Echo Cancellation; What Is Echo Cancellation; Headsets Are Usually Not A Problem; Voip Conversation Using Two Headsets - Vlsi VS1000+1003 User Manual

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Echo Cancellation

6
6.1

What Is Echo Cancellation

Echo cancellation is a method to reduce energy returning from a speaker to a microphone.
The reason for using echo cancellation is presented below.
6.1.1

Headsets Are Usually Not a Problem

Near−End
Speaker
VoIP protocols like Skype are typically designed to work with headsets that have good
separation between the earphones and the microphone.
Figure 6.1 shows two telephone application users who are both using headsets. Because
there is no significant leakage between from the earphones to the microphones, there is
no disturbing echo.
Rev. 2.20
VS1000+1003 VoIP Speaker Phone
PC
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Figure 6.1: VoIP Conversation using Two Headsets
2009-12-07
6. ECHO CANCELLATION
PC
Internet
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VSMPG
Far−End
Speaker
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