AudioScope
Why Does a Passing Sound Drop in Pitch?
Listen to three tones at the same playback level. Which one sounds like it’s coming toward you?
Reveal the three pitches
- 0:03 · 440 Hz with the source at rest.
- 0:07 · About 467 Hz as it approaches.
- 0:10 · About 416 Hz as it recedes.
The source emits 440 Hz throughout. In this model it moves directly toward or away from a stationary listener at 20 m/s. Sound travels at 343 m/s. The animation exaggerates the spacing so the change is easier to see.
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