CPD
Common Path Distortion: a form of inter-
modulation distortion caused by mixing when
an RF spectrum passes through a non-linear
junction. Also caused by material
deterioration and irregularities in the
transmission line.
CSO
Composite Second Order: clustering of
second-order beats at any frequency of the
spectrum. CSO in the video bandwidth can
cause distortion of video in cable systems.
Measured as the ratio , in dB, of the peak
level of the visual carrier to the peak of the
average level of CSO.
CTB
Composite Triple Beat: spurious frequencies
generated by the sum and difference products
of any three carriers passing through s non-
linear circuit or device. Detected as a voltage.
CW
Continuous Wave. Under steady-state
conditions, successive CW oscillations are
identical.
D/U
Desired/Undesired, also called Carrier to
Garbage
DVA
Ratio of video level to audio level, expressed
in dB.
Depth of
Modulation
Ratio of peak downward change in modulation
to carrier amplitude, expressed as a
percentage. ( Roddy/Coolen)
DSP
Digital Signal Processor: converts digital input
into analogue or pulse-rate outputs.
DTV
Digital TV
Edit Box
On many LCD screens you are required to
make changes, or have the option of making
changes to system parameters. In these
instances the Edit box appears as the last line
of the LCD screen. It also carries instructions,
when appropriate. such as “Press ENTER….”
Equalization
Reducing distortion of frequency and/or phase
by compensating for attenuation and/or time-
delay at frequencies within the transmission
band.
Frequency
Modulation
(FM)
A modulating signal varies the frequency of
the carrier wave.