


{"id":1824,"date":"2019-04-18T18:34:03","date_gmt":"2019-04-18T14:34:03","guid":{"rendered":"https:\/\/krisp.ai\/blog\/?p=1824"},"modified":"2021-09-10T00:08:09","modified_gmt":"2021-09-09T20:08:09","slug":"how-noise-cancelling-headphones-work","status":"publish","type":"post","link":"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/","title":{"rendered":"How Do Noise Cancelling Headphones Work?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">In your search for a new pair of headphones, you may have come across some that offer active noise cancelling (ANC). Noise-cancelling headphones, are headphones that reduce unwanted ambient sounds using active noise control. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing (usually only by having a super snug fit in your ear canals). Blocking outside noise makes listening to music, and making calls in noisy environments much more convenient.<\/span><\/p>\n<h2><strong>Who invented noise cancelling headphones?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Dr. Lawrence Jerome Fogel was considered to be the inventor of active noise cancellation, and he designed one of the first noise cancelling headphones systems, and submitted patents about <a href=\"https:\/\/krisp.ai\/blog\/noise-cancelling-headphones-future\/\">active noise cancellation<\/a> specifically in the field of aviation.<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-1832\" src=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/art-background-blue-1037996.jpg\" alt=\"noise cancelling headphones\" width=\"5874\" height=\"3921\" \/><\/p>\n<p><span style=\"font-weight: 400;\">This system was designed to reduce noise for the pilots in the cockpit area and help make their communication easier and protect hearing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But how does it all work? The simple answer is that it\u2019s all to do with physics\u2026<\/span><\/p>\n<h2><strong>Perception of Sound<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">To fully understand how ANC works, you need to understand the sound, its different aspects, and how we perceive it. If we try to visualise sound, we would usually picture it in the form of a wave like the one pictured below.<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-1829\" src=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/65465.png\" alt=\"sound wave for noise cancelling headphones\" width=\"482\" height=\"265\" srcset=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/65465.png 482w, https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/65465-300x165.png 300w\" sizes=\"(max-width: 482px) 100vw, 482px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Although the illustration is handy in helping us to visualise things, it isn\u2019t entirely an accurate depiction of what sound actually is. Here\u2019s where we need to look at the physics of it all. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Sound as we hear it is just the compression and decompression of the particles located within the medium in which the waves flow through. Picture sound as a 3D ripple through the air particles around us. The vibration of the particles leads to very slight changes in air pressure. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">We call these changes in air pressure amplitude. Your ears are capable of detecting and deciphering those changes in pressure as sound. If you draw a graph measuring the changes in pressure, or amplitude, over time you end up with the wave we have pictured above. The louder the sound, the higher the amplitude.<\/span><\/p>\n<h2><b>In-Phase vs Out-of-Phase Waves<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Now that we know how to get a sine wave, let\u2019s break active noise cancelling down and get into how headphones are able to cancel outside noise. To get a little more technical again, the answer lies in something called phase and anti-phase. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">What does that mean? The highest point of the wave is called the peak, and the lowest point is the trough. As any surfer would be aware, these are just characteristics of a wave. <\/span><\/p>\n<h2><b>Constructive and Destructive Interference<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If you take two waves and place them on top of each other, matching up the peaks and troughs, the two waves are said to be \u201cin-phase\u201d which results in an even larger wave.<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-1830\" src=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/987.png\" alt=\"out phase soundwaves for noise cancellation\" width=\"398\" height=\"221\" srcset=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/987.png 398w, https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/987-300x167.png 300w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">But what happens if you move one of the waves over, slightly matching up the the trough of one with the peak of the other like in the picture above? In this case, the wave becomes effectively cancelled.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The two waves are now said to be \u201cout of phase\u201d and dissipate to zero. Think of it as trying to add one and subtract one. You\u2019re just left with zero. This is the physics behind <a href=\"https:\/\/krisp.ai\/blog\/noise-or-silence\/\">active noise cancelling<\/a>, and now that we understand that, let&#8217;s move onto how this phenomenon is used in your headphones.<\/span><\/p>\n<h2><b>Tiny Microphones<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In order for active noise cancelling to work, your noise-cancelling headphones use tiny microphones on the outside of your <a href=\"https:\/\/krisp.ai\/blog\/headphones-cheat-sheet\/\">headphones<\/a>. They listen to the ambient noise around you, which they processed as a sound wave.