Dr. AIX

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 “The Natural Harmonic Series

  • September 3, 2014 at 5:05 am
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    Just to extend the conversation a little further: Another important factor in distinguishing one instrument from another is their dynamic “envelope” – how the sound rises, sustains, and decays over time. Some instruments can have a similar harmonic structure (or timbre) but because of their attack or decay are recognized as different and unique. I also believe that the “phase” relationship between the harmonics is also very important for the accurate reproduction of an instrument. Some microphones and loudspeakers are better at preserving these “time domain” relationships better than others while some make a mess of it.

    Also – some of the sounds an instrument creates are not harmonically related to the pitch being played – in other words there are “noises” associated with the sound of that particular instrument. An example is the initial clicking noise of a guitar when the string is “picked” or the scraping sound of a bow on the strings of a cello. High definition recordings maintain these nuances with great detail and contribute greatly to the feeling of “aliveness” of the recording.

    I’m really enjoying your daily posts. Very thought provoking!

    Reply
    • September 3, 2014 at 2:48 pm
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      Very true…and thanks for the additional explanation. I didn’t talk about time or spectra envelopes…or inharmonic elements, but they are all important considerations.

      Reply

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