SOLIPSIUMAlpha
SOLIPSIUM Super resolution audio engine
Ham radio and SDR
Drop the receiver's recorded sound here. Solipsium measures where it stops, its noise and its static before it changes anything.
Drop a radio 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.
Recording
An SDR program can save two kinds of file. Only one of them is audio.
Record the sound the program plays, the voice after demodulation, as a WAV. That is the file to drop here.
A baseband or IQ recording holds the radio signal itself. It plays as noise until an SDR program demodulates it again.
A rig's line or headphone output into the computer's line in, recorded with any recording program, gives the same demodulated sound.
Fault by fault
The check in your browser names muffled sound, background noise, mains hum, clipping and dropouts. The try repairs the first 20 seconds on Solipsium's server.
Single sideband voice stops at about 3 kHz, under a phone line's edge. With nothing else found, the treble is rebuilt: “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 band noise as well: “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.”
Short ticks of static, each at most 2.5 ms, that keep coming at least four times a second in every five-second stretch, pauses included, count as crackle: “Clicks and crackle were found, in the pauses too, so each click is redrawn from the sound around it and the rest is untouched.”
Mains hum from a power supply is notched out in bands 3 Hz wide: “Mains hum was found, so it is notched out before any cleanup.”
A heterodyne is a steady tone at whatever pitch two signals make. It is not mains hum, so the hum notches leave it.
Questions
No. It is predicted from the sound below it and labelled inferred. Everything below the band's edge is the recording as it was.
Cleanup lowers steady noise around a voice it can find. A voice buried under the noise was not received clearly, and no repair can receive it again.
On narrow-band sound with noise and other damage together, the try runs no speech cleanup, because it measured worse than leaving the recording as it is, and says so beside the result.
Solipsium's free try is built for speech. A tone of Morse is neither speech nor mains hum, and it stays as recorded.
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 narrow sound and static.
When a narrow band's treble is rebuilt, and when it is kept.
Dense ticks redrawn from the sound around them.
See where a file's sound stops, as a picture.
Broadcasts kept on discs and tapes.
Every free tool on one page.
Make a free account and drop the same file into the editor to repair all of it, up to 30 minutes at a time.
Free account, no card.