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
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AUDIO REPAIR
AND ENHANCEMENT
15: ABOUT THE AUTHORS
In addition to the hard work of iZotope’s development, QA, and content development teams, we also wish
to extend our thanks to Nat Johnson whose writing, restoration expertise, and audio examples contributed
greatly to the original version of this guide published in 2008.
Nat Johnson
Nat Johnson started a career in radio broadcasting and sound recording after joining the Concert Network
as an announcer and music programmer. During this period, he was oered the opportunity to record a
season of live performances for Sarah Caldwell’s Opera Company of Boston. Soon after, Nat joined the
sta at WGBH-TV and radio and was assigned the unique triple-role of announcer, producer, and audio
engineer. He became involved with the recording and mixing of multi-track recordings, including broad-
casts by the Boston Symphony and Pops Orchestras.
While in England, producing an album for WGBH at the BBC Studios in London, Nat received an invitation
from Ray Dolby to tour Dolby Laboratories in Clapham. Later, as a producer for RCA Records, he continued
his associations with Dolby in New York, developing Pro Logic surround remastering projects for CD. In
1999, while supervising classical and film music reissues at BMG/RCA, Johnson initiated a unique audio-
phile series of high-end CD’s employing Weiss 24/96 A/D converters and Sonic Solutions’ High Density
editing system. In 2000, Nat was nominated for a Grammy as the producer of the 94-CD Rubinstein
Collection for BMG/RCA.