Digital Signal Processing Reference
In-Depth Information
Fig. 6.2
Exemplary speech wave form over time in ms: laughter (0.0-150 ms) followed by “I
take my mind off” taken from the Sensitive Artificial Listener (SAL) database (male speaker) and
selected LLDs [
43
]
Then, the audio signal is decomposed into frequency bands. These represent the
semi-tones which are defined for equal temperament as
2
i
/
12
f
i
=
f
0
·
f
0
=
f
(
A0
)
=
27
.
5Hz
,
(6.62)