<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-1831\" src=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/notebook-338486_1920.jpg\" alt=\"noise cancelling headphones work\" width=\"1920\" height=\"1271\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The headphones then create the sound which is exactly opposite to that sound wave (the anti-phase) and cancel it out, so that all you hear is the music coming from your headphones and not anything going on outside.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Of course this is all theoretical. In practice, noise cancellation is hard to do and far from perfect. Consistent noises like the low hums of jet engines on airplanes are easier for headphones to recognise and cancel when compared to sudden, random sounds like people talking or babies wailing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While the physics remains the same, some companies are better at active noise cancelling than others. But now that you know how it works, you can use this new knowledge to impress your friends, and also to unravel the sales jargon you might come across the next time you need to pick<\/span><span style=\"font-weight: 400;\">\u00a0the best pair of <\/span><a href=\"https:\/\/krisp.ai\/blog\/akgn60nc-audiotechnica-ath-plantronics-backbeatpro\/\"><span style=\"font-weight: 400;\">noise cancelling headphones that are right for you<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>BONUS TIP:<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Noise can have a drastic impact on productivity and concentration, as we covered earlier in this post. Take your noise cancellation game a step forward and take an advantage of <a href=\"https:\/\/krisp.ai\/blog\/noise-cancelling-apps-mac\/\" target=\"_blank\" rel=\"noopener noreferrer\">noise cancelling apps for Mac<\/a>\u00a0or\u00a0<a href=\"https:\/\/krisp.ai\/blog\/noise-cancelling-apps-windows\/\" target=\"_blank\" rel=\"noopener noreferrer\">noise cancelling apps for Windows<\/a>\u00a0if you&#8217;re PC user.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you regularly use (or plan on using) noise-cancelling headphones when making calls over the Internet, then you should definitely check out<\/span><a href=\"https:\/\/krisp.ai\/\"> <span style=\"font-weight: 400;\">Krisp.<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">This nifty noise cancelling app filters out pesky background noise at both ends, leading to a significant boost in the quality of your calls. Try it for yourself, and let us know how you get on in the comments!<\/span><\/p>\n<p>[demo]<\/p>\n<p><em><span style=\"font-weight: 400;\">Do you have anything to add to our quick physics lesson? Which were the first pair of noise-cancelling headphones that you bought? Do you have any recommendations? Let us know in the comments below\u2026<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In your search for a new pair of headphones, you may have come across some that offer active noise cancelling (ANC). Noise-cancelling headphones, are headphones that reduce unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing (usually only [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":4617,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"two_page_speed":[]},"categories":[73,414],"tags":[154,104,48,153],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Do Noise Cancelling Headphones Work? - Krisp<\/title>\n<meta name=\"description\" content=\"How noise cancelling headphones work is no mystery. We cover everything you need to know about the science behind noise cancelling headphones!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Do Noise Cancelling Headphones Work? - Krisp\" \/>\n<meta property=\"og:description\" content=\"How noise cancelling headphones work is no mystery. We cover everything you need to know about the science behind noise cancelling headphones!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\" \/>\n<meta property=\"og:site_name\" content=\"Krisp\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/krispHQ\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-04-18T14:34:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-09-09T20:08:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/How-do-Noise-Cancelling-Headphones-Work-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"610\" \/>\n\t<meta property=\"og:image:height\" content=\"440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Christian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@krispHQ\" \/>\n<meta name=\"twitter:site\" content=\"@krispHQ\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\"},\"author\":{\"name\":\"Christian\",\"@id\":\"https:\/\/krisp.ai\/blog\/#\/schema\/person\/9c3da7ed710730f1afd3d84357572082\"},\"headline\":\"How Do Noise Cancelling Headphones Work?\",\"datePublished\":\"2019-04-18T14:34:03+00:00\",\"dateModified\":\"2021-09-09T20:08:09+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\"},\"wordCount\":903,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/krisp.ai\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/How-do-Noise-Cancelling-Headphones-Work-1.jpg\",\"keywords\":[\"active noise cancellation\",\"ANC\",\"noise cancellation\",\"passive noise cancellation\"],\"articleSection\":[\"Headphones and Devices\",\"Noise Cancellation\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\",\"url\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/\",\"name\":\"How Do Noise Cancelling Headphones Work? - Krisp\",\"isPartOf\":{\"@id\":\"https:\/\/krisp.ai\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/krisp.ai\/blog\/how-noise-cancelling-headphones-work\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/krisp.ai\/blog\/wp-content\/uploads\/2019\/04\/How-do-Noise-Cancelling-Headphones-Work-1.jpg\",\"datePublished\":\"2019-04-18T14:34:03+00:00\",\"dateModified\":\"2021-09-09T20:08:09+00:00\",\"description\":\"How noise cancelling headphones work is no mystery. 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