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The Surprisingly Simple Truth Behind Extraordinary Results Quality Before Price!!!!  MSHILOR Focus on One Thing on TWS The The Real Active Noise Cancelling Earbuds.

 

We are specializing in the design and total solution of Audio Glasses and TWS high-tech Bluetooth earbuds/ Speakers etc, With Strengths of well-trained staff, Sufficient production capacity and fast delivery, competitive price, and reliable quality. MSHILOR Tech has Been providing unparalleled ODM/OEM Service to Clients' overseas markets. Enterprise Advantage: 7 years of experience in R&D, design, and Manufacturing of consumer electronica products, Included 3 major products Lines including TWS Earbuds, Smarts Audio Glasses.

 

Be Real, Be Yourself, MSHILOR

www.mshilor.net

 

Read more

The Surprisingly Simple Truth Behind Extraordinary Results Quality Before Price!!!!  MSHILOR Focus on One Thing on TWS The The Real Active Noise Cancelling Earbuds.

 

We are specializing in the design and total solution of Audio Glasses and TWS high-tech Bluetooth earbuds/ Speakers etc, With Strengths of well-trained staff, Sufficient production capacity and fast delivery, competitive price, and reliable quality. MSHILOR Tech has Been providing unparalleled ODM/OEM Service to Clients' overseas markets. Enterprise Advantage: 7 years of experience in R&D, design, and Manufacturing of consumer electronica products, Included 3 major products Lines including TWS Earbuds, Smarts Audio Glasses.

 

Be Real, Be Yourself, MSHILOR

www.mshilor.net

 

Read more

What's difference betwen ANC and ENC on earphones

Posted by HAOMSHILOR

here are so many headphone noise reduction functions, what is ANC, ENC, CVC, DSP noise reduction

 

The noise reduction function is very important to the function of the earphone. One is to reduce noise and avoid excessively amplifying the volume, thereby reducing damage to the ears. The second is to filter noise to improve sound quality and call quality.

Noise reduction can be divided into passive noise reduction and active noise reduction.

Passive noise reduction is physical noise reduction. Passive noise reduction refers to the use of physical characteristics to isolate external noise from the ear. The head beam of the earphone is designed to be tighter. The earmuff cavity is acoustically optimized. Acoustic materials ... etc. to achieve physical sound insulation of the headphones. Passive noise reduction is very effective for the isolation of high-frequency sounds (such as human voices), and generally reduces the noise by about 15-20dB.

 

Passive noise reduction

Active noise reduction is ANC, ENC, CVC, DSP and other noise reduction technologies that merchants will focus on when promoting the noise reduction function of headphones. What are the principles and functions of these four types of noise reduction?

ANC noise reduction

The working principle of ANC (active noise control) is that the microphone collects external environmental noise, and then the system transforms it into an inverse sound wave and adds it to the speaker. The final sound heard by the human ear is: environmental noise + anti The relative environmental noise, the superposition of two kinds of noise to achieve sensory noise reduction, the beneficiary is yourself.

Active noise reduction is divided into feed-forward active noise reduction and feedback active noise reduction according to the position of the pickup microphone.

 

(Schematic diagram of ANC noise reduction principle)

ENC noise reduction

ENC (Environmental Noise Cancellation, environmental noise reduction technology) can effectively suppress 90% of the reverse environmental noise, thereby reducing the environmental noise up to more than 35dB, allowing gamers to communicate more freely. Through the dual microphone array, the caller's speaking position is accurately calculated, while protecting the target voice in the main direction, and removing all kinds of interference noise in the environment.

 

ENC noise reduction principle

DSP noise reduction

DSP is short for English (digital signal processing). Mainly for high and low frequency noise. The working principle is that the microphone collects the external environmental noise, and then the system replicates a reverse sound wave equal to the external environmental noise to cancel the noise, thereby achieving better noise reduction effect. The principle of DSP noise reduction is similar to ANC noise reduction. However, the positive and negative noise of DSP noise reduction are directly neutralized and canceled each other within the system.

