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
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
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
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Available Q4/2001
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TECHNICAL SPECIFICATION FOR THE OPERA™ OBJECTIVE PERCEPTUAL
ANALYZER
• 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
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