A glitch box, or video glitch device, is a piece of hardware designed to intentionally introduce glitches, distortions, and artifacts into video signals. These devices are used in creative and artistic contexts — video art, experimental filmmaking, and live visual performances. The goal is to manipulate and distort the video signal in unpredictable and visually interesting ways.
How They Work
Glitch boxes typically work by modifying the electrical characteristics of older devices such as video enhancers, mixers, titlers, and sketch pads. The practice of modifying electrical circuits like this is called circuit bending. Circuit benders explore the electronic circuits within devices to identify points where modifications can be made — usually involving adding switches, potentiometers (variable resistors), or other components to alter the device’s behavior.
Circuit-bending a video device may introduce interference, voltage fluctuations, or other disruptions to a video signal, leading to visual distortions such as color shifts, horizontal/vertical lines, rolling screens, stuttering images, pixelation, and other artifacts.
Signal Types
Glitch boxes most commonly deal with composite video signals (those yellow RCA cables). Composite video is analog, which maintains stability during glitching better than digital signals. However, some newer glitch devices can process HDMI signals, producing visually unique digital artifacts.
Output & Display
A glitch box usually works best when outputting to a CRT television or monitor. CRTs handle signals continuously, allowing for more nuanced signal manipulation. They’re also susceptible to electromagnetic interference, which can be intentionally exploited. You can also record output directly to a computer via USB capture cards, though digital capture may drop the signal during extreme glitching.
Common Features
- Audio reactivity — sync glitch effects to incoming audio
- Modularity — combine interchangeable modules in Eurorack format
- Semi-modular — built-in patch points without fully swappable modules