SOLIPSIUM Super-resolution audio engine
Clean up audio
Clean up audio, one problem at a time.
Drop a recording and Solipsium lists what it hears, then cleans up 20 seconds for you to compare.
Drop a recording to clean up
Solipsium checks it in your browser for clipping, hum and noise, without uploading it. It can then repair 20 seconds for you to hear, with no account.
WAV, MP3, M4A, MP4 and more, up to five minutes for the check.
What Solipsium hears
Solipsium can still try a repair on 20 seconds.
Your 20 seconds, before and after
Drop the same file in the editor with a free account.
What it is
An audio cleaner that listens first.
Solipsium repairs noisy or damaged recordings. It measures the recording first, then runs the steps planned for what it found, in a set order.
The check lists what it hears.
It names clipping, dropouts, mains hum, background noise, muffled sound and a very quiet recording, and says when it hears each one. Your file is not uploaded for it.
The try cleans up 20 seconds.
Ask for the try. Solipsium's server runs the plan on them and lists a reason for each step. Then switch between Original and Repaired as they play.
The editor cleans up the rest.
With a free account, drop the same file into the editor. It takes up to 30 minutes and 1 GB at a time and keeps your original.
How it is repaired
The order it cleans in.
Solipsium repairs the damage first, then runs at most one cleanup. Each step runs only when the recording calls for it.
Dropouts are filled.
Holes of digital silence up to 100 ms, with sudden edges, are filled from the sound on each side and labelled an estimate.
Clipped peaks are partly raised back.
Flat tops up to 10 ms long are partly raised back from the undamaged samples around them, never more than 2.3 dB over the clip level.
Crackle is redrawn.
Ticks that keep coming through the pauses are redrawn from the sound on both sides. This step is skipped on a recording that clips, since raised peaks look like clicks to it.
Hum is notched out.
Solipsium notches out mains hum at 50 or 60 Hz and its harmonics, in bands a few hertz wide. Hum that comes and goes is notched only where it is.
At most one cleanup runs.
Steady noise and voices behind the speaker get Full-band speech cleanup, noise under held musical tones gets Gentle cleanup, and echo found on its own gets echo reduction. The try names its choice, as in “Other voices seem to sit behind the speaker, so speech cleanup is used.”
Low rumble comes last.
When no speech cleanup ran, steady rumble below 300 Hz is turned down after every other step, with one fixed curve for the whole recording.
Questions
When it does less.
Does it clean up music?
Less than speech. Solipsium's free try is built for speech. Where it hears music and no loud noise under the voice, it leaves out speech cleanup and echo reduction, which would remove the music. If it still hears music with the hum notched out, it leaves out the hum notches too, since they would cut into the notes. Crackle in a song can go unlabelled, because the label needs quiet moments at least 25 dB under the loud parts.
Why was my recording left as it was?
When none of the measured repairs would improve the 20 seconds, the try returns them unchanged and says so. In the editor you can still pick a passage and a tool yourself.
Can it clean up a recording over 30 minutes?
In parts. The check reads up to five minutes, and the editor imports up to 30 minutes and 1 GB at a time with a free account. Cut a longer recording with the audio splitter and clean up each part.
Is my recording uploaded?
Not for the check, which runs in your browser. Pressing Repair the first 20 seconds sends those 20 seconds. If your browser could not open the file, or it runs over five minutes, the whole file goes to Solipsium's server instead, so the try is offered for such a file only up to 25 MB. Solipsium keeps only those 20 seconds and deletes them within an hour. If you are signed in, a file you drop or choose is uploaded to your account and opens in the editor instead. The privacy notice has the rest.
Free audio tools
Related free tools.
Each step has a page of its own.
- Remove background noise
Noise, hum and clipping, checked together.
- Remove hum and buzz
Mains hum at 50 or 60 Hz.
- Remove crackle
Ticks through the pauses, redrawn.
- Remove rumble and wind noise
Low rumble turned down below 300 Hz.
- All free audio tools
Every free tool on one page.
Want Solipsium to do the whole recording the same way?
The editor runs the same plan on the whole file, up to 30 minutes at a time.
Free for a limited time, whole recordings included. No card.
Free account, no card.