Glossary
© 2013 Harmonic Inc.
396
Ellipse 3000 r.3.0, Rev. B
The spatial activity value is the average of the spatial activity for all frames during the
sampling period. For IRIS, the spatial activity value range is 0 to 100. Video content with little
variation of detail, for example, blue sky or a white wall, will have a low spatial activity value.
Compare this to
.
spectral scrambling
A method that spreads the energy over a range of frequencies to minimize interference with
other transponders.
SPPC
Separate PID Per Channel. SPPC allows two audio circuits per audio adapter port, where each
circuit is identified by a separate PID. SPPC supports mono channels by encoding the right and
left channels of each stereo pair as separate channels. This doubles the audio capacity of the
adapter port. SPPC is only supported on specific audio adapters.
SPTS
MPEG-2 Single Program Transport Stream.
SR
Symbol Rate.
SRC
Seamless Rate Change. The ability to change video bandwidth in a circuit without causing
disturbance, such as coding artifacts or buffer exceptions.
Statistical Multiplexing Pool
A group of programs that share a set amount of bandwidth. Each program is allocated
bandwidth based on the complexity of the program during a specified time interval. The
program may be allocated a different amount of bandwidth during the next interval based on
its complexity and the complexity of the other programs in the pool.
status bar
The status bar, usually located at the bottom of the application window, indicates the current
selection and displays explanatory text for toolbar and menu selections.
STB
Set Top Box.
STC
System Time Clock. This clock is the common 27-MHz clock that is used to create both PCRs
and system clock references (SCRs).
stereo
A stereo signal consists of two audio signals that are directly related to each other, one signal
representing the left side of the soundfield and the other the right side.
