19 Sep
2010
19 Sep
'10
5:01 p.m.
On Sun, Sep 19, 2010 at 06:43:00PM +0800, Simon Wise wrote:
I was collaborating with audio engineer a few years
ago who has been
setting up quite elaborate arrays of speakers arranged to direct
sound in particular directions, they have done fit-outs in the local
state parliament chamber, and actually achieved nice clear
announcements confined to the appropriate platform in a train
station with 25 platforms. A nice system, from reasonably priced
components.
What makes this sort of thing expensive is the amount of equipment
and the installation costs - lots of amps and wiring are required
if you really want to control each speaker separately. What is
needed to make this practical is boxes with a large number of
speakers, amplifiers and some DSP built-in, and just a single
connection (optical MADI or network) for the signals.
Train station platforms are among the nightmare places of any
acoustics engineer: difficult shape, either open air or very
reverberant halls, variable and high ambient noise - all of
it conspires against you...
Ciao,
--
FA
There are three of them, and Alleline.