Specifications

Glossary
VTM Series Installation and Operation Handbook
C-9
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.
Tally A system used to light lamps and indicate usage. Most production switchers have
an internal tally system to indicate selected functions, and which selected functions are
currently involved with Program.
TCP Transmission Control Protocol
Telecine A device used to convert film to video; movie film is digitally sampled and
converted to video frame by frame in real-time.
TCXO Temperature Compensated Crystal Oscillator
THD Total Harmonic Distortion
Transport Stream-ATSC (TS) Consists of the following: (1) Packets: 188 bytes -
fixed length with descriptive data, (2) Carries several programs, (3) has a PID which
identifies the type of TS packet (video, audio, other), and (4) carries descriptive
information about the program.
UHF Ultra High Frequency
Unity Gain An electronic term indicating that a signal will be neither amplified or
attenuated. One volt of signal level in results in one volt of signal level out.
Vector A measure that has two individual properties: magnitude and direction.
Vector Clip A special encoded clip version that limits only the C
B
and C
R
input video
signals and does not affect (nor is it affected by) the luminance component. This
color-only clip limits the maximum vector excursions as viewed in an encoded state
and is intended for users who wish to prevent encoded vectors from ever exceeding the
perimeter circle of an encoded vector display.
VHF Very High Frequency