How can echo suppression badly impact call quality ?

Posted by admin
On January 1, 2016

Background Can phones/soft-phones with built-in echo suppression badly impact the audio quality? Surprising as it may sound the answer is positive. In other words, when a call center, or any other organization, purchase phones with built-in echo suppression it is jeopardizing the overall call quality. In order to analyze the reason for this phenomena we […]

VoIP on Android – volume control

Posted by admin
On August 3, 2015

Background In our previous posts we covered few of the difficulties that Android VoIP developers are facing – for example the challenge in providing high quality echo cancellation. In addition to the echo cancellation, the variety of hardware platforms that are running Android also introduces a challenge in controlling the volume of the voice.

Posted by admin
On May 22, 2015

Background When developing a VoIP application, most implementations use AudioRecord as the foundation class for capturing audio from the microphone. Can this class be used to cancel echo as well ?

Posted by admin
On March 11, 2015

Background Following our previous post on synchronization, in this post we would like to cover a specific aspect of un-synchronized input which causes the speakers to play silence that is not monitored and therefore unknown to the AEC.

Posted by admin
On January 1, 2015

Background In this post we will discuss the challenge of synchronizing the audio that is given as the input to the echo cancellation software running on Android. This post is a continuation to a blog series we published on echo cancellation and specifically on the post that deals with importance of synchronization in echo cancellation. […]

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.

Posted by admin
On April 10, 2013

Background In the previous posts of this series we discussed the challenges of echo cancellation algorithms to efficiently handle the echo path, the complexity introduced by echo invalidation and the howling effect. In this post we will discuss another important aspect with regards to echo cancellation called Saturation.

Posted by admin
On March 10, 2013

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 […]

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 […]

Posted by admin
On November 12, 2012

Background One of the disturbing problems that appears when using intercoms, or other low-end full-duplex communication devices, is the generated echo. Usually the echo is significant in these situations due to the following two reasons:

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How can echo suppression badly impact call quality ?

VoIP on Android – volume control

Echo Cancellation on Android and AudioRecord

Echo Cancellation and silence

Echo Cancellation on Android – synchronizing the input

Echo Cancellation, Art or Science? Part V

Echo Cancellation, Art or Science? Part IV

Why Echo Cancellation for Android is a Difficult Task?

Tips for Installing PBXMate in a Distributed VoIP Network

Intercoms and Acoustic Echo Cancellation