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J4630A VQT Undercradle for the Agilent Advisor 


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J4630A VQT Undercradle for the Agilent Advisor [Discontinued]

VQT Undercradle Features

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The VQT Undercradle, in conjunction with the Agilent Advisor, provides detailed measurements and analysis capabilities in an easy-to-read graphical presentation.


The VQT Undercradle is the most comprehensive voice quality analyzer in the industry, offering both PSQM and PAMS for measuring voice clarity, and supporting analog, interfaces.

The Perceptual Speech Quality Measurement (PSQM) provides a repeatable and objective measurement for voice quality, based on human perception factors. Designed for analysis of compressed voice, PSQM is a cognitive model that determines how people perceive speech quality. To account for severe distortions and time clipping as experienced in packet networks, the Telegra VQT uses an enhanced version of PSQM, known as PSQM+.

The Perceptual Analysis Measurement System (PAMS) is a valuable tool for providing an objective measurement of speech quality. It uses a perceptual model based on human hearing factors, and provides a repeatable, objective means for measuring perceived speech quality. PAMS uses a different signal-processing model than the ITU P.861 standard PSQM, and produces different types of scores. It provides a "Listening Quality Score" and a "Listening Effort Score", both which correlate to MOS scores on a 1-5 scale.

In addition to the listening scores, the VQT provides a graphical representation of signal loss and additive distortion over both the time and frequency domains of the test signal. This is known as the error surface. The error surface shows the impacts of a wide range of network-induced distortions, including coding distortion, front-end clipping, muting, noise, and bit or frame errors. The amplitude of errors is related to how audible and annoying they will be.

The VQT is also the only product that measures the impact echo has on voice quality. In addition to measuring the duration, level, and delay of echo in transmitted speech, the VQT measures the perceived annoyance by applying the PSQM+ model to speaker echo.

The VQT supports analog FXO and E&M interfaces.

VQT Measurements & Tools
Voice Delay More
Clarity using PSQM+ More
Clarity using PAMS More
Echo - Perceived Annoyance Caused by Echo More
Echo - Doubletalk More
Silence Suppression Analysis: Voice Activity Detector Front-end Clipping and Hold-over Time, Comfort Noise Generation More
DTMF Tone analysis More
Impulse Response
Network Simulator
File Play and Record
Noise Generator
Tone Generator
Port Loopback

VQT Features

Provides on-line and offline PAMS measurements
Provides on-line and offline PSQM+ measurements
End-to-end and round-trip measurement capabilities
Trending measurement capabilities
Graphical and numerical presentation of test results
Capture and analyze network characteristics
Easy to use: Novices can begin testing right out of the box
Detailed configuration and analysis capabilities for experts
Automated testing! Let your experts design the tests for execution by anyone, anywhere
Logs all test results, including graphical data
Additional features

Provides 1 millisecond resolution on delay, front-end clipping, and echo duration measurements
Provides clarity measurements using the Perceptual Analysis Measurement System (PAMS)
Provides graphical representation of the PAMS error surface, including signal loss and additive distortion over both the time and frequency domains
Performs clarity measurements using an enhanced version of ITU P.861, known as PSQM+
Measures and presents PSQM+ scores for the entire duration of the test sample, not just an average. Spikes in a score can indicate transient impairments such as packet loss
Applies PSQM+ to measure the impact of echo on speaker clarity
Echo tests with user-configurable delay and level of echo signal simulation