CVC noise reduction

CVC (Clear Voice Capture) is a noise reduction technology for calling software. Mainly aimed at the echo generated during the call. Through the full-duplex microphone noise reduction software, it provides the echo and environmental noise cancellation functions of the call, which is the most advanced noise reduction technology in the Bluetooth call headset.

 

The main beneficiary of DSP technology (elimination of external noise) is the headset user himself, while CVC (echo cancellation) mainly benefits the other party of the call.

Read more

here are so many headphone noise reduction functions, what is ANC, ENC, CVC, DSP noise reduction

 

The noise reduction function is very important to the function of the earphone. One is to reduce noise and avoid excessively amplifying the volume, thereby reducing damage to the ears. The second is to filter noise to improve sound quality and call quality.

Noise reduction can be divided into passive noise reduction and active noise reduction.

Passive noise reduction is physical noise reduction. Passive noise reduction refers to the use of physical characteristics to isolate external noise from the ear. The head beam of the earphone is designed to be tighter. The earmuff cavity is acoustically optimized. Acoustic materials ... etc. to achieve physical sound insulation of the headphones. Passive noise reduction is very effective for the isolation of high-frequency sounds (such as human voices), and generally reduces the noise by about 15-20dB.

 

Passive noise reduction

Active noise reduction is ANC, ENC, CVC, DSP and other noise reduction technologies that merchants will focus on when promoting the noise reduction function of headphones. What are the principles and functions of these four types of noise reduction?

ANC noise reduction

The working principle of ANC (active noise control) is that the microphone collects external environmental noise, and then the system transforms it into an inverse sound wave and adds it to the speaker. The final sound heard by the human ear is: environmental noise + anti The relative environmental noise, the superposition of two kinds of noise to achieve sensory noise reduction, the beneficiary is yourself.

Active noise reduction is divided into feed-forward active noise reduction and feedback active noise reduction according to the position of the pickup microphone.

 

(Schematic diagram of ANC noise reduction principle)

ENC noise reduction

ENC (Environmental Noise Cancellation, environmental noise reduction technology) can effectively suppress 90% of the reverse environmental noise, thereby reducing the environmental noise up to more than 35dB, allowing gamers to communicate more freely. Through the dual microphone array, the caller's speaking position is accurately calculated, while protecting the target voice in the main direction, and removing all kinds of interference noise in the environment.

 

ENC noise reduction principle

DSP noise reduction

DSP is short for English (digital signal processing). Mainly for high and low frequency noise. The working principle is that the microphone collects the external environmental noise, and then the system replicates a reverse sound wave equal to the external environmental noise to cancel the noise, thereby achieving better noise reduction effect. The principle of DSP noise reduction is similar to ANC noise reduction. However, the positive and negative noise of DSP noise reduction are directly neutralized and canceled each other within the system.

CVC noise reduction

CVC (Clear Voice Capture) is a noise reduction technology for calling software. Mainly aimed at the echo generated during the call. Through the full-duplex microphone noise reduction software, it provides the echo and environmental noise cancellation functions of the call, which is the most advanced noise reduction technology in the Bluetooth call headset.

 

The main beneficiary of DSP technology (elimination of external noise) is the headset user himself, while CVC (echo cancellation) mainly benefits the other party of the call.

Read more

Samrt Audio Glasses how they are working?

Posted by HAOMSHILOR

Smart glasses: How they work and what’s next

Close up of smart glasses technology

For centuries, the primary purpose of eyeglasses has been to improve our vision to 20/20. But now as the year 2020 arrives, eyeglass makers and internet pioneers are joining forces to make our one-trick-pony glasses smarter as well.

What in the world are smart glasses? Simply put, they are an attempt to bring the wireless connectivity and imaging we enjoy on our home computers and cellphones into the frames and lenses of our eyewear. 

Just as we can no longer imagine living without a laptop or mobile phone, soon we may enjoy the same versatility and connectivity from our eyeglasses, and even our contact lenses. Quite an eye-opener, wouldn’t you say?

Google Glass paves the way

 

 

Google was first to launch this new vision of eyewear in 2013 with the introduction of Google Glass Explorer, hoping to build on the popularity of smart watches and other wearable wireless devices. 

