Appendix D
♦
Glossary
CMN-41 Series Installation and Operation Handbook
141
Copyright © 2009, Harris Corporation
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.
Quad
In the CMN-41, this term applies to a screen that contains four panes.
RGB Legalization
Limiting of luminance and color difference video signals such
that, once transcoded into RGB 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
SAW Filter
Surface Acoustic Wave filter
