PM_ME_VINTAGE_30S

PM_ME_VINTAGE_30S, 9 days ago

Going to bars. I can’t drink with my medications and I don’t like going to loud, social places unless there’s some other reason to be there.

PM_ME_VINTAGE_30S, 11 days ago

I can poop on the floor. But I bet you can too.

PM_ME_VINTAGE_30S, 11 days ago

Digital signal processing

PM_ME_VINTAGE_30S, 11 days ago (edited 8 days ago)

DSP (digital signal processing) is the field of applied mathematics and engineering dedicated to transforming and manipulating digital signals.

Examples of real digital signals include audio files, image files, video files, and digitized recordings of various physical quantities by computers like the configuration of a robot as it moves in time, measurements of the processes in a factory, the trajectory of a spacecraft — almost anything that can be periodically sampled and take on a finite set of values [1] can be seen as a digital signal.

DSP includes using tools like the Discrete Fourier Transform (DFT), the Z-transform, wavelet analysis, probability, statistics, and linear algebra to do things such as filter a signal (example: audio equalizer), predict future values (example: weather forecasting), data compression (example: JPEGs), system identification (example: fit a model of the earth to predict seismic activity), control (example: make a DC motor to respond to position commands), and stabilization (example: keep plane from “wanting” to smash into the ground). Particularly, it requires a careful consideration of the effect of sampling a signal (example: if done carelessly, you can make the sampled system unstable [read: explode]), as well as an interpolation process of some kind if you plan on using that signal outside your computer (example: you want to hear an audio signal stored on your computer).

I got into DSP because I was an audio engineer and musician [2], and I wanted to design my own audio plugins. IMO I think almost everyone would benefit from some knowledge of DSP, but the math is really intense. Personally, I found out late in life that I have a nearly infinite appetite for math, so it’s a good fit for me.

Here’s a playlist about DSP if you’re interested.

[1] Actually, a lot of basic DSP books don’t restrict the signal to be in a finite set because it makes the math easier if the signal could be any real number. However, certain structures that would be exactly equivalent in theory are not equivalent on a real computer because ordinary computer arithmetic is approximate.

[2] I still play music, but not as much as before engineering school.

PM_ME_VINTAGE_30S, 11 days ago

Desperately needs more upvotes

PM_ME_VINTAGE_30S, 11 days ago

*moving, not motion.

PM_ME_VINTAGE_30S, 11 days ago

Broke: not farting in the office

Woke: farting in the office

Bespoke: sharting in the office

PM_ME_VINTAGE_30S, 13 days ago

Why tf is this being downvoted here? 🖕 to liberals.

PM_ME_VINTAGE_30S, 13 days ago (edited 10 days ago)

Check out LibertyHub @ lemmy.blahaj.zone. Zero tolerance for liberal bullshit over there.

PM_ME_VINTAGE_30S, 13 days ago

No, turtles never even existed, I’ve never seen one. /s

PM_ME_VINTAGE_30S, 14 days ago

I actually designed a (digital) equalizer using an IIR filter this semester, which actually does theoretically work on sequences of numbers, which constitutes an infinite dimensional vector space. The actual math was just algebra and programming, but it was an implementation of a Z-transform transfer function which is a sequence operator (maps input sequence to output sequence).

IMO infinite-dimensional stuff shows up in two types of problems:

1. For some reason, you need to solve the partial differential equation you started with, i.e. you can’t use symmetry or approximations to simplify it into an ordinary differential equation.
2. When you’re dealing with signals that change in time or space, you have to decompose those signals into simpler signals that are easier to analyze.

PM_ME_VINTAGE_30S, 13 days ago

Infinite-dimensional vector spaces also show up in another context: functional analysis.

From an engineering perspective, functional analysis is the main mathematical framework behind (1) and (2) in my previous comment. Although they didn’t teach functional analysis for real in any of my coursework, I kinda picked up that it was going to be an important topic for what I want to do when I kept seeing textbooks for it cited in PDE and “signals and systems” books. I’ve been learning it on my own since I finished Calc III like four years ago.

Such an incredibly interesting and deep topic IMO.

