Mark Waldrep, aka Dr. AIX, has been producing and engineering music for over 40 years. He learned electronics as a teenager from his HAM radio father while learning to play the guitar. Mark received the first doctorate in music composition from UCLA in 1986 for a "binaural" electronic music composition. Other advanced degrees include an MS in computer science, an MFA/MA in music, BM in music and a BA in art. As an engineer and producer, Mark has worked on projects for the Rolling Stones, 311, Tool, KISS, Blink 182, Blues Traveler, Britney Spears, the San Francisco Symphony, The Dover Quartet, Willie Nelson, Paul Williams, The Allman Brothers, Bad Company and many more. Dr. Waldrep has been an innovator when it comes to multimedia and music. He created the first enhanced CDs in the 90s, the first DVD-Videos released in the U.S., the first web-connected DVD, the first DVD-Audio title, the first music Blu-ray disc and the first 3D Music Album. Additionally, he launched the first High Definition Music Download site in 2007 called iTrax.com. A frequency speaker at audio events, author of numerous articles, Dr. Waldrep is currently writing a book on the production and reproduction of high-end music called, "High-End Audio: A Practical Guide to Production and Playback". The book should be completed in the fall of 2013.

2 thoughts on “Moving Up to Less Dynamic Range

  • I suppose the old Dolby B and Dolby C tape recording technologies were an example of upward compression. Although in their case the purpose was to suppress the noise floor of the tape, and *maintain* the dynamics of the final playback material.

    • Dolby B and Dolby C were actually somewhat different. The “B” version that we all remember did boost the level of the high frequency signal during the recording stage and then reduced it by an equal and opposite amount on playback resulting in less hiss. Many of us didn’t bother with the decoding because the sound was much brighter.


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