How to evaluate an echo cancellation algorithm?

On March 25, 2018

When you encounter an echo problem in your application, network or devices it is obvious you need to introduce an echo canceller. Your next step is to explore at least two possible locations for performing the echo cancellation: cancelling the echo on the client side or doing it on the server side. The decision […]

Installing PBXMate with Elastix

On September 7, 2017

[Important Note]: New versions of Elastix no longer support add-ons technology. To install PBXMate with new version of Elastix we offer our plug-and-play technology that works out-of-the-box with Elastix. For details, please visit PBXMate page. Background As recently announced, the PBXMate is now an Addon to Elastix. As a result, installing PBXMate with Elastix […]

Echo Cancellation with negative echo tail

On May 7, 2017

Background Echo path/tail is one of the most fundamental parameters when performing echo cancellation. In previous posts, we elaborated on the importance of echo tail and we also provided a Do It Yourself (DIY) method to calculate the echo tail. In most usage scenarios, the value of the echo tail will be a positive one […]

Audio Quality for Elastix

On April 7, 2017

Background The Elastix users enjoy from a powerful unified communication system with very professional graphical user interface that provides a friendly way for monitoring and control the system. The powerful system together with the the ease-of-use is one of the main reasons that attract customers into using Elastix. [EDITED] New versions of Elastix no longer […]

Echo cancellation and public address systems

On January 13, 2017

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 […]

On December 25, 2016

Background The hosted VoIP service is gaining popularity like other cloud-based infrastructure services. SMBs prefer hosted VoIP solution to cut down costs and operational overhead. In addition many providers offer attractive build-in features on top of the standard service. As opposed to other IT services, VoIP is more delicate and if not handled correctly it […]

On December 14, 2016

Background In this post we will describe a simple method for evaluating the power of the innovative profile-based noise reduction technology. This method does not provide optimal professional results but it can be used for preliminary evaluation. Companies that are interested in a more professional evaluation should contact us. In this post we will describe […]

Echo Cancellation with Flash – A Case Study

On December 12, 2016

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 […]

Time manipulation and its impact on echo cancellation

On December 12, 2016

Background Time manipulation is a known technique in audio processing. It can be used to either compress the audio (resulting in speed-up) or expand the audio (resulting in slow-down). Usually this is done without altering the pitch and therefore without changing the fundamental signature of the voice.

Why Echo Cancellation for Android is a Difficult Task?

On December 12, 2016

Background SoliCall offers different software solutions for audio quality improvements. One of the areas with an increasing demand is the need to solve echo issues with Android devices. As discussed in few of our previous posts on echo cancellation, in real-life conditions performing a good echo cancellation is a rather complex task. In addition, it […]

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