Opticom OPERA BROCHURE

OPERA

YOUR DIGITAL EAR!

Voice/Audio Quality Analyzer

The Objective Perceptual Signal Quality Analyzer setting the Standards

Comprehensive, end-to-end
quality analysis based on
perceptual measurement

The OPERA™Voice/Audio Quality
Analyzer represents the latest
developments to objectively eva­luate and assure the quality of
compressed voice and wide-band
audio signals, based on modeling
the human ear
can achieve a comprehensive ana­lysis of the end-to-end quality of
today's and next generation net
works, such as 3G V
VoATM, ISDN, GSM, POTS, from
the caller to the callee. Also, you
can test the audio quality of com
pression formats such as MP3,

. With OPERA you

oDSL,

, V

oIP

-

AAC, AC3, Microsoft Windows
Media, from the studio source to
the receiver, or from the server to
the client.
For the test engineer, one of the
issues is how to apply a computer
model of the human ear to a test
circuit, or to a live network envi­ronment. For this reason, OPTICOM
developed OPERA as an open, easy
to configure hardware platform
that can process perceptual
models, which are implemented

-

just by software. The basis of the
OPERA system is a portable 'lunch

box' type of PC host system. Four
slots can take various kinds of
interfaces. Alternatively, OPERA is
now also available in a rack-moun­table form factor. For R&D and lab
applications, a cost effective soft­ware-only version with reduced
functionality is offered, as well.
Supported Operating Systems

™

Microsoft Windows NT

are
Windows™2000, Windows™XP
Windows™2003.

,

,

Key Functionality at a Glance

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

AMS, optimized for VoIP

with P
and hybrid end-to-end applica­tions, MOS and MOS-LQ calcu­lations. PESQ wideband func­tionality (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 accord­ing 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 (E­Model), available with PESQ only

• One way delay measure-
with PESQ also delay

ment,
jitter vs. time

distribution
Measurement under

•

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

ment of speech and silent parts
of a test signal

and delay

double

™

SNR measure-

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 vari­able delays (VoIP), developed by
OPTICOM

• Delay measurement with real
speech/music. Results in sam­ples as well as ms

• Attenuation measured in dB

• On-line real time acquisition
and analysis capability

• Comprehensive scripting inter­face

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 measure­ments

• Termination cause indicator

• All measurement results avail­able at a glance

• Result view filtering by connec­tions 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 psycho­acoustic 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 inter­faces

• Dual- or quad-port E1/T1 trunk
interfaces, fully software con­figurable for a variety of proto­cols: 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 ter­minal and IP phone testing

• Interfaces can be freely
combined in a system

-

User definable state machines

•
supported for E1 MFC-R2,
E1 CAS-R2, T1 CAS