For reporting purposes, report the technology that is used at the student's receive site. Audio systems that have an interactive graphics system should also be reported under audio teleconferencing. These channels can be either PBS of commercial channels. Over one-half of the colleges in the U.S. have an educational access channel. Until recently most of their programs were recorded telecourses, but may are now offering live televised instruction.
Students usually have the option to use a telephone to talk with instructors during the programs.
A computer requires abaout 2Mb of memory to store a single 24 bit color image with a 1024x768 resolution. To simulate motion, the system must deliver 30 of these images per second. A 40 min. Video compression works by analyzing each frame and discarding or recoding the information. This is usually for individual instruction.