Echo Cancellation on Android and AudioRecord

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 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 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 […]

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 January 15, 2013

Background In the last couple of years the percentages of employees that work from home rapidly increases. There are three main reasons for this phenomenon: (1) Efficiency. No need to spend hours driving to/from the office and in many cases the amount of interrupts while at home is lower than at the office. (2) Cost. […]

Posted by admin
On December 7, 2012

Background Following our previous post on acoustic echo cancellation on flash calls, we got requests to improve audio quality also on conference calls that are based on flash technology. The case study that was described in the previous post dealt with audio quality for regular flash calls, and showed how to convert them to SIP […]

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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Echo Cancellation on Android and AudioRecord

Echo Cancellation on Android – synchronizing the input

Echo cancellation and public address systems

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

Audio Quality in Video Conferences

Flash Conference with Acoustic Echo Cancellation

Intercoms and Acoustic Echo Cancellation