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Noise cancelling system from Bose

http://www.autotrends.org/2012/09/28/innovative-bose-and-noise-cancellat...

This will fit model s perfect. Aimed to cancel out wind and tire noise, less weight and less nois... How quiet can a tesla become? How much weight can be saved?

Has just recently been discussed here, including a statement directly from Tesla:
http://www.teslamotors.com/de_DE/forum/forums/cabin-noise-0

Thanks:-) missed that one

Does anyone else notice that nc headphones increase pressure on the ears? It is quieter but less comfortable.

Yep. The eardrum and sensory hairs are trying to beat and un-beat at the same time! Very stressful.

Noise canceling headphones do not by necessity use pressure or sound blocking materials. They create destructive interference that literally cancels the sound pressure waves arriving at your eardrum. Most noise canceling headphones do use some passive (noise blocking) and active (noise canceling) functionality, which is why people notice the pressure.

In the automotive world, the passive systems consist of blocking technology, such as foams, or anti resonance technology such as mats. These add weight and bulk. The active systems consist of microphones and electronics that generate 'inverse noise' that cancels out the sound pressure waves of the noise. The problem with this type of system is that the noise canceling waves aren't generated at the source or at the receiver, making destructive interference difficult to maintain throughout the cabin.

It may be complicated to add microphones in the appropriate locations, and insert the proper electronics into the system to retrofit the technology into the Model S. That said, based on published noise measurements, the S is a pretty quiet car around town and at speed.

I nice forum thread about cancelling... check the active noise cancelling graphs towards the bottom of the forum post.

http://www.head-fi.org/t/468510/portable-audio-tech-info-gallery-56k-war...

While noise can be passively reflected, dispersed or absorbed. Noise cancelling systems are based on active generation of an anti-phase signal where the noise is picked up by a microphone, amplified and sent to a speaker positioned so that the 180° out of phase “anti-noise” cancels the objectionable noise signal. Both the noise and the anti-noise sounds would by themselves sound identical, but together would cancel. Ideally this would mean that the listener would feel no pressure and hear nothing.

Noise cancellation can work well if there is a well-defined noise source or a well-defined listening position. With a well defined noise source, a speaker placed near that source can cancel the noise over a wide area. Noise cancelling earphones work well as the location of the ear is well defined relative to the microphone and speaker. Cancelling noise from a variety of diffuse sources such as wind and road noise, over a wide area such as the cabin of an automobile, I would guess is more problematic.

@shs - not to mention impossible to do completely if there are multiple listeners, unless you put headphones on all of them. That doesn't mean that you can't get some noise reduction, but it isn't as easy as noise cancelling headphones or even a phone that has two microphones.


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