linuxaudio.org

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

quoted text
> 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.
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