times Y_t of a data packet number t having the linear form:; $PTEXTHILITALICPDATY/PDAT/ITALIC/HILHILSBPDATt/PDAT/SB/HILHILITALICPDAT\=Y/PDAT/ITALIC/HILHILSBPDATt\−1/PDAT/SB/HILPDAT\+\&bgr;/PDATHILSBPDATt/PDAT/SB/HILPDAT,/PDAT/PTEXT$ ; $PTEXTPDAT\&bgr;/PDATHILSBPDATt/PDAT/SB/HILPDAT\=\&bgr;/PDATHILSBPDATt\−1/PDAT/SB/HILPDAT\+\&eegr;/PDATHILSBPDATt/PDAT/SB/HILPDAT,/PDAT/PTEXT$ ;with &eegr;_t being a small perturbation relative to the linear relation between time and packet number. The true times of data packet number t are observed as: o_t=Y_t+&egr;_t, where &egr;_t is an observational error. The estimated time stamps are produced according to: ì_t=ì_t−1+&bgr;_t and such that the value of &bgr;_t is made dependent on the exceeding by #o_t−ì_t−1−&bgr;_t−1 # of max[&egr;_t]. The results are accurate and smooth estimated time stamps.