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Want to create an audio-based silencer, like a Stealth Airplace

post #1 of 10
Thread Starter 
Ok, in case you guys don't know, a Stealth Airplane is kept quiet by an inverse sound wave generated that cancels out the noise from it's engines.

So I was thinking, why not do this with a PC?!

Should be simple:
1. Record the noise produced by your computer
2. Edit it to create an inverse sound
3. Play the sound at a high enough amplitude to collide with the sound being produced by computer to cancel it out!

Sound good? Think is as simple as it sounds? I'll be posting my results later, right now I'm watching Volcano on AMC! If you're not... you should be!!!
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WaterWorks
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post #2 of 10
One thing that I've noticed and might help you... I encode anime so sometimes I play two videos in parallel to compare the "feel" of the video, so I have the audio playing twice.

If I sync it up perfectly, the bass is completely canceled out (inside my headphones) and the sound seems much more flat, though this isn't the same thing... in my case, it seems to just be because the same sound is played twice at exactly the same time, so it collides inside the speaker and never comes out.
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post #3 of 10
Thread Starter 
Hmm... well thanks for that info, but how exactly does that help/shine light on this?

Don't mean to sound rude at all!
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post #4 of 10
Well, you've got some problems to work out.

First off, an audio-based silencer is going to require some bad-ass speakers to work. I hope you've got them

Second, it's more complicated than that. The Nighthawk uses not sound waves, but actually buffeted air waves that are crushed by specially sculpted engine nozzles when the plane moves.

Third: think relativity. While the airplane might not be heard at all once it's a ways away, it's still loud as hell when you are right there next to the plane. Apply this to your computer...

Fourth: it's a bit unrealistic, considering the following: your computer's sound pattern will never stay the exact same. Fan speed will wear over time... even a few RPM's slower will result in a different sound pattern, and you will get screwed and have to re-record the buffer in order for it to work. Another factor is the fact that every time you boot the computer, you are gonna have to loop the sound.

And is your computer really so loud that you have to create an audio-buffer?

My suggestion would be to rethink your options. Remember what I said about the specially sculpted body parts? Think about applying that to a fan or something... maybe some special piece of vinyl or cardboard or something that will cut out sound while staying out of the way of airflow.
    
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by SentryOptic View Post
Well, you've got some problems to work out.

First off, an audio-based silencer is going to require some bad-ass speakers to work. I hope you've got them

Second, it's more complicated than that. The Nighthawk uses not sound waves, but actually buffeted air waves that are crushed by specially sculpted engine nozzles when the plane moves.

Third: think relativity. While the airplane might not be heard at all once it's a ways away, it's still loud as hell when you are right there next to the plane. Apply this to your computer...

Fourth: it's a bit unrealistic, considering the following: your computer's sound pattern will never stay the exact same. Fan speed will wear over time... even a few RPM's slower will result in a different sound pattern, and you will get screwed and have to re-record the buffer in order for it to work. Another factor is the fact that every time you boot the computer, you are gonna have to loop the sound.

And is your computer really so loud that you have to create an audio-buffer?

My suggestion would be to rethink your options. Remember what I said about the specially sculpted body parts? Think about applying that to a fan or something... maybe some special piece of vinyl or cardboard or something that will cut out sound while staying out of the way of airflow.
Hmm... thanks for the thoughtful reply!! Very interesting... how about instead of recording, having a continuous open recording that has hardware based effects applied, and then the audio sent straight to the speakers?

As for the bad-ass speakers, do you mean high DB?

You're right, I didn't think about that it was very loud close up... hmm... maybe this would just be good for silencing ambient noise then?
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post #6 of 10
The speakers would not have to play any louder than the computer - but - if they don't have perfectly flat frequency response (they don't) and your mic does not have perfectly flat response (it doesn't) then you're going to only effectively "cancel" the parts of the spectrum that can be reproduced accurately by the equipment. Another issue to content with is that while noise from your computer is omnidirectional, noise sound from your speakers is not.
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post #7 of 10
Like the others have said, it's a good idea, but probably not the best solution to this particular problem

Good thought though!
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post #8 of 10
Quote:
Originally Posted by AMD+nVidia View Post
Hmm... thanks for the thoughtful reply!! Very interesting... how about instead of recording, having a continuous open recording that has hardware based effects applied, and then the audio sent straight to the speakers?

As for the bad-ass speakers, do you mean high DB?

You're right, I didn't think about that it was very loud close up... hmm... maybe this would just be good for silencing ambient noise then?
Sorry for the late reply

Anyways, as far as the "Bad-ass speakers" I was talking about the fact that your speakers are going to have to have a pretty large range of output. i.e.: You can't have a set of speakers that sound like ipod headphones, or this would never work.

And for silencing ambient noise... grab some noise-cancelling headphones or try the sculpted thing I suggested earlier
    
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post #9 of 10
It's SOO MUCH more complicated then that.

First off the most important thing to get that right is that the sound from speakers and the sound from the computer have to reach your ears at the exact same time. You'll spend ages aligning the speakers and getting the acoustics right. Just one shift of the head a couple of degrees will mess it up.

Even though a fan is a continious sound, playing back a recording will not produce the same sound as what is being made live. You'd need do be recording and outputting at the same time with low latency. The microphone and speakers would have to work miracles and be purely accurate.
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post #10 of 10
A lot of cars use this technology but they just bend the air that is creating the noise and pass it by itself. Mufflers often do this. Also some intakes do this as well.

Using tubes on a computer will most likely not result in much help because the noise is already low. It is often vibrations throughout the case , and motor whine that generate the most noise. Generating the noise by recording it and then playing it back will be very difficult. You would need a very good preamp with a very good EQ to tune the sound output to match it perfectly.

Me and a co-worker tried to generate feedback at the same frequency as a crystal glass and we could barely get the glass to vibrate. The goal was to bust it. And we had very high end equipment. I think maybe if we played with it longer we may have got better results but we had work to do as well. We had the Yam PM5D as a mixer which has fully parametric EQs, compressors, gates, and an array of effects built in. I don't know if you could do it with what we had. Needless to say what we had was a lot. I think it would be easier to just use sound deadening materials to try and absorb the sound.

Any way you look at it though I am sure it would be fun to try and silence it. Try it out and let us know how things turn out .
    
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