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Echo in Public Address systems – additional considerations

  • Posted by admin
  • On October 14, 2015
Background This post is a continuation to our previous post on  AEC and Public Address systems. This post elaborates on additional considerations that should be reviewed when implementing and tuning acoustic echo cancellation software in PA systems. After analyzing relevant case studies, out of many important considerations, we have selected the below ones.
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Echo cancellation and public address systems

  • Posted by admin
  • On July 14, 2014
Background When you hear the words echo or echo cancellation, you probably imagine a scenario in which two people are talking over the phone and one of them hears his/her echo. Indeed this is the most common scenario in which echo appears and echo cancellation mechanisms are being used.  In this post we would like […]
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Echo Cancellation, Art or Science? Part V

  • Posted by admin
  • On December 6, 2013
Background In the previous posts of this series we discussed the challenges of echo cancellation algorithms with respect to: 1. Echo path search . 2. Echo invalidation. 3. Howling effect. 4. Saturation. In this post we will discuss a common implementation issue we have seen many times – audio stream synchronization.
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Tips for Installing PBXMate in a Distributed VoIP Network

  • Posted by admin
  • On February 3, 2013
Background Many VoIP network administrator face a common problem that their users complain about the quality of their phone calls. The most common complains are about noise, echo and other artifacts. If the network is distributed, it becomes very difficult to analyze and control the multiple components in the network starting from the end devices […]
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Echo Cancellation with Flash – A Case Study

  • Posted by admin
  • On September 7, 2012
Background From time to time we are getting requests to improve audio quality in flash calls and mainly to help remove echo. In a previous post, Echo Cancellation with Flash Clients, we discussed few techniques that could be helpful. In this post we show a case study for integrating a centralized audio filtering to improve […]
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Echo Cancellation, Art or Science? Part II

  • Posted by admin
  • On July 20, 2012
Background In the previous post on acoustic echo cancellation we discussed the importance and the challenge in handling of the echo path. In this post we will discuss a different aspect that echo cancellation algorithm must handle. It is not rare that users change the setting of their audio device during a call. For example […]
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Echo Cancellation, Art or Science? Part I

  • Posted by admin
  • On July 1, 2012
Background First, let us apologize that this post is going to be a bit technical. Don’t worry we will try to keep it as simple as possible.  Echo cancellation, and more specifically Acoustic Echo Cancellation (AEC) is theoretically a very simple algorithm. The AEC algorithm receives a reference signal (i.e. the audio played to the […]
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