Talkback for article: 271, March2003

Basic accoustics and signal processing for musicians

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From: Mathias <tirti(at)> [ date: 2003-04-02 ]
I liked the article very much. Great idea to make such an off topic article for the magazine
From: Lyle [ date: 2003-05-13 ]
Nice article; I learned a few things very easily that I had heard of before but didn't understand. Thanks!
From: Henri Cjhapelle <henri.chapelle(at)> [ date: 2003-07-25 ]
Thank you for this article,
ce qui se conçoit bien s'énnonce clairement,
the author is the king of vulgarisation, great job man!

From: JLVAT <jlvat(at)> [ date: 2003-08-27 ]
see the website
It deals with signal processing.
good reading

From: barn <arnaud.bardet-renexter(at)> [ date: 2003-10-21 ]
I have a very simple question :
We only have two ears. We can determinate with it, if a sound comes from front or rear.
Why can't we simulate this with only 2 speakers like headphones ?
Why 4 or more speakers are needed ?

Thanks for your answer.

From: ROLAND <rlefebvre(at)> [ date: 2003-11-24 ]
Your formula to calculate the frequencies is nice but too complicate for me. I prefer to use another one which is more understandable: between 2 octave you have 12 half tones and in one octave you have frequency multiplied by 2 . Consequenly between 2 half tones you have a ratio egal to square roote of 12 , that is 1.0595.
Example : Do at 32.7 Hz, x 1.0595=34.65 Hz
Example : mi at 41.2Hz x1.0595= 43.65 Hz that is fa
A good web site on this matter is
From: Ben TESS' <Ptitben60(at)> [ date: 2004-05-03 ]
Désolé de parler en français...
Ce site est vraiment très bien fait, très complet pour un niveau moyen et m'a beaucoup pour un exposé, et me motive encore plus à poursuivre mes études dans le son.

Merci beaucoup et à très vite sur le site...
From: tawfik shabaka <drtawfik1(at)> [ date: 2004-06-23 ]
i like this valiable information
and i appreciate youer efforts
From: charles thérésy <f.theresy(at)> [ date: 2006-01-19 ]
I'm looking for informations on the treatment of sound (voice , words) by COCHLEAR IMPLANTS. I'd like to understand how the processor switches a continuous information ( a sound) to a discontinuous information (a pulse). How is it chosen , how do filters work?
If you can answer me , I'd love to receive your mail at
Thank you

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