Glossary
G-4 1760Series Component Waveform/VectorMonito r User Manual
CW Continuous Wave. Refers to a separate subcarrier sine
wave used for synchronization of chrominance informat ion.
dB (Decibel) A decibel is a logarithmic unit usedto de-
scribe signal ratios. For voltages, dB = 20 Log10 (V1/V2).
DC-Coupled A connection configured so that both the
signal (AC component) and the constant voltage on which i t
is riding (DC component) are passed through.
DC Restorer A circuit used in picture monitors and wa-
veform monitors to clamp one point of the waveform t o a
fixed DC level.
Demodulator In general, this term refers to any devic e
which recovers the original signal after it has modulated a
high-frequency carrier. In television it may refe rt o:
(1) An instrument, such as a TEKTRONIX 1450, which
takes video in itstransmitted form (modulated onto the pi c-
ture carrier) and converts it to baseband.
(2) The circuits which recover R--Y and B--Yfor NTSC sys-
tems or U and V for PAL systems from the composite signal.
Digital Components Component signals in which the
values foreach pixel are represented by a set of numbers.
Distortion If a sine wave of a single frequency is put into
a system, andharmonic content at multiples of that frequen-
cy appears at the output, there is harmonic distortion present
in the system. Harmonicdistortion is caused by nonlineari-
ties in the syst em.
Equalizer The pulses which occur before and after the
broad pulses in the vertical interval.
Envelope Detection A demodulation process in which
the shape of the RF envelope is sensed. This is the process
used by a diode detector.
Field In interlaced scan systems,the information for one
picture is dividedup into two fields. Each field contains one
half of the lines required to produce the entire picture. Adja-
cent lines in thepicture are in alternate fields.