IIR Speech Filter (Web)
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Help
Highpass Cutoff (Hz)
Lowpass Cutoff (Hz)
HP/LP Order
2
4
6
8
Notch Freq (Hz)
Notch Q
WAV Save Rate
Auto (native)
16k (speech)
Apply Notch
Show Phase Response
Enable IIR Filter
Lowpass Only
fs =
—
Start Mic
Stop Mic
Start Recording
Stop Recording
Save Recordings
Play Raw
Play Filtered
Ready. Click “Start Mic” and allow microphone access.
Spectrogram (filtered)
Waveform (filtered)
Magnitude Response (dB)
Phase Response (deg)
How to Use
Close
Click
Start Mic
and allow microphone access.
Put on
headphones
to prevent feedback loops.
Adjust
Highpass / Lowpass
and
Order
. Toggle
Apply Notch
for 50/60 Hz hum.
Use
Start Recording
→
Stop Recording
→
Save Recordings
to download WAV files (raw & filtered).
Pick a WAV save rate:
Auto
(native) or
16k
for speech.
Troubleshooting
No audio? Ensure HTTPS, allow mic permissions, and unmute the tab.
Cutoff warnings show when values exceed
Nyquist
(fs/2).
On iOS, tap Save again if the download didn’t appear.
Privacy:
All processing & recording happen in your browser; nothing is uploaded.