GODDAM IT RICK, I sure wish you hadn't done that - got any MORE salt you can rub on things? Crap...
WHOAH Steve!! Excuse me? I did NOT mean to pour salt on anything! On the contrary. This has to do with scientific explanations of things, and when I find conflict of direct definitions from people I consider authority on the subjects, I want to clear it up so I understand FACT. At this level it has nothing to do with "fueds", opinion, conflict, accusation, salt or what ever. It is simply a matter of scientific fact, PERIOD!
My first exposure to STANDING WAVE/ROOM MODE relationship was at Homerecording.com, and was what I consider "netfact" when compared to statements I previously read in The Master Handbook of Acoustics by Alton Everest. Hence my quest for a better understanding, as even Mr. Everest leaves much to be desired when it comes to a direct STANDING WAVE/ROOM MODE definition. Let me quote him here for clarity.
On Page 87....
" TWO WALL RESONANCE
Figure 6-3 shows two parallel reflective walls of infinite extent. When a loudspeaker radiating pink noise excites the space between the walls, the wall-air-wall system exhibits a resonance at a frequency of
fo(Fzero)=1,130/2L, when L=the distance in feet between the two walls and 1,130 the speed of sound in feet per second. A similar resonance occurs at 2fo, 3fo, 4fo, ......etc, down through the spectrum. The fundamental frequency fo is CONSIDERED(emphasis added by me) a natural frequency of the space between the walls and it is ACCOMPANIED by a train of modes that also exibits resonances."
You will notice NO mention of STANDING WAVES in this exerpt. However, one is left with a distinct impression there is a difference between a "fundamental" frequency and its TRAIN of "modes"
Let me quote further in the same chapter on page 100.......
"MODE SUMMARY
There are three types of acoustical resonances(natuaral frequencies, standing waves, normal modes.
The axial modes are made up of two waves going in opposite directions,travelingparallel to one axis, and striking only two walls. ......"
This last statement pretty much sums up my understanding of the difference between "standing waves which do NOT move, and "modes" which as Mr. Everest points out, are TRAVELING. However, I still do not understand the difference between "fundamental frequency", and standing waves.
Steve, you know me. I have no interest in furthering personal conflict between parties who frequent these forums, nor do I have any motive for pointing out difference of "expressed definition" by these members other than my own distaste for "scientific" ambiguity. It is in this interest that I posted that link, as it furthers "netfact" discrepancy in basic acoustical discussions on the net. Furthermore, I detest authority "opinion" that uses credentials as a badge of truth, that does nothing more than confuse scientific fact, not that that is the case here. But you have to admit, that for such a downright basic acoustic phenomena explanation, it seems ludicrous to find such difference of expressed definition. I have yet to find a DIRECT explanation of the difference between modes and Standing waves, other than one travels, and one does not.
I for one am NOT an expert, and have ONLY these authorities to trust, and when that trust is destroyed, it FUCKING PISSES ME OFF!!
Nothing is more deserving of questioning than difference of these expressed definitions or connections.So, with all due respect, I am NOT going to apologize for ANYTHING here. This is an acoustics forum, and if I can't question these discrepancys here, fued or not, then this forum is NOT based on truth, only opinion.
I rest my case.fitZ
