
A command to filter each selected Sound object. The resulting Sound object has a higher spectral slope.
The reverse of Sound: Filter (deemphasis)....
The preemphasis factor α is computed as
α = exp (2 π F Δt) 
where Δt is the sampling period of the sound. The new sound y is then computed as:
y_{i} = x_{i}  α x_{i1} 
© ppgb, March 9, 2003