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Audio Doppler Shift
Estimate the received tone and pitch shift for a moving sound source and listener.
Source frequency (Hz): 20–20000; Source velocity toward listener (m/s): -100–100; Listener velocity toward source (m/s): -100–100
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Audio Doppler Shift
Source frequency (Hz): 1000 Source velocity toward listener (m/s): 0 Listener velocity toward source (m/s): 0
- Received frequency (Hz)
- 1000.000000
- Pitch shift (semitones)
- 0.000000
Assumes collinear, constant motion through still air at 20 °C, with sound speed c = 343 m/s. Positive source and listener velocities each mean approaching; negative means receding, relative to the air. Received frequency = f × (343 + listener velocity) / (343 − source velocity). Pitch shift = 12 × log2(received / source frequency). This is an instantaneous sound-design estimate, not a full pass-by simulation: it excludes changing angles, wind, acceleration, level, propagation delay and supersonic motion. A shifted tone can exceed the audible range.
Methodology
How it works
Assumes collinear, constant motion through still air at 20 °C, with sound speed c = 343 m/s. Positive source and listener velocities each mean approaching; negative means receding, relative to the air. Received frequency = f × (343 + listener velocity) / (343 − source velocity). Pitch shift = 12 × log2(received / source frequency). This is an instantaneous sound-design estimate, not a full pass-by simulation: it excludes changing angles, wind, acceleration, level, propagation delay and supersonic motion. A shifted tone can exceed the audible range.
Method and assumptions documented by Techrider.live
2026-11-05
Frequently asked questions
Can I enter the relative speed once?
No. Source and listener motion affect wavelength and encounter rate differently. Enter both velocities relative to the still air; equal relative speeds need not produce equal shifts.