Echo is the repetition of sound caused by reflection of sound waves from any surface. During a conversation, echo can occur due to reflection of sound from the speakers. Other reasons include use of low-quality audio devices or the proximity of a microphone to the speakers. Your friend might complain that he is unable to hear you properly in an audio call because of the echo. If you are not certain about the specific cause of the echo, there are a number of things you can do to resolve the issue.
Turn off the "Microphone Boost" feature on your PC, if it is turned on. Click the "Start" menu and open the "Control Panel." Click "Hardware and Sound" and then select "Sound." Click the "Recording" tab in the "Sound" dialog box. Select your microphone device and then select "Properties." Open the "Levels" tab and uncheck the option "Microphone Boost," if it is checked.
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Reduce the volume of the external speakers. If you are using the headset microphone with external speakers, the echo can be significantly reduced by lowering the volume of the external speakers.
Place the microphone away from the external speakers. By increasing the distance between the speakers and the microphone, the echo will be reduced.
Replace the external speakers with the built-in speakers of the headset. Unplug the audio cable of the external speakers and connect the green audio plug of the headset to the audio jack of your PC.
Change the direction of the microphone. If the microphone is placed next to an object such as a wall that is capable of reflecting sound waves, readjust the position of the microphone so your voice does not reflect from the wall to produce the echo.
Replace your headset if all else fails to work. If you can still hear the echo, it's likely that your audio device is damaged. Get a new headset from any computer supply store and use it for a smooth communication experience.