All of the audio is searched.
The repair looks for holes through everything it is given: the first 20 seconds in the free try, the whole recording in the editor.
SOLIPSIUM Super resolution audio engine
Dropouts
Fill short dropouts in a recording.
Solipsium finds the holes of digital silence in a recording and fills the short ones from the sound on each side. See where yours drop out, then hear the first 20 seconds repaired.
Drop a recording with dropouts here
Solipsium checks it in your browser for dropouts and other damage, 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.
Your first 20 seconds
After signing up, drop the same file into the editor to repair all of it.
What Solipsium hears
Make a free account to repair the whole recording
Then drop the same file into the editor. Scans and short repairs are free.
How it works
How a dropout is found and filled.
A dropout is a stretch of exact digital silence with sound on both sides. A lost connection or a recorder's buffer gap can leave one. The check in your browser reports the digital silence it finds inside the audio, with its time and how many milliseconds it holds, in recordings up to five minutes long.
Holes up to 100 ms are filled.
Where the sound stops and starts suddenly, a hole of 100 ms or less is filled by continuing the voice's pitch cycle from each side and crossfading the two. The fill is labelled an estimate. When the try fills holes, its result reads: “Short holes of lost audio were found, so they are filled from nearby sound.”
Longer holes are left as they were.
A hole longer than 100 ms has lost too much to estimate. Silence that the sound fades into, as an edit or a noise gate makes, is left as well.
Prism-PLC in the editor.
A member can tick Experimental: Prism gap filling on a Suggested repair in the editor. Its note reads: “Solipsium Prism, our own model, shapes the filled dropouts band by band. It is built and measured for speech; on music it can do worse. Up to 10 minutes at a time, and it can take longer.”
Questions
About dropouts.
Can lost words come back?
No. The audio that was lost is not in the file, so the fill continues the sound from each side of the hole.
How long a gap can be filled?
Up to 100 ms, when the sound stops and starts suddenly at its edges. A hole must hold at least 10 ms of exact silence to be found.
My tape drops out. Will this fill it?
A tape dropout is usually a dip in level with some sound still in it. Only exact digital silence counts as a hole here, so a dip on a tape stays as it is. The cassette tape page says what the repair does with a tape transfer.
A call with packet loss?
A lost packet that left exact silence is filled like any other hole. A call can also cut off the treble. When a recording has both, the holes are filled and the treble is left as it was. The muffled audio page says when the treble is rebuilt.
What is Prism-PLC?
Prism is the family of models Solipsium trains itself, each for one kind of damage, and Prism-PLC is the one for dropouts. It runs in a member's editor when ticked. Solipsium's free try is built for speech, and it fills holes with gap filling alone.
Is my recording uploaded?
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
Related free tools.
More repairs for damaged recordings, each checked in your browser first.
- Fix distorted audio
See where a recording clips, then hear its flattened peaks partly raised back in the first 20 seconds.
- Clean up a cassette transfer
Check a captured tape for hum and hiss, then hear its first 20 seconds repaired.
- Clean up a meeting recording
Check a Zoom, Teams or Meet recording for noise and hum, then hear 20 seconds repaired.
- Remove crackle
Find dense ticks that run through the pauses, and hear each one redrawn from the sound around it.
- All free audio tools
Every free tool on one page.
The whole recording.
A free account's editor runs the same Suggested repair over recordings up to 30 minutes long.
Repair the whole recording
Free account, no card.