Video Editing · Beginner level

Beginner level · Module 3: Audio Syncing and Sound · Lesson 2 of 3

Cleaning and Balancing Audio

Make voices clear and levels consistent.

In this lesson you will

  • Use meters to set levels
  • Reduce noise and fix common problems

Key concepts

audio metersclippingnoise reductionconsistent levels

The lesson

Watch the meters: speech should be strong and consistent, and nothing should hit the top (clipping), which causes distortion that cannot be fixed.

Noise reduction removes steady background noise such as fans or generators; use it gently to avoid robotic voices.

Balance levels between speakers and clips so viewers do not have to adjust the volume.

Step by step

  1. Check levels on the meters.
  2. Apply gentle noise reduction.
  3. Balance speakers.
  4. Listen on headphones and a phone speaker.
Troubleshooting tree

What's wrong with this audio?

A path from the problem you hear to the right fix.

Does the voice crackle or distort on loud words, with meters hitting the top?
  • Yes
    The recording clipped. Distortion cannot be fully removed: use a cleaner take or another microphone's recording, or re-record. Next time, set recording levels lower.
  • No
    Is there a steady background noise, such as a fan, generator or hum?
    • Yes
      Apply gentle noise reduction using a sample of the noise alone, plus a high-pass filter for low hum. Stop before the voice sounds robotic.
    • No
      Is the voice clear but much quieter or louder than other clips?
      • Yes
        Balance clip levels, add gentle compression and bring the whole mix to the loudness target.
      • No
        If the voice sounds distant or echoey, use closer microphone placement next time; reduce echo gently with a de-reverb tool where available.

Notes

Listen on headphones and on a phone speaker. Viewers forgive imperfect pictures far more readily than poor sound.

Practice activity

Clean and balance the interview audio.

Expected result: Clear, consistent dialogue with no clipping.

Check your understanding

  1. What is clipping?

    Show answer

    Audio too loud for the system, causing distortion.

  2. Why use noise reduction gently?

    Show answer

    Too much makes voices sound robotic.

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