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. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
