Glad there is new interest in the Fully Tempered Duplex Scale, (FTDS), I think around 30 pianos have been fitted with now. If all is properly done, the clarity, warmth, sustain and power of the top treble sections is wonderful.
FTDS allows one to optimize the pivot termination function, control noises created by Longitudinal modes and avoid consonance between the duplex segment and the speaking length. The Acetyl co-polymer duplex rests allow for very smooth tuning in the treble as well. Plus a corroding string can't bond with the co-polymer because nothing in the known universe bonds with the stuff.
My work developing FTDS also allows me to better understand how inaudible Longitudinal mode energy can be coupled into the transverse string modes creating false beats. Much of the objectionable noises we hear in piano scales that I and others used to attribute to inharmonicity is actually due to L-mode interactions with T-modes.
L-mode scale modeling has allowed me to solve scale problems better than just about any other modeling scheme I know of. I believe it is why Hybrid Wire Scaling Protocols are so successful.
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Edward McMorrow
Edmonds WA
425-299-3431
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Original Message:
Sent: 01-31-2019 19:11
From: Peter Grey
Subject: Journal article in march on "Fully Tempered Duplex Scale'
Since the purpose of a patent is to give the inventor exclusive use of the invention (and presumably to make money), the verbiage in the patent is inherently legal, technical, and very hard to understand. This is by design. If the inventor makes it easy to understand it partially defeats the purpose. It's the book sales that simplify it and picture it where the money is to be made, as well as licensing the process or technology.
The lawyer will tell you not to make it easy to understand, but rather to cover every possible base that could be imitated, and do so in technical language that only a lawyer can understand.
Pwg
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Peter Grey
Stratham NH
603-686-2395
pianodoctor57@gmail.com
Original Message:
Sent: 01-30-2019 22:27
From: Chris Chernobieff
Subject: Journal article in march on "Fully Tempered Duplex Scale'
Yes, this is an older thread, but did Ed McMorrow ever clarify the concept?
-chris
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Troubles are Bubbles, and they just float away.
chernobieffpiano.com
grandpianoman@protonmail.com
Knoxville, TN
865-986-7720
Original Message:
Sent: 10-06-2015 21:13
From: Delwin Fandrich
Subject: Journal article in march on "Fully Tempered Duplex Scale'
Yes, having been through the process once, I agree: Congratulations. In today's world this is neither easy nor inexpensive.
Del
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Delwin D Fandrich
Piano Design & Manufacturing Consultant
6939 Foothill Court SW, Olympia, Washington 98512 USA
Email
ddfandrich@gmail.comTel 360 515 0119 -- Cell 360 388 6525
Original Message------
Congrats Ed