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From: "Phil Allison"
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 16 Jan 2003 07:45:28 +1100
NNTP-Posting-Date: Thu, 16 Jan 2003 07:34:52 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Gibbo" wrote in message
> "Kevin Aylward" wrote:
> >Gibbo wrote:
> >> Ok Phil
> >> I borrowed a 5Hz frequency shifter form a sound reinforcement company.
> >> We played the following notes concurrently on a synth.......
> >> E - 2, B - 2 and E +1. For the unititated these are the low E on a
> >> standard guitar, B a fifth up from this, then another E, 2 octaves
> >> higher. We recorded it and have posted it here....
> >> http://www.members.aol.com/chrisgibbogibson
> >> The file is called 5HzShift.wav The first 3 seconds are the 3 notes
> >> played direct. The last 3 seconds are the same notes played through
> >> the 5Hz shifter (we simply switched it on while holding the keys
> >> down).
> >> We also did the same thing an octave lower (still nowhere near the
> >> bottom of the music range) and the results were, as expected, even
> >> worse. However typical PC speakers won't even reproduce it so it
> >> seemed pointless posting it.
> >Well, my crappy PC speakers certainly showed the difference.
> >The reality is that you need to shift by a fixed ratio, not a fixed
> >frequency,as in speeding/slowing a tape recorder.
> You try to convince Mr Wombat of that.
** Pitch shifting is not effective against acoustid feedback induced by
> I suppose it is possible that he genuinely can't hear it in which case no
> amount of arguing will ever convince him.
** I suppose the Gibbon genuinely cannot reason properly.
Two people have posted backing up my story - is he blind as well as
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