If noise cancellation technology uses a microphone to detect sound, then digitally processes the sound sample and outputs an 'opposite' sound to balance the two out which simulates silence, wouldn't it seem feasible to obtain a digital recording of what the device sends out to the headset?
Example for use (MY GOAL!): Burn a noise cancelling audio CD to make my Toyota Avalon a bit less noisy on the freeway. I have searched high and low online for answers, but have not found any sort of "universal noise cancelling audio track." Any/all info would be great- thanks a trillion! :-)
2006-10-30 13:29:22 · 3 answers · asked by Anonymous in Consumer Electronics ➔ Other - Electronics
Correct me if I'm wrong, but don't some of the cheaper "noise cancelling" headphones just have a more/less universal sound they output? I bought a set of Sony headphones a while back and I swear it made the same sound all the time which only helped in certain situations, and would help in my car as well. I looked it up and down for a microphone but for the price I paid I don't think it had one. This was over a year ago, possibly the first set of Sony noise cancelling headphones that Fred Meyer ever sold... Just had to add that in there...
2006-10-30 18:48:50 · update #1
Feanor is correct. The cancellation channel audio must be exactly like the curret offending noise in order to work and must be timed to within ten-thousandths of a second to be effective. Noise cancellation technology can work in a car but requires real-time microphone data in order to know what to cancel.
Also, these systems are most effective at the exact location of the microphone and less effective as you move away from it, which means that it could easily be optimized for one seating position but not for all. The most effective arrangement would require a separate noise reduction system for each seating position, each having its own microphone and speaker.
If you are talking about active noise reduction technology (requires power from a battery or other source), then the unit must have one or more microphones. Usually all you can see of these mics is the tiny set of holes holes on the back of each headphone earcup which allows sound in to the mics.
WK
2006-10-30 14:57:21 · answer #1 · answered by olin1963 6 · 0⤊ 0⤋
The problem is that background noise is fairly unpredictable...So any recording you make will not match the background noise in the future EXACTLY...it has to be exact to cancel any deviation may amplify it.
2006-10-30 13:32:23 · answer #2 · answered by feanor 7 · 1⤊ 0⤋
Seems like a good idea to experiment with. You should apply for a patent quickly.
2006-10-30 13:34:15 · answer #3 · answered by kc5uzd 3 · 0⤊ 0⤋