moderated Re: question about audio feedback loop when using Zoom

Richard Turner

I found the below on a Zoom blog.

The link is at the end.


audio feedback

Despite Zoom’s uncanny ability to provide you with an excellent video meeting every single time you use it, with any technology, there’s bound to be some problem every once in awhile.  For example you’re in a meeting, enjoying your chat, and suddenly you hear a noise that almost shreds your eardrums. What was that?!


This phenomenon is known as acoustic feedback and it occurs when sound that comes from a pair of speakers creates a loop that circulates back and forth between the speakers and your microphone. This usually happens in situations where someone is speaking publicly since the sound going into the microphone is also played back through a pair of speakers. Since you don’t experience the same playback situation in a Zoom meeting, this should be a rare occurrence. But with 10 million users, we’ve pretty much seen it all.


If you’re experiencing acoustic feedback on Zoom, you must first find out the reason why the blaring noise is giving your ears a hard time before you solve the issue.


Are You Playing Back Your Own Audio?

Your computer lets you have the option of playing back your own microphone’s audio through its speakers. If you have this setting enabled, you will be able to hear your own voice through your speakers even though you are not running any active applications. Try blowing into your microphone with your volume set high. If you hear some garbled audio coming from your speakers, you have microphone playback enabled.


On Mac OS X, this is not a default option that comes with the operating system. However, if you’re using Windows, you will have to shut this option down to prevent feedback.


On Windows 7 and 8, right-click the speaker icon on the taskbar at the bottom right-hand side of your screen and then click “Sounds.” Select the “Recording” tab and pick your active microphone. Once you’ve selected it, click the “Properties” button found below your list of recording devices. Click the “Listen” tab and then deselect the option labeled “Listen to this device.” Once you’ve configured everything, your Zoom meeting should run smoothly.


If you want to keep the playback, pay special attention to where your microphone is situated. Keep your microphone as far away from your speakers as possible and make sure it is pointing in the opposite direction. You will also have to keep your playback volume low for microphone playback to work without any acoustic feedback.


Are Other Computers In The Same Room Joining Your Meeting?

zoom - multiple devices

Two computers join a Zoom meeting from the same room. Why? Maybe one of them wanted to join from their laptop or mobile device to screen share a document, or maybe they just wanted stay at their desk to multitask during the meeting instead of joining their colleagues on the big screen. Regardless of the reason, both of them have their speakers on full blast and microphones situated close to those speakers. Almost instantly, your room will sound like a very badly set-up stage for a rock concert.


To correct this issue, either have the second device leave the meeting or mute its microphone and speaker. If this is a conference room where you’ll be expecting company, the best setup is to have one or two monitors positioned at the end of a table with a powerful set of speakers and microphone.


Someone’s Speaker Volume is Extremely High

In some video meetings, you’ll encounter a participant whose speaker volume is so obnoxiously high that you can hear yourself through his equipment. This could be the one thing causing a feedback loop. You see, your voice passes through your microphone into the Zoom meeting, then goes out the other end through the oblivious participant’s speakers, back into their microphone, and back out your speakers. If the sound is loud enough, it will bounce back into your microphone, starting the process all over again. As it loops, the sound gets distorted and you get a very nasty echo.


In this situation, try muting the participant whose equipment you think is causing problems for a few seconds. If the issue is resolved, inform the participant of the situation and ask them to lower their speaker volume. While you’re at it, make it a policy for meeting participants to keep their speaker volumes at a decent level or wear headphones. This eliminates the possibility of unwanted sounds having a dance party on everyone’s ear drums.




"There's a nap for that." - an anonymous cat in a window in Portland, Oregon.



From: <> On Behalf Of Amy Bower
Sent: Saturday, April 18, 2020 12:02 PM
Cc: Amy S Bower <abower@...>
Subject: question about audio feedback loop when using Zoom


Hi All:

I’ve become a frequent Zoom user in this new universe of working from home. I’m working on a Lenovo P53 laptop running Windows 10 and Jaws 2020. My problem is that in almost every meeting, my mic and speakers get suddenly muted, and a dialogue box pops up entitled “feedback loop detected”. There are yes and no buttons in the dialogue box to choose whether to continue muting or not. #1 issue is that when everything mutes, so does Jaws, so I don’t even know that the dialogue box has appeared, and can’t use Jaws to navigate to the buttons on it. I’ve figured out a work-around for that, from a tech at FS – I press jaws key + escape, which unmutes Jaws. Then I can navigate to the no button on the dialogue box.

But the bigger problem to solve (#2 problem) is getting this dialogue box not to appear at all, and not to have the mic and speakers automatically muted during a Zoom meeting. I’ve looked everywhere on Google search, and can’t find hardly any reference to this issue at all. After browsing through Jonathan Mosen’s book on Zoom (which is free at the moment, BTW), and not finding anything about this, I emailed Jonathan to ask him directly. His suggestion is to use a USB headset bc it essentially has it’s own sound card built in. There may be an issue with Jaws and the mic/speakers using the same sound card, that hopefully will be overcome with the USB headset. I had been using either the built-in mic and speakers, or a Bos Sport set of headphones with a mic in the cord, that plugs into the laptop’s audio jack. The unwanted muting problem occurs with both set ups. My home office usually has a USB headset kicking around, but alas, when I went to look for one, I found none – I must have taken them to my office. Getting a new one these days is like getting toilet paper, but I do have one on order from Amazon, due to arrive Wednesday. I’m hoping that will solve this very annoying problem. In the meantime, I thought I would describe this problem to the list and see if anyone else had this problem and new how to solve it another way.

Be well.

-Amy B.

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