Glosario

Glossary

video terms and acronyms

This Glossary of Video Terms and Acronyms is a compilation of material gathered over time from numerous sources. It is provided "as-is" and in good faith, without any warranty as to the accuracy or currency of any definition or other information contained herein. Please contact Tektronix if you believe that any of the included material violates anyproprietary rights of other parties.

Video Terms and Acronyms
Glossary

1-9
0H – The reference point of horizontal sync. Synchronization at a video interface is achieved by associating a line sync datum, 0H, with every scan line. In analog video, sync is conveyed by voltage levels “blackerthan-black”. 0H is defined by the 50% point of the leading (or falling) edge of sync. In component digitalvideo, sync is conveyed using digital codes 0 and 255 outside the range of the picture information. 0V – The reference point of vertical (field) sync. In both NTSC and PAL systems the normal sync pulse for a horizontal line is 4.7 µs. Vertical sync is identified by broad pulses, which are serrated in order for a receiver to maintain horizontal sync even during the vertical sync interval. The startof the first broad pulse identifies the field sync datum, 0V. 1/4” Phone – A connector used in audio production that is characterized by its single shaft with locking tip. 1/8th Mini – A small audio connector used frequently in consumer electronics. 1:1 – Either a perfectly square (9:9) aspect ratio or the field:frame ratio of progressive scanning. 100 Field Per Second – Field rate of some Europeanproposals for a world standard for ATV (Advanced Television). 100% Amplitude, 100% Saturation – Common reference for 100/7.5/100/7.5 NTSC color bars. 100/0/75/7.5 – Short form for color bar signal levels, usually describing four amplitude levels. 1st number: white amplitude 2nd number: black amplitude 3rd number: white amplitude from which color bars are derived 4th number: black amplitude fromwhich color bars are derived In this example: 75% color bars with 7.5% setup in which the white bar has been set to 100% and the black to 0%. 1080i – 1080 lines of interlaced video (540 lines per field). Usually refers to 1920 x 1080 resolution in 1.78 aspect ratio. 1080p – 1080 lines of progressive video (1080 lines per frame). Usually refers to 1920 x 1080 resolution in 1.78 aspect ratio. 12.5TSine-Squared Pulse with 3.579545 MHz Modulation – Conventional chrominance-to-luminance gain and delay measurements are based on analysis of the baseline of a modulated 12.5T pulse. This pulse is made up of a sine-squared luminance pulse and a chrominance packet with a sine-squared envelope as shown in the figure below. This waveform has many advantages. First it allows for the evaluation of bothgain and delay differences with a single signal. It also eliminates the need to separately establish a low-frequency amplitude reference with a white bar. Since a low-frequency reference pulse is present along with the high-frequency information, the amplitude of the pulse itself can be normalized. The HAD of 12.5T was chosen in order to occupy the chrominance bandwidth of NTSC as fully as possibleand to produce a pulse with sufficient sensitivity to delay distortion.
0.5 BOTH COMPONENTS ADDED LUMINANCE COMPONENT 0 0.5 CHROMINANCE COMPONENT 0 1 A HAD 1.56 µs

0 3.12 µs MOD 12.5T PULSE

-0.5 3.12 µs

125M – See SMPTE 125M. 1410 NTSC Test Signal Generator – Discontinued analog circuit based Tektronix test signal generator that is used to generate full field composite analog testsignals. Has been replaced by the Tektronix TSG-170A. 1450 Demodulator – Tektronix high quality demodulator that provides envelope and synchronous demodulation. 1480 Waveform Monitor – Discontinued Tektronix waveform monitor. It has been replaced by the 1780R. 16 QAM – (16 Quadrature Amplitude Modulation) 16 VSB – Vestigial sideband modulation with 16 discrete amplitude levels. 16 x 9 – A widescreen...