Doppler/synthesis effect in Android?

Question

In Android, the SoundPool.play API allows for playing sound effects. I'm wondering how I should alter the parameters to achieve a doppler effect:

public final int  play (
    int soundID,
    float leftVolume,
    float rightVolume,
    int priority,
    int loop,
    float rate)

You'll probably not be able to do anything like this with the SoundPool. You'll probably have to compute and write the raw PCM data yourself with an [AudioTrack](http://developer.android.com/reference/android/media/AudioTrack.html) — Tim, Nov 12 '12 at 21:48

score 1 · Accepted Answer · answered Nov 12 '12 at 23:06

Doppler frequency shift formula is: f = f0 * (c + vr) / (c + vs), where vs/vr -- speed of sender and receiver, and c is the speed of the sound (300m/s for air), you may use (c+vr)/(c+vs) as your rate parameter in play().

Here's additional info on Doppler shift, if you need it.

Doppler/synthesis effect in Android?

1 Answers1