horizontal scan rate การใช้

• A resonant circuit is commonly employed, restricting the allowable horizontal scan rates to one or more very narrow ranges.
• This rate can be increased with the ECS and AGA chipsets by using a video mode with higher horizontal scan rate.
• While stand-alone LCD monitors generally accept a wide range of horizontal scan rates, the same is not true of the vertical scan rate.
• For example, a monitor designed for use with CGA, EGA and VGA standards could elect to support 15 kHz, 23 kHz and 31 kHz horizontal scan rates.
• A typical screen resolution of the late 1990s was 1024x768 at 85 Hz, requiring a horizontal scan rate over 85 kHz, yet during system boot the POST display and operating system splash screen would be displayed at the standard VGA 31 kHz.
• However, the sound hardware remains identical to the design used in the Amiga 1000, though the AGA chipset allows higher sampling rates for sound playback, either by using a video mode with higher horizontal scan rate or by using the CPU to drive audio output directly.
• The refresh rate can be calculated from the horizontal scan rate by dividing the scanning frequency by the number of horizontal lines multiplied by 1.05 ( since about 5 % of the time it takes to scan the screen is spent moving the electron beam back to the top ).
• Some cathode ray tubes can emit a high pitched sound, probably a sub-resonance of the horizontal scan rate ( the actual scan rate is well above our hearing range . ) You might find it goes away if you turn off all televisions and computer monitors in your house.
• Given the horizontal scan rate, the refresh rate can be approximated by dividing the horizontal scan rate by the number of horizontal lines multiplied by 1.05 ( since about 5 % of the time it takes to scan the screen is spent moving the electron beam back to the top ).
• Given the horizontal scan rate, the refresh rate can be approximated by dividing the horizontal scan rate by the number of horizontal lines multiplied by 1.05 ( since about 5 % of the time it takes to scan the screen is spent moving the electron beam back to the top ).