SOLIPSIUMAlpha
SOLIPSIUM Super-resolution audio engine
Audio enhancer
Drop a recording and Solipsium names what is wrong with it, then repairs 20 seconds for you to compare.
Drop a voice recording here
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.
Solipsium can still try a repair on 20 seconds.
Drop the same file in the editor with a free account.
What it is
Solipsium repairs noisy or damaged recordings. It names each problem it hears, then runs the repair that scored highest on that problem in our speech benchmark.
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.
Ask for the try, and Solipsium's server runs Suggested repair on them. Then switch between Original and Repaired as they play. You need no account.
With a free account, drop the same file into the editor. It takes up to 30 minutes and 1 GB at a time, keeps your original and lists every change with its time.
How it is repaired
Suggested repair runs in a set order: dropouts, clipping and hum first, then at most one cleanup, and low rumble last.
When a steady noise floor sits within 26 dB of the voice, Solipsium runs Full-band speech cleanup. That speech model keeps the voice's full range and lowers what surrounds it. The try lists the reason: “A steady noise floor was found, so it is removed.”
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.
Holes of digital silence up to 100 ms are filled from the sound on each side and labelled an estimate. Flattened peaks are partly raised back from the undamaged samples around them.
When no measured repair would improve the 20 seconds, the try returns them as they were and says so.
Questions
No. A recording with nothing measured wrong comes back as it was. 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.
Solipsium rebuilds the treble in two cases. One is speech that stops under about 5.4 kHz, as a phone line does. The other is sound that stops between about 8.3 and 11 kHz, as a file saved at 16 kHz does. Either rebuild runs only when nothing else was found, or only steady noise, and what it adds is labelled inferred. In the editor, a free account can run AudioSR on a passage of up to 60 seconds.
Solipsium reduces echo unless steady noise, other voices, music or muffled sound sits beside it. Hum, clipping and dropouts are repaired first and do not stop it. On a long recording it works about 20 seconds at a time.
Not for the check or the 20-second try. Repairing the whole recording and keeping the result takes a free account.
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
Use these for one problem at a time, or for the sound of a video.
Noise, hum and clipping, checked together.
The same repair for the sound of a video.
When the treble of a phone line is rebuilt.
Raise a quiet recording in your browser.
Every free tool on one page.
The editor runs the same Suggested repair 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.