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How do noise-cancelling headphones cancel sounds?
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Noise-canceling headphones use destructive interference
When using noise-canceling headphones, the unwanted sounds are canceled out by creating an opposing sound wave to the one you want to eliminate.
It means that when one sound wave is at its highest peak, the other is at its lowest, canceling each other out.
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How noise-canceling headphones work
- The microphone on the earcup listens out for ambient noise.
- When the noise is registered, the microphone sends the frequency and amplitude of the incoming wave back to the noise-canceling circuitry.
- An out-of-phase sound is created, then fed into the headphone speakers, along with the music you're playing.
- It cancels out around 70 percent of external noise without affecting the music you're listening to.
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The invention of headphones
In 1910, Nathaniel Baldwin invented headphones. A prototype was sent to Lt. Comdr. A. J. Hepburn of the U.S. Navy. Hepburn tested the device and found it worked unexpectedly well to transmi...
The history of headphones
- Until the 1950s, people used headphones almost exclusively for radio communication.
- In 1958, John C. Koss introduced the Koss SP3 Steroephones along with a portable phonograph to patients in Milwaukee hospitals that proved revolutionary because their sound quality made them optimal for listening to music.
- 1979: The Sony "Walkman" created a need for a portable headphone and a lightweight set of MDR-3L2 headphones was included with the portable cassette player.
- In 1978, Dr. Amar Bose, while on a flight, tried an early set of electronic headphones used for passenger entertainment. But the cabin noise made it impossible to hear anything. He returned to Boston and investigated how ambient noise could be reduced with active noise cancellation.
- In 1989, the Noise Reduction Technology Group introduced the first noise-reduction headset, designed for the aviation industry.
Portable headphones
- Portable headphones became smaller and eventually lead to earbuds and in-earphones.
- In 2001 Apple introduced the iPod, and later iPhone and iPad, comes with a set of white earbuds.
- 2008. Hip hop artist and producer Dr. Dre and Interscope Chairman Jimmy Iovine launched Beats by Dr. Dre to help solidify headphones as a fashion statement.
- 2011. Sennheiser, a German headphone company, released 300 sets of the Orpheus headphones and an audio show in South Korea. A set was priced at 30,000 Euros, or roughly $41,000.
- 2012. The launch of the iPhone 5 started a new era of headphone design, the EarPod, designed to direct sound right into the ear.
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Focus on your camera
Practice looking into your camera during video conferences when you speak, even for brief moments.
It's challenging to focus on your camera for an entire meeting, but know that you increase the ...
Maintain a strong voice
Strong voices convey authority, credibility, and confidence.
Using a loud voice will also keep you from mumbling and from speaking too quickly due to the amount of breath required.
Frame yourself in the right way
Make sure you have time before the meeting to pick your location and put your head fully in frame.
In a video conference, your head and the top of your shoulders should dominate the screen. Also, be mindful of your background. Distracting elements will pull attention away from you.
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The Walkman Debut
Today when we have unlimited songs in our pocket, we take them for granted, but forty years ago in 1979, when Sony’s first portable music player the “Walkman” debuted, a personal, ...
The Walkman Effect
The Walkman goes into history as a social distancing device, isolating people who would want to stay immersed in music, blocking out the rest of the world. This was later termed as the Walkman Effect.
The headphones served as both a ‘Do Not Disturb’ sign and an instant way to get transported to a different world.
Turning The Walkman Into A Cultural Phenomenon
The 80s saw celebrities like Donna Summer, Paul Simon, Andy Warhol and many others flashing the Walkman, turning it into a status symbol.
Earphones, earlier associated with geekery or hearing problems, suddenly turned cool.