Unfortunately, the Explorer proved too geeky, uncomfortable and expensive ($1,500) for most, prompting Google to yank it from the market after 18 months.

How smart glasses work

 

 

Google Glass, however, proved a worthy smart glasses archetype that other tech players would soon refine. Here’s how Google Glass slipped the smarts into smart glasses:

  • Sound: The speaker for wireless audio inputs and cellphone reception rests on the end of the ear rest(s). Audio is transferred to the ear via bone conduction instead of air conduction through the audio canal.

  • Smarts: The central processing unit (CPU) computer brain is situated on the arm of one ear rest.

  • Mic: The microphone for cellphone conversations and hands-free voice searches is perched under one hinge. Most smart glasses today pair the microphone with a micro speaker for audio feedback and notifications, as well as to listen to music and podcasts. 

  • Projector and Prism: Located above the upper part of the lens, this projection method, called curved mirror or curved mirror combiner, offers partially transparent digital displays without obscuring the real-world view. Some manufacturers now offer an alternative version called waveguide holographic optics. The digital overlay of text and images within our field of view is the key that unlocks the smart glasses experience.

  • Camera: While an obvious feature in our selfie age, the camera lens at the temple of the Google Glasses brought with it an unintended new experience: privacy concerns. Many onlookers weren’t thrilled to in essence be filmed and saved without their permission, a reaction that may have hastened Explorer’s departure. While smart manufacturers now make camera lenses small enough to fit inconspicuously inside the frame of their products, a few, including Focals by North and Vue, now offer camera-less models.   

 

Powered by touch, speech or thoughts

 

 

Perhaps as entrancing as the visual overlays of smart glasses are the various ways you can control them. 

Instead of the keyboard and mouse we’re all used to, we can control smart glasses by touching, tapping or swiping controls built into the frame, verbalizing our requests as we do to Alexa and Siri, and/or directing its displays through our phone or wearable devices such as Focals by North’s hand ring. 

Other options available to smart glasses makers include gesture recognition of head, eye and hand movements such as nodding or looking up or down, directing via eye tracking and even controlling our glasses with our thoughts (really!).  

Smart glasses and better vision

 

 

Nor have developers overlooked the obvious visual role of all glasses: seeing better. 

Several models have incorporated liquid crystal technology to enable users to filter the level of brightness coming through their smart lenses, Controlling the amount of ambient light in their natural surroundings also helps users optimize the visual overlays of their smart glasses. 

Filtering brightness is a technological step forward from the photochromic or transitional lenses and could make sunglasses unnecessary. 

Increasing style, lowering price, adding AR

 

 

As for that troublesome geeky look and sky-high price tag that sank Google’s Explorer, smart glasses are making some headway with stylish models such as the Jins MEME, Meta Pro and WISEUP. The mixed result: Although their functionality is limited by their relatively sleek designs, so are their prices.

What does the future of smart glasses look like? There’s promise in the recent partnership of Facebook and Ray-Ban parent company Luxottica to launch its augmented-reality collaboration, code named Orion. 

Reportedly designed to replace smartphones, Orion will use augmented reality (AR) technology to live-stream digital images, with voice control through a Siri-like digital assistant. Orion is expected to hit the market between 2023 and 2025.

What’s more, major tech players Apple and Bose are also pursuing the potential of smart glasses as a major game-changer in the coming decade. 

While the details of Apple’s T228 project remain a mystery, it’s believed to center on combining virtual and augmented reality in a headset in the same way it did in its popular ARKit platform for iPhone developers. 

Meanwhile, Bose, a major audio brand, is working to connect sound-based AR, motion sensors and GPS data to produce three-dimensional real-time navigation and virtual street tours of attractions such as bars and restaurants.

And don’t forget Amazon, which is now offering by invitation Amazon Echo frames ($179.99) which put Alexa on your prescription eyeglasses. 

According to c/net, “The glasses look like any normal glasses, but discreetly voice Alexa's responses to your queries through tiny speakers by your ears. You can also swipe the side of the glasses to get more information, set reminders and use smart home gear while on the go.” 

