A listener moving relative to a stationary source hears different pitches despite the source's vibration remaining constant, so perceived pitch carries no reliable information about source frequency.

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Carries reliable information(as used in epistemology (the study of knowledge)): Gives you accurate, trustworthy knowledge about something—in this case, whether what you hear directly tells you the truth about the actual sound waves.
Doppler effect(Acoustics; raised as an objection to distal accounts of sound perception): A shift in the frequency of sound heard by an observer who moves relative to the sound source, caused by compression of waves in the direction of movement and expansion of waves in the opposite direction, producing a dramatic frequency drop as hearer and source pass each other
Moving relative to(as used in physics and perception examples): Changing position compared to something else; in this case, the listener is moving while the sound source stays still.
Perceived pitch(as used in philosophy of perception): The pitch (how high or low a sound seems) that someone actually hears, which can differ from the actual vibration frequency of the sound source.

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