commit: 3554e32c90993b646156831874bbae37b917a273
parent 0423542cf225a23f13028e785cd07abb36021364
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date: Mon, 4 Mar 2024 11:01:20 +0100
notes/magnitudes: new
Diffstat:
1 file changed, 37 insertions(+), 0 deletions(-)
diff --git a/notes/magnitudes.xhtml b/notes/magnitudes.xhtml
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+<!--#include file="/templates/head.shtml" -->
+ <title>Orders of Magnitudes — lanodan’s cyber-home</title>
+ </head>
+ <body>
+<!--#include file="/templates/en/nav.shtml" -->
+ <main>
+ <h1>Orders of Magnitudes</h1>
+ <p>All of them based on reviewable math, no averages based on sample data where a bias could be introduced or the worst case scenario forgotten.</p>
+ <h2 id="notations">notations</h2>
+ <dl>
+ <dt>kb/Mb/Gb/Tb/…</dt><dd>SI prefixes (per-1000) for bits</dd>
+ <dt>kib/Mib/Gib/Tib/…</dt><dd>IEC prefixes (per-1024) for bits</dd>
+ <dt>kB/MB/GB/TB/…</dt><dd>SI prefixes (per-1000) for 8-bit bytes aka. octets</dd>
+ <dt>kiB/MiB/GiB/TiB/…</dt><dd>IEC prefixes (per-1024) for 8-bit bytes aka. octets</dd>
+ </dl>
+
+ <h2 id="audio">Audio bandwith</h2>
+ <dl>
+ <dt>PCM, CD Quality (16-bit @ 44.1 kHz), no compression</dt>
+ <dd><code>
+ 16 bit × 44100 Hz = 705600 bps = <strong>705.6 kbps</strong>;<br />
+ 705600 bps × 60 seconds = 42336000 bits-per-minute = <strong>42.336 Mb/minute</strong>
+ </code></dd>
+ </dl>
+
+ <h2 id="image">Image filesizes</h2>
+ <dl>
+ <dt>FullHD, True Color (24-bit), no compression, no color-indexing</dt>
+ <dd><code>(1920 × 1080 × 24 bit)/8 = 6220800 octets ≈ <strong>5.93 MiB</strong></code>. A file header of say 16 octets (4 octets each for: magic/signature, codec, height, width) being negligible at this magnitude.</dd>
+ </dl>
+ </main>
+<!--#include file="/templates/en/footer.shtml" -->
+ </body>
+</html>
