AW: Sonar sound

[Matthew S. Padden]

Hi..

>
>	>Try white noise with a piano-style amplitude decay (maybe a bit
>faster), run 
>	>through a lowpass filter that is _right_ on the edge of
>resonance. Adjust the 
>	>filter cutoff to get the deisred pitch of the 'ping'. Add a
>touch of reverb, 
>	>and you're away!
>
>... and don't forget the Leslie cabinet, if it's the "Echoes" (Meddle)
>effect you're after.
>

Now I think about it, there are an awful lot of variations on the sonar 
effect, ranging from what I described above to the much more piercing sounds, 
such as are in the film 'Red October', when the US and Russian subs are 
communicating by means of 'single pings only'. That sound is much more 
powerful, a bit like a metal sheet being plucked as well as the resonant ping.

	I did hear once of a Royal Navy experiment with sonar at super-high-power, 
super-low-frequency levels. The tests were performed about 30 miles off-shore, 
and sailors standing on deck could hear the reflections coming off the cliffs 
30 miles away!

Hmm, aquatic synthesisers....
--
Matthew S. Padden
Computer Music Research Group
Room M2/08, Music Dept.
Huddersfield University
Queensgate
Huddersfield
England HD1 3DH
p: +44 1484 422288 x2402
f: +44 1484 472656
e: mattp at mindless.com
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