| as.dummies | Create matrix of dummy vectors from single factor | 
| Bark | Convert between frequency in Hz and in Bark | 
| bark2f | Convert between frequency in Hz and in Bark | 
| bracket | Add rectangular bracket to plot | 
| f2bark | Convert between frequency in Hz and in Bark | 
| f2mel | Convert between frequency in Hz and in mel units | 
| f2st | Convert between frequency in Hz and in semitones | 
| is.inrange | Check whether argument is within range | 
| mel | Convert between frequency in Hz and in mel units | 
| mel2f | Convert between frequency in Hz and in mel units | 
| semitone | Convert between frequency in Hz and in semitones | 
| st2f | Convert between frequency in Hz and in semitones | 
| talkers | Data set of talkers of Dutch from the Netherlands. |