Teraquant has been Malden’s partner in the USA and Canada since 2005. Bringing 23 years of experience in speech quality assessment, we work closely with our many customers to ensure that Malden’s accuracy and excellence is made available to your wide range of voice and audio test needs.

Malden Electronics Ltd is now rebranded under Opale Systems.

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Making Accurate Voice Quality Measurements

Opale Systems produces the most accurate measurement of PESQ (ITU-T Recommendation P.862) and POLQA® (ITU-T Recommendation P.863) available worldwide today. We also provide the most accurate measurement of one-way delay for a voice path available, based on the delay of the audio and not just delay of packets across an IP network.

Malden, now Opale, was the first to launch the new POLQA standard on a test platform when it was introduced on the MultiDSLA speech-quality tool in 2011.

Opale Systems MultiDSLA also provides unique analytics, drilling deep into the POLQA metrics to provide insight on what is going wrong when you get poor scores.

The POLQA algorithm was introduced to deal with some of the weaknesses inherent in PESQ, as well as to address Wideband telephony, or HD voice (ie: voice communication above 3.4kHz).

You should consider testing with POLQA if you:

  • Are using either Wideband or Super-Wideband codecs (7–24kHz analog bandwidth), sometimes known as High Definition audio.
  • Use codecs that employ time-warping (eg: CDMA or EVRS).
  • Work with CDMA terminals and/or networks.
  • Have a network that uses AMR codecs.
  • Are testing through acoustic interfaces.
  • Are concerned about voice quality enhancement and noise reduction devices/processes.

The principle is similar to PESQ — comparing the clean reference file with the degraded file from the network — but the test methodology is different. POLQA has two models, one for Narrowband and one for Super-Wideband. The Super-Wideband model can be used for any network from 300–24,000Hz analog bandwidth. The Narrowband POLQA algorithm is for legacy telephony on networks up to 3.4kHz, and provides compatibility with PESQ NB and narrowband subjective test data.

MultiDSLA makes it easy to use POLQA. Malden’s long experience in the application of speech quality metrics, inherited by Opale, ensures that you will be getting useful results as soon as the option is enabled on your MultiDSLA system.

Perceptual Objective Listening Quality Analysis

What is POLQA?

Perceptual Objective Listening Quality Analysis (POLQA) is the latest objective measurement for speech quality standardized in 2011 (ITU-T P.863). POLQA is an enhancement to the PESQ algorithm (ITU-TP.862) introduced in 2003 which allowed perceptual speech quality measurements to become a mainstream method to evaluate end-to-end speech clarity. Perceptual speech quality measurements are needed when speech is compressed such as in a voice codec (eg: G.729, G.711, G.726, etc) and then transported over wireless or IP-based networks.

Why Is It Useful?

The main driver for the new POLQA standard was wideband telephony sometimes called HD-voice as defined by the G.722 and G.722.1 (wideband AMR). In addition, POLQA analyzes speech to the limit of the human ear (20 kHz analog bandwidth). The POLQA algorithm supports measurements from the narrow band (NB,300–3,400Hz, traditional PSTN telephony), wideband (WB, up to 7kHz), super-wideband (SWB, 50–14,000Hz)and Fullband (FB, 50–24,000Hz).

A System for Making the Most Accurate POLQA Measurements

The Opale Systems DSLA (made famous worldwide as Malden) supports the full range of perceptual speech quality measurements:

  • POLQA (ITU-T P.863) versions 1.1 and 2.4
  • MOS, E-Model (ITU-T G.107)
  • PESQ (ITU-T P.862)
  • PESQ LQ /LQO (P.862.1)
  • PESQ WB (P.862.2)
  • PAMS (ITU-T P.800)

…as well as the full range of traditional voice measurements, such as:

  • Voice Quality or Speech Clarity
  • Voice Power Level
  • Echo (Level and Delay)
  • DTMF
  • One-way Voice Delay/Latency
  • Frequency Response NB/WB/SWB/FB
  • Signal Level
  • Noise Level

Why is Accuracy Important?

  1. Accuracy avoids the cost of chasing and repairing a problem which has no impact on quality or user experience.
  2. Accuracy allows you to pin-point the real cause of bottlenecks in your system.
  3. Accuracy prevents you from failing a good product.

Test Applications

Device Testing

  • Voice Codec performance.
  • Compare different algorithms and implementations.
  • Bandwidth required to achieve a given level of voice quality.
  • Packet Loss Concealment mechanisms.
  • Determine capacity of devices such as gateways sharing DSP resources between voice streams.

Network Test and Monitoring

  • Isolate network elements contributing to poor voice quality.
  • Baseline current voice quality to set realistic goals for VoIP migration.
  • Monitor voice SLA’s.
  • Provide objective acceptance criteria.
  • Eliminate good networks from bad networks.

Devices to be Tested

  • Handsets and Mobiles for cellular, WiFi and VoIP.
  • VoIP gateways.
  • Any device with a voice codec (eg: VoIP endpoint or transcoder).

For further information, click here to request more information.

You might also want to check our whitepaper A Practical Guide to Troubleshooting Poor Speech Quality – End-to-End.

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