A filter lets you control which notifications you want to get via the eyeglasses so you won’t be bombarded with every email, phone call or doorbell ring. 

Smart glasses: Challenges and issues

Several factors will be key to the success of smart glasses:

Education: The public will not only need to learn how to operate the new tools literally right before their eyes, but how to adapt and respond to the influx of wireless data, imaging and audio from their suddenly sentient spectacles.

Vision awareness: Eyeglasses must continue to serve their primary function, which is to correct vision. Wearers of smart glasses will need to keep their vision health in check as they adapt to the unprecedented mixed imagery ahead. 

Safety: Smart glasses have considerable potential to distract the wearer, which could increase the danger to themselves and others, especially while driving. Great Britain banned the use of Google Glass while driving even before it hit the streets.

Security: Know going in that any personal data you share through your smart glasses may not be secure. The possibility that you could be taking photos or filming others without their knowledge or consent may also prove socially awkward.

Fashion: Appearance proved a major obstacle for the geeky-looking Google Glass. Advancements in wireless technology since should allow smart glasses of the future to be fashionably slim and stylish.

With all the smart glass technology on the horizon, one thing’s for certain: Very soon, we will never look at (or through) eyeglasses the same way again.

SEE RELATED: Can VR headsets harm your eyes?

Read more

Smart glasses: How they work and what’s next

Close up of smart glasses technology

For centuries, the primary purpose of eyeglasses has been to improve our vision to 20/20. But now as the year 2020 arrives, eyeglass makers and internet pioneers are joining forces to make our one-trick-pony glasses smarter as well.

What in the world are smart glasses? Simply put, they are an attempt to bring the wireless connectivity and imaging we enjoy on our home computers and cellphones into the frames and lenses of our eyewear. 

Just as we can no longer imagine living without a laptop or mobile phone, soon we may enjoy the same versatility and connectivity from our eyeglasses, and even our contact lenses. Quite an eye-opener, wouldn’t you say?

Google Glass paves the way

 

 

Google was first to launch this new vision of eyewear in 2013 with the introduction of Google Glass Explorer, hoping to build on the popularity of smart watches and other wearable wireless devices. 

Unfortunately, the Explorer proved too geeky, uncomfortable and expensive ($1,500) for most, prompting Google to yank it from the market after 18 months.

How smart glasses work

 

 

Google Glass, however, proved a worthy smart glasses archetype that other tech players would soon refine. Here’s how Google Glass slipped the smarts into smart glasses:

  • Sound: The speaker for wireless audio inputs and cellphone reception rests on the end of the ear rest(s). Audio is transferred to the ear via bone conduction instead of air conduction through the audio canal.

  • Smarts: The central processing unit (CPU) computer brain is situated on the arm of one ear rest.

  • Mic: The microphone for cellphone conversations and hands-free voice searches is perched under one hinge. Most smart glasses today pair the microphone with a micro speaker for audio feedback and notifications, as well as to listen to music and podcasts. 

  • Projector and Prism: Located above the upper part of the lens, this projection method, called curved mirror or curved mirror combiner, offers partially transparent digital displays without obscuring the real-world view. Some manufacturers now offer an alternative version called waveguide holographic optics. The digital overlay of text and images within our field of view is the key that unlocks the smart glasses experience.

  • Camera: While an obvious feature in our selfie age, the camera lens at the temple of the Google Glasses brought with it an unintended new experience: privacy concerns. Many onlookers weren’t thrilled to in essence be filmed and saved without their permission, a reaction that may have hastened Explorer’s departure. While smart manufacturers now make camera lenses small enough to fit inconspicuously inside the frame of their products, a few, including Focals by North and Vue, now offer camera-less models.   

 

Powered by touch, speech or thoughts

 

 

Perhaps as entrancing as the visual overlays of smart glasses are the various ways you can control them. 

Instead of the keyboard and mouse we’re all used to, we can control smart glasses by touching, tapping or swiping controls built into the frame, verbalizing our requests as we do to Alexa and Siri, and/or directing its displays through our phone or wearable devices such as Focals by North’s hand ring. 

