A Hierarchical Neuronal Model for Generation and Online Recognition of Birdsongs
Figure 3
Motor control signals and resulting power spectra generated by the model.
Left: The motor control signals are obtained by a linear combination of sine waves () with
(x-axis) and
(y-axis) where
in (A),
in (B) and
in (C). Right: These
and
dynamics are used in the syrinx equations (4) to obtain sound waves with the corresponding sonograms (time (sec) vs. frequency (kHz)).
and
control the amplitude and frequency of the sound waves, respectively. When
, no phonation is produced (mini-breaths, [44]). The fluctuations in the fundamental frequencies in the sonograms on the right can be traced by moving in counter clock-wise direction on the ellipse-like curves on the left starting from the blue arrows at
.