Kit BashirToday I learned that Apple Air Pods Pro in noise cancelling mode perfectly cancels the clicking of a geiger counter. You would not know it was making a sound. I hope that this is not relevant to /your/ day.
allrite@Unixbigot TBF, back in the old days how would you know if it was a Geiger counter or scratched vinyl/tape?
Aaron@allrite @Unixbigot I assume timbre.
@Unixbigot @allrite A click is distinct from noise. I swear I'm not trying to be "well akshully" about this, it's a core memory of my IT career.
The first real datacenter I had access to, first time I was in, was a wall of white noise. Sounded like standing next to Niagara Falls - loud but not quite as deafening. One of the NOC staff was making his rounds, abruptly stopped at one rack and started tapping on a server. "There's a fan going out," he explained. "I can hear it clicking." I was dumbfounded.
About a year and countless hours later in that same room of white noise, I had a crash cart attached to a server, waiting for it to boot. Waited ten, fifteen minutes - abnormally long, wouldn't go just hung on BIOS. Then I heard it: a drive clicking, trying to spin up, but unable to. Watched the activity lights for a bit, pulled the stuck drive, and it booted immediately. OS complained it was missing a disk - of course, one failed! But I literally heard it failing in the wall of noise.
The first real datacenter I had access to, first time I was in, was a wall of white noise. Sounded like standing next to Niagara Falls - loud but not quite as deafening. One of the NOC staff was making his rounds, abruptly stopped at one rack and started tapping on a server. "There's a fan going out," he explained. "I can hear it clicking." I was dumbfounded.
About a year and countless hours later in that same room of white noise, I had a crash cart attached to a server, waiting for it to boot. Waited ten, fifteen minutes - abnormally long, wouldn't go just hung on BIOS. Then I heard it: a drive clicking, trying to spin up, but unable to. Watched the activity lights for a bit, pulled the stuck drive, and it booted immediately. OS complained it was missing a disk - of course, one failed! But I literally heard it failing in the wall of noise.
Andrew@aaron @Unixbigot @allrite noise has a Fourier Transform thats a constant, a repeating click has a Fourier Transform thats a Dirac comb.
Roadskater, Ph.D.@aaron @Unixbigot @cinebox @allrite All I want to know is, did you people used to mark your music CDs with a green El Marko pen, because it sounded better that way?
AJCxZ0
Alexander The 1st@Unixbigot @cinebox @aaron @allrite Well now I'm imagining noise cancelling headphones that have a "Noise Sampler" step to sample the ambient noise over a user-defined period of time, and then have it specifically try to cancel nosies in that specific sample.
Barry Schwartz 🫖@Unixbigot @cinebox @aaron @allrite For noise cancellation what matters is that it be external to the headphones and easily predictable by a simple sampling method.
And it is "noise" in the technical sense of being "additive noise"—that is, it is something that needs to be subtracted from the received signal to recover the original signal.
So there. :)
I don't know what methods they are using these days. Probably stuff like maximum entropy just as in decades past.
Alex von Kitchen
LR
NullNoMore
🍂Evan Balster🍂@lritter @cinebox @aaron @Unixbigot @allrite
Over an infinite timespan, the fourier spectrum will be the same for white noise as it will be for sparse random impulses. The distribution of sample values doesn't matter, even if 99% are zeroes; only that they are uncorrelated across time.
A comb-shaped spectrum corresponds to a train of pulses spaced at regular intervals, but an uncorrelated process like radioactive decay will create a flat spectrum.
Andre@aaron @Unixbigot @allrite Site sysadmins can hear the death-click of a drive from a long way away. And also known then picld has been disabled by a stupid 'security' script on one daktari in a 12 rack suite.
Weedkiller@aaron I can relate to this. I studied a bunch of electroacoustic music composition at uni, and the “what is noise” question has at least as many subjective and contradictory answers as “what is music”.
Steven Sandoval@aaron @Unixbigot @allrite That's how I imagine getting direct neural implants will feel like: noise until my nervous system learns to interpret the new signals.
AzureArmageddon@baltakatei @aaron @Unixbigot @allrite We may yet learn what it's like for a baby's brain to compile drivers for all their body parts in real time.
Luka Rubinjoni@Unixbigot @aaron @allrite It's not a Geiger counter if it doesn't detect ionization events with a self amplifying avalanche in a Geiger tube. Otherwise, it's just a (sparkling /edit/) ionization chamber. (spirals into a flame war about proportional detectors)
@Unixbigot @aaron @allrite Perfect! (there's also a spark chamber joke somewhere here, but it needs work...)
S0N1C@Unixbigot
yes! Eberline clicks > Ludlum clicks :)
yes! Eberline clicks > Ludlum clicks :)
Billy Smith@funranium might know... :D
furranium@BillySmith @Unixbigot @aaron @allrite Why, I got to discuss being an aficionado of fine clicks, ticks, and beeps just the other day. There is no official "this emission must make this sound" but I have noticed a tendency for certain commonality in sound for certain detector types across manufactures. I suspect convergent evolution in the marketplace for customer expectation.
@funranium @BillySmith @aaron @allrite perhaps making the sound of clicking their claws together is sensor equipment trying to evolve into crabs…
mathew@allrite @Unixbigot A serious problem with my original copy of Kraftwerk's "Radio-Activity".