The Doppler shift for that horn would raise the pitch by about 60 Hz, assuming a 500 Hz tone, and the sign convention is positive for approach. But a film sound must feel true, not just be correct—a train at that speed in open country has a longer, mournful bend in pitch, not a sharp jump. I know because I once wasted a day matching a calculated shift to a scene, and the director said, "Brother, that sounds like a toy.
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