Abstract:
This paper clarifies the influence of the voice
delay on human perception of group synchronization
error in remote learning by subjective assessment. In
our assessment, we produce the difference in output
timing of lecture video between a teacher terminal
and a student terminal. Each subject as a student
observes the output timing relation (i.e., group
synchronization) between the lecture video and
teacher’s voice, and then the subject answers
whether he/she perceives the group synchronization
error or not. We also examine the influence of
difference in voice contents on the error. Assessment
results demonstrate that the perception rate depends
on the group synchronization error plus the voice
delay, and all the subjects can hardly perceive group
synchronization errors (plus voice delays) less than
or equal to about 250 ms. We further illustrate that
the perception rate depends on the voice contents.
