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In the Forum: Horn-Loaded Speakers
In the Thread: Evaluation of tractrix curves based on visual surface reflections.
Post Subject: Re: Further Explanation : Continuity in the Evolution of a CurvePosted by jessie.dazzle on: 6/25/2006
JLH and Romy,
Thank you both for your input; I will take it all into account.
Just a bit of clarification on the curve evaluation tool I used in the images: I understand that the wavefront, ideally starts out as a plane; the form it assumes evolving to become more spherical as it progresses along the horns axis.
The evaluation tool shows lines radiating perpendicular to the horns inner wall… they are not indicative of the form of the wavefront… because they are perpendicular to the wall of the horn, they are tangent to the theoretical wave at its perimeter (I could easily crank down the sensitivity of the tool so that the lines radiate only a short distance from the horn wall).
When looked at relative to each other, the RELATIVE LENGTH of the radiating lines generated by the evaluation tool, show how the curve is evolving relative to what comes before and after a chosen point of observation along the curve… in other words, it illustrates the QUALITY OF CONTINUITY IN THE EVOLUTION. A horn that evolves in a non-continuous manner is very easily identified. Ignoring the smaller imperfections, the larger 7mm adjustment (14mm if you take it as a diameter) was necessary to correct a curve that was not evolving in a completely continuous manner.
JLH, if I understand you correctly, an adjustment of this order of magnitude is unlikely to make an audible difference (?).
I very much like the suggestion to have a person with a familiar voice speak through the horn (and yes the city has a voice… in my case, mostly 2-stroke scooters!)… sometimes I try to isolate what makes my voice recognizable to others who know me… once you remove recognizable vocabulary and speech patterns, what permits distinction between a person’s voice and a simple series of tones? Is it the little details “hanging off the edges” accompanying those tones in a combination that is a sort of code read by others?
Once again, thank you both, I very much appreciate your thoughts.
By the way… I am very very curious about the continued story regarding the fundamentals channel…
Jd*
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