Glossary
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VTM-2400 Installation and Operation Handbook
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.
Signal to Noise Ratio-8VSB (SNR)
As applies to 8VSB transmissions, this is a calculated
average power of the ideal signal divided by the actual demodulated signal power.
SMPTE
Society of Motion Picture and Television Engineers
Standard Definition Television (SDTV)
This term is used to signify a digital television
system in which the quality is approximately equivalent to that of NTSC. This equivalent
quality may be achieved from pictures originated at the 4:2:2 level of ITU-R BT.601 and
subjected to processing as part of the bit rate compression. The results should be such that
when judged across a representative sample of program material, subjective equivalence with
NTSC is achieved. The displayed picture may be either the traditional 4:3 or the wide-screen
16:9 aspect ratio.
STL
Studio Transmitter Link
Synchronous Detection
A common detection technique used in television demodulators
that removes quadrature distortion, enabling comparison of transmitter output with video
input signal.
