[nobb]

I have a carpc (a computer system in my car running windows xp) and I am wondering if there exists any software that could be run in my carpc to do some sort of electronic noise cancelling to reduce the road noise (but still preserve the music). Eg. setup a microphone, run the software, and play the inverse of the road noise through the speakers to cancel out the noise.

I realize alot of variables come in when it comes to electronically cancel out unwanted noise, especially in an acoustically unfavorable environment like a car. But I am just wondering if anyone knew of any software that maybe I could play around with.

Suggestions and comments welcome. I know this is somewhat of a silly question (and probably wont work), but oh well...I am open to ideas and your opinions.

 

[jameshan]

Quote:

Originally Posted by nobb /img/forum/go_quote.gif I have a carpc (a computer system in my car running windows xp) and I am wondering if there exists any software that could be run in my carpc to do some sort of electronic noise cancelling to reduce the road noise (but still preserve the music). Eg. setup a microphone, run the software, and play the inverse of the road noise through the speakers to cancel out the noise. I realize alot of variables come in when it comes to electronically cancel out unwanted noise, especially in an acoustically unfavorable environment like a car. But I am just wondering if anyone knew of any software that maybe I could play around with. Suggestions and comments welcome. I know this is somewhat of a silly question (and probably wont work), but oh well...I am open to ideas and your opinions.

Hi there,

I guess you are someone like me that willing to do experiments with new technology. I am also trying to do a research on this topic. I am driving a Honda CRV and the road noise is killing me.

If you have already found the software to perform the NC, please let me know. If not, lets keep in touch and explore this together.

James

 

[nobb]

Hi,

Do you have a carpc too? This was a fairly old post, but I'm glad someone eventually replied.

I have done alot sound deadening work on my car (2002 Mazda Protege) and it is fairly quiet now. The majority of the remaining road noise is low frequency noise which I figure would be easier to cancel out due to its non directional nature (so would not be too picky on microphone placement).

With any vehicle, I believe there are certain structural limitations to how much noise can be physically blocked by the existing material. With lower cost vehicles such as mine (and maybe even yours), they obviously are not designed with as much scrutiny to reduce road noise as a high end vehicle like mercedes. Those vehicles are designed from the ground up to sound quiet, whereas the common everyday vehicle is designed to save cost. There is a certain point when adding more sound deadening material either wont be feasible (eg. wont fit), which is why I am interested in a software/electronic based solution to this issue.

Unfortunately I have yet to find any software to perform this task. One reason I doubt a software based solution (that would have to go through a computer system) would work is due to the lag time. Sound has to enter the microphone, go through a bunch of layers in the operating system, processed by the software, then go through another bunch of layers before being outputted. I am definitely not an expert in this area, but I would love to experiment.

 

[bnunes]

Nobb:
I've given a lot of thought to this. You're right, it's all about the timing of the record/playback inversion. But it would only be a few miliseconds, maybe not enough difference to have an effect on the ears.

Or if there is a difference maybe your software could intelligently account for that. I just wish i was a rich man and could hire a software developer to design a prototype =)

 

[Scottsmrnyc]

I had noise coming from my laptop; but into my home stereo system not my car. You might try something called a Audio System Ground Loop Isolator made by Radio Shack. The part cost about $17. The part number is 270 054. It might work and it might not work. Scottsmrnyc

 

[JMT391]

If you're talking about reducing road noise, software will not help. Road noise is affected by the suspension system, the tires, and the material of the car. Software cannot stop any of these things from causing road noise.

What you need is some good sound deadening material. Something like damplifier would work. There are others, like RAMMAT, that you could look into as well. This stuff is applied directly to the car's metal, and works to keep your music in the car, and the road noise out. It works sort of like an IEM when it comes to isolation, which as we all know, makes a huge difference.

You can check out DIY Mobile Audio to see what people have done to apply the stuff as well as watch some instructional videos.

Hope that helps

- Of course, all of this is said with the assumption that you are not afraid to tear your car apart. Since you have a car PC, I thought it was safe to assume.

EDIT: Totally skimmed over the part where you said you did a lot of deadening work. My apologies