Shelving Filter Example

Original audio Full song "Rainbow Road" by Nanobii on SoundCloud

Modified audio

Difference equation of shelving filter:

$$y[n] = 1.9793 y[n-1] - 0.9801 y[n-2] + 1.0082 x[n] - 1.9784 x[n-1] + 0.9727 x[n-2]$$

Magnitude and Phase Response of Shelving Filter [0 - 3k Hz]

Spectrogram of Original Audio

Spectrogram of Modified Audio

Zoomed Spectrogram