Table 5.

Questions related to Media Quality IFs. Media quality refers to the quality of the sound (audio) and the image (video) in terms of perceivable impairments (e.g., perceptible audio delay, image blurriness). Please evaluate how important you consider the following factors of audiovisual calls

Rating scale	5	4	3	2	1
How important do you consider the following factor for overall audiovisual call quality?a
Speech intelligibility	○	○	○	○	○
Voice naturalness	○	○	○	○	○
Uninterrupted interaction during communication	○	○	○	○	○
Audio-video synchronization	○	○	○	○	○
Image sharpness	○	○	○	○	○
Smooth movement in the video	○	○	○	○	○
Color accuracy (colors do not differ	○	○	○	○	○
significantly from real colors)
To what extent do you consider the following factor to impact overall audiovisual call quality?b
Perceptible audio delay	○	○	○	○	○
Perceptible video delay	○	○	○	○	○
Short and occasional video freezes	○	○	○	○	○
(lasting a few seconds)
Longer video freezes (i.e., longer than 15 seconds)	○	○	○	○	○
impact overall audiovisual call quality, if the audio
quality remains good for the duration of the call
Image blurriness	○	○	○	○	○

^a 5 - “Very Important”, 4 - “Important”, 3 - “Moderately Important”, 2 - “Slightly Important”, 1 - “Not Important”

^b 5 - “To a great extent”, 4 - “To a moderate extent”, 3 - “To some extent”, 2 - “To a small extent”, 1 - “Not at All”