The speech jamming gun is a clever package but delayed audio
feedback has been with us for many decades.
Speech therapists can use it to treat stuttering because
it temporarily disrupts the broken feedback mechanism that makes
some people stutter.
If you have ever been startled to hear your own voice in
your ear a fraction of a second after you spoke in to the
telephone, you have experienced the effect. This is usually a
failure of what are called echo suppressors which briefly kill
the sound path back to you so you don't hear your own voice on
circuits that have a slight delay.
Martin
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