{"id":8318,"date":"2021-06-25T21:53:23","date_gmt":"2021-06-25T17:53:23","guid":{"rendered":"https:\/\/krisp.ai\/blog\/?p=8318"},"modified":"2025-03-12T18:30:38","modified_gmt":"2025-03-12T14:30:38","slug":"acoustic-echo-cancellation","status":"publish","type":"post","link":"https:\/\/krisp.ai\/blog\/acoustic-echo-cancellation\/","title":{"rendered":"What is Acoustic Echo Cancellation?"},"content":{"rendered":"

We\u2019ve all been on a conference call where someone\u2019s voice echoed during the meeting. Sometimes, it\u2019s simply distracting and annoying, but other times the echo can be so bad that it\u2019s impossible to understand the speaker.\u00a0<\/span><\/p>\n

How many times have you had to interrupt a call to say, \u201cSorry, there\u2019s a bit of an echo on your end!\u201d<\/span><\/p>\n

Speaker phones, conferencing devices, and laptops are offering better quality sound than ever, but they can still run into problems with echo on audio and video calls.\u00a0<\/span><\/p>\n

That\u2019s why Acoustic Echo Cancellation is so important. It\u2019s a way of solving the issue and ensuring every call you have is clear and echo-free. Let\u2019s take a look at this feature and why it\u2019s a necessary part of any conference technology.\u00a0<\/span><\/p>\n

What is Acoustic Echo?<\/span><\/h2>\n

First of all, let\u2019s talk about what Acoustic Echo is and why it happens. This issue mostly occurs due to how sound is captured by the technology you are using to have the call.\u00a0\u00a0<\/span><\/p>\n

When you are on a call on speakerphone, the speech of the person you are talking to gets played out from the loudspeaker. This is referred to as \u201cfar-end speech.\u201d Also, your own voice is captured by the microphone and sent across the network to the other end of the call. This is referred to as \u201cnear-end speech.\u201d\u00a0<\/span><\/p>\n

\"acoustic<\/p>\n

However, the microphones don\u2019t just capture the near-end speech, they can also capture the far-end speech. If the far-end speech is transmitted to the other side of the call, the other person will hear their own voice, after a slight delay for network and processing.\u00a0<\/span><\/p>\n

This problem often occurs when the caller is on speakerphone, and it\u2019s possible to resolve the issue by using headphones. However, that\u2019s not always the case. Acoustic Echo also can be an issue not only on speakerphones but also on mobiles and other handsets, due to the mechanical coupling of the earpiece speakers and microphones.\u00a0<\/span><\/p>\n

This is the \u201cecho\u201d we are concerned with, and the length of the delay determines how annoying it will be. So, how long does an echo need to last until it becomes significantly disruptive to the phone call?\u00a0<\/span><\/p>\n

Acoustic Echo vs Room Echo<\/span><\/h2>\n

When most people hear the word, \u201cecho,\u201d they immediately think of shouting into an empty room to hear their voice repeating back to them over and over again. And while this kind of echo, called room echo, is more familiar to us, it\u2019s actually different than what you experience on a call or online meeting, which is acoustic echo.<\/span><\/p>\n

How Much Echo is Too Much?<\/span><\/p>\n

You might think that you\u2019d be able to ignore a small echo, but it really does have quite an impact on your ability to listen to a call. Even a little bit of echo can be too much for most people to handle.\u00a0<\/span><\/p>\n

How significant of a delay does there have to be for it to annoy the listener?<\/span><\/p>\n

An echo with a delay of less than 40ms will most likely not annoy the listener. In fact, this type of delay is usually barely noticed. However, an echo of more than 40ms is enough to be perceived by the human ear.\u00a0<\/span><\/p>\n

An echo of this length can make speech very difficult to understand. Over a full phone call, it can become incredibly annoying for all participants. Plus, it can result in callers not understanding each other and important information being missed.\u00a0<\/span><\/p>\n

