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Old 23rd October 2019, 05:03 AM   #561
ScottG is offline ScottG  United States
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Originally Posted by gedlee View Post
You'd have to give me an example, but at any rate it never happens in acoustics.
..um, rate-*dependent Hysteresis?

*which is still Hysteresis.



..can't think of any rate-independent or "permanence" effects for acoustics though. Surely there must have been a Monty Python script about an infinite echo though..
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Old 23rd October 2019, 08:02 AM   #562
mabat is offline mabat  Czech Republic
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I'm afraid you would have to call anything with an impulse response longer than an infinitely short duration to have a "hysteresis", i.e. the ability to "remember" its history beyond input stimulus. I'm only not sure that would be very meaningfull. In this sense the horn really does "remember" that e.g. an impulse was sent before because it takes some for the sound waves to leave the horn - can be bouncing around for a while.
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Old 23rd October 2019, 08:32 PM   #563
ScottG is offline ScottG  United States
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Hysteresis - Wikipedia

"Hysteresis can be a dynamic lag between an input and an output that disappears if the input is varied more slowly; this is known as rate-dependent hysteresis. However, phenomena such as the magnetic hysteresis loops are mainly rate-independent, which makes a durable memory possible."
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Old 23rd October 2019, 08:41 PM   #564
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Hysteresis - Wikipedia

"Hysteresis can be a dynamic lag between an input and an output that disappears if the input is varied more slowly; this is known as rate-dependent hysteresis.
This makes it a nonlinear phenomena and horns and waveguides are linear devices.
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Old 23rd October 2019, 10:11 PM   #565
uraberg is offline uraberg  United States
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This tool is of tremendous help to me. Thanks for making it available!

Will future iterations allow for different curves? Horn exits projected onto a curved surface?

Below is my mockup of a 9.6" waveguide on my radian 760neo, fresh off the printer after I knocked down the support a little.
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Last edited by uraberg; 23rd October 2019 at 10:13 PM.
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Old 24th October 2019, 08:40 AM   #566
mabat is offline mabat  Czech Republic
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Hysteresis - Wikipedia

"One type of hysteresis is a lag between input and output. An example is a sinusoidal input X(t) that results in a sinusoidal output Y(t), but with a phase lag φ... Such behavior can occur in linear systems... it is mathematically equivalent to a transfer function in linear filter theory and analogue signal processing."

I just don't get why would anyone want to talk about that as of hysteresis. I have never seen the term used like that.

Last edited by mabat; 24th October 2019 at 08:43 AM.
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Old 24th October 2019, 08:57 AM   #567
mabat is offline mabat  Czech Republic
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Originally Posted by uraberg View Post
Will future iterations allow for different curves? Horn exits projected onto a curved surface?
What do you mean by different curves?

Future release I'm working on should allow for almost anything: non-planar exits, arbitrary cross sections, even non-circular throats... Anything you could imagine, provided you will be able to express that in the language of the waveguide formula parameters. I guess that will take volunteers to develop such models. The tool will definitely allow for this and some basic shapes may be incorporated there right away.

I only can't say when it will be ready. Honestly, I'm not overly motivated...
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Old 24th October 2019, 09:13 AM   #568
jzagaja is offline jzagaja  Poland
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Anyone interested in comparison between slot loaded Keele's waveguide and STH?
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File Type: jpg Snap11 HD-1050 V4 Rear View wi Dims.jpg (99.0 KB, 259 views)
File Type: jpg Snap9 HD-1050 V4 Front View wi Dims.jpg (79.9 KB, 260 views)
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Old 24th October 2019, 01:49 PM   #569
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Old 24th October 2019, 01:51 PM   #570
gedlee is offline gedlee  United States
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Quote:
Originally Posted by mabat View Post
Hysteresis - Wikipedia

"One type of hysteresis is a lag between input and output. An example is a sinusoidal input X(t) that results in a sinusoidal output Y(t), but with a phase lag φ... Such behavior can occur in linear systems... it is mathematically equivalent to a transfer function in linear filter theory and analogue signal processing."

I just don't get why would anyone want to talk about that as of hysteresis. I have never seen the term used like that.
Agreed, by that definition all systems have hysteresis.
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