Formant Frequencies
Formant Frequencies (f1-4)
Formants are spectral peaks in the sound spectrum that are typically distributed in bands across different frequencies1. OpenDBM outputs values for the first four formants (f1-4), with N in the variable names in the tables below referring to the formant number.
Raw Variables
| Variable | Description |
|---|---|
aco_fmN | Formant frequency. Frame-wise formant frequency (fN) measurements, with N being 1, 2, 3, or 4, referring to the 1st, 2nd, 3rd, or 4th formant respectively. |
Derived Variables
| Variable | Description |
|---|---|
aco_fmN_mean | Formant frequency mean. Mean of the Nth formant (fN) across all audio frames. |
aco_fmN_std | Formant frequency standard deviation. Standard deviation of the Nth formant (fN) across all audio frames. |