How Does Acoustic Echo Cancellation Work?<\/span><\/h2>\n

What do we need to do to cancel out the Acoustic Echo? Let\u2019s take a closer look at how we combat this echo with Acoustic Echo Cancellation.\u00a0\u00a0<\/span><\/p>\n

In order to stop this from happening, you\u2019ll need a mechanism that blocks the transmission of far-end speech back to the other party in the call. It should block any echoes, reverberations, and unwanted added sounds from the signal passing through the acoustic space.\u00a0<\/span><\/p>\n

Acoustic Echo Cancellation works by creating a filter that can do exactly that. It\u2019s based on an adaptive algorithm, which adapts this filter to model the acoustic path. The output of the filter is then removed from the acoustic path signal in order to create a \u201cclean\u201d signal output. Any echoes in the call environment are removed.\u00a0<\/span><\/p>\n

For example, let\u2019s say you\u2019re having a call with someone, and you are on speakerphone. The filter will block out any echoes and reverberations in your space, so the person you are calling will only hear your voice.\u00a0<\/span><\/p>\n

\"\"<\/p>\n

The filter can also detect any unrelated sounds in the acoustic path. For example, if music is playing in the near-end space, it can be picked up by the far-end signal. The adaptive filter will cancel the sound of the music. This allows for a clear conversation\u2013even if there is music in the background.\u00a0<\/span><\/p>\n

For instance, if you\u2019re on a hands-free call in your car while music is playing, you won\u2019t have to pause the music during the conversation. Both the music AND the voice of the other speaker will be eliminated from the signal that is being picked up by the microphone. At that point, only the local speaker\u2019s voice is sent out on the far end.\u00a0<\/span><\/p>\n

Krisp\u2019s Acoustic and Room<\/span> Echo Cancellation: Essential for Clear Communication\u00a0<\/span><\/h2>\n

If you\u2019re trying to have an important phone call, whether it\u2019s for work or to catch up with a loved one, you don\u2019t want to be distracted by annoying echoes. That\u2019s why it\u2019s so important to avoid this echo with some sort of Acoustic Echo Cancellation.\u00a0<\/span><\/p>\n

All video and audio conference technology needs to address this issue, or it is going to cause issues regularly on phone calls.\u00a0<\/span><\/p>\n

In addition to making your calls clearer and easier to understand, having acoustic echo cancellation will save you a lot of money. You will be able to have excellent sound quality in any conference room, without having to invest in sound-absorbing construction and materials.\u00a0<\/span><\/p>\n

The good news is that <\/span>Krisp<\/span><\/a> supports A<\/span>coustic Echo Cancellation<\/span><\/a>! It works by not letting the echo captured by your actual microphone reach the other participants on your call. That means that you\u2019ll be able to communicate online with total ease.\u00a0<\/span><\/p>\n

Krisp<\/span><\/a> removes room echo in real time during your call by having Room Echo Cancellation built right into our bi-directional Noise Cancellation. That means you can take a call in any room, even an echoey one, and you\u2019ll still sound great. You\u2019ll be able to take a call with multiple participants, all in different environments, with each one coming through loud and clear.\u00a0<\/span><\/p>\n

[demo-new]<\/p>\n

Still have questions about how Krisp\u2019s Acoustic Echo Cancellation works<\/span>? Feel free to contact us at any time in the comments section<\/span> below or by contacting us at support@krisp.a<\/span>i!\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

We\u2019ve all been on a conference call where someone\u2019s voice echoed during the meeting. Sometimes, it\u2019s simply distracting and annoying, but other times the echo can be so bad that it\u2019s impossible to understand the speaker.\u00a0 How many times have you had to interrupt a call to say, \u201cSorry, there\u2019s a bit of an echo […]<\/p>\n","protected":false},"author":29,"featured_media":9333,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"two_page_speed":[]},"categories":[414,418],"tags":[],"acf":[],"yoast_head":"\nWhat is Acoustic Echo Cancellation? - Krisp<\/title>\n<meta name=\"description\" content=\"What is acoustic echo cancellation and how does it work? 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