 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| • |
The vocal tract
has about four resonant frequencies which are called
|
|
formants.
|
|
|
|
– |
We
can vary the frequencies of the four formants.
|
|
|
| • |
How do we hear
the formants?
|
|
|
|
– |
The
larynx makes clicks. We hear the dying resonances of each
|
|
|
click.
|
|
|
|
– |
The
click rate is the pitch of the voice. It is independent of the
|
|
|
formants.
The relative energies in each harmonic of the pitch
|
|
|
define
the envelope of a formant.
|
|
|
| • |
Each vowel
corresponds to a different region in the plane defined by
|
|
|
the first two
formants, F1 and F2. Diphthongs are different.
|
|