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.

12 thoughts on “TAVES Day 1

  • Andrew

    Hi Mark. It was very nice to meet you at the TAVES show. Yes marketing terms and such does pollute many minds. I have some of your HiRes discs which are the real thing as they were recorded with the right equipment from the start and processed with the right equipment. I also own a few Blu-ray Pure Audio DVD. With the exception of one of them, the are not HiRez audio. I bought them because they had be remastered and in a way that is better or a nice compilation.

    Pretty soon 2 + 2 will equal 7.

    Andrew

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    • Thanks for coming by Andrew…it’s been a very pleasant show.

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  • You have my sympathy, I worked many shows over the years first in high performance auto accessories market later in motorcycle accessories. Many days I went hope feeling like I spent the day in a KGB mind reprogramming interrogation. Painful days indeed.

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  • Spirit

    I attended the show on Friday and also had the privilege of attending Mark’s seminar. What a treat and a true revelation: Finally a member of the audio/video industry that has the stones to be honest and forthcoming re the so-called “High Res” audio conundrum. When a company like HDTracks sells a 24/192 download of an album that was recorded in the 1970’s to analog tape – how can this be considered High res? I doubt that HDTracks or a company of that ilk has the ability to obtain the original master tapes or even pay to obtain them. So these digital transfers are from possibly 2nd or 3rd genration analog transfers. High res? I think not. What a total waste of money. You want High res? Buy Mark’s products! One of the only true High res sources in the world today!
    If one defines High Res audio as being recorded at 24/96 as a minumum and then transferred accordingly then Mark is one of the few engineers who is doing so.
    Mark: if you read this: regarding the old guy with the cane: was he wearing a nice hat and did he have a European accent?

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    • Sam…thanks for coming to the session and kind words. HDtracks and the other licensees get their files from the studio’s mastering rooms. They get what they get. It’s all in the marketing and identifying the provenance where the spin starts.

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  • Music is a highly dynamic, sharply transient time-domain phenomenon. What’s important (to us as listeners) for those cymbals and drums is not their spectral content, but the sharpness of the rise in sound intensity as a function of time. Now, it is true that electrical engineers learn in college/university that such an intensity-vs-time signal can be transformed into an amplitude-vs-frequency graph giving its spectral content, using the Fourier Transform. But the Fourier Transform is truly correct only for continuous signals that have the same waveform repetitively over an infinite time period. It is only approximately true for signals that are “continuous and have the same waveform repetitively” over a time interval that is very long compared to the period of the lowest “frequency” (repetition) of the signal. Neither of these is true for those dynamic transient cymbal sounds, so the Fourier Transform does not accurately relate the “spectral content” of those cymbal sounds to their actual time-domain existence.

    What this means is that the human listener can hear the complete dynamic transient characteristics of those cymbal sounds, even though a frequency-domain analysis of human hearing suggests that the “spectral content” of those sounds includes frequencies that the human ear is unable to respond to—the human ear simply isn’t hearing those sounds in the frequency domain!

    The original CD sampling rate of 44.1kHz is too low for the proper reproduction of those transient sounds from drums, cymbals, etc.

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    • Zero evidence supports your claims, Jay. It is dangerous to fall prey to one’s own internal logic, with no reference to evidence. There are many websites where you can learn more about human hearing, and about the mathematical representation of waves, and a little about their overlap.

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  • Digital music can sound naturally only if recorded at a sample rate of no lower than 1 MHz .

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    • I am sorry, but this nonsensical comment needs to be called. I call.

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    • I found this article to be very enlightening. Thanks.

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  • philmagnotta

    If that is correct, you’d need a speaker system capable of 1 meg as well.

    Reply

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