a- violin: a hiss noise at the attack, harmonic spectrum
b- flute: harmonic spectrum
c- piano: noise of the hammer attack, percussive sound and spectrum
not quite regular in its harmonics.
d- warm sound: few harmonics but regular distribution of the energy
from low to high
e- piercing sound: harmonic sound with a lot of intensity in the highs
f- Hollow sound: few harmonics in the mids
g- nasal sound: weak lows, intense mids, weak highs
h- non harmonic sound: like a non-tuned bell
I- square signal, odd harmonics: like a clarinet sound