OPTICOM OPERA SOFTWARE SUITE - V3.0 Manual

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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™ Software Suite V3.0

OPR-000-XXX-S

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

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

•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

•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

•File-based analysis capability

•Comprehensive scripting interface

•Trigger functionality for targeted analysis long duration test signals (PEAQ and PSQM)

•Graphical user interface

•Extensive scripting and command line options for automated testing

•Printing and graph exporting functionality

1Available Q4/2001

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

2

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

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

1Available Q4/2001

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

3

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: As defined by WAVE-format

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),

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,

Trigger functionality,

Printing and graph exporting functionality,

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

4

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: As defined by WAVE-format

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),

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,

Trigger functionality,

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

5

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

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

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,

Trigger functionality,

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

6

Printing and graph exporting functionality,

Includes official ITU voice samples for testing,

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

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

7

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

Automatic Delay Compensation: ±1000 ms (File-based measurements),

±500 ms (On-line measurements)

Static Delay: Automatic Delay Compensation ±10 s

Delay Tracking: ±512 samples

Automated operation: Supported

Available Measurement Results: Timesignal,

Spectrum,

Excitation,

Noise-to-Mask Ratio (NMR), averaged,

Noise-to-Mask Ratio (NMR) vs. Time,

Masked Threshold,

Loudness,

Objective Difference Grade (ODG), averaged (Advanced and

Basic Version),

Objective Difference Grade (ODG) vs. Time,

Distortion Index (DI), for the Advanced and the Basic Version,

Delay between the Reference Signal and the output signal of

the device under test,

Attenuation of the test signal compared to the reference

signal,

Modulation of the reference and test signal

BS.1387 intermediate results (MOVs): Average Bandwidth of the Reference Signal (AvgBwRef),

Average Bandwidth of the output signal of the device under

test (AvgBwTst),

Total Noise-to-Mask Ratio (NMRtotB),

Relative fraction of frames for which at last one frequency

band contains a significant noise component (RDF),

Average Distorted Block (=Frame), taken as the logarithm of

the ratio of the total distortion to the total number of severely

distorted frames (ADB),

Maximum of the Probability of Detection after low pass

filtering (MFPD),

Harmonic structure of the error over time (EHS),

Windowed averaged difference in modulation (envelopes)

between Reference Signal and Signal Under Test

(WinModDif1B),

Averaged modulation difference (AModDif1B),

Averaged modulation difference with emphasis on introduced

modulations and modulation changes where the reference

contains little or no modulations (AmodDif2B, RModDifA),

RMS value of the averaged noise loudness with emphasis on

introduced components (NloudB, NLA),

Averaged Linear Distortions (ALD)

TECHNICAL SPECIFICATION FOR THE OPERA™ SOFTWARE SUITE V3.0

8

Additional Features: File-based measurements,

Trigger functionality,

Result logging option, including user definable log intervals

and ODG threshold,

Printing and graph exporting functionality,

Includes official ITU audio samples for testing,

Includes PEAQ conformance test samples

System Requirements

Processor: Intel Pentium III, 500 MHz or above

RAM: ≥128 MB, 256 MB are recommended

Screen resolution: 1024*768,

≥64k colours

Graphics adapter: NVIDIA TNT2 ASUS AGP – V7100 SDRAM V5.33,

NVIDIA GeForce2 MX,

Matrox G400,

ATI 3D Rage IIC (GT-B3U1)

Various cards from ELSA (Erazor III Pro, Gladiac 511/MX),

Various cards from Diamond

Graphics memory: ≥8 MB

Operating system: Microsoft Windows NT4.0 SP4,

Microsoft Windows NT4.0 SP5,

Microsoft Windows 2000