Active Noise Cancelling
Active Noise Cancelling
Active noise cancelling has been a great concept since the first patent was issued to Paul Lueg in1934. It wasn’t until the 1950’s though that it was put into any kind of practical application cancelling out noise in helicopter and airplane cockpits. It’s taken over 75 years since that first patent was issued, but now you can purchase active noise cancelling devices in several forms. The most popular among these devices are noise-cancelling headphones and the most well know of these are manufactured by Bose.
If you are looking for a little peace and quite in this noisy world, then maybe active noise cancelling is for you. Check it out below.
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How Active Noise Cancelling Works:
Active noise reduction or active noise control (ANC) works by introducing a sound wave this of the same amplitude as the offending sound, but has a phase that’s 180 degrees different. This has the effect of cancelling out the unwanted sound or reducing to a mere whisper. To make it a little simpler to understand we can relate it to a sci-fi movie with matter and anti-matter, when these two substances come together the wipe each other out. Active noise cancelling is basically the same, just no earth shattering explosion.
In the most common application out there for noise cancelling (headphones) small microphones inside the ear cups pick up the unwanted sound and transmit it to imbedded computer circuitry. The circuitry then analyzes and then reproduces a sound that is the polar opposite and then feeds it into the ear cup, thereby cancelling out the unwanted noise. This is why when wearing these headphones you can listen to music at low levels even though outside the ear cups a loud roar may be occurring. Bose originally applied their noise cancelling technology to the development of headphones for the crew of the fist around the world flight.
However there are a few drawbacks to the technology such as:
- They require a power source, typically a battery. If the battery dies during use generally so does the equipment.
- The technology works well with sounds that are continuous such as air conditioners, refrigerators or airplane cabins.
- Sometimes extremely sensitive people will experience a pressure on their ear drums from the introduced anti-sound, but you have to be extremely sensitive to discern it.
All things considered though the technology is quite effective and is only getting better, it will truly quite your world.
Noise Cancelling – Google News