Other options available to smart glasses makers include gesture recognition of head, eye and hand movements such as nodding or looking up or down, directing via eye tracking and even controlling our glasses with our thoughts (really!).  

Smart glasses and better vision

 

 

Nor have developers overlooked the obvious visual role of all glasses: seeing better. 

Several models have incorporated liquid crystal technology to enable users to filter the level of brightness coming through their smart lenses, Controlling the amount of ambient light in their natural surroundings also helps users optimize the visual overlays of their smart glasses. 

Filtering brightness is a technological step forward from the photochromic or transitional lenses and could make sunglasses unnecessary. 

Increasing style, lowering price, adding AR

 

 

As for that troublesome geeky look and sky-high price tag that sank Google’s Explorer, smart glasses are making some headway with stylish models such as the Jins MEME, Meta Pro and WISEUP. The mixed result: Although their functionality is limited by their relatively sleek designs, so are their prices.

What does the future of smart glasses look like? There’s promise in the recent partnership of Facebook and Ray-Ban parent company Luxottica to launch its augmented-reality collaboration, code named Orion. 

Reportedly designed to replace smartphones, Orion will use augmented reality (AR) technology to live-stream digital images, with voice control through a Siri-like digital assistant. Orion is expected to hit the market between 2023 and 2025.

What’s more, major tech players Apple and Bose are also pursuing the potential of smart glasses as a major game-changer in the coming decade. 

While the details of Apple’s T228 project remain a mystery, it’s believed to center on combining virtual and augmented reality in a headset in the same way it did in its popular ARKit platform for iPhone developers. 

Meanwhile, Bose, a major audio brand, is working to connect sound-based AR, motion sensors and GPS data to produce three-dimensional real-time navigation and virtual street tours of attractions such as bars and restaurants.

And don’t forget Amazon, which is now offering by invitation Amazon Echo frames ($179.99) which put Alexa on your prescription eyeglasses. 

According to c/net, “The glasses look like any normal glasses, but discreetly voice Alexa's responses to your queries through tiny speakers by your ears. You can also swipe the side of the glasses to get more information, set reminders and use smart home gear while on the go.” 

A filter lets you control which notifications you want to get via the eyeglasses so you won’t be bombarded with every email, phone call or doorbell ring. 

Smart glasses: Challenges and issues

Several factors will be key to the success of smart glasses:

Education: The public will not only need to learn how to operate the new tools literally right before their eyes, but how to adapt and respond to the influx of wireless data, imaging and audio from their suddenly sentient spectacles.

Vision awareness: Eyeglasses must continue to serve their primary function, which is to correct vision. Wearers of smart glasses will need to keep their vision health in check as they adapt to the unprecedented mixed imagery ahead. 

Safety: Smart glasses have considerable potential to distract the wearer, which could increase the danger to themselves and others, especially while driving. Great Britain banned the use of Google Glass while driving even before it hit the streets.

Security: Know going in that any personal data you share through your smart glasses may not be secure. The possibility that you could be taking photos or filming others without their knowledge or consent may also prove socially awkward.

Fashion: Appearance proved a major obstacle for the geeky-looking Google Glass. Advancements in wireless technology since should allow smart glasses of the future to be fashionably slim and stylish.

With all the smart glass technology on the horizon, one thing’s for certain: Very soon, we will never look at (or through) eyeglasses the same way again.

SEE RELATED: Can VR headsets harm your eyes?

Read more

How do noise-cancelling headphones work?

Posted by HAOMSHILOR

If you’re a commuter or listen to your music in public, there is no better upgrade you can get than noise cancelling headphones. Many people believe that in order to get better sound quality, they need to spend more, but that’s only half right: you need to also prevent noise that could overpower your music from reaching your ears. Plenty of companies have tried their hand at active noise cancelling (ANC) headphones, and a few have become so good at it that it’s one of the main selling points for their wireless headsets. But how do noise-cancelling headphones work? And why is it so cool?

 

Editor’s note: this article was updated on August 27, 2020, to include information about noise cancelling technology and dizziness. 

