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Newsletter: GL Announces Powerfull New Tools for Measurement and Characterization of Echo, Noise, and Speech Levels

Welcome to the August Issue of GL Communication's Newsletter providing information and insight into the latest product introductions and reviews, and updates.

Voice calls may be subject to echo of various sorts - persistent echo or bursts of echo as the direction of conversation changes. Voice calls can also be subject to high levels of background noise, low volume, clipping, and various other impairments. When dealing with echo, today's networks make the job a little more difficult. They all introduce additional delays, which makes echo very annoying (see diagram depicting delays expected in different network configurations). Possible solutions to some of these problems are also outlined at this link.

As suggested in the above links, analyzing and measuring delay and echo in the tail network is most critical and requires appropriate tools in the field and back in the lab, including

  • The ability to capture Rout (original), Sin (echo), and Sout (canceled) signals simultaneously for later analysis, click here for Record/Playback details

  • The ability to capture the impulse response in real-time to determine the echo path delay (EPD), echo path loss (EPL), dispersion, speech and noise levels, and other characteristics of the echo path, click here for DEC details and

  • The ability to simulate the field conditions exactly in the lab, click here for DEC simulation document

GL has developed two powerful new tools, called Digital Echo Canceller and Active Voice/Noise Level Monitor to characterize echo, noise, and speech characteristics of voice connections. These tools are applicable whether the underlying network technology is PSTN, VoIP, ATM, Wireless, or Satellite.

Typical problems that are easily diagnosed are:

  • Echo path delays exceeding the EC's delay limit, click here for a diagram

  • Impulse response dispersion spans across EC's limit

  • NLP is turned off causing residual echo to be heard

  • Impulse response has unusual multipath components that the EC is unable to converge on

Shown in the diagram, is a typical use for the above issues,

For a complete discussion and details of the software, please visit the following links and We would be happy to consult with you on solutions to your testing needs and we look forward to hearing from you.

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