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Natural Science Forum / Earth Science / Oceanography / March 2006Acoustic propagation
I am not sure about this, so I wanted to confirm about this. If two acoustic signals interfere along their path, but the receiver is not in the interfering region (e.g. the direction of propagation is opposite for both signal) will the signal still be receiver faithfully at the receivers (where the signals donot over lap in time or space). Eg. A -------B--------- C e.g. A is sending to C at the same time B is sending to A. Assuming a small pkt size (less than propDelay b/w A and B) will the pkt get received at both C and A faithfully? I am not sure about the effect of interference on acoustic propagation, maybe some one can help in this regard. I am not sure about whether this is the right group to ask, but its worth a shot. Affan. > I am not sure about this, so I wanted to confirm about this. > [quoted text clipped - 15 lines] > I am not sure about whether this is the right group to ask, but its > worth a shot. Sci.physics might be a better shot or even sci.military.naval. Interference in the form of antinoise will be an unlikely phenomenon, easily overcome with military equiptment. As for faithful reception, that depends on what recievers you have. Sound moves in a spherical direction; that is, all else being equal, it will move in every direction at the same rate. The problem with submarine detection is that there is always a difference of some sort be it temperature or density. So a lot of the training of asdic operators concerns learning about the lensing action of water. > > I am not sure about this, so I wanted to confirm about this. > > [quoted text clipped - 17 lines] > > > Sci.physics might be a better shot or even sci.military.naval. Unless you're talking about extreme pressures like shock waves, then most sound propagation environments are linear and superposition holds. The signal from A propagates mostly unchanged through the disturbed region. It shouldn't be hard to set up the experiment with baffles and speakers. Might be interesting to try. Turn up the volume at B until A can't hear C anymore, and perhaps can't hear his own signal. Then see how it sounds at C. - Randy |
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