SOLIPSIUMAlpha
SOLIPSIUM Super resolution audio engine
Phone calls
Drop the call's recording here. Solipsium measures where its sound stops, its noise and its holes first, and says what it found.
Drop a call recording here
Solipsium checks it in your browser for clipping, hum and noise, without uploading it. It can then repair the first 20 seconds for you to hear, with no account.
WAV, MP3, M4A, MP4 and more, up to five minutes for the check.
After signing up, drop the same file into the editor to repair all of it.
Then drop the same file into the editor. Scans and short repairs are free.
Before the call
Laws on recording calls differ from place to place, and some need everyone on the call to agree. Check the rules where you and the other person are.
Where your phone records calls, its own app keeps the file. Share it from there to this device, as a file rather than a link.
A call recorded at one end hears the far side through the phone line, and the near side at full quality. If the other person records their own voice too, you get both sides clean.
A recording passed through a messaging app can come back smaller and duller than the phone saved it.
Fault by fault
The check in your browser names muffled or phone sound, background noise, mains hum, clipping and dropouts. The try repairs the first 20 seconds on Solipsium's server and lists a reason for each step.
A phone line cuts the sound off above about 4 kHz. When the recording stops under about 5.4 kHz and nothing else is found, AP-BWE's 8 kHz model predicts the treble from the sound below 4 kHz, which is kept as it was. The result reads: “Little sound was found above 4 kHz, like a phone line. The treble is rebuilt from the sound below it, which is kept as it was. What is added is inferred.”
With a steady noise floor as well, gentle cleanup runs first: “A phone line with a steady noise floor was found, so gentle cleanup runs first, then the treble is rebuilt from the sound below 4 kHz. What is added is inferred.”
A call that lost packets can leave holes of exact digital silence. Holes up to 100 ms with sudden edges are filled by continuing the voice's pitch from each side, and the fill is labelled an estimate: “Short holes of lost audio were found, so they are filled from nearby sound.” When the phone smoothed a loss over instead, there is no hole to fill.
A call app or a wideband call can reach past a phone line. Sound that stops between about 5.4 and 8.3 kHz is kept as it is, and the result can read: “The treble is thin, but real sound reaches above a phone line, so it is kept as it is. The treble rebuilder is used only on phone lines.” Sound that stops near 8 kHz, as in a file saved at 16 kHz, gets a rebuild of its own: “The recording seems to have been saved at 16 kHz, so nothing is left above 8 kHz. The treble is rebuilt from the sound below it, which is kept as it was. What is added is inferred.”
Questions
The rebuilt treble is an estimate from the sound below 4 kHz, and everything below 4 kHz is your recording as it was. A call whose sound stops between about 5.4 and 8.3 kHz gets no rebuild at all.
The repair does not balance two speakers. Normalize audio sets the whole file to one loudness, and a recording of each side, repaired on its own, keeps each voice at its own level.
No. Both sides stay in the one file. Speech cleanup lowers voices that sit behind the speaker, not the person you are talking to.
The rebuild needs sound that stops under about 5.4 kHz, with nothing else found or only steady noise. When clipping, holes or hum are found as well, those are repaired and the treble stays. With noise and other damage together, the try says speech cleanup is not run on narrow-band audio, because it measured worse.
No. It is predicted from the sound below it, and the result labels it inferred. Keep the original for anything that has to be exact.
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
For the phone line, the holes and the level.
When a phone line's treble is rebuilt, and when it is kept.
Short holes of exact silence, found and filled.
Get a voicemail off an iPhone or Android phone as a file.
Set a recording to one loudness target.
Every free tool on one page.
Make a free account and drop the same recording into the editor to repair all of it, up to 30 minutes at a time.
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