VQT supports other international standard voice quality test methods including PESQ (ITU-T P.862), PESQ LQ / LQO (P.862.1), PESQ WB (P.862.2), PAMS (ITU-T P.800), and PSQM/PSQM+ (ITU-T P.861). This is the first time Voice Quality is added directly to the VQuad as an option.
POLQA, Perceptual Objective Listening Quality Analysis, based on ITU standard, ITU-T P.863, is the successor of PESQ (ITU-T P.862) analysis. POLQA supports the latest HD-quality speech coding and network transport technology with higher accuracy for 3G, 4G/LTE and VoIP networks.”
He added, “The POLQA algorithm avoids weaknesses of the current PESQ model and handles the higher bandwidth audio signals including wideband (WB, 300-3400 Hz) and super-wideband (50-14000 Hz). Further improvements of this algorithm include the handling of signals with many delay variations and support for assessment of speech signals recorded acoustically by HATS.
Similar to PESQ, POLQA is a Full Reference algorithm that rates a degraded or processed speech signal in relation to the original (reference) signal. POLQA analyzes the degraded speech signal sample-by-sample after a temporal alignment of the reference test signal. Perceptual differences between both signals are scored as differences. The perceptual psycho-acoustic model is based on similar models of human perception. Basically, the signals are analyzed in the frequency domain (in critical bands) after applying masking functions. Unmasked differences between the two signal representations will be counted as distortions. Finally, the accumulated distortions in the speech file are mapped into a 1 to 5 quality scale in accordance with MOS tests.”
Mr. Bichefsky further added, “The VQuad can be configured to automatically transfer the recorded speech file to the VQT central location. The VQT software can be configured to automatically analyze the voice files while sending the results (POLQA, PESQ, PAMS, PSQM) to the central database. Results associated with the POLQA analysis include POLQA MOS, E-Model, Signal Level, SNR, and Jitter measurements.
The results can be queried and displayed either in tabular or graphical format using the web-based WebViewer client.
Also, optionally POLQA can be added directly to VQuad software with support for automated testing within the VQuad script. In this scenario the degraded voice files remain at the VQuad node for analysis and are displayed within the VQuad software. Results can still be sent to the central database where VQT WebViewer can query and display either in tabular or graphic format.”
Other VQuad, VQT Enhancements:
•Support for Windows 7 32 bit and 64-bit versions
•Supports new data tests for Mobile devices
•Allows sending the results from manual tests to central database with ‘Send Results’ option
•FXO Call Progress detection supports Energy detection
•Option to connect to the VQuad behind the router to central DB.
•Added auto response on local VQuad event screen of far-end connection when bi-directional connection is performed. Also, adds ability to auto disconnect the bi-directional connection from the near-side device.
•Enhanced Scripting / Commands