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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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Poor Audio Quality with Hosted VoIP and Cloud-Based PBX

  • 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 […]
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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 […]
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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.
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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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Echo cancellation for browser-based Flash/Silverlight chat applications

  • On November 20, 2016
Browser-based chat applications Several of the vendors that develop audio/video chat applications decide to do it using Flash or Silverlight technology due to the following two advantages: 1.       The end-users do not need to install any additional software, except for the necessary plug-ins on their existing browser. 2.       The end-users can run the application on […]
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High Quality Recording of Streaming Audio

  • On November 20, 2016
Background From time to time you need to record streaming audio on your computer. One option is simply to activate your recording program while playing the streaming audio. The problem with this solution is that the quality of the recorded audio will be very low since you are not capturing the source of the audio […]
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Audio Quality When Using Speakerphone During Phone Calls

  • On November 20, 2016
  Background There are different scenarios in which calls are made using speakerphones. For example: In manufacturing floor where the employees want to have an open communication channel without the limitation of headset or handset. When using intercom devices. When more than one person needs to listen to the call (e.g. in conference rooms). When […]
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Acoustic Echo Cancellation and Sound Cards

  • On November 20, 2016
Clock Synchronization Acoustic Echo Cancellation (AEC) is a method of removing the echo from the audio signal captured by the microphone. This is done by using the audio that is played to the speakers as a reference audio signal. Most AEC algorithms require that both audio signals, i.e. the signal captured from the microphone and […]
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Noise Reduction and Echo Cancellation for existing VoIP Networks

  • On November 20, 2016
Background Many times we are asked for ways to cancel noise and improve audio quality in existing telephony networks.  The majority of the requests come from call centers and SMBs that are looking for simple plug-and-play solutions to resolve audio quality issues that they are facing.  Since most of these request arise for companies that […]
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