Cancelling Ambient Noise in Telephony

  • On February 13, 2011
What is ambient noise? Ambient noise is all sounds that are picked up by the microphone but are not part of the conversation. Usually all sounds that are not originated from the vocal tract of the speaker are considered ambient noise. Types of ambient noise Stationary Noise – monotonic sound that has similar acoustic characteristics […]
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Echo in VoIP and Altruism

  • On November 18, 2016
What is echo in telephony? In a nutshell, echo is the phenomena in which your voice is being played back to your speakers. Echo has been with us since the early days of telephony. In the past, when most people where using PSTN lines, echo was less disturbing due to the fact that the delay […]
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How to control audio volume in conference rooms?

  • On November 20, 2016
Can you hear people that are sitting far away from the microphone? Have you ever joined a conference call where some of the participants were sitting in a conference room? Were you able to understand every word that these people were saying? Probably not. Usually you can clearly hear the people sitting close to the […]
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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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