OPTICOM OPERA ANALYZER - Manual
This information may be subject to change. All brand and product names are trademarks and/or
registered trademarks of their respective owners. All rights reserved.
Copyright © 2001 by OPTICOM GmbH · www.opticom.de
Technical Specification
for the OPERA™ Objective Perceptual Analyzer
OPR-1XX-XXX-P
This information may be subject to change. All brand and product names are trademarks and/or
registered trademarks of their respective owners. All rights reserved.
Copyright © 2001 by OPTICOM GmbH · www.opticom.de
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
1
Feature Overview
Voice Quality Measurement
•PESQ, 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 applications
•PSQM, perceptual speech quality measure according to ITU-T rec. P.861 [1996]
•PSQM+, advanced perceptual speech quality measure according to ITU-T COM 12-20
[1998]
•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
•Echo measurement based on real speech, Echo Return Loss ERLmom, ERLpeak, ERL vs. delay
•One way delay measurement, with PESQ also delay jitter vs.time
•Measurement under double talk conditions
•One way and two way measurements
•Bulk call generation
•H.323 interface functionality using Windows NetMeeting™ and audio interfaces
•Front-end clipping FEC measurement1(PESQ)
•Hold-over time HOT measurement1(PESQ)
•Background noise measurement1(PESQ)
•Utterances detection1(PESQ)
•Delay histogram1(PESQ)
•Signal-to-noise SNR measurement of speech and silence portions of a test signal
•User definable state machine support for E1 MFC-R2, E1 CAS-R2, T1 CAS
•Official ITU voice samples for testing and conformance verification
Audio Quality Measurement
•PEAQ, perceptual evaluation of audio quality according to ITU-R rec. BS.1387 [1999], Basic
and Advanced Model
•Result logging functionality, including user definable log intervals and quality score threshold
•Official ITU audio samples for testing and conformance verification
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
1Available Q4/2001
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
2
•On-line real time acquisition and analysis capability (PEAQ and PSQM)
•Comprehensive scripting interface
•Remote Control via IP
•DDLC™ improved timing accuracy (Dynamic Driver Latency Compensation)
•Play and record functionality for wide band audio and voice signals
•Trigger functionality for targeted analysis of on-line or long duration test signals (PEAQ and
PSQM)
•Graphical user interface
•Extensive scripting and command line options for automated testing
•Printing and graph exporting functionality
Graphical Displays
•Time signal displays, zoomable
•FFT Spectra displays, 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
Feature Description
PESQ Measurement
Description: Perceptual measurement of speech quality according to
ITU-T rec. P.862. Indicates call clarity. Results can be
directly compared to subjective listening tests. Capable of
handling varying delays and severe distortions as they
occure in VoIP applications.
Algorithm standard: Based on standard ITU-T rec. P.862
Sample rates: 8 kHz and 16 kHz
Sound file formats: WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: As defined by WAVE-format
Gain Compensation: Maximum gain difference = ±60 dB
Automated operation: Supported
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
3
Available Measurement Results: Timesignal,
Delay vs. Time,
PESQ MOS,
Jitter,
Minimum, maximum and average delay,
Front-end clipping FEC1,
Hold-over time HOT1,
Attenuation1,
Background noise1,
Signal-to-noise (SNR) measurement,
MOS of silent and speech portions,
Detailed analysis of silent and speech portions,
Utterances detection1,
Delay histogram1
Additional Features: File-based measurements,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
PSQM Measurement
Description: Perceptual measurement of speech quality according to
ITU-T rec. P.861. Indicates call clarity. Includes highly
optimized proprietary mapping from raw PSQM values to
P.800 Mean Opinion Score (MOS) scale. Results can be
directly compared to subjective listening tests.
Algorithm standard: Based on standard ITU-T rec. P.861
Sample rates: 8 kHz and 16 kHz
Sound file formats: WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: File-based: As defined by WAVE-format
On-line: )8((
232 plebitspersamfs∗
(e.g. ~12.4 hours at 48 kHz, 16 bit resolution)
Gain Compensation: Maximum gain difference = ±60 dB
Automatic Delay Compensation: ±1000 ms
Static Delay: Automatic Delay Compensation ±10 s
Automated operation: Supported
Available Measurement Results: Timesignal,
Spectrum,
Excitation,
Percentage of silent intervals during measurement (Silence),
1Available Q4/2001
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
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Percentage of time clipped frames during measurement
(Time Clipped),
Percentage of severely distorted frames during
measurement (Sev. Distorted),
PSQM according to P.861, silence weight = 0.0 (PSQM-
W0),
PSQM according to P.861, silence weight = 0.2 (PSQM-
W2),
PSQM according to P.861, silence weight = 0.4 (PSQM-
W4),
PSQM value of the silent intervals (PSQM-Silence),
Mean Opinion Score (MOS), silence weight = 0.0 (OMOS-
W0),
Mean Opinion Score (MOS), silence weight = 0.2 (OMOS-
W2),
Mean Opinion Score (MOS), silence weight = 0.4 (OMOS-
W4),
Mean Opinion Score (MOS) vs. Time,
Delay between the Reference Signal and the output signal
of the device under test,
Attenuation of the test signal compared to the reference
signal
Additional Features: File-based measurements,
On-line measurements,
Trigger functionality,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
PSQM+ Measurement
Description: Perceptual measurement of speech quality according to
ITU-T rec. P.861. Indicates call clarity. Includes highly
optimized proprietary mapping from raw PSQM values to
P.800 Mean Opinion Score (MOS) scale. Results can be
directly compared to subjective listening tests. PSQM+ is
optimzed for severe distortions, such as packet loss and
time clipping.
