Human Perception of Lip Synchronization in Mobile Environment

In literature, many studies about human perception of lip synchronization refer to experiences based on TV sets. In these cases, researchers give some hints on how easily humans percept lip synchronization problems. The in-sync region is typically known to be in the range -80ms to +80ms. Within this range most of the test candidates does not detect any lip synchronization skew. The out-of-synch region typically falls outside the range between -160ms and +160ms, where nearly everybody detects the lip synchronization error. Between those boundaries there is a transient area, where the detection of any lip synchronization problem depends on speaker size (head, shoulder or body view). These earlier assumptions based on TV environment do not hold for mobile environment, where the viewing characteristics and of the device itself are different. Therefore, further research is needed. The purpose of this paper is to find new results for human perception of lip synchronization in mobile environment. Results will show that new lip synchronization thresholds apply when using mobile phones and mobile media concepts.