Audio Class: The Tools

Limiting, Compression & Expansion

• Limiting

  • Limits high level excursions
  • Makes up for uncontrolled or sloppy level control
  • Found on most camcorders & VCRs
  • Avoid limiting music, especially on camcorders
  • Dolby is frequency-dependent limiting

• Compression

  • Raises low levels and cuts high levels
  • Fits wide dynamic range program into limited channel

• Expansion

  • Expands (de-compresses) compressed audio
  • Usually symmetrical (used with matching compressor) like Dolby or DBX.

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Audio Class © 1993 Richard Crowley