Noise-canceling headphones have several limitations that vary from brand to brand
- They need power, usually supplied by a battery that must now and then be replaced or recharged.
- They may not cancel all sound effectively. Some noise-canceling headphones can be overloaded by low-frequency pressure waves, distorting the desired signal.[citation needed] They work well for sounds that are continuous, such as the hum of a refrigerator or the sound in an airplane cabin, but are rather ineffective against speech or other rapidly changing audio signals.
- They may introduce additional noise, usually in the form of high-frequency hiss.
- Early models were much more bulky than traditional headphones.
- They are usually heavier because of the additional batteries.
zaterdag 19 september 2009
donderdag 17 september 2009
Noise-Cancelling Headphones
These headphones hush ambient noise by creating antinoise that obviates the noise at your ear. They don't eliminate noise, but the better models
significantly reduce the whoosh of airplanes' air-conditioning systems. (They're somewhat less effective at quieting the background din on trains and
buses.) Noise-canceling headphones come in all forms, from full size to earbuds. Since you no longer have to crank up the volume to overcome background
noise, this type of headphone lets you listen at lower levels, which leads to reduced ear fatigue. You'll also hear more low-level detail in your music.
Noise-canceling headphones bring down unwanted ambient sounds (i.e., acoustic noise) by way of active noise control (ANC). Basically, this involves using a microphone, placed near the ear, and electronic circuitry which produces an "antinoise" sound wave with the opposite polarity of the sound wave arriving at the microphone. This results in interference, which cancels out the noise within the enclosed volume of the headphone.
They don't completly eliminate noise, but the better models significantly reduce the whoosh of airplanes' air-conditioning systems.
Noise-canceling headphones come in all forms, from full size to earbuds. Since you no longer have to crank up the volume to overcome background noise, this type of headphone lets you listen at lower levels, which leads to reduced ear fatigue. You'll also hear more low-level detail in your music.
significantly reduce the whoosh of airplanes' air-conditioning systems. (They're somewhat less effective at quieting the background din on trains and
buses.) Noise-canceling headphones come in all forms, from full size to earbuds. Since you no longer have to crank up the volume to overcome background
noise, this type of headphone lets you listen at lower levels, which leads to reduced ear fatigue. You'll also hear more low-level detail in your music.
Noise-canceling headphones bring down unwanted ambient sounds (i.e., acoustic noise) by way of active noise control (ANC). Basically, this involves using a microphone, placed near the ear, and electronic circuitry which produces an "antinoise" sound wave with the opposite polarity of the sound wave arriving at the microphone. This results in interference, which cancels out the noise within the enclosed volume of the headphone.
They don't completly eliminate noise, but the better models significantly reduce the whoosh of airplanes' air-conditioning systems.
Noise-canceling headphones come in all forms, from full size to earbuds. Since you no longer have to crank up the volume to overcome background noise, this type of headphone lets you listen at lower levels, which leads to reduced ear fatigue. You'll also hear more low-level detail in your music.
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