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Filter Identification
Train your ears to recognize filter types and frequencies
Guide
Demo
Mode
i
Practice:
Direct control of all filter parameters.
Teaching:
Listen to a sequence of unfiltered then filtered audio.
Quiz:
Identify the hidden filter by ear.
Practice
Teaching
Quiz
Source
i
Audio source for the filter.
Pink Noise
has equal energy per octave, ideal for hearing filter shapes.
User Audio
lets you upload a file.
Multi-track
loads built-in stems with a mixer.
Sawtooth
is a synthesized tone with rich harmonic content.
Mute
Pink Noise
User Audio
Multi-track
Sawtooth
Gain
-24 dB
Drop audio file or click to upload
0:00 / 0:00
Source
Pink Noise
User Audio
Multi-track
Sawtooth
Listen
Loop
unfiltered
s
filtered
s
Source
Pink Noise
User Audio
Multi-track
Sawtooth
Drill
All Parameters
Filter Types
Frequencies
At
250 Hz
500 Hz
1 kHz
2 kHz
4 kHz
8 kHz
16 kHz
Filter
High-Pass
Low-Pass
Bandpass
High Shelf
Low Shelf
Peaking
Gain
Both
Boost only
Cut only
unfiltered
s
filtered
s
Score:
0/0
Streak:
0
Filter
i
Toggle the filter on or off (bypass). When bypassed, you hear the unfiltered source.
On
Spectrum
i
Show a real-time 1/6-octave spectrum analyser behind the filter curve. Bars show post-filter frequency content.
Off
Your Answer
Correct Answer
Type
i
The shape of the filter.
High/Low-Pass
remove frequencies above/below the cutoff.
Shelving
filters boost or cut above/below a frequency.
Peaking
boosts or cuts a band around the center frequency.
Bandpass
lets only a band through.
High-Pass
Low-Pass
Bandpass
High Shelf
Low Shelf
Peaking
Freq
i
Center or cutoff frequency of the filter. The vowel hints show what a narrow boost at each frequency sounds like in pink noise.
250 Hz
U "food"
500 Hz
O "no"
1 kHz
AH "aha"
2 kHz
EH "let"
4 kHz
EE "bee"
8 kHz
S "sam"
16 kHz
TS "cats"
Gain
i
How much the filter boosts or cuts, in decibels.
-12 dB
-6 dB
-3 dB
+3 dB
+6 dB
+12 dB
Shape
i
For high/low-pass: steepness of the slope (12, 24, or 48 dB/octave).
For peaking: bandwidth in octaves.
For shelf: slope parameter S.
12 dB/oct
24 dB/oct
48 dB/oct
½ oct
1 oct
2 oct
3 oct
Gentle
Standard
Steep
Resonant
Submit Answer
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