SOLIPSIUMAlpha
SOLIPSIUM Super resolution audio engine
Hiss and static
Drop a recording and Solipsium measures its hiss in your browser, with no sample of the noise needed. Then hear the first 20 seconds repaired.
Drop a hissy recording here
Solipsium checks it in your browser for noise, hum and clipping, without uploading it. It can then repair the first 20 seconds for you to hear, with no account.
WAV, MP3, M4A, video and more, up to five minutes.
After signing up, drop the same file into the editor to repair all of it.
Scans and short repairs are free.
How it works
Hiss is steady noise with a flat spectrum, the sound a tape or a preamp turned up high leaves under a voice. The check in your browser calls it background noise and says how many decibels below the loudest sound it sits. It lists the noise when it is loud next to the voice.
It runs on steady noise: quiet moments with a flat spectrum, a floor that holds steady and a level within 26 dB of the loud parts. DeepFilterNet3, a speech model, lowers parts of the recording's own spectrum and writes no new sound. The result reads: “A steady noise floor was found, so it is removed.”
When held musical tones sit under the noise, the repair uses Gentle cleanup instead: a spectral gain that lowers the noise by at most 6 dB, with no model, and the try's reason says: “Noise and held musical tones were found, so cleanup stays gentle.”
When hiss is too quiet to be labelled and nothing else is, a listening model scores the recording as it is and after Full-band speech cleanup, and the cleanup runs only when the model hears damage it clearly reduces. Its result reads: “Nothing was measured wrong, but a listening model heard damage that speech cleanup clearly reduced, so speech cleanup is used.”
Questions
No. The repair measures the noise floor in the recording's quietest moments, so you do not mark a stretch of room tone first.
On a recording that does not clip, hiss more than 26 dB under the loud parts is not labelled, and the listening model switches speech cleanup on only when it hears damage the cleanup clearly reduces. Otherwise the 20 seconds come back as they were, with this summary: “Nothing needed repairing: the measured repairs would not improve these 20 seconds, so they are left exactly as they were.” When the recording also clips, the clipping repair runs and no cleanup follows it. In the editor you can still run Full-band speech cleanup on it yourself.
It can. The editor's description of this cleanup reads: “Targets hiss in speech. Check quiet or distant voices; may remove music and ambience.” Switch between Original and Repaired as they play, on one clock, and keep the original if the voice sounds worse.
That is crackle, a different fault with its own repair: remove crackle from audio.
Solipsium's free try is built for speech. Full-band speech cleanup may remove music along with the hiss; where held musical tones are found under the noise, Gentle cleanup runs instead.
Not for the check, which runs in your browser. Pressing Repair the first 20 seconds sends those 20 seconds; when your browser could not open the file, or it runs over five minutes, the file itself goes to Solipsium's server, so the try is offered for it only up to 25 MB. Solipsium keeps only the first 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
Take out crackle, notch out hum, or clean up a tape you captured.
Check a recording for noise, hum and clipping, and hear its first 20 seconds repaired.
Find dense ticks that run through the pauses and hear each one redrawn from the sound around it.
Check a captured tape for hum, hiss, clipping and gaps, and hear 20 seconds repaired.
Find mains hum at 50 or 60 Hz and its harmonics, and hear it notched out.
Every free tool on one page.
With a free account, Suggested repair and the editor's speech cleanups work on all of it.
Free account, no card.