SOLIPSIUMAlpha

SOLIPSIUM Super resolution audio engine

Bluetooth microphones

Fix a recording made through a Bluetooth headset's microphone.

Drop the recording here. The check shows where its sound stops, which is what decides whether its treble can be rebuilt.

Drop a 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.

Choose a recording

Why it sounds muffled

The microphone switches the headset to a call mode.

When a Bluetooth headset's microphone is in use, most headsets switch to the hands-free mode made for phone calls, which carries much less of the voice.

Narrowband.

The oldest call mode carries sound up to about 4 kHz, like a phone line.

Wideband.

A newer call mode carries sound up to about 8 kHz, like a file saved at 16 kHz.

Next time.

Record with the computer's or phone's own microphone, or a wired one, and keep the headset for listening.

How it is rebuilt

Where the sound stops decides the repair.

The try repairs the first 20 seconds on Solipsium's server and lists a reason for each step.

Stops near 4 kHz.

With nothing else found, AP-BWE's 8 kHz model rebuilds the treble: “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 steady 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.”

Stops near 8 kHz.

With nothing else found, or only steady noise, AP-BWE's 16 kHz model rebuilds it: “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.”

Stops in between.

Sound that stops between about 5.4 and 8.3 kHz is kept as it is: “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.”

Questions

About Bluetooth microphones.

Is the rebuilt treble my real voice?

No. It is predicted from the sound below it, and the result labels it inferred. Below the cutoff you hear the recording as it was.

Why was nothing rebuilt?

The rebuild runs when nothing else is found, or only steady noise. When holes, clipping or hum are found too, those are repaired and the treble stays as it was.

How do I know where mine stops?

Drop it above; the check names where its sound stops. The audio spectrum check draws it as a picture.

Holes in the sound?

A Bluetooth link that dropped out can leave exact silence. Holes up to 100 ms are filled: “Short holes of lost audio were found, so they are filled from nearby sound.”

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.

For narrow sound.

The whole recording.

Make a free account and drop the same file into the editor to repair all of it, up to 30 minutes at a time.

Repair the whole recording

Free account, no card.