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From: "Phil Allison"
Subject: Wombat's Revenge
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sun, 19 Jan 2003 12:45:50 +1100
NNTP-Posting-Date: Sun, 19 Jan 2003 12:35:44 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
Hi to all, esp Mr Gibbon - no insult to primates intended.
This morning one of my customers dropped the 5 Hz shifter I sold him
three years ago back to me so I could run some tests - especially with Mr
Gibbon's infamous wav file.
You may recall that the shifter actually used to produce the file was
not described and Mr Gibbon *refused* to describe it when I asked.
Also no low frequency sine wave signals were included to demonstrate
the shifter was free of defects like amplitude modulation. One only needs
an audio gen and scope to test for this problem which is characteristic of
cheap and nasty shifters intended to work on speech only.
So, I fed the wav file organ tone through MY shifter and the difference
is dramatic - practically all of the dissonance and beating produced by the
anonymous shifter is GONE.
I also tried some recordings (CDs) of organ music, classical and pop
(inc the intro to the Animals "Worried Life Blues" with Alan Price at the
Farfisa? organ) and there is **no** audible dissonance or beats.
All the claims I posted previously are correct. Organ music IS the
most difficult test since there are sustained low tones rich in harmonics.
Anything else with no such tones is a piece of cake.
Mr Gibbon is a fraud, he was well aware the shifter he used was a garage
built cheapie with defects and deliberately hid that fact.
I know of only two full audio band, high performance anaolgue frequency
shifters - the American made "Polyfusion 745" and my design.
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