From: "John Hartog" <>
> Thanks Walt, I read the paper at the link you provided. It is always
> important to have an understanding of the groundwork laid
> before - whatever field you are in. Unfortunately that paper does
> not do much to explain the reasoning behind the Jecklin design.
> The disk's dimensions are given, 300mm diameter and mics
> spaced 165mm, but how did Jecklin get those numbers? Did he
> measure his own perfectly symmetrical head? And why a
> circular disk instead of a square or an amoeboid for that matter?
> Also, there are many typing mistakes in the document. The
> Jecklin disk itself may be a simple and functional design but this
> "typing in" of Jecklin's original text is certainly crude.
> -John hartog
You should note that the original paper was not in english. This was
both translated and typed in. From some of the odd sentence construction
I'd say the person who did it was probably more familiar with the
original language than english. I had no problem understanding what was
there. Maybe because I've known a fair number of people from that part
of the world and they made the same odd sentences.
Remember, Jecklin in this paper was speaking to folks who understood the
physics very well. He did omit explaining things that those people
already knew well. It only took a few words to give the reason for the
165mm if you already were a expert. It happens to be fairly close to
standard head size, but that may just be coincidence. He does not seem
to refer to it as head size.
There is some more of the reasoning to be found in "The New Stereo
Soundbook" if you are unfamiliar with that stuff. It does not assume you
are a expert.
As far as trying other shapes, I don't think I've ever seen any info
from anyone who has systematically tried various shapes using the
Jecklin disk as a starting point. You might could even be doing a first
if you did the experiments and wrote a paper for publication. My own
feeling is it's not a critical issue, but you never know.
Walt
________________________________________________________________________
________________________________________________________________________
|