Echo Cancellation, Art or Science? Part V

On December 4, 2021

Background [EDITED] The following blog post provides an overview on all major components that are required when building/designing an echo cancellation software. In this post we will discuss a common implementation issue we have seen many times – audio stream synchronization.

AI, Can you identify echo?

On March 15, 2021

Acoustic Echo in phone calls is caused when audio that is being played on the loudspeakers is then picked up by the microphone and afterwards transmitted to the far-end person who is talking. As a result the far-end talking person will hear himself/herself in a delay. When echo appears in a phone call it is […]

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 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 […]

On November 19, 2016

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 […]

On November 18, 2016

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 […]

On November 18, 2016

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 […]

Echo in Public Address systems – additional considerations

On January 16, 2016

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.

Echo Cancellation, Art or Science? Part V

AI, Can you identify echo?

Echo cancellation and public address systems

Echo Cancellation with Flash – A Case Study

Tips for Installing PBXMate in a Distributed VoIP Network

Echo Cancellation, Art or Science? Part II

Echo Cancellation, Art or Science? Part I

Echo in Public Address systems – additional considerations