 

Know thy enemy: noise

 

how do noise-cancelling headphones workBBC

 

To understand how to cancel noise, it’s important to first what sound is. If you try to visualize sound, you probably picture it in the form of a wave like the one pictured above. Though this 2D illustration will definitely come in handy later, it isn’t entirely an accurate depiction of what sound actually is. At least not until you fully understand what it implies. This is where physics kicks in.

 

Sound as you hear it is really just the compression and decompression of the particles in the medium in it flows through—for our purposes, we’re talking about air. It may be a little easier to picture sound as a 3D ripple through air. Those moving particles lead to very slight changes in air pressure. We call the measured power of these changes in air pressure amplitude. Your ears and brain detect and decipher those changes in pressure as sound. If you were to chart the amplitude, over time you end up with the wave pictured above. The louder the sound, the more extreme the amplitude.

 

How your headphones cancel outside noise

 

Your headphones cancel outside noise by using a trick of physics called “anti-phase.” The concept is simple, but very difficult to get right, as you’ll read ahead.

 

If you were to take two identical waves and place them on top of each other matching up the peaks and troughs, the two waves are said to be “in-phase” which results in an even larger wave (louder sound). But what happens if you delay one of the waves by exactly one half wavelength matching up the the troughs with the peaks of the other like in the picture below?

 

Constructive and Destructive Interference

 

The two waves are then said to be “out of phase” and subtract from one another as the positive pressures of one wave are acting against the negative pressures of the other, and vice versa. Think of it as trying to add one and subtract one. You’re just left with zero. This is the basic physics behind active noise canceling. But how is that used in your headphones?

 

Tiny microphones

 

A photo showing the microphone array of the Bose Noise Canceling Headphones 700.

The microphone array (shown here as the holes in the side) records the noise around you to calculate how to cancel it

 

Headphones make use of this by way of tiny microphones on the outside of your headphones. They listen to the ambient noise around you, and then the onboard electronics take it from there. The headphones then create sound that is exactly opposite to that sound wave (the anti-phase) to cancel it out so that all you should hear is the music coming from your headphones—and not anything going on outside.

 

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 recognize and cancel when compared to sudden, random sounds like people talking.

 

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 pick the pair that’s right for you.

 

Can noise cancelling headphones cause dizziness?

 

A picture of the Panasonic RZ-S500W noise cancelling earbuds both in the case, showing the LEDs on the buds.

The Panasonic RZ-S500W made Lily feel disoriented, because of the high-intensity hybrid ANC technology.

 

Yes, listeners have reported feelings of dizziness and disorientation when using noise cancelling headphones—our very own Lily Katz included. In some cases, headaches and nausea are also present.

 

According to an interview with the Wall Street Journal, New York ear, nose, and throat doctor Sarah Stackpole explained that noise cancelling technology may transmit extremely low-frequency vibrations that stimulate balance receptors connected to our ears’ stereocilia, or hearing hair cells. What then happens is that these receptors falsely communicate to the brain that the head is moving, despite one’s eyes being fixed. Mixed messages like this can trick the brain into thinking its experiencing motion and thus, dizziness.

 

One solution to this for moderately affected listeners is to decrease the ANC intensity. This can be done in many headset apps, or it can be changed directly with the headset’s controls. Another solution is to buy a pair of noise cancelling headphones that aren’t at the top of the class. The sub-optimal noise cancelling may be frustrating or disappointing to others who don’t suffer from side effects, but could prove just right for you. The final solution is to forgo active noise cancelling altogether, which isn’t the best option for frequent flyers but may be the most comfortable.

 

Next: Sony WH-1000XM4 vs Sony WH-1000XM3

 

Frequently Asked Questions

Can you use the noise cancelling headphones to give you silence or do you have to play music?

Was ditching the headphone jack a good idea?

Read more

If you’re a commuter or listen to your music in public, there is no better upgrade you can get than noise cancelling headphones. Many people believe that in order to get better sound quality, they need to spend more, but that’s only half right: you need to also prevent noise that could overpower your music from reaching your ears. Plenty of companies have tried their hand at active noise cancelling (ANC) headphones, and a few have become so good at it that it’s one of the main selling points for their wireless headsets. But how do noise-cancelling headphones work? And why is it so cool?

