elements in a CCD (chip) camera.
so that the electronic system has time to stabilize.
playbacks or transfers electronically stable. A TBC
helps to maintain picture stability even in dubbing-up
Used in all but the 1-inch VTRs.
understand if you think of it in the same terms as a record
and a phonograph. Analog systems record the
continually fluctuating video signal that is created and
processed by a video source (camera) on videotape.
by magnetizing the iron oxide coating on the videotape.
During playback, the recorded video and audio signals
are converted again by the television set into television
information is many times greater for video than for
systems can be divided roughly into three subsections:
analog and digital; composite (Y/C), and component;
and tape formats.
blue video signals throughout the entire recording
process. Each of the three signals remains separate even
when laid down on the videotape. The component
system requires three wires to transport a video signal.
system requires three wires to handle the video signal
that is incompatible with the NTSC system.
into a single NTSC composite signal before it can be
as an identical, continually fluctuating signal from the
office computer. Digital-video systems convert the
analog video signals by sampling (selecting parts of) the
scanned image. It then translates the scanned image into
millions of independent, fixed, values called pixels. A
pixel is the smallest single picture element from which
images are constructed. Each pixel has its own color
(hue and saturation) and luminance values. These values
are expressed as binary numbers (series of zeros and
ones). The binary numbers are then stored on, and
retrieved from, videotape or other storage mediums,
such as large-capacity disks.
composite video signal means that the luminance
information ("Y" signal), chrominance information
("C" signal), and the sync information are combined
into a single signal (Y+C+sync). Standard television
information is designed to operate with composite video
signals. Only one wire is required to transport a
composite video signal. This composite signal is usually
called NTSC, because the electronic specifications for
a composite video signal were adopted by the National
Television Standards Committee.
luminance information. This interference becomes
more noticeable through each videotape generation.
Basic Photography Course