【from:http://support.teraquant.com/vendors/malden-electronics-ltd 】
The Speech Performance Viewer enables anyone to look at the results files generated by Malden Electronics’ Speech Quality Measurement Systems. Both the Digital Speech Level Analyser (
DSLA) and the Speech Performance Analyser (
SPA) can produce graphical and numerical data in .rst files.
Speech Performance SolutionsMeasuring speech quality — a guide to how we can help you get the best out of your network.
Application Guide DSLA-102Principles of Speech Quality Assessment using Objective Methods — describes Mean Opinion Score origins and how the speech quality metrics can be used with
DSLA to make meaningful measurements.
Determining the subjective speech quality of a transmission system has always been an expensive and laborious process. Now PAMS will provide a rapid and repeatable result in a few moments across any network, even those subject to packet loss or variations in delay.
Download a documentproviding background information onSpeech Quality Assessment, especially as it applies to the DSLA II orMultiDSLA platforms.
Determining the subjective speech quality of a transmission system has always been an expensive and laborious process. Now the tool described in ITU-T Rec. P.862 Perceptual Evaluation of Speech Quality — PESQ will provide a rapid and repeatable result in a few moments.
Speech Quality Solutions
A Guide to measuring speech quality in telephone and other transmission networks.
The Speech Performance Analyzer provides almost all the measurements that DSLA makes in a convenient package for codec developers and software engineers. The SPA dynamic linked library can be called from a user application program with reference and degraded filenames. The SPA returns key numerical data to the application program along with a wealth of detailed graphical information to a results file if desired.
You need to be registered with this site in order to download these files.
Download the 8.7MByte installer (for Windows 2000 and XP platforms only).
VoIP Monitor Professional is a software tool for non-intrusive assessment of speech quality and measurement of RTP/RTCP traffic parameters in VoIP networks. VoIP RTP packets arriving at a media gateway are subject to timing variations as well as loss and mis-sequencing. VoIP Monitor analyses the RTP traffic to produce real-time useful statistical data and predictions of speech quality across a single call or many calls. A calibration file, tailored to the gateway or VoIP terminal refines the speech quality prediction and gives a better correlated Mean Opinion Score (MOS) value than any other monitoring method. VoIP Monitor Professional is a maintenance and network monitoring tool designed specifically for operators of public and corporate VoIP networks, system integrators as well for companies developing and testing media gateways and other VoIP network components.
Download the MultiDSLA Product Brochure.
MultiDSLA is a highly scalable solution for the measurement of network speech transmission performance to meet the needs of Enterprises, Network Operators, Service Providers, System Integrators and Equipment Developers.
MultiDSLA sets up calls and makes measurements between any end points in the voice network. Tests occur according to a pre-defined schedule or on demand with a simple to use graphical representation of the network. Comprehensive speech performance testing has never been this quick, simple and free of test design errors.
Use the VoIP Virtual Terminal to place an endpoint anywhere in the VoIP network. The VoIP Virtual Terminal (VVT) is capable of originating or terminating a call using either SIP or H.323 protocol. The VVT IP address and other properties such as jitter buffer size are defined in the DSLA user interface and preserved in a schedule script. G.711 codecs are included.
The Codec Library Option adds G.729A/B and G.723.1 capabilities, with other codecs being added from time to time.
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