A command to filter each selected Sound object. The resulting Sound object has a higher spectral slope.

The reverse of Sound: Filter (de-emphasis)....

Setting

From frequency (Hz)

the frequency F above which the spectral slope will increase by 6 dB/octave.

Algorithm

The pre-emphasis factor α is computed as

where Δt is the sampling period of the sound. The new sound y is then computed as:

Links to this page

• Filtering
• Sound: Pre-emphasize (in-place)...