Why enhancement matters
Most transcription errors start with the recording: low volume, steady noise, or heavy hum. Improving the signal before speech-to-text often saves more time than post-editing.
A simple pre-processing checklist
- Noise reduction: on for fan/AC hiss
- Normalize: on to stabilize loudness
- Hum filter: use for 50/60Hz mains buzz
- Gain: increase carefully; too much can clip and hurt accuracy
Signs you pushed too far
- harsh “s” sounds
- metallic artifacts
- distorted peaks
Aim for clarity, not “loud at all costs”.
Summary
If you want a clean transcript and better translation, start by making speech easier to hear.