Overview |
Main Features |
Application Diagrams |
Waveform/Spectral Viewer
Voice Quality Testing (VQT) Results |
Buyer's Guide
Overview:
Wireless networks can impair voice quality by various means including poor mobile phone quality, voice compression and decompression algorithms,
delay, loss or gain in speech levels, noise, acoustic and landline echo, and other distortions. GL provides a compact and portable solution for Wireless phone
and Mobile Radio testing.
GL's VQuad™ along with the Dual UTA combined with GL's Voice Quality Testing (VQT PESQ) software permits this simple "end-to-end assessment" in an
efficient, portable, and hassle-free product. Results include Mean Opinion Scores (MOS), which provide an excellent overall measure of end-to-end voice quality
and detailed measurements provide focused measurements of specific impairments.
GL's VQuad™ along with the Dual UTA and VQT software as a complete package forms a compact and portable solution. Geographically separated
locations connected to the wireless network via mobile phones can be easily configured for sending reference voice files and recording the received degraded file,
thus allowing end-to-end path analysis. The VQuad™ GUI acts as the engine for synchronously transmitting and recording voice files ("reference"
and "degraded" files) across a wireless connection. This solution is especially useful during VQT Drive Testing. VQT software
provides the MOS and other detailed measurements for each recording.
The VQuad™ supports full Call Control included supplementary services such as 3-Way Calling. The VQuad™ also supports path confirmation,
send/record voice synchronously for VQT PESQ results and full scripting of the test. Additional measurements include Round Trip Delay, One Way Delay and a
variety of Echo testing.
Main Features:
- Complete Wireless Solution includes Drive Testing capability.
- Compact and portable solution for testing mobile end-to-end voice quality
- Synchronized software for sending/recording of voice files
- Automated Testing of Mobile Radio and Wireless Phones (Wi-Fi, WiMax, Bluetooth) using Dual UTA
- Mobile Phone call control supports Bluetooth™, and 2.5mm Audio Headset Jack interfaces
- BlueTooth™ compatible for both Call Control as well as Audio Send/Record.
- Control Mobile Radios with Push-to-Talk functionality; Supports radio keying and send/record audio
- Additional measurements include Mean Active Speech Level, Noise Level, Latency and Clipping
- Results available in real-time or post-processing
- Compatible with automated GPS location timestamping
- Automatic One-Way Delay (OWD) & Round Trip Delay (RTD) measurements with results sent to GL VQT database
Application Diagrams
- Wireless typical hardware configuration
- Network Delay Measurement
The Dual Universal Telephony Adapter (UTA) features a built in Round Trip Delay (RTD), One Way Delay, and variety of
Echo measurements capabilities. Basically the Dual UTA has two ports (side 1 and side 2) supporting any two telephony combination for the single unit.
Dual UTAs can automatically determine the RTD, regardless of what network they may be analyzing. A one-way delay measurement is also achievable using
the Dual UTA. Network Delay Measurements can be performed while both network end points are collocated or geographically separated.
- Digital Echo Measurement System adapted for analog interfaces
This system consists of a portable PC system with a Dual UTA unit. The Dual UTA unit has 2- wire analog interfaces so mobile phones, landline, and VoIP
phones can be easily connected. This system can perform manual echo, delay, Acoustic Echo, and voice quality measurements, depending on optional features
desired.
- SIP Call Generator and Call Analyzer to Mobile Phone
This system connects at the digital level (Ethernet 10/100) and at the analog level. It can perform call generation and
analysis of VoIP Calls and VQT measurements to/from the mobile.
- Mobile Radio Testing
The Dual Universal Telephony Adapter (UTA) has the ability to interface to a mobile radio, thus allowing for voice quality testing. Control of the Push-to-Talk
(PTT) feature is available with the Dual UTA and the VQuad™ software. Directly before the audio file is transmitted the VQuad™ software will
command the Dual UTA to enable the PTT on the radio. This feature makes the testing completely automated and hands free.
Screen Shot of VQuad™ with Call Control
Screen Shot of Script Editor Window
Waveform/Spectral Viewer
The GL VQT software can be user-configured to provide a rating of each measurement based on the scores, latency, clipping, etc.
A poorly rated measurement can be viewed in graphical format using the waveform viewer.
Dropouts, noise and other impairments can be examined here.
Screen Shot of Waveform/Spectral Viewer
Voice Quality Testing (VQT) Results
GL's VQT may be executed automatically (real-time and/or post-processing) or manually by entering a Reference File and Degraded
File. Regardless of how GL's VQT is initiated, algorithms for PAMS, PSQM, PSQM+, PESQ MOS and PESQ LQ are executed simultaneously
for the two voice files and results are shown graphically as well as in a tabular format. GL's VQT also displays cumulative statistics for
large scale testing over long periods of time.
Screen Shot of PESQ Measurement Window
Screen Shot of VQT Measurement Results
Screen Shot of VQT Cumulative Statistics
Buyer's Guide:
* Specifications are subject to change without notice.
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