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Bowman, Howard; Faconti, Giorgio; Katoen, J-P.; Latella, D.; Massink, M. (1998)
Publisher: CWI
Languages: English
Types: Unknown
Subjects: QA76
We present the formal specification and verification of a lip synchronisation algorithm using the real-time model checker UPPAAL. A number of specifications of this algorithm can be found in the literature, but this is the first automatic verification. We take a published specification of the algorithm, code it up in the UPPAAL timed automata notation and then verify whether the algorithm satisfies the key properties of jitter and skew. The verification reveals some flaws in the algorithm. In particular, it shows that for certain sound and video streams the algorithm can timelock before reaching a prescribed error state.
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