horizontal blanking การใช้

• Only the horizontal blanking part of the TV waveform can be used.
• In video games, the horizontal blanking interval was used to create some notable effects.
• Horizontal blanking is between lines and vertical blanking is between fields ( half frames ).
• The parameters defined by standard include horizontal blanking and vertical blanking intervals, horizontal / vertical sync polarity.
• There was also a version that encrypted the audio using a digital audio stream in the horizontal blanking interval like the VCII system.
• The video parameters defined by the standard include horizontal blanking ( retrace ) and vertical blanking intervals, horizontal / vertical sync polarity.
• The VBI was originally needed because of the inductive inertia of the magnetic coils which deflect the electron beam vertically in a horizontal blanking interval.
• During the horizontal blanking period between lines, the 6502 would quickly change the TIA's registers to the data needed for the next line.
• In the NTSC television standard, horizontal blanking occupies ( 17.2 % ) out of every | u = us } } scan line.
• SMPTE 344M defines a 576p50 standard with twice the data rate of BT . 601, using 704 ?576 active pixels with 16 x 576 horizontal blanking pixels.
• SMPTE 344M defines a 480p59.94 standard with twice the data rate of BT . 601, using 704 ?480 active pixels with 16 x 480 horizontal blanking pixels.
• A synchronization packet occurs immediately before the first active sample on every line, and immediately after the last active sample ( and before the start of the horizontal blanking region ).
• Note that this behavior differs somewhat from analog video interfaces, where the line transition is deemed to occur at the sync pulse, which occurs roughly halfway through the horizontal blanking region.
• On each machine supporting this effect, it is possible to change the scaling and rotation values during the horizontal blanking period of each scanline to draw a flat plane in a perspective projection.
• The 68000 and video controller took turns accessing DRAM every four CPU cycles during display of the frame buffer, while the 68000 had unrestricted access to DRAM during vertical and horizontal blanking intervals.
• It recorded and played back black-and-white " PCM, and was recorded by being inserted in the " back porch " of the horizontal blanking interval pulses of the video.
• In a poorly tuned TV receiver the horizontal blanking can be seen at the right or left of the image and the vertical blanking can be seen at the top or bottom of the image.
• It is transmitted using non-return-to-zero encoding at a bit rate of 115 times the line rate . ( The unused 25 bit times are to leave room for the horizontal blanking interval .)
• At the top of the frame, the video memory is typically blank, and every horizontal blanking interval it is updated with a new " bar " in a slightly different position, creating a " stepped " effect.
• In fact, spikes " do " occur, both horizontally and vertically, and the corresponding horizontal blanking interval and vertical blanking interval give the deflection currents settle time to retrace and settle to their new value.