Voice Quality Testing Solutions
GL Communications, a global leader in telecom test and measurement solutions, addressed the press regarding their Voice Quality Testing (VQT) Solutions for fixed, mobile, and IP-based networks using POLQA and PESQ standards.
“GL’s VQT software utilizes widely accepted
algorithms to provide measurements of voice quality over all types of networks
including ATM, VoIP, PSTN, and Cellular. It supports next-generation VQT
algorithms for IP networks using Perceptual Objective Listening Quality
Analysis (POLQA) per ITU-T P.863, and Perceptual Evaluation of Speech Quality
(PESQ) per Rec. P.862.1 and P.862.2”, said Robert Bichefsky, Director of
Engineering at GL Communications.
“The PESQ algorithm provides an objective measurement of subjective listening
tests on telephony systems. The POLQA algorithm is a next-generation voice
quality testing standard for fixed, mobile, and IP-based networks and supports
the latest HD-quality speech coding and network transport technology, with
higher accuracy for 3G, 4G/LTE, 5G, and VoIP networks including OTT apps and
VoWiFi”.
He further added, “The GL VQT software is a
standalone product that can be configured for fully automated operation. Once
the VQT application detects a PCM/WAV voice (degraded voice) file in a
user-specified directory, the VQT software will automatically apply the algorithm
against the reference and degraded PCM/WAV voice files and compute a Mean
Opinion Score (MOS). In addition, the GL VQT software can be remotely operated
using the CLI and API functions supporting WinOS, Linux, and macOS. The results
of the VQT algorithm are reported directly in the stand-alone VQT application
while also being saved to VQT log files. These results can also be sent to a
Central Database where GL’s web-based dashboard, known as WebViewer™, is deployed.
This gives the user a convenient web interface for easy monitoring and remote
control of the entire voice quality test”.
Important Features
- Test
voice quality over all types of telecom networks—Wireless, VoIP, TDM, and
PSTN
- Updates
associated with POLQA v3 include a redesigned perceptual model for Full
Band Audio analysis which is validated for VoLTE, 5G, and OTT apps
(supporting EVS and OPUS codecs)
- Evaluate
audio quality using the VQT MOS and E-Model along with additional metrics
including SNR, Jitter, Clipping, Signal Level, Noise Level, and Delay
measurements
- Manual
or Automated modes of operation with centralized data access. Automatic
Mode allows the VQT software to automatically analyze files from a
user-specified directory
- Remote
control of the VQT application using the supplied CLI and API functions
supporting WinOS, Linux, and macOS
- Analyze
12-bit degraded files with 16-bit Reference files
- Analyze
the effects of Codec Compression in Wireless Networks
- Supports
POLQA ITU-T P.863 for
next-generation voice quality testing supporting NB (8000 sampling), WB
(16000 sampling) and SWB (Super Wideband) (48000 sampling)
- VQT
POLQA and PESQ supports analysis of 8-bit compressed a-Law and mu-Law
files
Source: GL Communications media announcement
