How Spatial Position Affects Piano Tuning
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- Опубліковано 11 жов 2024
- Over a given time window of measurement, each partial has 3 parameters: Frequency, Amplitude, Phase
A mic position affects all 3 parameters, and most importantly for tuning, the frequency is affected spatially by a spectral tilt induced by the soundboard resonances in the acoustic wave.
The position of a string motion sensor on the wire does not affect frequency accuracy, but only affects amplitude and phase.
The purpose of this experiment:
To show the spectrograms of the partial frequency drifts as observed from each pickup.
Those are top grade mics placed in good positions. Imagine how much wilder the deviations would be where ETD mics end up getting positioned for a tuning- which is to say for good line-of-sight between the tuner and the screen, not good audio. Not to mention whatever weird characteristics cheap built-in device mics have.