But audio experts say that the basic principles the CIA uses are likely the same ones that have driven the field of voice recognition since the 1940s: use of a spectrogram, a visual representation of the frequencies of human speech.

NPR: Bin Laden Tape Won't Raise Security Levels

UNESCO, in collaboration with the Public Service Broadcasting Trust (PSBT), created a series of instructional how to videos to provide basic, conceptual and technical understanding of the audio-visual film production, with the special focus on the independent documentary.

UNESCO: Communication and Information

At its most basic, lecture capture does exactly that: captures audio or video recordings of classroom lectures.

FORBES: Digital Teaching Promises to Improve Grades

The basic idea is to start the game off in a primarily audio-based murder mystery scenario where "actual forests, skyscrapers, and rivers" become part of the story, giving children (or adults, too) a way to virtually interact with their surroundings while traveling.

ENGADGET: Backseat Playground to integrate GPS into in-car gaming