the_beber

@the_beber@feddit.org

• ⁨Comment⁩ on ⁨You need to lock in⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  The (effective) low-pass is only applied after the signals have been multiplied. This filters out the signal with the same frequency (and phase) as the reference. I have a more detailed comment on how this works in response to another person here in this comment section. This is useful for applications, where the signal can be drowned out by the noise, but you know what to look for, and where the phase information is important. (e. g. a DC signal that is chopped at a selected frequency or an AM-signal).

• ⁨Comment⁩ on ⁨You need to lock in⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  The device, I‘m referencung here is called a lock-in amplifier. When you try to measure an extremly noisy signal without all the noise, you can use one of these. If you‘re dealing with a DC-signal, you can chop it at the reference frequency.

  Here‘s a great write up on the priciples of this technique: zhinst.com/…/zi_whitepaper_principles_of_lock-in_…

  But TLDR: After the reference signal is adjusted to have same frequency (and therefore constant phase difference), you get a signal that oscillates with ω_\text{in} - ω_\text{ref} and ω_\text{in} + ω_\text{ref}. Crucially, in the case, where ω_\text{in} = ω_\text{ref} the term becomes constant U(t) = U_0 |e^{i \theta}| while the other terms from other frequency components (Fourier-series) still oscillate. This is where the averaging comes in. An oscillating signal will average (roughly) 0 over a long enough duration. The output is then the amplitude of the desired signal without all the noise.

• ⁨Comment⁩ on ⁨You need to lock in⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  Oh no… I just noticed an additional “ whoever finds it, can keep it (or make their own perfect version).

• You need to lock infeddit.org ↗
  Submitted ⁨⁨2⁩ ⁨weeks⁩ ago⁩ to ⁨science_memes@mander.xyz⁩ | ⁨7⁩ ⁨comments⁩
• ⁨Comment⁩ on ⁨Taste the flavor⁩ ⁨⁨1⁩ ⁨month⁩ ago⁩:

  Well… it‘s also killing humans, so… plan worked ig?

• ⁨Comment⁩ on ⁨obesity even kills stars, but the bigger they are, they shine brighter too⁩ ⁨⁨1⁩ ⁨month⁩ ago⁩:

  And most of it will never even be used up.

• ⁨Comment⁩ on ⁨can you?⁩ ⁨⁨1⁩ ⁨month⁩ ago⁩:

  Image

• ⁨Comment⁩ on ⁨Just like in the movies.⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  That means, you‘re a BIG SHOT.

• ⁨Comment⁩ on ⁨[deleted]⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  wth is going on Tuesday and Friday?

• ⁨Comment⁩ on ⁨walter⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  Ah, a classic

• ⁨Comment⁩ on ⁨gotta blast!⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  Oh the duality!

• ⁨Comment⁩ on ⁨Watching the news can be dangerous ⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  You mean this guy?

  Image

• ⁨Comment⁩ on ⁨Well thanks⁩ ⁨⁨7⁩ ⁨months⁩ ago⁩:

  un un un

• ⁨Comment⁩ on ⁨Google AI strikes again⁩ ⁨⁨7⁩ ⁨months⁩ ago⁩:

  I fear, that‘s ob you buddy. The bird ypu meant wasn‘t bold but bald eagle.

• ⁨Comment⁩ on ⁨Please tell me⁩ ⁨⁨7⁩ ⁨months⁩ ago⁩:

  Everyone who died had water in them. Really makes you think…

• ⁨Comment⁩ on ⁨The havoc is often trigger happy⁩ ⁨⁨8⁩ ⁨months⁩ ago⁩:

  Look like loading screen tips.

• ⁨Comment⁩ on ⁨literature⁩ ⁨⁨8⁩ ⁨months⁩ ago⁩:

  Instead of „shop now“ I read „slop now“. Definitely a fitting misread.

• ⁨Comment⁩ on ⁨Meta AI⁩ ⁨⁨8⁩ ⁨months⁩ ago⁩:

  I hate that you can‘t turn this shit off in WhatsApp (I also hate, that I have to use WhatsApp in general).

• ⁨Comment⁩ on ⁨Look out bugs bunny here comes⁩ ⁨⁨8⁩ ⁨months⁩ ago⁩:

  Something‘s bugging me about this one…