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Natural Science Forum / Physics / Acoustics / 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. Affan. On 3/27/06 8:14 PM, in article 1143519245.887574.20280@t31g2000cwb.googlegroups.com, "Intiha" <intiha@gmail.com> wrote: > I am not sure about this, so I wanted to confirm about this. > [quoted text clipped - 14 lines] > > Affan. I find it very difficult to plow through your language usage. In any event, ordinary acoustic propagation invokes linear physics. Under those conditions, signals will pass through each other without affecting them. Bill -- Ferme le Bush >I am not sure about this, so I wanted to confirm about this. > [quoted text clipped - 14 lines] > > Affan. Affan, you should be aware of the fact that sound waves propagate in 3D (i.e. in spheres in an isotropic medium), so the term "direction of propagation" is misleading. If the sound energy is not too high, a sound wave is a linear system - thus mixing (interfering) without affecting each other (= the waves "go through" each other). Maybe you want to have a look at the classical double slit experiment: http://www.vias.org/physics/bk5_05_06.html This experiment clearly shows the linearity of the wave propagation (otherwise the interference pattern would have to change immediately after the two waves have encountered). Regards, Hans >>I am not sure about this, so I wanted to confirm about this. >> [quoted text clipped - 14 lines] >> >> Affan. Sound is only a scalar field. Potentials are based on pressure for sound, i.e., only gradients in pressure affect the sound. Only at the boundary of two pressure waves or medium would there be interaction. > If two acoustic signals interfere along their path, but the receiver is > not in the interfering region (e.g. the direction of propagation is [quoted text clipped - 5 lines] > > e.g. A is sending to C at the same time B is sending to A. The two waves will pass through each other with their original identities intact. It's called superposition. Where they meet there will be constructive or destructive interference depending on the waves themselves, but once they pass each other, they'll continue as before.  SignatureJay Frigoletto Mastersuite www.promastering.com Jay-atldigi <atldigi@aol.com> wrote in news:atldigi- 4A1396.13482629032006@news.verizon.net: >> If two acoustic signals interfere along their path, but the receiver is >> not in the interfering region (e.g. the direction of propagation is [quoted text clipped - 10 lines] > be constructive or destructive interference depending on the waves > themselves, but once they pass each other, they'll continue as before. That is true most of the time at low and moderate sound levels, but there are exceptions. One exception is the situation involving two high- intensity ultrasonic signals that cross at some location. If one signal is at 50KHz and the other is at 52KHz, the two signals will interact nonlinearly at the location where they cross and 2KHz signal will be present at that location. If you put a microphone or your ear at that location, you will measure and/or hear the 2KHz signal. Thank you all, I was just unsure if the acoustic waves might behave differently due to some thing that i might be unclear about. Regards Affan |
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