# Tag Info

1

A band sounds musically "out of tune" if the intervals between the notes played by different members are out of tune. Wikipedia's article about the Doppler effect states that all frequencies become multiplied by the same factor. This factor is approximately (1 - Δv/c), where c is the speed of sound and Δv is the rate of change in distance between the source ...

3

Going by just the title only, the answer is no. The Doppler shift is relative: it's a factor that is multiplied by the frequency of the tones, shifting them all up or down by the same relative amount. Since our hearing (both volume wise and tone height wise) is logarithmic, the only thing we'd notice is that the whole piece being played is transposed. But ...

10

Yes, this can definitely happen to a noticeable degree. Let's say there's a block of trumpets facing the audience, and the drill has alternate columns move forwards and backwards. If the step size is 6-to-5 (6 steps to go 5 yards) at a tempo of mm=160, this means that each player is moving at over 2 m/s. The combined relative speed difference of 4 m/s is ...

18

The pitch difference will be very slight, so some very good ears might notice, but it's likely that many of the instruments will be slightly out of tune to a greater degree than the doppler effect caused at marching speed. Based on the fomula from the Wikipedia page, and assuming a marching musician moves about .5 meters per second away from the listener, ...

2

A solid "it depends". The overtones are all sinoid signals, and sinoids stay sinoids given linear shift-invariant systems. Which most elements of sound transmission are. So if there is no significantly non-linear element after the sound-generating disharmonic element, the "unnatural" overtones are all there are. With a piano, this will be mostly the ...

0

So I found an answer to my question on this page - at least for the case of a piano the overtones are actually shifted (so there is no peek in the spectrum at the theoretical frequencies), specifically the measured frequencies of the partials become higher than the naively calculated frequency as you travel up the keys. The page linked provides a table and ...

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