The Doppler effect is a change in the frequency a listener hears when a sound source and listener move relative to each other. When a siren approaches, its waves reach the listener closer together and the pitch sounds higher; after it passes, the waves arrive farther apart and the pitch sounds lower. The same principle can help make a moving sound effect feel like it travels through a scene.

Build a pass-by with more than a volume fade

For a car, spacecraft or creature moving past the camera, start with a sound that suits the source. Then shape the movement across three cues:

• Level: raise the sound as it approaches and lower it after it passes.
• Pitch: create a controlled shift around the pass-by so the sound changes as the source crosses the listener’s position.
• Position: move the sound across the stereo field if the scene and playback format support that movement.

A single volume fade can sound like a sound that simply gets louder and quieter. The pitch movement is the distinctive Doppler cue. Adobe Audition’s Doppler Shifter lets an editor define a source path and simulate pitch and volume changes, but the effect should still match the apparent distance, speed and direction in the picture.

Keep it believable

Do not apply the same dramatic shift to every moving object. A distant vehicle may need a subtle change; a close, fast pass can justify a stronger one. Keep the effect short enough to follow the action, and check it on headphones and ordinary speakers. For games, test how the cue behaves as the player moves rather than treating it as a fixed one-time edit.

Use a suitable source recording or designed effect, then shape it to the scene. RouteNote Licensing has an SFX catalogue creators can search for production sounds; check the current licence terms for your video, game or client project.