How can sound be recorded into physical and digital media, what sorcery is this? (lemmy.world)

submitted 7 months ago by cheese_greater@lemmy.world to c/asklemmy@lemmy.world

35 comments fedilink hide all child comments

Also: can mp3s be totally represented as a text file?

you are viewing a single comment's thread
view the rest of the comments

[-] mvirts@lemmy.world 27 points 7 months ago* (last edited 7 months ago)

The nyquist shannon sampling theorem is the idea that as long as you capture 'samples' of signal (like the air pressure over time that is sound) faster that twice the period of the highest frequency component of the signal, all the information is captured and the aignal can be reproduced exactly (in theory).

maybe think of it like looking through a fence. As long as nothing on the other side of the fence is shorter than the spacing between posts, you can everything on the other side.

note that any file can be encoded as text with something like Base64

[-] intensely_human@lemm.ee 8 points 7 months ago

This does involve a cutoff point in the “maximum” frequency of a signal. Actual sound contains a much larger frequency spectrum than our audio file formats are designed to handle.

[-] SturgiesYrFase@lemmy.ml 7 points 7 months ago

Actual sound also contains a larger frequency spectrum than our ears are designed to handle. Not throwing shade, our audio file formats also contain a narrower frequency spectrum than we can hear generally speaking.

[-] intensely_human@lemm.ee 2 points 7 months ago

I speak incompletely because I expect others to argue and complete the conversation. No shade perceived at all.

[-] Strykker@programming.dev 4 points 7 months ago

Sure but human hearing tends to cap out at around 24khz so a sample rate of 48khz is going to contain everything that we can hear.

[-] intensely_human@lemm.ee 1 points 7 months ago

Tends to, key word. Some are outliers in every dimension, including maximum perceptible frequency.

[-] Aecosthedark@lemmy.world 2 points 7 months ago

I love the fence analogy.

this post was submitted on 07 Mar 2024

49 points (84.5% liked)

Ask Lemmy

26350 readers

692 users here now

A Fediverse community for open-ended, thought provoking questions

Rules: (interactive)

1) Be nice and; have fun

Doxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them

2) All posts must end with a '?'

This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?

3) No spam

Please do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.

4) NSFW is okay, within reason

Just remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either !asklemmyafterdark@lemmy.world or !asklemmynsfw@lemmynsfw.com. NSFW comments should be restricted to posts tagged [NSFW].

5) This is not a support community.

It is not a place for 'how do I?', type questions. If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email info@lemmy.world. For other questions check our partnered communities list, or use the search function.

Reminder: The terms of service apply here too.