NOVEL APPROACH FOR AUDIO VIDEO SYNCHRONIZATION IN DIGITAL SET-TOP BOX

摘要

This paper presents certain enhancements for AV Syncrn(Audio Video synchronization) in digital STB (Set-ToprnBox). Audio Video synchronization has always provedrndifficult to implement in STB. The main reason of AVrnSync problem is difference in processing path of audiornand video. Simultaneous synchronization of audio withrnHD (High Definition) and SD (Standard Definition)rnoutput impose very tight constraints. Various models forrnCorrect AV Sync implementation has been suggested byrnresearchers in the similar field. However, none of themrnaddresses the AV Sync problem of dual video (HD & SDrnsimultaneously) with audio. STB has not been consideredrnas possible application for their implementation so suchrnmodels are not suitable for Real Time set top boxrnapplication. This paper has done detailed analysis ofrnvarious STB applications scenarios and their tightrnconstraints. The current AV Sync implementations ofrnSTB have been analyzed and certain enhancements inrncurrent software implementations have been proposed. Inrnthis paper we have also proposed few novelrnsynchronization models that offer better synchronizationrnaccuracy. These models have been implemented in Realrntime application in set top box. Testing of proposedrnimplementation in the RTOS environment meets STB AVrnsync constraints.