Critical Band and Masking
when will one tone mask another?
(a) for small loudness (mf or below) another tone is
masked only if it's frequency is within the same
critical band.
Calculations: if the softer tone adds less than 0.5 dB
to the total intensity level it will not be heard.
(b) for loud sound such as ff:
tones of LOWER pitch are masked very little
tones of HIGHER pitch are masked (can't be heard)
importance for orchestration!
see Fig. 5, p. 102
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