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Head
End Source Control
- Source
(Type A): Consisting principally of video cassette recorders (VCR),
laser disc players (LDP), still video players (MVR), 35 millimeter slide
digitizer (TRV)and compact disc-interactive players (CDI), a "type
I" (arbitrary designation) is any source that is supplied from
it's manufacturer with an infra red remote control. Generally, these
are the same kinds of equipment found in consumer applications.
- Source
(Type B): Sources such as the digital video server (a PC with humongous
hard drives, sufficient to store hours of full motion video as well
as graphics, audio and text) and the Chief Leschi TVRO earth station
antenna controller/receiver (TeleVision Receive Only) are supplied from
the manufacturer with the capability to be controlled by a direct digital
stream of commands (RS-232) through a direct connection to the video
distribution system supervisor.
- Source
(Type C): Those sources that either do not require classroom control,
or are controlled exclusively over the LAN or manually are "type
C" sources. These include, but are not limited to, the output from
the Chief Leschi Television studios, various menu channels, CD-ROM content
from LAN controlled PC's located in the Headend, return video from another
classroom and the system wide all call or news channels.
- Source (Local)
Any classroom desiring to provide video back to the Headend for video
teleconferencing, schoolwide distribution or distance learning applications
or alternatively to simply display within that classroom multimedia
content of local origin can realize this option through the local input
interconnect panels available at the wall plates located in every classroom
in the general vicinity of the teacher's desk. Local component sources
(video/audio) such as a VCR, video camera, microphones and the like
can be connected to the local component jacks for local viewing (selecting
local option on the classroom control panel) or can be connected to
the portable transmitter for use in video teleconferencing or similar
distribution applications.
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