Specifications

Glossary
VTM-200 Installation and Operation Handbook E-8
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.
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.
S-Video Also Y/C. Transmits luminance and color portions separately via multiple
wires, thus avoiding the color encoding process and resulting loss of picture quality.