Call Optimizer
Boosts the human voice in phone calls, radio recordings and other low-quality audio. Cuts background noise, makes speech more intelligible.
What it does
Use this to make call-centre recordings easier to listen to, recover speech from old phone calls, or sharpen a field recording where the speaker is hard to hear. Supports MP3, WAV and telephony codecs (GSM, AMR).
How to use
- Drag the call recordings into the list.
- Set the Enhancement Level (1-100, default 80).
- Pick an Optimization Profile: Phone, Radio or Crystal Clarity.
- Click Run.
You get one enhanced audio file per input.
Optimization profiles
| Profile | What for |
|---|---|
| Phone (300Hz-3400Hz) | Classic phone calls, call-centre recordings. |
| Radio / LMR | Police/fire radio recordings, bad-comm environments. |
| Crystal Clarity | Highest quality target, the cleanest possible sound. |
Enhancement level
- Low (20-40): Gentle, stays close to the original.
- Medium (60-80): Recommended, balanced result.
- High (90-100): Aggressive, the voice may sound a bit robotic but maximally intelligible.
Examples
Polish call-centre recordings for review: Add the recordings, Phone profile, Level 80, run.
Recover speech from an old radio recording: Add the radio file, Radio profile, Level 90, run.
Sharpen the speaker on a meeting recording: Add the file, Crystal Clarity, Level 70, run.
Customer-complaint intelligibility: Add every call, Phone profile, Level 80, run.
Watch out
- This does not bring back lost audio, it only clarifies what is there.
- Very high level may sound metallic or robotic.
- Do not use on files with music or ambience, this is tuned for speech only.
- Very short clips (under 3 seconds) may give inconsistent results.
- The Phone profile cuts frequencies outside the human voice band, so it is unsuitable for music.
License
Free tier has a monthly optimisation cap. Office plan removes it.