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Thread: Measuring the distance from a sound sensor to the unknown sound source

  1. #1 Measuring the distance from a sound sensor to the unknown sound source 
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    Let us assume that I have two microphones and I know the distance between the 2 sound sensors. Is it possible to measure the distance of an unknown sound source using no more than those 2 microphones? If yes, how can it be calculated, and if not, what changes would I have to make in the setup? Also, I am taking one of the two sound sensor as the origin point of the layout.


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  3. #2  
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    Do you know the speed of sound? If so measure the time it takes for each sensor to respond after the sound source is switched on. This can be used to calculate the distance of the source from each sensor. Use the three distances and trigonometry to locate the source.


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    Don't forget - you'll get two valid answers for the location of the source.

    If you want to narrow it to one, you'll need at least one more mic.


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    Quote Originally Posted by DaveC426913 View Post
    Don't forget - you'll get two valid answers for the location of the source.

    If you want to narrow it to one, you'll need at least one more mic.


    No. you need 4 mics. Your answer assumes the mics and the source are on the same plane. 2 mics only gives a distance from a line through the mics. In 3 dimensions that defines a circle centered on the line. 3 mics produce a plane where the source can be in either of 2 points above or below and the distance from the plane.

    However the question was not the position of the source. The OP setup is all that's needed to determine the distance to the source.
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