 

Editor’s note: this article was updated on August 27, 2020, to include information about noise cancelling technology and dizziness. 

 

Know thy enemy: noise

 

how do noise-cancelling headphones workBBC

 

To understand how to cancel noise, it’s important to first what sound is. If you try to visualize sound, you probably picture it in the form of a wave like the one pictured above. Though this 2D illustration will definitely come in handy later, it isn’t entirely an accurate depiction of what sound actually is. At least not until you fully understand what it implies. This is where physics kicks in.

 

Sound as you hear it is really just the compression and decompression of the particles in the medium in it flows through—for our purposes, we’re talking about air. It may be a little easier to picture sound as a 3D ripple through air. Those moving particles lead to very slight changes in air pressure. We call the measured power of these changes in air pressure amplitude. Your ears and brain detect and decipher those changes in pressure as sound. If you were to chart the amplitude, over time you end up with the wave pictured above. The louder the sound, the more extreme the amplitude.

 

How your headphones cancel outside noise

 

Your headphones cancel outside noise by using a trick of physics called “anti-phase.” The concept is simple, but very difficult to get right, as you’ll read ahead.

 

If you were to take two identical waves and place them on top of each other matching up the peaks and troughs, the two waves are said to be “in-phase” which results in an even larger wave (louder sound). But what happens if you delay one of the waves by exactly one half wavelength matching up the the troughs with the peaks of the other like in the picture below?

 

Constructive and Destructive Interference

 

The two waves are then said to be “out of phase” and subtract from one another as the positive pressures of one wave are acting against the negative pressures of the other, and vice versa. Think of it as trying to add one and subtract one. You’re just left with zero. This is the basic physics behind active noise canceling. But how is that used in your headphones?

 

Tiny microphones

 

A photo showing the microphone array of the Bose Noise Canceling Headphones 700.

The microphone array (shown here as the holes in the side) records the noise around you to calculate how to cancel it

 

Headphones make use of this by way of tiny microphones on the outside of your headphones. They listen to the ambient noise around you, and then the onboard electronics take it from there. The headphones then create sound that is exactly opposite to that sound wave (the anti-phase) to cancel it out so that all you should hear is the music coming from your headphones—and not anything going on outside.

 

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 recognize and cancel when compared to sudden, random sounds like people talking.

 

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 pick the pair that’s right for you.

 

Can noise cancelling headphones cause dizziness?

 

A picture of the Panasonic RZ-S500W noise cancelling earbuds both in the case, showing the LEDs on the buds.

The Panasonic RZ-S500W made Lily feel disoriented, because of the high-intensity hybrid ANC technology.

 

Yes, listeners have reported feelings of dizziness and disorientation when using noise cancelling headphones—our very own Lily Katz included. In some cases, headaches and nausea are also present.

 

According to an interview with the Wall Street Journal, New York ear, nose, and throat doctor Sarah Stackpole explained that noise cancelling technology may transmit extremely low-frequency vibrations that stimulate balance receptors connected to our ears’ stereocilia, or hearing hair cells. What then happens is that these receptors falsely communicate to the brain that the head is moving, despite one’s eyes being fixed. Mixed messages like this can trick the brain into thinking its experiencing motion and thus, dizziness.

 

One solution to this for moderately affected listeners is to decrease the ANC intensity. This can be done in many headset apps, or it can be changed directly with the headset’s controls. Another solution is to buy a pair of noise cancelling headphones that aren’t at the top of the class. The sub-optimal noise cancelling may be frustrating or disappointing to others who don’t suffer from side effects, but could prove just right for you. The final solution is to forgo active noise cancelling altogether, which isn’t the best option for frequent flyers but may be the most comfortable.

 

Next: Sony WH-1000XM4 vs Sony WH-1000XM3

 

Frequently Asked Questions

Can you use the noise cancelling headphones to give you silence or do you have to play music?

Was ditching the headphone jack a good idea?

Read more