PM_ME_VINTAGE_30S, 16 days ago (edited 11 days ago)

If your signal looks like f(t) = K•u(t)e^at with u(t) = {1 if t≥0, 0 else}:

• If Real(a) > 0, then your signal will eventually blow up.
• If Real(a) < 0, then you signal will not blow up. In fact, your signal will have a maximum absolute value of |K|, and it will approach zero as time goes on.
• If Real(a) = 0, it is either a complex sinusoid or a constant. In either case, it is bounded with maximum absolute value of |K|. It very much does not blow up.

So e pops up all the time in stable systems and bounded signals because the function e^at solves the common differential equation dx/dt = ax(t) with x(0)=1 regardless of the value of a, particularly regardless of whether or not the real part of a causes the solution to blow up.

PM_ME_VINTAGE_30S, 17 days ago

IMO LyX is way simpler than LaTeX for basic stuff, but because it is literally not Microsoft Word I couldn’t really use it to collaborate with people this semester, let alone convince them to work on a full LaTeX document. LyX would be the way to go if my colleagues were even remotely interested in learning about literally anything. You can lead a horse to water, but you can’t make it drink…

PM_ME_VINTAGE_30S, 17 days ago (edited 12 days ago)

some wysiwyg editor for LaTeX

LyX is basically that.

PM_ME_VINTAGE_30S, 17 days ago

Do most people generally eat the same things all the time?

Yeah. IMO variety is expensive because it’s usually cheaper to buy a few things in bulk.

consulting a professional before doing so.

I consulted a nutritionist before doing my first weight loss [1] because I wanted to make sure my diet was nutritionally sound. Surprisingly, it was fine, just too much of everything. Very surprising considering that I’m a picky eater with texture issues, but I’ll take it.

In contrast, my sister had to see a nutritionist to go on hormones and apparently her diet was nutritionally whack, so she had to make a bunch of changes.

vegetables

Please God no (at least not raw)

[1] I put it back on when I went to engineering school, but I managed to keep it off for a couple years. Oh well. I’ll get around to losing it again soon.

PM_ME_VINTAGE_30S, 17 days ago

I don’t judge anyone by their weight, but it’s sure hard to direct that same acceptance toward myself.

Yeah same here, but I’m at a weight where I’m exceeding weight limits of things like ladders, furniture, etc. And I’m in terrible physical shape on top of all that. It’s really more of a “tactical” thing for me at this point. Just gotta get it done.

Sounds like you’re doing well, though.

Thank you. Could be better, could be a lot worse. I’m still a social disaster.

And I make my own frozen meals

Me too. The other day I made like half my meals for the entire summer in one giant cook.

PM_ME_VINTAGE_30S, 17 days ago (edited 12 days ago)

I’m just a 12-inch 60 watt guitar loudspeaker with tailored mid-range frequency response primarily used to record metal trying to find other guitar loudspeakers with tailored mid-range frequency responses primarily used to record metal

celestion-vintage-30-25th-anniversary-16-ohms-210605

PM_ME_VINTAGE_30S, 19 days ago (edited 13 days ago)

I know a lot of loony leftists are saying things like “this is a violation of international law”

Shitlibs in a nutshell

Edit: Okay thank goodness you’re being sarcastic.

PM_ME_VINTAGE_30S, 19 days ago (edited 13 days ago)

I don’t know how I can make the sarcasm any more obvious.

I mean you could have put the /s at the end. I’m not that good at detecting sarcasm in text.

But also… shitlibs will actually say stuff like this unironically.

PM_ME_VINTAGE_30S, 19 days ago (edited 13 days ago)

Yeah they might, they’ll just lie to you and/or themselves about the reality of how it happened. But fair point.

PM_ME_VINTAGE_30S, 19 days ago

get π million dollars and get +3 on all charm. This would actually help me dramatically.

PM_ME_VINTAGE_30S, 19 days ago

way more than $π million.

I don’t need more than $π million. I just need enough to get some stuff started. I’m not interested in getting rich.

I would also use the first loop to take medical tests of my health as much as possible since it wouldn’t matter if I went into debt in the first loop.

Fair enough, but I really need the charm. I’m autistic and I’m not good at being social. I’d definitely be willing to give up a few years of life for more charm.

PM_ME_VINTAGE_30S, 19 days ago

C

PM_ME_VINTAGE_30S, 21 days ago

Actually Sonic I am frying chicken