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Why Does a Screen Re-Draw Make Noises?

grungy asks: "On several computers I have owned, I have noticed an audible noise related to large screen re-draws. A hardware guy once hypothesized that the large memory-move operation was creating electronic 'noise' which was then picked up and audibly amplified by my speaker. I unwired my speaker, removed it from the machine and put it in a different room, and the phenomenon still occurred. At this point I assumed it was something going on/emanating from the monitor itself. Now I have a TiBook laptop with an LCD panel. At quiet moments I can still hear it when I drag windows around. I have tried doing big memcpy's & the like, I don't get the same noise. I've been wondering about this for years. Anybody know what gives?"

2 of 236 comments (clear)

  1. Charge! by Anonymous Coward · · Score: -1, Offtopic

    Anybody notice some ATM's play "Charge" (the bugle call) as they dispense money? (The mechanism coincidentally hums in the proper pitch and rhythm.)

  2. Re:Just wait a while... by Anonymous Coward · · Score: -1, Offtopic

    It isn't just politically incorrect, it's insulting. Parse it out: $characteristic is property of $class $characteristic has method $effect therefore $class has $effect Now, plug in the following characteristics: Drunk Stingy Smelly Immoral Stupid and the following classes Irish Blacks Indians Jews and the following methods losehearing cheat steal fail takejobs If you generalize your statement, you'll see that it's a lot worse than merely "politically incorrect." For the record, I'm Irish and English, and I drink less than nearly anyone I know (about four or five drinks a year); the only drinkers in my family are English.