27 May
2008
27 May
'08
8:41 a.m.
On Tue, May 27, 2008 at 12:23:57PM +0200, Atte André Jensen wrote:
Fons Adriaensen wrote:
It's not supposed to work in those conditions. What you need is
two speakers that you see in an angle of about 20 degrees (so
much closer than normal), and a distance of around 2 to 3 meters.
The 'sweet spot' is quite small. Two or more listeners should
be behind each other, not besides.
The required delay is very small, around 100 us.
If the delay roughly corresponds to the path
difference of one
ear to both speakers, and you do invert, then this is a primitive
form of crosstalk cancellation.
So the delay part is crucial and the result can be good?
I don't understand how long the delay should be (although I know how fast
sound travels and how far apart my ears are).
Supposed I'm 10 meters away from a PA (speakers 10 meters apart), what
should the delay be? What if I'm listening at home, 3 meters away from my
home stereo (speakers 3 meters apart)? What if I'm listening through headphones?
Bad idea ! Xtalk cancellation is used to *replace* headphones,
while allowing the listener to turn his/her head w.r.t. the
speakers. Allowing this makes the image much more 'real' than
with headphones.
Ciao,
--
FA
Laboratorio di Acustica ed Elettroacustica
Parma, Italia
Lascia la spina, cogli la rosa.