A command to filter each selected Sound object. The resulting Sound object has a higher spectral slope.
The reverse of Sound: Filter (de-emphasis)....
The pre-emphasis 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:
|yi = xi - α xi-1|
© ppgb, March 9, 2003