Snooze - varför just 9 minuter?

[Duffman]

Kan någon svara på varför snooze på tex min mobil och på många klockradios är satt till just nio minuter? Hur tänkte de och varför? Nu vill jag att vi kommer med en massa sköna teorier och förklaringar!

[Alfred Nobel]

Jag kan välja 5, 10, 15 minuter eller helt manuellt. t

[Handcuff]

Ursprungligen postat av Duffman

Kan någon svara på varför snooze på tex min mobil och på många klockradios är satt till just nio minuter? Hur tänkte de och varför? Nu vill jag att vi kommer med en massa sköna teorier och förklaringar!

Enkelt! Därför att de första uren med sk. snoozefunktion för massor med år sedan hade ett extra kugghjul för denna funktion. 9 minuter verkar ha varit den optimala tiden då det fanns begränsningar i precissionen på detta extrahjul. Eller nåt sånt. Hörde detta på "våga fråga" RIX FM.

[Duffman]

mina 3 telefoner och en klockradio är default inställda på 9 minuter.

[RassK]

Min är på 8?

[Duffman]

8? wtf..

[Ignatius72]

Ursprungligen postat av RassK

Min är på 8?

Lämna omedelbart tillbaks skräpet!

[Palm]

Ursprungligen postat av Ignatius72

Lämna omedelbart tillbaks skräpet!

[Einar]

Ursprungligen postat av Ignatius72

Lämna omedelbart tillbaks skräpet!

Exakt. Sånt skit kan man inte gå o dras med. Måste vara en norsk väckarklocka.

[Duffman]

Precis, fan vad orättvist att bara ha 8 när de flesta verkar ha 9. Hur klarar man av sånt? haha

[Fatalist]

Det första skämtet på 8-minutersklockan var väl lite sisådär kul. Sen... Ja.

[DarcyGrahn]

Jag har 5 min

[Guccisneakers]

5 även här....

[ahz]

Från http://archives.stupidquestion.net/sq101598alarms.html

Ursprungligen postat av stupidquestions

Stupid Question ™

Oct. 15, 1998

By John Ruch

© 1998



Q: Why are most digital alarm clock snooze times set to nine minutes instead of a round number like five or 10?

—L.H.





A: Clocks made by Zenith, Sony and market leader General Time Corporation have nine-minute snooze times—except for General Time’s new adjustable-snooze clocks, which offer five-, 10- and 20-minute settings.

Most novelty clocks and build-your-own kits are 10 minutes, as are Emerson clocks. Timex is eight minutes. Canon’s CC-90 alarm clock calculator is five minutes. The 1970s Heath Company digital was seven minutes.

Why?

Corporate answers ranged from suspicious (a design mistake) to ludicrous (“five was too short and 10 was too long”) to hostile (Zenith said consumers are too dumb to understand the real answer).

Professor Kim Boyer of Ohio State University’s computer engineering department says the nine-minute snooze is just simpler and cheaper.

Most digital clocks use a vibrating quartz crystal as a timer. A chip slows the vibration down to 1 hertz, or one cycle per second. The clock turns these cycles into digital pulses and counts them as seconds of time (adding them up for minutes, hours and so forth).

If you want the snooze function to wait 10 minutes, you need it to count to 600 seconds (pulses). The catch is that digital circuitry “counts” with binary numbers. In binary, 600 equals 1001011000.

The circuitry to let the counter recognize the number and decode it into decimal takes “a fair amount of space on the chip, when the fact is this is not a very critical timing event,” Boyer said.

So instead, you pick a number of pulses that’s pretty close to 600 and that is also easily read in binary. The closest is 512 pulses, which equals eight minutes and 32 seconds, and which in binary equals 1000000000—a big number, but one that can be recognized simply by waiting for the number in the farthest left column to turn from 0 to 1 for the first time. That takes less analysis and less chip space.

This probably explains the early National Semiconductor clock chips that, in the fine print, said the snooze time was “between eight and nine minutes.” Probably explains Timex, too.

But my own clock goes off exactly nine minutes later. Which leads us to an explanation provided by the reader-answered “Collected Wisdom” column in the Toronto Globe and Mail, which tackled this question in August 1996.

It said the simplest way to run a snooze counter is to tell the alarm to ring again when the last digit in the time (say “9” in 12:09) is one less than it is now (i.e., nine minutes later). If you told it to go off when the last digit is the same, it would go off immediately.

Timex tells me a researcher for “Parade” magazine’s “Ask Marilyn” column recently called with the exact same question. What answer will Marilyn come up with? Time will tell.

[Inzza]

jag har 10 min första snoozen, 5 min andra snoozen, 1 min resten av snoozingarna. grymt faktikst. man kommer antingen upp.. eller stänger av och somnar om aha.