Long range directional microphones-myth and reality

There are a lot of myths about directed long range microphones. You can here like they can reach distances of 100, 200 and more meters, other say that this is a myth and these numbers are commercial purposes. Lets try mathematically find a proof and see real situation. Introduction to long range microphones When talking about directed microphones usually we have in mind that sound sources are in open air, and there is no reverberation effects. So the only factor is distance of sound source object from microphone. Along the distance sound power drops significantly and ir longer ranges it interfere with other sounds like wind and other noises in atmosphere. So when distance is about 100m sound pressure drops more than 40dB(comparing to distance equal to 1m). So if sound level is 60dB then from 100m you will hear 20dB. Sound level 20dB is less than other environmental noise…

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