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<DIV><FONT size=2>Thanks to Tom Cole, Ron Nossaman, and Richard Brekne =
for
responding to my post.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>This is a real can of worms. I'm still =
fishing,
even if my license has expired.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>I've just spent some time looking at the wapin.com =
site.
They say that wapin improves sustain. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Okay, Ron, if you think that it is supposed to =
keep the
string vibrating vertically, then the sustain must be less.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>I'm not sure exactly what some of the parameters of =
the curves
they show mean, but one important factor is missing. The HP =
dynamic signal
analyzer, I'm not familiar with. I'll call HP Monday and =
find
out. The factor that is missing is time. The curve of the =
wapin
piano in log mode shows all partials out to number 39 and then =
stops. The
note used is d3. The 39th partial is 5726 Hz theoretically, but =
stretch
may make it much higher.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Now, I would like to know the time that the reading =
was
taken. From time zero (when the hammer hits the string) amplitude =
of the
partials vary dramatically as they phase in and out. A plot of the =
level
of partials versus time would be very meaningful. A plot of each =
partial
versus time would get tedious, but a plot similar to Weinrichs giving =
the
overall loudness of the total signal would give us the answer to what =
the decay
would be. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I suspect the graph shown of the wapin piano =
averages the
amplitude over a time period. For it to be meaningful we need to know =
what that
time period is.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Richard, I wouldn't fret that you're not an acoustic =
professor. Nothing will destroy your common sense faster than a =
formal
education unless it would being elected to public office. Do you =
really
think that those that have access to that fancy equipment have the mind =
to use
it?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Fascinating subject to be sure. My interest is =
fueled by
the obscene charge to license wapin.</FONT></DIV>
<DIV><FONT size=2>Nothing would delight me more than finding a way to =
equal or
improve on wapin with out infringing on their patent.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Keep those cards and letters coming in.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Carl Meyer</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
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