1967 Time Delay Spectrometry

Sep 1, 2006 4:07 PM

Polls


Mix Regional

The Mix Regional section for Mix's September 2014 issue focuses on Miami. Send us your studio news: updates, sessions, new rooms, plus club performances and installations. Let the Mix audience know what is going on! Send photos and descriptions to mixeditorial@nbmedia.com.

In 1967, Richard C. Heyser, a research engineer at the Jet Propulsion Laboratory of the California Institute of Technology published a paper in the AES Journal titled “Acoustical Measurements by Time Delay Spectrometry.” It described a technique whereby loudspeakers and other electro-acoustical systems could be measured in real-world spaces—without an anechoic chamber. Unfortunately, the horsepower to perform such computations using 1960s technology was impossible, but Heyser’s TDS concept drew wide acceptance.

TEF System 12, the second-generation TDS analyzer

Later, educator Don Davis organized a seminar for 20 leading audio researchers, with California Institute of Technology offering them licenses to build and operate TDS devices created by combining off-the-shelf products with a custom Heyser-designed interface.

TDS went big time in 1983, when Crown’s Techron division unveiled the TEF System 10, the first portable TDS analyzer/acoustical measurement system. Encompassing the gamut of TDS measurements, TEF (Time-Energy-Frequency) included energy time curves and the ability to show waterfall displays of audio spectra. The 40-pound suitcase unit included 96 kilobytes of RAM and a 9-inch green-phosphor screen, and it cost $14,500. However, acoustical research would never be the same, as for the first time, complex on-site measurements of systems and spaces were possible from a commercially available unit.






Acceptable Use Policy
blog comments powered by Disqus

Mix Books

Modern Recording and Mixing

This 2-DVD set will show you how the best in the music industry set up a studio to make world-class records. Regardless of what gear you are using, the information you'll find here will allow you to take advantage of decades of expert knowledge. Order now $39.95

Mastering Cubase 4

Electronic Musician magazine and Thomson Course Technology PTR have joined forces again to create the second volume in their Personal Studio Series, Mastering Steinberg's Cubase(tm). Edited and produced by the staff of Electronic Musician, this special issue is not only a must-read for users of Cubase(tm) software, but it also delivers essential information for anyone recording/producing music in a personal-studio. Order now $12.95

Newsletters

MixLine

Delivered straight to your inbox every other week, MixLine takes you straight into the studio, with new product announcements, industry news, upcoming events, recent recording/post projects and much more. Click here to read the latest edition; sign up here.

MixLine Live

Delivered straight to your inbox every other week, MixLine Live takes you on the road with today's hottest tours, new sound reinforcement professional products, recent installs, industry news and much more. Click here to read the latest edition; sign up here.

[an error occurred while processing this directive]

The Wire, a virtual press conference offering postings of the latest gear and music news, direct from the source. Visit the The Wire for the latest press postings.