Re[Openal] garding Doppler Effect

[Daniel PEACOCK]

The OpenAL1.1 Specification includes some information about Doppler (
http://connect.creativelabs.com/openal/Documentation/OpenAL%201.1%20Specification.htm#_Toc199835873
 ).

To use Doppler properly you must know how your units relate to real world
units.  This is because Doppler is modelling how the pitch of a sound
varies based on how fast the sound is travelling and whether it is moving
towards the Listener or moving away from it.

By default, units are assumed to be in meters (and velocities in meters per
second).   The AL_SPEED_OF_SOUND property therefore defaults to 343.3
(speed of sound travelling through the air in meters per second).
Assuming you are using meters for your units then all you need to do is
update each moving AL Source with a Velocity vector (note velocity is *not*
generated automatically based on changes in Source position) and if the
Listener is also moving you can also set a Listener Velocity parameter too.

If you are using Windows, and have the Creative OpenAL SDK, you can use the
included EFX10Show application to play with the Doppler related parameters
to see how things interact.

Dan
Creative Labs (UK) Ltd.

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Can anyone explain me the OpenAL Doppler effect and its usage??
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