Bandpass Noise Filtering

Shape noise frequency content with precision bandpass filters

Pink noise filtered to 200-4000 Hz

What is Bandpass Filtering?

A bandpass filter allows only frequencies within a specified range to pass through, removing frequencies above and below the cutoff points.

This is useful for focusing noise on specific frequency ranges, such as bass-only noise for masking low-frequency disturbances.

Frequencies between Fmin and Fmax pass through, others are attenuated

Filter Controls

The filter panel appears when a noise waveform is selected:

Filter Toggle: Turn the bandpass filter on or off
Low Cut (Fmin): The high-pass cutoff frequency (20-20000 Hz)
High Cut (Fmax): The low-pass cutoff frequency (20-20000 Hz)
Filter Slope: How sharply the filter cuts (12, 24, or 36 dB/octave)

Noise Types Only: The bandpass filter is only available for noise waveforms (white, pink, brown, blue, violet, grey). It has no effect on tonal waveforms.

Filter Slopes Explained

The slope determines how sharply frequencies are attenuated beyond the cutoff:

Steeper slopes provide sharper frequency cutoff

Filter Slope	Rolloff	Character
12 dB/oct	Gentle	Gradual transition, some frequencies leak through
24 dB/oct	Medium	Good balance of sharpness and smoothness
36 dB/oct	Steep	Sharp cutoff, more precise frequency isolation

Applications

Focus Noise

Filter to speech frequencies (100-1000 Hz) to mask distracting conversations.

Try Focus Noise

Bass Testing

Filter noise to bass frequencies (80-250 Hz) to test subwoofer response.

Try Bass Test

Low-Freq Masking

Brown noise filtered to 50-500 Hz masks traffic rumble and HVAC noise.

Try Masking Noise

URL Parameters

Share filter settings via URL:

filt=1 — Enable bandpass filter
fmin — Low cut frequency in Hz
fmax — High cut frequency in Hz
fslope — Filter slope (12, 24, or 36)

Example: #wave=pinknoise&filt=1&fmin=200&fmax=4000

Open Filtered Noise