Tektronix 1760 Manuel d'utilisateur télécharger pdf (Page 169)

Glossary

1760 Series Component Waveform/Vector Monitor User Manual

G-7

Modulated (PAL) When referring to television test sig-

nals, this term implies that chrominance information is pres-

ent. (For example, a modulated staircase has subcarrier on

each step.)

Modulation A process which allows signal information to

be moved to other frequencies in order to facilitate transmis-

sion or frequency-domain multiplexing. See FM for details.

Nonlinear Distortion Refers to distortions which are

amplitude-dependent.

NTSC National Television System Committee. The orga-

nization which deve loped the television standard currentl y in

use in the United States, Canada, and Japan. Now generally

used to refer t o that standard.

PAL Phase Alternate Line. Refers to one of the television

systems used in Europe and many other parts of the world.

The phase of one of the color difference signals alternates

from line to line to help cancel out phase errors.

Quadrature AM A process which allows two different

signals to modulate a single carrier frequency. The t wo sig-

nals of interest Ampl itude Modulate carrier signals which are

the same frequency but differ in pha se by 90 degrees (hence

the Quadrature notation). The two resultant signals can be

added together, and both signals recovered at the other end, if

they are also demodulat ed 90 degrees apart.

Quadrature Distortion Distortion resulting from the

asymmetry of sidebands used in vestigial sideband television

transmission. Quadrature distortion appears when envelope

detection is used, but can be eliminated by using a synchro-

nous demodulator.

RF Radio Frequency. In television applications, RF gener-

ally refers to the television signal after the picture carrier

modulation process.

RGB Red, Green, and Blue. Also referred to as GBR. The

three primary colors used in color television’s additive color

reproduction system. These are the t hree color signals gener-

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Tektronix 1760 Manuel d'utilisateur Page 169