SOLIPSIUMAlpha

SOLIPSIUM Super resolution audio engine

Podcast audio

Clean up a podcast recording before you edit it.

Solipsium measures the hum, clipped peaks and room noise in a podcast track before it changes anything, and lists what it found. Then you can hear the first 20 seconds repaired.

Drop a podcast track 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, video and more, up to five minutes.

Choose a recording

How it works

What it looks for in a podcast track.

The check in your browser names what it hears and when. The repair of the first 20 seconds measures again on Solipsium's server, repairs clipped peaks and hum before any cleanup, and lists the reasons for what it does. Solipsium's free try is built for speech.

Hum from an interface or mixer.

A ground loop between a USB interface, a mixer and a computer adds hum at the mains frequency, 50 or 60 Hz, and its multiples. Solipsium counts a line as hum when it stands 10 dB over its neighbours, averaged over up to 30 one-second windows. It notches the first four harmonics with filters 3 Hz wide, and higher ones up to the 24th where they stand 8 dB out, then puts the untouched recording back wherever the notches removed almost nothing. The result reads: "Mains hum was found, so it is notched out before any cleanup."

Clipped peaks from a hot mic.

When a guest leans in or laughs, peaks hit the converter's limit and are cut flat. The repair calls a track clipped when two samples in a thousand sit at that limit. Flat tops up to 10 ms long are partly raised back from the undamaged samples around them, by no more than 2.3 dB over the clip level. A top that is unsafe to raise is left exactly as it was. If the raised peaks would come too close to full scale, the repair is turned down and limited around them.

Room noise.

A guest's fan or air conditioning leaves a steady floor under the voice. Solipsium labels it when the quiet moments have a flat spectrum, hold steady within 7.5 dB and sit 26 dB or less under the loudest parts. Full-band speech cleanup then lowers the floor with a mask on the recording's own spectrum: "A steady noise floor was found, so it is removed."

Voices behind the speaker.

Chatter from a café or the next room gets Full-band speech cleanup too. When the repair finds it, the result reads: "Other voices seem to sit behind the speaker, so speech cleanup is used."

Order of work

Repair each voice track, then mix.

The repair is built for speech, so run it on each voice track before the music and the mix, in a free account's editor, which repairs whole tracks.

  1. Repair each voice track on its own.

    The editor takes one audio track per project, mono or stereo, up to 30 minutes and 1 GB. Export each host's track from your recorder or editor and repair it in its own project.

  2. Add music after the repair.

    Full-band cleanup is made for voices. The editor's note on it reads: "Targets hiss in speech. Check quiet or distant voices; may remove music and ambience." Bring in the music bed once the voices are done.

  3. Export at -16 LUFS.

    In the editor, the Voice / podcast setting turns the whole export to -16 LUFS with one gain, so the dynamics stay as they are, and keeps the WAV's true peak under -1 dB. Loud peaks can leave a quiet mix below the target.

  4. Measure the finished episode.

    The loudness checker reads integrated loudness and true peak in your browser and gives a verdict for Apple Podcasts and Spotify.

Questions

About podcast audio.

Should I clean up before or after editing?

Clean each voice track before you add music or mix. You can cut first: the repair measures whatever track it is given. Full-band cleanup may remove music, so the music bed goes in afterwards.

Can it remove hum from my audio interface?

Yes, when it is mains hum: a steady tone at 50 or 60 Hz and its multiples, which is what a ground loop makes. Drop the track above. The check names mains hum when it finds it, and the 20-second try lets you hear the result before you repair the whole episode.

Two hosts on one track?

Speech cleanup keeps the voice's full range and lowers what surrounds it. If the try's result says other voices seem to sit behind the speaker, switch between Original and Repaired on the same words and listen for the quieter host. A separate track for each host keeps them apart.

How loud should the episode be?

The repair does not set loudness; it only keeps peaks under full scale. Set the level when you export: the editor's Voice / podcast setting targets -16 LUFS, and it also offers -14 and -23 LUFS. Then measure the file with the loudness checker for its Apple Podcasts and Spotify verdicts.

What about a two-hour episode?

The check in your browser hears up to five minutes, and the editor imports up to 30 minutes per file. Split a long episode into parts first with the audio splitter, then repair each part.

Is my track 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.

Measure the episode, set its level, or split it into parts.

The whole episode.

After signing up, drop each voice track into the editor and repair it from start to end.

Repair the whole recording

Free account, no card.