Specifications

Glossary
VTM-2000 Installation and Operation Handbook
D-8
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.
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
Segment Error Rate (SER) A calculated average of uncorrected transport stream
packets vs. total packets as accumulated over a designated period of time.
Signal to Noise Ratio -Analog (SNR) A measurement of the noise level in a signal
expressed in dB (decibels) as a ratio of between the audio or video signal’s maximum
peak-to-peak signal voltage and the measured voltage of noise present when the signal
is removed. Higher SNR figures indicate that any noise introduced by system
components will not be perceived in the picture and sound output signals.