Can,(by distructive interference)echo in a room be reduced by using speakers which transmit unhearable frequencies?
by 
andykk
ANSWERS: 1
-
I don't think so. If the reverberation is in the audible range then you would need similar frequencies to destructively interfere with them. This is how noise-canceling headphones work -- they pick up extraneous sound, invert it, and mix it back with the audio signal to cancel the noise. A similar trick can be done with speakers -- I have an old stereo pre-amp made by Carver with a feature they called 'sonic holography', where a portion of the left channel is inverted, slightly delayed, and cross-fed to the right speaker & vice-versa. This is supposed to allow the left ear to hear only the left speaker & right ear only right speaker -- for improved stereo imaging. If you knew the exact acoustics (room dimensions, location of sound source relative to walls, etc) you could -- in principle -- cancel the reflections and allow only the original sound to be heard. In reality, however, this would be nearly impossible for many practical reasons.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC