Repetition pitch falls then rises, unlike the always-falling Doppler effect

Evidence

The effect is first a falling pitch, followed by a rising pitch after the jet passes. This effect is not like the Doppler effect: after the jet passes, the pitch would continue to fall if this were a Doppler phenomenon (see figure 7.31 or 7.32). If you look carefully, the whine of the jet engine is a faint trace in the upper part of the sonogram that does have this Doppler signature. You can hear the whine of the engine and the Doppler effect separately from the repetition pitch. — Eric J. Heller, Why You Hear What You Hear- An…, 2149

Categorization

• XREF: Contrasts with earlier Doppler-effect discussions (figures 7.31, 7.32), showing two distinct pitch mechanisms simultaneously in one sound.
• SHARE: For a physicist or audio engineer: the falling-then-rising repetition pitch signature of an overhead jet is distinct from its Doppler whine, both audible simultaneously.
• corroborated: 2 independent passages support this claim — Eric J. Heller, Why You Hear What You Hear- An…, 2149