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Echo, Delay, and Voice Quality Analysis
Over Wireless and Wired Networks

Gaithersburg, Maryland, USA – September 6, 2018- GL Communications Inc. a global leader in telecom test and measurement solutions, announced today insight into our Echo Measurement Utility Software (EMU) that measures Echo Path Delay (EPD) and Echo Return Loss (ERL) of voice calls. Echo can be as simple as sidetone, or more complex such as line echo or acoustic echo. The EMU when combined with GL’s VQuad™, T1 E1 Analyzers, MAPS™ Emulators, or Voiceband Analyzer, additional voice quality metrics such as round-trip delay (RTD), voice quality, and noise can also be measured.


Speaking to the press, Mr. Robert Bichefsky director of GL Communications Inc said “to provide a comprehensive assessment of voice quality irrespective of network type, GL has various tools combined together into one integrated platform consisting of VQuad™, Dual UTA HD,  T1 E1, and WebViewer™. This platform provides the ability to make VoIP, TDM, and Mobile calls from any fixed or mobile location. All interface flexibility is provided (2-Wire, 4-Wire, VoIP, TDM, and Mobile) within the Dual UTA and USB T1 E1 Analyzer. In addition, VQuad™ provides algorithms for signaling, voice transmission, and voice quality assessment. WebViewer™ provides the central point where voice metrics are stored and displayed through a WEB interface.”

He further added, “ Echo Measurement Utility (EMU) software within this architecture provides a means to assess sidetone, line, and acoustic echo and corresponding delays. EMU is an offline adjunct analysis application (under control of VQuad™, or as stand-alone) that compares the source and received files to determine echoes and delay of echoes.  GL’s EMU can also seamlessly work with other GL intrusive capture tools such as MAPS™ Emulators and T1/E1 Analyzers.”

Main Features:

  • Echo, delay, and voice quality analysis of voice calls in VoIP, TDM, 2Wire, 4Wire, and Mobile networks
  • Measures EPD in msec and ERL in dB
  • Compares source and received files to determine maximum of 4 echoes
  • Ability to automate the entire test process using VQuad™ scripting including sending the results to the central database for access via GL’s WebViewer™
  • EMU uses EMU Client software to automatically detect the incoming degraded voice files and send the measurements to database after analysis
  • Detailed offline analysis
  • Detect Acoustic/Line (Hybrid) echoes and evaluate intermittent echoes
  • Graphically displays source signal, received signal, error signal, and adaptive filter coefficients
  • Allows zoom-in on each graph, and exporting snapshot of these graphs to a file for later analysis
  • Calculates adaptive filter coefficients and echo characteristics for the error signal
  • Speaker option to play the audio files (intrusive and non-intrusive)
  • Option to zoom-in on any particular echo to investigate further

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