Glossary

Subcarrier The modulation sidebands of the color subcar- rier contain the R-Y (V) and B-Y (U) information. For NTSC, subcarrier frequency is 3.579545 MHz. For PAL, subcarrier frequency is 4,433,618.75 Hz.

Synchronous Detection A demodulation process in which the original signal is recovered by multiplying the modulated signal with the output of a synchronous oscillator locked to the carrier.

Termination In order to accurately send a signal through a transmission line, there must be an impedance at the end which matches the impedance of the source and of the line itself. Amplitude errors and reflections will otherwise result. Video is a 75 Ω system, so a 75 Ω terminator must be put at the end of the signal path.

Time Code, Longitudinal (LTC) LTC is an 80-bit signal with information which makes it possible to accurately identify an individual frame. The LTC signal is typically recorded on an audio channel.

Time Code, Vertical (VITC) VITC is a signal in the vertical interval of video, which makes it possible to accurately identify an individual field.

UThe B-Y signal after a weighting factor of 0.493 has been applied. The weighting is necessary to reduce peak modula- tion in the composite signal.

Unmodulated When used to describe television test signals, this term refers to pulses and pedestals which do not have high-frequency chrominance information added to them.

VThe R-Y signal after a weighting factor of 0.877 has been applied. The weighting is necessary to reduce peak modula- tion in the composite signal.

Vectorscope A specialized oscilloscope which demodulates the video signal and presents a display of R-Y versus B-Y in NTSC systems (or V versus U in PAL systems). The angle and magnitude of the displayed vectors are respectively related to hue and saturation.

G-8

1740A/1750A Series Waveform/Vector Monitor User Manual