Ideal Filter Demo — Interactive Audio

Song Select

Loading audio…

0:00 ORIGINAL 0:30

Cutoff Frequencies

Cutoff f_c

Upper f_c2

Low-Pass Filter

H(f) = 1 for |f| ≤ f_c, else 0

Passes all frequencies below the cutoff. Removes high-frequency content, creating a "muffled" or bass-heavy sound.

Drag the handles to adjust cutoff frequencies

Filter Response H(f)

Original Spectrum

Filtered Spectrum

Original Signal x(t) 30 ms window

Filtered Signal y(t) 30 ms window

Original vs Filtered Spectrum One-sided magnitude (dB)

Filter Frequency Response H(f) Ideal brick-wall