User Manual
Table Of Contents
- 1: INTRODUCTION
- Intended Audience for this Guide
- About the 2014 Edition
- Additional Resources
- About iZotope
- 2: WHAT IS AUDIO REPAIR AND RESTORATION?
- 3: AUDIO REPAIR AND RESTORATION BASICS
- 4: Understanding Spectrograms / Identifying Audio Problems
- 5: WHAT IS RX 4?
- 6: DENOISING
- 7: TIPS AND TRICKS FOR EDITING DIALOGUE
- 8: BROADBAND NOISE REDUCTION
- 9: REMOVING INTERMITTENT NOISES AND GAPS
- 10: REMOVING CLICKS AND POPS
- 11: REMOVING CLIPPING
- 12: REMOVING REVERB
- 13: EXPORTING AND DELIVERING AUDIO
- Exporting and Delivering Audio in RX 4
- 14: SUMMARY
- 15: ABOUT THE AUTHORS
- APPENDIX A: GETTING SET UP TO REPAIR AND RESTORE AUDIO
- APPENDIX B: GENERAL RX 4 TOOLS
- Appendix C: REPAIRING THE INCLUDED AUDIO FILES
- Example 1: Removing Broadband Noise from a Concert Recording
- Example 2: Restoring an Historical Speech: Making Voice More Intelligible
- Example 3: Cleaning up a Phone Interview with Declick and Spectral Repair
- Example 4: Removing Clicks and Pops from a Concert on Record
- Example 5: Removing Clipping from a Phone Interview
- Example 6: Removing Guitar String Squeaks with Spectral Repair
- Appendix D: Tips from the Pros
5
AUDIO REPAIR
AND ENHANCEMENT
1: INTRODUCTION
In today’s world, audio and video recordings can be made by almost anyone. From smartphones to sophis-
ticated studios and sound stages, large amounts of media content are created daily. And as our world
becomes increasingly and audibly congested, the rate of ruined recordings is rising in tandem. Human
error, unexpected electrical or mechanical interference, and unwelcome intrusions from aircraft, cell
phones, pets, people, and Mother Nature regularly impact even the most seasoned professional. Many
times, it just isn’t possible to record that “perfect take” over again, particularly when editing coverage of a
live event, or working to meet budgets and deadlines.
Whether you’re a professional or just getting started, you’ve probably ran into dicult audio situations like
those mentioned above, and wished you could correct what seemed like an impossible dilemma. We hope
this guide will help you understand the basics (and beyond) of audio repair and restoration and enable you
to fix previously unusable audio.
INTENDED AUDIENCE FOR THIS GUIDE
If you don’t know anything about audio repair and restoration, this guide is a great place to start. It will help
you develop practical and eective methods to remove noise and fix audio problems.
Sure, we think you should use iZotope RX® 4 (www.izotope.com/rx) to repair and/or restore your audio. But
we’ve learned so much from the audio community throughout the past 10+ years that we’re happy to give
something back in return: a guide that’s useful for anyone that wants to learn more about audio repair and
restoration. As a result, this guide can be freely copied or distributed for non-commercial purposes.
If you own RX 4 but don’t fully understand audio repair and restoration, this guide will help you better
understand the powerful tools at your disposal. Each chapter demonstrates many useful concepts that you
can apply to your next piece of problematic audio.
If you own RX 4 and already know the basics of audio repair and restoration, this guide will show you new
tricks and techniques that are possible in RX 4’s modules.
For the most comprehensive learning experience, download a free 10-day trial of RX 4 at
www.izotope.com/rx.