Voice Quality
Measurement
•
PESQ
, the new state-of-the-art
perceptual evaluation of speech
quality according to
ITU-T rec.
P.862
[2001], combines PSQM
with PAMS, optimized for VoIP
and hybrid end-to-end applica-
tions, MOS and MOS-LQ calcu-
lations. PESQ wideband func-
tionality (PESQ-WB) is also
included.
•
PSQM/IP
, perceptual speech
quality measure according to
ITU-T rec. P.861
[1996], incl.
advanced delay compensation
for end-to-end measurements,
developed by OPTICOM
•
PSQM+
, advanced perceptual
speech quality measure accord-
ing to ITU-T COM 12-20 [1998]
•
Echo
measurement based on
real speech, Echo Return Loss
ERLpeak, ERL vs. delay
•
Transmission Rating Factor R
according to ITU-T G. 107 (E-
Model), available with PESQ only
•
One way delay measure-
ment,
with PESQ also
delay
jitter vs. time
and delay
distribution
• Measurement under
double
talk
conditions
• One way and two way
measurements
•
Bulk call
generation
•
H.323
interface functionality
using Windows NetMeeting
™
and audio interfaces
•
VAD analysis,
Front-end
clipping
FEC,
hold-over time
HOT
and dropout measurement
•
Background noise
measurement
• Signal-to-noise
SNR
measure-
ment of speech and silent parts
of a test signal
• User definable state machines
supported for E1 MFC-R2,
E1 CAS-R2, T1 CAS
Audio Quality
Measurement
•
PEAQ
, perceptual evaluation
of audio quality according to
ITU-R rec. BS.1387
[1999],
Basic and Advanced Model
•
48 kHz
and
44.1 kHz
sampling
rates supported
• Result logging functionality,
including user definable log
intervals and quality score
threshold
• Trigger functionality for
targeted analysis of on-line
or long duration test signals
Common Functionality
• Advanced delay compensation
for end-to-end measurements,
suitable for constant and vari-
able delays (VoIP), developed by
OPTICOM
• Delay measurement with real
speech/music. Results in sam-
ples as well as ms
• Attenuation measured in dB
• On-line real time acquisition
and analysis capability
• Comprehensive scripting inter-
face
• Remote Control over IP
•
DDLC
™
improved timing
accuracy (Dynamic Driver
Latency Compensation)
• Play and record functionality
for wide band audio as well
as voice signals
• Easy-to-use graphical user
interface
• Extensive scripting and
command line options
OPERA
™
Control Center:
Easy Scheduling and
Remote Control
Functionality
• User friendly graphical interface
for setting up a schedule of test
calls between OPERA
™
systems
• Automated remote control
of a single or various OPERA
™
systems via IP connection
• More than 3.000 measurements
per day, more than 20.000
BHCA (call attempts per hour)
• Automatic synchronisation and
allocation of the resources
• Commands may be automatically
repeated and rescheduled after
a certain time (e.g. every
Monday)
• Applicable to telecom and wide
band audio applications
• All result values as in the voice
and audio quality measurement
functionality are available
(except for graphical diagrams),
like PESQ, PSQM/IP, PSQM+,
PEAQ, Echo scores etc.
• PDD measurements (Post dial
delay)
• Total call duration measure-
ments
• Termination cause indicator
• All measurement results avail-
able at a glance
• Result view filtering by connec-
tions and/or QoS results (e.g.
only connections with poor
listening quality are shown)
• Measurement results may be
exported to any spread sheet,
data base program or network
management system for further
analysis
• Statistics and charts
Graphical Displays
• Time signal displays, zoomable
• FFT Spectra, zoomable
• Excitation and various psycho-
acoustic parameters, like NMR,
Masked Threshold and
Loudness
• Audible distortion measurement
• Result summary display with
MOV, PSQM MOS, PESQ MOS
and PEAQ ODG numerical
scores and bar graphs
• Delay Jitter vs. Time min/max
scores and graph (PESQ)
• Echo Return Loss vs. Delay
• and many other features (list
not comprehensive).
Interfaces
• Four port analog POTS inter-
faces
• Dual- or quad-port E1/T1 trunk
interfaces, fully software con-
figurable for a variety of proto-
cols: ISDN PRI, E1 MFC-R2 CAS,
E1 CAS-R2, T1 CAS/Robbed Bit,
both, FXO and FXS types. 120
Ohm RJ48C, optional adapter
kit for 75 Ohm Coax
• Professional stereo 24 bit ana-
log/digital audio interfaces, XLR
balanced, AES/EBU. With
optional multimedia adapter kit
also applicable to VoIP ter-
minal and IP phone testing
•
Interfaces can be freely
combined
in a system
Key Functionality at a Glance
