vertical encoding - définition. Qu'est-ce que vertical encoding
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Qu'est-ce (qui) est vertical encoding - définition

DURATION BETWEEN THE WRITING OF THE FINAL ROW OF ONE FRAME IN A TELEVISION SIGNAL AND THE WRITING OF THE INITAL ROW IN THE NEXT FRAME, DURING WHICH THE DISPLAY IS ALLOWED TO RESET AND THE DISPLAY HEAD TO RETURN TO THE FRAME START POSITION
Vertical interval; Vertical blank; Vertical Blanking Interval; VBlank; Vertical retrace; Vblank; Vertical blanking; Vertical retrace interval

vertical encoding      
<processor> An instruction set where a field (a bit or group of bits) of the instruction word is decoded (either by hard-wired logic or microcode) to generate signals to control the functional units, as opposed to {horizontal encoding} where the instruction word bits are used as the control signals directly. With vertical encoding, which combinations of signals and operations are possible is dictated by the decoding logic; the instruction field can only select one of these preprogrammed combinations. This has the advantage that many control signals can be generated based on only a few instruction word bits and only valid combinations of control signals can be generated, e.g. only one source driving a bus at once. An instruction set may use a mixture of horizontal and vertical encoding within each instruction. (1995-04-23)
Encoding (memory)         
  • Early LPT Mechanism
  • Hermann Ebbinghaus (1850-1909)
  • Vase or faces?
  • The mnemonic "Roy G. Biv" can be used to remember the colors of the rainbow
  • American Penny
MEMORY PROCESS
Encoding (Memory); Memory encoding; Computational models of memory encoding
Memory has the ability to encode, store and recall information. Memories give an organism the capability to learn and adapt from previous experiences as well as build relationships.
vertical         
WIKIMEDIA DISAMBIGUATION PAGE
Verticality; ↕; ↨; Verticals; Vertical (disambiguation); ↕ (disambiguation)
1.
Something that is vertical stands or points straight up.
The gadget can be attached to any vertical or near vertical surface.
? horizontal
ADJ
vertically
Cut each bulb in half vertically.
ADV: ADV after v
2.
The vertical is the direction that points straight up, at an angle of 90 degrees to a flat surface.
Pluto seems to have suffered a major collision that tipped it 122 degrees from the vertical.
N-SING: the N

Wikipédia

Vertical blanking interval

In a raster scan display, the vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time between the end of the final visible line of a frame or field and the beginning of the first visible line of the next frame. It is present in analog television, VGA, DVI and other signals.

In raster cathode ray tube displays, the blank level is usually supplied during this period to avoid painting the retrace line — see raster scan for details; signal sources such as television broadcasts do not supply image information during the blanking period. Digital displays usually will not display incoming data stream during the blanking interval even if present.

The VBI was originally needed because of the inductive inertia of the magnetic coils which deflect the electron beam vertically in a CRT; the magnetic field, and hence the position being drawn, cannot change instantly. Additionally, the speed of older circuits was limited. For horizontal deflection, there is also a pause between successive lines, to allow the beam to return from right to left, called the horizontal blanking interval. Modern CRT circuitry does not require such a long blanking interval, and thin panel displays require none, but the standards were established when the delay was needed (and to allow the continued use of older equipment). Blanking of a CRT may not be perfect due to equipment faults or brightness set very high; in this case a white retrace line shows on the screen, often alternating between fairly steep diagonals from right to left and less-steep diagonals back from left to right, starting in the lower right of the display.

In analog television systems the vertical blanking interval can be used for datacasting (to carry digital data), since nothing sent during the VBI is displayed on the screen; various test signals, time codes, closed captioning, teletext, CGMS-A copy-protection indicators, and various data encoded by the XDS protocol (e.g., the content ratings for V-chip use) and other digital data can be sent during this time period.

In U.S. analog broadcast television, line 19 was reserved for a Ghost-canceling reference & line 21 was reserved for NABTS captioning data. The obsolete Teletext service contemplated the use of line 22 for data transmission.

The pause between sending video data is sometimes used in real time computer graphics to modify the frame buffer, or to provide a time reference for when switching the source buffer for video output can happen without causing a visible tear. This is especially true in video game systems, where the fixed frequency of the blanking period might also be used to derive in-game timing.

On many consoles there is an extended blanking period, as the console opts to paint graphics on fewer lines than the television would natively allow, permitting its output to be surrounded by a border. On some very early machines such as the Atari 2600, the programmer is in full control of video output and therefore may select their own blanking period, allowing arbitrarily few painted lines. On others such as the Nintendo Entertainment System, a predefined blanking period could be extended.

Most consumer VCRs use the known black level of the vertical blanking pulse to set their recording levels. The Macrovision copy protection scheme inserts pulses in the VBI, where the recorder expects a constant level, to disrupt recording to videotapes.