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Digital Audio Testbed

Testbed research successfully completed in Spring of 2002.

Archive Records (before 1998)

The Learning Technologies Channel broadcasts live educational content using RealMedia software over the Internet. The goal of the Digital Audio Testbed (DAT) Project is to produce a distributed digital audio-based Internet infrastructure that will support extension of RealMedia connectivity over NASA's Learning Technologies Channel to 5,000 clients in schools across the nation. The NASA Glenn Learning Technologies Project is a site on the DAT network, as well as a content provider.

Technical Requirements:

If you would like to view the testbed, your system must meet the following minimum requirements:

  • 28.8 kb/s modem connection
  • Netscape 3.0
  • RealMedia 5.0 Player or RealMedia G2 Player
  • PC or Mac platform
  • multimedia capability
  • 8 Mbytes of RAM
  • multitasking
  • system speed of at least 66 Mhz.

View Live Cybercast:

NASA Television is broadcast over the DAT throughout the day, but is pre-empted by live educational broadcasts. A schedule of events is available at the Learning Technologies Channel schedule. During popular NASA events, such as launches and landings, servers may be accessed to capacity. Current maximum capacity is for 2,300 streams. Email for information about the next Real Video Cybercast (link is active during scheduled web casts only.)

The video stream is designed to work over a 28.8 Kbps modem. It has been our experience that even fairly powerful machines on fast connections can play streaming "live" video at about only five frames per second. Our encoder is set for an optimized frame rate of 20 Kb. This translates to about 1 to 3 frames per second at 320 by 240 pixels.

Archived Events:

The NASA Glenn Learning Technologies Project has also produced live events that have been broadcast over the Digital Audio Testbed. A description of the event and the RealVideo archive are provided below. Please make sure you have checked out the system requirements before you try to view the archives.  

Tours of NASA Glenn Research Center Facilities - RealVideo

Welcome to a special set of tours of the NASA Glenn Research Center in Cleveland, OH. NASA Glenn Research Center's primary mission is aeropropulsion research and technology and is NASA's Center of Excellence in turbomachinery. We are committed to being "World Class" in providing advanced propulsion and power technologies to the U.S. aeropropulsion and aerospace industry. Our ongoing research supports the nation's goals to develop quieter, cleaner, and safer airplanes. The technology is transferred to the aviation industry to help maintain U.S. leadership in the world's aviation market. Tomorrow's passenger aircraft will have even better fuel efficiency and more advanced systems than the current state-of-the-art airliners. This presentation is a tour of three of our facilities. For more background information on the tour please visit the Virtual Tour web site.

Introduction to Aerodynamics - RealVideo

Introduction to Aerodynamics demonstrates how 9th-12th grade math and physics teachers can use basic aerodynamic theories incorporated into interactive lessons, to enhance classroom instruction. This workshop utilizes the Beginner's Guide to Aerodynamics to provide background information on basic aerodynamics and propulsion. The Beginner's Guide to Aerodynamics is an on-line, living textbook created by the NASA Glenn Learning Technologies Project.

Introduction to FoilSim - RealVideo

Introduction to FoilSim demonstrate how to supplement existing high school curriculum with a free interactive simulation software package. FoilSim determines the airflow around various shapes of airfoils. Students change the position and shape of the wing by moving slider controls that vary the parameters of airspeed, altitude, angle of attack, thickness and curvature of the airfoil, and size of the wing area. The software displays plots of pressure or airspeed above and below the airfoil surface. The software calculates the lift of the airfoils, allowing students to learn the factors that influence lift. For more information on FoilSim or to download the FoilSim software, please visit the FoilSim web site.

October 9, 1998 Turning Goals Into Reality: Web Cast and Chat

NASA's Aeronautics and Space Transportation Technology Enterprise held its inaugural "Turning Goals into Reality" conference at NASA Glenn Research Center in Cleveland, OH. The Learning Technologies Project cybercast this event live and had a chat room open so that questions could be asked to the speaker's from around the nation. You can follow along as key government and industry representatives discuss critical issues in our Nation's aviation and space transportation systems. It is a chance for educators, students, and the general public, to find out real-time what is happening in NASA's programs, how the results will affect their lives, and what the future might bring.

Archive of Morning Session includes : RealAudio

Opening remarks:
Daniel S. Goldin, NASA Administrator
Jane F. Garvey, FAA Administrator
T.J. Glauthier, Office of Management and Budget
Archive of the Afternoon Sessions includes: RealAudio
Panel discussions Three Pillars for Success 

Please send any comments to:
Web Related:
Technology Related:
Responsible NASA Official: Theresa.M.Scott (Acting)