Cisco Cisco IP Phone 8841 Weißbuch
*This document is a summary report. For full description of listening test, please refer to the document
“‘SenseLab 005-13”.
“‘SenseLab 005-13”.
The report must not be reproduced, except in full, without the written approval of DELTA.
Title
Summary Report - Listening Test on Teleconference Devices
Journal no.
Project no.
Our ref.
SenseLab 009-13
I100245
JRA, SVL, TOS
Client
Cisco
50 W Tasman Dr
San Jose, CA 95134
50 W Tasman Dr
San Jose, CA 95134
Summary
A two-part listening test was performed on recordings of the Cisco® Unified IP Conference
Phone 8831 (CP-8831) and Polycom SoundStation IP 7000 (IP 7000).
Phone 8831 (CP-8831) and Polycom SoundStation IP 7000 (IP 7000).
Industry-standard listening test methodologies were applied in assessing different aspects
of the perceived audio quality on these recordings.
of the perceived audio quality on these recordings.
The results from the listening tests overall showed statistically significant better performance
of the CP-8831 over the IP 7000.
of the CP-8831 over the IP 7000.
The largest difference between the two products was found in the uplink situation, where the
evaluation of the background noise showed strong performance of the CP-8831 over the IP
7000.
evaluation of the background noise showed strong performance of the CP-8831 over the IP
7000.
Figure 1 shows the results (error bars on the figure include 95-percent confidence intervals),
and
and
Figure 2 shows the uplink mean score ratings for the three test questions related to:
distortion of speech signal, level of background noise, and overall quality as averaged
across the three test locations and languages and experiment conditions.
across the three test locations and languages and experiment conditions.
Figure 1 Receive-End Mean Score Ratings Averaged Between Test Locations and
Experimental Conditions
Experimental Conditions