Imagine Videotek LLM-1770, Installation And Operation Manual

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LLM-1770
Installation and Operation Manual
93
Program. A transport stream combination of a video stream and one or more audio and
data streams associated with that video stream. In analog terms, “Program” refers to the
Base Band video and audio produced by the final output of a switcher.
Program Association Table (PAT). A list of all programs that are in the ATSC data stream.
Program Map Table (PMT). A listing of all elementary streams that comprise a complete
(television) program.
Program Clock Reference (PCR). This is a time reference signal that is placed in MPEG
streams for the purpose of time coordinating various data streams.
Program and System Information Protocol (PSIP). Information sent out as part of an
ATSC transport stream which lists all of the video, audio, data and program information
contained in the stream. This is the “TV guide” for a given stream.
Progressive Scanning. Also non-interlaced. A system of video scanning where lines of a
picture are transmitted consecutively, such as with VGA monitor displays.
Push-push Toggle Switch. An electro-mechanical device which, when pushed, alternates
the condition of the switch. Push once, it’s off, push again, it’s on.
Quadrature Output. An output in a television demodulator used for measuring Incidental
Carrier Phase Modulation (ICPM) in a transmitter.
QPSK. Quadrature Phase Shift Keying, typically used by satellite downlinks.
QAM. Quadrature Amplitude Modulation, the technique used by cable TV systems
(64-QAM and 256-QAM) to remodulate signals for distribution in a cable plant.
GRB Legalization. Limiting of luminance and color difference video signals such that, once
transcoded into GRB component video signals, the resultant video does not violate the
maximum or minimum signal levels as defined by component video level rules. Typically, the
maximum value for R, G, or B is 700 mV, and the absolute minimum value for any of these
signals is 0 mV.
Reclocking. The process of regenerating digital data with a clock recovered from the input
data.
Resolution. A measure of the finest detail that can be seen, or resolved, in a reproduced
image.
RS. Right Surround
RS-422. Recommended Standard number 422, an E.I.A. standard which describes a type of
data interchange. Television products use this standard as its communication format
between the electronics frame and editors, control panel and computers. An RS-422 line
may be extended up to 1,000 feet (304m).
Sampling. Process by which an analog signal is sampled to convert the analog signal to
digital.
SAP. Secondary Audio Program, used in television broadcast for second language
broadcasting, simulcasting, and separate audio programming.
Saturation. Color intensity