Audio Feedback vs. Echo – What’s the Difference?
There it is again, that unbelievably annoying high pitched sound. What is it? One person says it’s an echo, another person says it’s a reverberation and yet someone else is saying it’s feedback. All I know is it’s driving me absolutely crazy and somebody just needs to make it stop!
If you video conference on a regular basis, chances are you’ve been in a similar situation. People are throwing around different terms left and right then arguing over whose side is at fault. With all of this going on it can be difficult to determine exactly what the problem is let alone how to fix it.
Here’s a quick overview to help distinguish between echo, reverberation and feedback along with some tips to help reduce each one.
Echo, also known as reverberation, is almost always a problem on the far end of a video conference and is the result of a reflection of sound. When a participant speaks into a microphone, the audio gets transmitted to the other side through their speakers. Then, their microphone picks up the audio and sends it back to the speakers in the local room. Participants in the local room hear what was just said again since the speakers on the far end are not cancelling out the audio properly.
To minimize reverberations, an echo canceller or acoustical ceiling tiles can be installed. Additionally, minor adjustments to the type and placement of room furniture along with the installation of shades or a heavy rug can help improve acoustics in the room.
Audio feedback, on the other hand, is almost always an issue with the local room. It occurs when a sound loop exists between an audio input (microphone) and an audio output (speaker). Essentially, when a participant speaks the audio passes through a microphone to the speakers and gets amplified. The process continues to repeat as the microphone picks up the noise, amplifies it further, and passes it through the speaker. Eventually a sound, ranging from a low pitch to an extremely high pitch, is emitted which can disrupt the conference in addition to be extremely annoying.
To minimize feedback, microphones and speakers should be spaced appropriately and positioned so the speaker output isn’t feeding directly into the microphone. Additionally a digital feedback eliminator or noise filter can be installed to reduce feedback.
Audio quality plays a significant role in the video conferencing experience and should not be taken lightly. Poor audio can detract from the effectiveness of the meeting as participants are focused more on trying to hear speakers and tune out background noises than on the topics being discussed.