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Audio Cancellation PRoject

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johan_tr2000

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Hi,

This may be the ambigious project.
I want to make my room completed with the Audio Cancelation circuit. The aim is to keep the room quit from the sound or noise from outside room (from door or windows). The idea is to put the microphone to sense the audio (noise), and then use the Microcontroller or DSP to make the opposite wave that cancel the audio or noise.

I think the circuit & firmware implementation is not that simple. do you?
Anyone have the idea or experience about this?
Please share.

Rgds,

TR2000 :)
 

It would not work so easy for the whole room, but it could be made for headphones, for the beginning...
 

it will depend what kind of voices ur enviroment has
 

Event the room is not so big (2x3)m, or inside the car (the noise from engine)?
The sound (noise) could be music frm other room, or the noisy engine in the car.
Some japanese car have this equipment.

Any idea?

TR2000
 

Hi, It is so quite about this topic.

How about using the microphone (loacted near the door / window)to catch the sound (noise), then use the DSP or microcontroller to generate the out of phase waveform (refer to the sinyal of the microphone).

Then use the second microphone (located in the room) as the feedback to fine adjust the phase and the amplitude, so needed the closd loop control.

Do you think this idea can be implemented?
Please give some comment or advise.

Rgds,

TR2000
 

I think that there will be some phase delay in different places of the room, and more than one sensor should be used.
 

Hi!

First of all, audio cancellation can be done for certain noise sources. There is a useful article on thin in one of the back-issues of "Analogue Dialog" from Analog Devices (year 2000, if I remember correctly).

Regards
 

Hi, Pixel

I agree with you about the phase differences, but if we can cancel the wave near the source (on the window, door, etc), so there is no wave can be propagate through the room. What do you think?

TR2000
 

I think that it could be done in that way.
 

But, anyone has try to implement it with real circuit?
Please share your idea for the real circuit.

TR2000
 

It is so quite about this project.
Any body have an idea or interested in this subject?
Please partisipate. Your help is really needed.

Thank you
TR2000
 

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