Why does feedback loop noise turn high pitched?
In: Technology
IT has been asked before – https://www.reddit.com/r/explainlikeimfive/comments/2wjkof/eli5_why_does_audio_feedback_always_sound_like_a/
One reason is that performers and sound technicians like microphones that sound ‘sharp’ – ones that emphasize the high pitched sounds. But this also emphisizes the high pitched sounds in feedback, which is why the low frequencies in feedback get drowned out by the high ones.
feedback can happen at pretty much any frequency in the entire audible range of 20hz – 20khz.
in a live sound situation the devil is in the details – which re-emitted frequencies from the speakers are hitting the mic at the same or higher level than those same frequencies being picked up by that mic from the rest of the environment? if there are frequencies picked up at a higher level, they will add to the source going into the mic and thus increase the speaker output of those frequencies etc. etc. leading to feedback.
source- am audio engineer.
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