Algorithm standard: Based on standard ITU-T rec. P.861
Sample rates: 8 kHz and 16 kHz
Sound file formats: WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: File-based: As defined by WAVE-format
On-line: )8((
232 plebitspersamfs∗
(e.g. ~12.4 hours at 48 kHz, 16 bit resolution)
Gain Compensation: Maximum gain difference = ±60 dB
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
5
Automatic Delay Compensation: ±1000 ms
Static Delay: Automatic Delay Compensation ±10 s
Automated operation: Supported
Available Measurement Results: Timesignal,
Spectrum,
Excitation,
Percentage of silent intervals during measurement (Silence),
Percentage of time clipped frames during measurement
(Time Clipped),
Percentage of severely distorted frames during
measurement (Sev. Distorted),
PSQM according to P.861, silence weight = 0.0 (PSQM-
W0),
PSQM according to P.861, silence weight = 0.2 (PSQM-
W2),
PSQM according to P.861, silence weight = 0.4 (PSQM-
W4),
PSQM value of the silent intervals (PSQM-Silence),
Mean Opinion Score (MOS), silence weight = 0.0 (OMOS-
W0),
Mean Opinion Score (MOS), silence weight = 0.2 (OMOS-
W2),
Mean Opinion Score (MOS), silence weight = 0.4 (OMOS-
W4),
Mean Opinion Score (MOS) according to PSQM+
(OMOS+),
Mean Opinion Score (MOS) vs. Time,
Delay between the Reference Signal and the output signal
of the device under test,
Attenuation of the test signal compared to the reference
signal
Additional Features: File-based measurements,
On-line measurements,
Trigger functionality,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
PSQM/IP Measurement
Description: Same as PSQM and PSQM+. Includes advanced time
alignment algorithm to cope with static and variable
latencies, developed by OPTICOM (Delay Tracking
functionality).
Algorithm standard: Based on standard ITU-T rec. P.861
Sample rates: 8 kHz and 16 kHz
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
6
Sound file formats: WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: File-based: As defined by WAVE-format
On-line: )8((
232 plebitspersamfs∗
(e.g. ~12.4 hours at 48 kHz, 16 bit resolution)
Gain Compensation: Maximum gain difference = ±60 dB
Automatic Delay Compensation: ±1000 ms
Static Delay: Automatic Delay Compensation ±10 s
Delay Tracking: ±512 samples
Automated operation: Supported
Available Measurement Results: Timesignal,
Spectrum,
Excitation,
Percentage of silent intervals during measurement (Silence),
Percentage of time clipped frames during measurement
(Time Clipped),
Percentage of severely distorted frames during
measurement (Sev. Distorted),
PSQM according to P.861, silence weight = 0.0 (PSQM-
W0),
PSQM according to P.861, silence weight = 0.2 (PSQM-
W2),
PSQM according to P.861, silence weight = 0.4 (PSQM-
W4),
PSQM value of the silent intervals (PSQM-Silence),
Mean Opinion Score (MOS), silence weight = 0.0 (OMOS-
W0),
Mean Opinion Score (MOS), silence weight = 0.2 (OMOS-
W2),
Mean Opinion Score (MOS), silence weight = 0.4 (OMOS-
W4),
Mean Opinion Score (MOS) according to PSQM+
(OMOS+),
Mean Opinion Score (MOS) vs. Time,
Delay between the Reference Signal and the output signal
of the device under test,
Attenuation of the test signal compared to the reference
signal
Additional Features: File-based measurements,
On-line measurements,
Trigger functionality,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
7
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
Echo Algorithm
Description: Algorithm using real speech as stimulus for calculating
echo. Measures the Echo return Loss (ERL) in terms of
attenuation and delay values. Includes graphical
representation of the ERL vs. Delay.
Sample rates: 8 kHz and 16 kHz
Sound file formats: WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: As defined by WAVE-format
Gain Compensation: Maximum gain difference = ±60 dB
Maximum echo delay: 1000 ms
Frame size: 16 ms at 8 kHz
Averaging window size: 800 ms at 8 kHz
Automated operation: Supported
Available Measurement Results: Timesignal,
Echo Return Loss (ERL) vs. Delay,
Momentary attenuation of the highest echo peak (ERLmom),
Momentary delay of the highest echo peak (ERLmom
Delay),
Attenuation of the highest echo peak during the whole
measurement period (ERLpeak),
Delay of the highest echo peak during the whole
measurement period (ERLpeak Delay)
Additional Features: File-based measurements,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
PEAQ Algorithm
Description: Perceptual measurement of wide band audio according to
ITU-R rec. BS.1387. Includes the basic version of PEAQ,
defined for computational efficiency and the advanced
version yielding for highest possible accuracy. Detailed
analysis of test signals through BS.1387 model output
variables (MOVs).
Algorithm: Based on standard ITU-R rec. BS.1387
Sample rates: 48 kHz (according to recommendation ITU-R BS.1387),
44.1 kHz
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