Dr. G. C. is a retired Medical Doctor as well Audio Engineer.
Dr G. C. also sent some pages from a book which describes [an equipment setup for] certain measurements on the human hearing.
My reaction is below.
ad 1/
Certainly we have a somewhat
improper translation here; the better term would have been
"Teilchengeschwindigkeit".
In the text below the table it is
made clear that it is about "wie schnell sich die Luftteiltchen [..]
bewegen.
A remark that this velocity is
different from the sound propagation velocity of
roughly 330 m/sec and which is invariant w.r.t. frequency and SPL would
have been appropriate.
ad 2/
It follows from [1] that the
particle velocity and not the propagation velocity is meant.
ad 3/
I had not the intension to
compress a complete overview of human hearing properties into
the article; the box on page 39 (in the German issue) was just
meant to give the most important background information.
You do have a point however.
Explicitely making clear that the Fletcher-Munson curves represent SPL
levels for equal subjective hearing experience would have been more
complete.
ad 4/
You are right, but from the
context it should be clear for the interrested readers what is meant
here.
ad 5/
I had the impression that the
Sone is used much less than the Phone. I admit that I did not dive very
deep into the science of psycho acoustics.
A discussion about a.o. Phone and
Sone can be found on http://www.sengpielaudio.com/calculatorSonephon.htm (Select
German or English)
ad 6/
I will make this information
available on my "Test Your Ears" website. It is really a nice example
of an old / historical setup, of which the
functionality can easily be implemented
using modern computer techniques.
The hardware presented
in the Elekor article can be used without modifications for
equal-loudness tests à la von Bekesy, only a software modality
has to be created which allows the "person under test" to increase or
decrease the volume of one of two test tones with the pushbuttons.
Dr. C, thank you for your
contribution.
Jan Breemer
Jan Breemer