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==Lighting==
==Light-up displays ==
===Eggcrate display===
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An eggcrate display is a number of often-incandescent, often-smallish lighbulbs in a grid (often 5 by 7),
named for the pattern of round cutouts
These were bright, and primarily used in gameshows, presumably because they would show up fine even in bright studio lighting.
Note that when showing $0123456789, not all bulbs positions are necessary.
-->
===Nixie tubes===
===Nixie tubes===
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https://en.wikipedia.org/wiki/Dekatron
https://en.wikipedia.org/wiki/Dekatron
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===Eggcrate display===
<!--
An eggcrate display is a number of often-incandescent, often-smallish lighbulbs in a grid (often 5 by 7),
named for the pattern of round cutouts
These were bright, and primarily used in gameshows, presumably because they would show up fine even in bright studio lighting.
Note that when showing $0123456789, not all bulbs positions are necessary.
-->
-->
The physical and human spects dealing with audio, video, and images
Vision and color perception : objectively describing color · the eyes and the brain · physics, numbers, and (non)linearity · color spaces · references, links, and unsorted stuff
Image : file formats
· noise reduction
· halftoning, dithering
· illuminant correction
· Image descriptors
· Reverse image search
· image feature and contour detection
· OCR
· Image - unsorted
Video : file format notes · video encoding notes · On display speed · Screen tearing and vsync
Simpler display types · Video display notes · Display DIY
Audio physics and physiology : Sound physics and some human psychoacoustics · Descriptions used for sound and music
Noise stuff : Stray signals and noise · sound-related noise names · electronic non-coupled noise names · electronic coupled noise · ground loop · strategies to avoid coupled noise · Sampling, reproduction, and transmission distortions · (tape) noise reduction
Digital sound and processing :
capture, storage, reproduction · on APIs (and latency) · programming and codecs · some glossary · Audio and signal processing - unsorted stuff
Music electronics :
device voltage and impedance, audio and otherwise ·
amps and speakers ·
basic audio hacks ·
Simple ADCs and DACs ·
digital audio ·
multichannel and surround
On the stage side: microphones · studio and stage notes ·
Effects ·
sync
Electronic music :
Electronic music - musical terms
MIDI · Some history, ways of making noises · Gaming synth · microcontroller synth
Modular synth (eurorack, mostly):
sync · power supply · formats (physical, interconnects)
DAW: Ableton notes · MuLab notes · Mainstage notes
Unsorted : Visuals DIY · Signal analysis, modeling, processing (some audio, some more generic) · Music fingerprinting and identification
For more, see Category:Audio, video, images
Light-up displays
Eggcrate display
Nixie tubes
Dekatron
Mechanical
Mechanical counter
https://en.wikipedia.org/wiki/Mechanical_counter
Split-flap
https://en.wikipedia.org/wiki/Split-flap_display
Vane display
Flip-disc
https://en.wikipedia.org/wiki/Flip-disc_display
Other flipping types
LED segments
7-segment and others
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
7-segment, 9-segment display, 14-segment, and 16-segment display. If meant for numbers will be a dot next to each (also common in general), if meant for time there will be a colon in one position.
These are really just separate lights that happen to be arranged in a useful shape.
Very typically LEDs (with a common cathode or anode), though similar ideas are sometimes implemented in other display types - notably the electromechanical one, and also sometimes VFD.
Even the simplest, 7-segment LED involves a bunch of connectors so are
often driven multiplexed, so only one of them is on at a time.
often done via a controller that handles that multiplexing for you
Seven segments are the minimal and classical case,
good enough to display numbers and so e.g. times, but not really for characters.
More-than-7-segment displays are preferred for that.
https://en.wikipedia.org/wiki/Seven-segment_display