"Tal (Zapta)" wrote:
>
> > I'm planning to do all of the beam forming digitally as well. You
> > mentioned an
> > analog multiplexer. I had assumed that all of the ADC samples
> > need to be taken
> > simultaneously. How necessary is that?
>
> First, you get ignore the delay with some error, especially if it is very
> fast compare to your
> signal. Second, you can compensate for this delay when you form the beam
> using predefined delays. You definitely don't want to have an A/D for each
> hydrophone, this will be too painful.

I was going to start with just two or three microphones, just to keep things
simple, so one A/D each shouldn't be a big problem for now. If I use wide enough
memory it should help keep the bus frequencies down too.

Incidentally, I think I'm going to stick with air for now. I'll worry about
mixing water and electricity later.

I found some ultrasonic transucers at
http://www.mpja.com/product.asp?product=12941+UT
Any experience with them?

> I used to do these simulations long time ago in Basic using a teletype and a
> punch tape. This days I would consider using it in Excel.

I'll give the simulation idea a try, thanks.

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