Odp: Odp: [sdiy] About that spherical impulse generator...

[Glen]

At 05:26 PM 1/10/04 , harrybissell wrote:

There is one more requirement for any electrical discharge acoustic impulse
generator. Ideally, the acoustic impulse needs to be approximately 1/3 the
time duration of one sample period. Shorter is much better than longer in
this case.

If I calculated correctly, a sample rate of 44.1 kHz needs an acoustic
pulse of roughly 7.5 microseconds in length. A sample rate of 96 kHz would
need a pulse of roughly 3.5 microseconds in length. 

We need good control over the duration of the arc. Simply letting the
voltage rise across some electrodes till it arcs over, probably won't cut
it. I think we probably need some way to extinguish the arc at a
predictable time, other than only filling a capacitor with enough joules to
create an arc of a particular time length and letting the arc die on its own.


later,
Glen Berry