Opamp "echo remove" & "phase sound" audio bandpass filter
LINKS TO AUDIO PRE_AMPS & FILTERS IN THIS TEXTBOX.This filter was specially designed to correct afterwards (after the recording) audio recordings with a lot of echo, e.g. in churches. The voice/sermon is weak, compared to the echoes and the background broadband audio noise. And each cough sounds like a gun shot. This filter cuts off high and low frequencies, so that the recorded voice gets more "presence". This only works with the 50 K potentiometer in a certain position (see video). Because it is a very sharp audio filter, it also adds (some) noise, e,g, as if the sound is heard via a "pipeline". (bandpass 2 KHz - 7 KHz). But, after all, the voice can be brought to the front and the echoes to the background. More audio in my book "Schematics 2, audio amplifiers and loudspeaker boxes" (author Ko Tilman). The circuit can also create something like a "phasing" sound.
AUDIO FILTERS (schematics/bass boost-high cut, sound effects etc).
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