Hornresp

Hornresp Update 3940-150924

Hi Everyone,

The error detailed in Post #5734 has now been fixed. My thanks to Twellmann for reporting the problem.

For the test example given in Post #5734, the horn mouth peak sound pressure at 28 Hz has changed from 29788.0696 Pa to 229.5493 Pa.

Sanity check:

Mouth peak pressure = 229.5493 Pa
Mouth rms or effective pressure = 229.5493 / Sqrt(2) = 162.3159 Pa

Mouth sound pressure level = 20 * Log10(162.3159 / (2 * 10 ^-5)) = 138.1866 dB

Half space SPL at distance of 1 metre = 134.6590 dB

Kind regards,

David
 

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Hi Everyone,

The error detailed in Post #5734 has now been fixed. My thanks to Twellmann for reporting the problem.

For the test example given in Post #5734, the horn mouth peak sound pressure at 28 Hz has changed from 29788.0696 Pa to 229.5493 Pa.

Sanity check:

Mouth peak pressure = 229.5493 Pa
Mouth rms or effective pressure = 229.5493 / Sqrt(2) = 162.3159 Pa

Mouth sound pressure level = 20 * Log10(162.3159 / (2 * 10 ^-5)) = 138.1866 dB

Half space SPL at distance of 1 metre = 134.6590 dB

Kind regards,

David
What is the comparable throat pressure?
 
Hi Andrew,

3.7kPa is quite low.

Not when it's pressure due to sound :). An effective pressure of 3.7 kPa is equivalent to an SPL of 165 dB.

What pressures are we expecting when designed start talking about distortions due to over driving?

It depends on the amount of distortion you are prepared to tolerate. The Hornresp Sample tool will give you the percentage second-harmonic distortion for single-segment horns.

Kind regards,

David
 

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Last edited:
And now for something completely different.

Hi David,

There is an old Cologne, Germany carnival song that states "Drei mol null es null es null" (3 x 0 = 0 = 0) , so I assume your calculations of your tech support wages are spot on. :) Thank you.

I'm sitting with SWMBO in Rom, and we are trying to straighten out the mess, credit card accounts, and bank accounts that were affected by her wallet being stolen out of her purse. Note to anyone who cares: don't assume that there is anything on you body that is safe from theft in Rom; those guys are good. Even in a closed purse, it's not safe. Always keep you wallet in your front pocket under one hand. Don't let anyone push you. All the people you have to deal with in the hotels, etc. are just great, but there are others. Well, so much for the travel report, with any luck it won't be to long until we're back home. If you plan a trip to Rom, go to Paris. :)

Regards,