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Originally posted by Tedster:

This is a three-pager for sure... :D

YES!

"Meat is the only thing you need beside beer! Big hunks of meat and BEER!!...Lots of freakin' BEER."

"Hey, I'm not Jesus Christ, I can't turn water into wine. The best I can do is turn beer into urine." Zakk Wylde

 

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Originally posted by Philip O'Keefe:

http://homepages.tig.com.au/~audio/audio/eq1.gif

 

Any guesses? ;)

ummm....cost needs to be kept in check when split between choosing a young producer over a more experienced producer?
I've upped my standards; now, up yours.
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Originally posted by Philip O'Keefe:

Originally posted by antimatter:

Originally posted by Philip O'Keefe:

http://homepages.tig.com.au/~audio/audio/eq1.gif

 

Any guesses? ;)

 

(Just trying to do my part for a three page thread :D )

Speed of sound?
More specifically... ?
Speed of sound in air?
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Originally posted by antimatter:

Originally posted by Philip O'Keefe:

Originally posted by antimatter:

quote:

Originally posted by Philip O'Keefe:

http://homepages.tig.com.au/~audio/audio/eq1.gif

 

Any guesses?
;)

 

(Just trying to do my part for a three page thread
:D
)
Speed of sound?
More specifically... ?
Speed of sound in air?

Close enough. :thu:

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Hey Phil, is it the formula for calculating the dispersion of sound by decibels?

 

No wait, that's something else....

 

This is for calculating the speed of sound in air based on the air temp, right?

 

It's too early on a Monday to think like this........ :freak:

 

Cheers!

Spencer

"I prefer to beat my opponents the old-fashioned way....BRUTALLY!!!!"
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Originally posted by Spencer Crewe:

Hey Phil, is it the formula for calculating the dispersion of sound by decibels?

 

No wait, that's something else....

 

This is for calculating the speed of sound in air based on the air temp, right?

 

It's too early on a Monday to think like this........ :freak:

 

Cheers!

Spencer

The "rho" (the thing that looks like a "p" on the bottom) usually refers to density. Not sure what "gamma" represents in this particular equation. Been a long time.
"Cisco Kid, was a friend of mine"
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Originally posted by Spencer Crewe:

Hey Phil, is it the formula for calculating the dispersion of sound by decibels?

 

No wait, that's something else....

 

Diffusion is normally a function of surface geometry. dB's don't normally come into it - that's more a function of surface materials. Sound can do several things when it impinges on a surface: it can reflect, refract, absorb or be transmitted. Diffusion is related to reflections. At lower frequencies, sound is fairly omnidirectional, and room dimensions and modes are the primary concern. At higher frequencies, sound functions in more of a ray... angle of incidence equals angle of reflextion, unless there is a reason for the ray paths to "scatter" or diffuse. If a high frequency sound impinges upon a solid, flat surface at a 45 degree angle, then it will normally reflect at a 135 degree angle. An irregular surface will "scatter" or diffuse the sound, and the frequencies that are diffused will depend argely upon the frequency that you're dealing with and the dimensions of the surface geometry / irregularities.

 

The Quadratic Residue Diffuser is probably the most effective "real world" diffuser type. Here's a page with info on calculating the dimensions for a Quad diffuser:

 

http://www.mhsoft.nl/Diffusor.asp

 

This is for calculating the speed of sound in air based on the air temp, right?

 

The formula I posted is for calculating the velocity of sound in a gas...

 

Where c is the velocity of the sound waves

g (gamma) is the ratio of the specific heat at constant pressure to that at constant volume

p is the steady pressure in N/m2

r (rho) is the density of the gas in kg/m3

 

For air at 0°C and standard pressure:

g (gamma) is 1.403,

p is 101,333N/m2, and

r (rho) is 12927kg/m3

 

You do have to take various factors into account when calculating the velocity of sound. Density of the medium is one of them, as is temperature / pressure. Sound traveling in a steel beam will travel at a different velocity than sound traveling through air will.

 

http://audio-tech.freeservers.com/tech/acoustic3.htm

 

It's too early on a Monday to think like this........ :freak:

 

Cheers!

Spencer

 

Agreed - it's WAY to early for this stuff! :freak: But we're on a mission to get this thread up to three pages, so we all have to suck it up and do our part. :D

 

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Yes, once upon a time I did a research paper on how sound travels in different mediums - but that was 9 years ago. What did I have for breakfast, again? :D

 

Once upon a Physics class, I learned all of this but not having used ANY of the formulas since, I'm searching to recognize any of it - sort of one big mash of numbers and variables......

 

Anyways, it's still too early on a Monday afternoon (3:15 pm local) to be thinking about that stuff. :D:D

 

Cheers!

Spencer

"I prefer to beat my opponents the old-fashioned way....BRUTALLY!!!!"
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