this post was submitted on 03 Apr 2025
1966 points (99.2% liked)

Science Memes

14039 readers
3462 users here now

Welcome to c/science_memes @ Mander.xyz!

A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.



Rules

  1. Don't throw mud. Behave like an intellectual and remember the human.
  2. Keep it rooted (on topic).
  3. No spam.
  4. Infographics welcome, get schooled.

This is a science community. We use the Dawkins definition of meme.



Research Committee

Other Mander Communities

Science and Research

Biology and Life Sciences

Physical Sciences

Humanities and Social Sciences

Practical and Applied Sciences

Memes

Miscellaneous

founded 2 years ago
MODERATORS
 
you are viewing a single comment's thread
view the rest of the comments
[–] captain_aggravated@sh.itjust.works 51 points 2 days ago (3 children)

Reminds me a little of CD digital audio. The original Red Book audio standard hasn't really been improved upon because it's uncompressed audio which covers basically all of the range of human hearing within the capabilities of any speaker we could build. It's uncompressed because in the early 80's when the tech hit the market, it was completely unfeasible to include the CPU and RAM needed to decompress audio in real time.

Shrimp has more color receptors because he doesn't have enough neurons to run trichromacy, so he sees in EGA.

[–] gabereal@sopuli.xyz 31 points 2 days ago (1 children)

Shrimp has more color receptors because he doesn’t have enough neurons to run trichromacy, so he sees in EGA.

love this. nice job :)

VGA vs EGA, from the game 'Police Quest 3'

[–] jballs@sh.itjust.works 20 points 2 days ago (1 children)

I remember experiencing the EGA to VGA graphics evolution when I was growing up. I remember thinking the VGA almost seemed too real.

In my mind, this was a game that felt like it was pretend:

But this felt entirely too real:

[–] WhiskyTangoFoxtrot@lemmy.world 2 points 2 days ago (1 children)

Have you played The Crimson Diamond? EGA is back, baby!

[–] jballs@sh.itjust.works 1 points 2 days ago

If you love the old murder mystery games like the Laura Bow Mystery Series, you will enjoy this game

Oh man, I had completely forgotten about the old Laura Bow games! Might have to check this out!

[–] null_dot@lemmy.dbzer0.com 9 points 2 days ago (1 children)

Oh man.

12 year old me waiting for hours to rip mp3s from cds always wondered about this.

Like why isn't it already compressed?

The answer is that storage was available but processing wasn't. Amaze.

[–] T156@lemmy.world -5 points 2 days ago (1 children)

Mp3 is already compressed, as is the MP2 CDs use.

If it wasn't conpressed, you'd be looking at CDs per track, instead of tracks per CD.

[–] deltapi@lemmy.world 14 points 2 days ago* (last edited 2 days ago) (2 children)

What are you on about? CD-DA, aka audio CD, aka red book audio, is uncompressed 16-bit PCM sampled at 44100Hz. It is lossless.

MP3 (MPEG-1/2 Audio Layer III) is a lossy encoding standard commonly used for online audio distribution and steaming. MP2 usually refers to MPEG-1 Audio Layer 2, which was most commonly used in Digital Audio Broadcast.

Neither are used in 'regular' CD audio.

[–] SaharaMaleikuhm@feddit.org 2 points 2 days ago (2 children)

I'd like to subscribe to the format facts newsletter. Can you do VHS next?

The round hole in the middle of the cassette near the tape path is designed to have a light bulb on a stick inserted into it.

Most of the tape is (approximately) opaque due to the magnetic recording media, but the very ends are transparent. If you open the cassette's lid and look at the uncovered ends of the cassette, you'll see a hole on each end that has a path through the cartridge to the light bulb hole, only interrupted by the tape itself. Photoreceptors in the VCR sit just outside those holes, and if light is detected it means that the clear leader is starting to unwind from the spool meaning the tape is over, so this is how the VCR knows to stop the tape. This is why so many VCRs and rewinders glow inside.

Later hardware swapped it for an infrared LED and detectors but still did the job optically.

Each frame of video on VHS actually occupies a diagonal section of the tape. That allows the width of the tape to be effectively longer which means it can store more information. It's also why the image will jitter a bit when the tape is paused since there's multiple frames of data under the read head at any given time.

It is lossless.

I'm not sure that's the right word for uncompressed digital audio, because it's lossless compared to what? Presumably an analog recording or the original input signal? Because Shannon-Nyquist, with CD audio you can't get anything higher than what? 16kHz out of it, but within that limitation you can reproduce any arbitrary waveform within a speaker's ability to produce given the laws of physics regarding inductance and inertia.

MP3 does use a lossy compression, but you can maintain listenable quality while cramming about 10 times as much audio into a given space. You can get just over an hour of Red Book audio on a CD, and about 11 hours of mp3s, give or take. You might get lower audio bandwidth or various kinds of artifacts but it'll still sound pretty good, it's way more practical to store and transmit over the internet. We didn't Napster no .wav files.

FLAC and similar formats use lossless compression, kind of like a .zip file. If you rip a CD to FLAC, and you were to then burn a CD from that FLAC, the data on the new CD would be identical to the old one. So you get as-perfect-as-we-can-do digital audio, but only 5 or 6 hours worth would fit on a CD. Someone somewhere on this earth has filled a compact disc with FLAC files, I'm sure.

[–] humanspiral@lemmy.ca 3 points 2 days ago

Is moral of your story that adults having frequency detection limited to 16khz, with older adults lower, might still be able to detect music well enough?