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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.
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VoIP on Android – volume control

  • On January 16, 2016
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.  
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Echo Cancellation on Android and AudioRecord

  • On June 5, 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 ?  
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Echo Cancellation and silence

  • 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.
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Echo Cancellation on Android – synchronizing the input

  • On November 19, 2016
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. […]
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Extreme Noisy Environments

  • On November 19, 2016
Background Following our last post on the profile-based noise reduction technology, in this post we would like to cover few environments that suffer from extreme ambient noise. In these environments, many existing technologies are used to minimize the ambient noise. Unfortunately this is not enough and the output usually suffers from significant residual ambient noise […]
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Profile-Based Noise Reduction

  • On November 19, 2016
Background In this post we will review the evolution of this technology over the years. Initially this technology was introduced under the name of personal noise reduction.  Few months later the concept of out-of-the-box deployment with generic profiles was introduced. At the next step, we have renamed this technology to “profile-based noise reduction” based on […]
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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 […]
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Personal Noise Reduction – out of the box deployment

  • On November 19, 2016
Background The personal noise reduction software has proven to increase audio quality and MOS score in different noisy environments. This technology is using information on the speaker’s voice in order to separate it from the background noise and attenuate the latter. This powerful technology had one major drawback that prevented it from reaching mass deployment. […]
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Personal Noise Reduction Technology. Altruism or Egoism ?

  • On November 19, 2016
Background In the last post we have discussed the different options for using personal noise reduction in mobile phones. In this post we will elaborate on the expected value from using this advanced technology. Usually, when you purchase a new mobile phone, you are acting to the benefit of one’s self. You want to enjoy […]
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