Hi John, great answer, thanks..
John Denker wrote:
>
> We see that at the reference distance (r0), the signal is not
> attenuated at all. That's the defining property of the reference
>
So the reference distance is actually the distance from the microphone
to the sound emitting device when the sample was captured?
Here's what the docs (docs-mini/README.xmlsound) say, they don't quite
seem to match that. Or has all this just wooshed over my head and I
have to read your message again more carefully?
<reference-dist>
Set a reference distance of sound in meters. This is the
distance where the gain/volume will be halved. This can be
useful for limiting cockpit sounds to the cockpit.
<max-dist>
Set the maximum audible distance for the sound in meters.
This can be useful for limiting cockpit sounds to the cockpit.
> IMHO it would be a step in the wrong direction to ask aircraft designers
> to specify the reference distance. There's already a length-scale
>
But given that only the person who captured the sound sample knows the
reference for real, isn't it at least ideal to specify that reference?
Perhaps for our intents-and-purposes a reasonable guess could be made
based on the sound type, that is, it might be reasonable to assume that
if not specified the reference distance for an engine sound is probably
around 10 meters in most cases.
I can't imagine there would be a really big difference in saying the
reference was 10 meters or 20 meters. For things like flap, gear and
switches, the max-dist is probably more important than distance as these
things are really "internal" sounds, max-dist of a meter or two would
likely suffice.
---
James Sleeman
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