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Re: lefreQues

Author: Luuk ★2017
Date: 2023-08-03 11:57

The patent (https://patentimages.storage.googleapis.com/1a/c4/ad/5d2da9ba417b34/US8884143.pdf) states that the Lefreque 'bridge' passes 'vibrations' of the instruments body from one part of the body to the following part.
It states that these frequencies are not evenly spread out over the body because the fittings (tenons, soldered joints...) hinder this. This would be a bad thing. (All in my wording).

As I understand from the patent text, the outer part of the two parts of the LeFreque-thing is only used for pressing the inner part against the instrument's body, like a reed binder is used for pressing a reed against a mouthpiece. The inner part does the 'vibration job'.

If this is all true it explains the observation that a metal, thin walled instrument seems to be more influenced by this invention than a thick walled instrument, especially when the latter is made from wood. Relatively thick wood has a much higher frequency impedance and dampening effect than thin metal, thus leaving a less pronounced role for these wall vibrations in the resulting sound.

Looks like a Dutch invention...

Regards,

Luuk
Philips Symphonic Band
The Netherlands

Post Edited (2023-08-03 12:05)

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lefreQues

Ebclarinet1

2023-07-28 17:26