Signalwave , also known as Broken Transmission , is an underground subgenre of Vaporwave that is characterized by its use of short soundbites and samples taken from old television and radio broadcasts. The aesthetic aims to simulate the experience of "channel surfing" or tuning into a forgotten, distant transmission, creating a mysterious sense of nostalgia.

Unlike other Vaporwave subgenres that often rework samples into new musical compositions, Signalwave frequently presents its source material in a more fragmented and raw state. The result is a soundscape that prioritizes atmosphere and texture over melody, evoking the feeling of stumbling upon a piece of lost media from a bygone era.

Signalwave emerged in the early 2010s from the more experimental side of the Vaporwave scene, alongside the development of the broader genre. Early pioneers began to focus less on sampling smooth jazz or pop music and more on the ambient and incidental sounds of broadcast media. Foundational releases from artists like Midnight Television (2011) and Infinity Frequencies (2012) established the genre's focus on looping, lo-fi samples to create a detached, eerie atmosphere.

Vektroid's 2011 EP Prism Genesis (released under the alias Fuji Grid TV) is also considered a highly influential and formative work. Its chaotic collage of television commercials and jingles, cut up and distorted, provided a blueprint for the "broken transmission" style. The term "Signalwave" itself gained traction as a way to describe this specific niche, which became particularly popular for its ability to evoke a potent, almost universal sense of nostalgia, even for media the listener had never personally experienced.

The visual style of Signalwave is a direct extension of its sound. Album art almost exclusively consists of a single, often low-quality screencap taken from a VHS recording of an old television broadcast. The images are typically mundane (a news anchor, a commercial set, a weather map, or a station's sign-off screen) but are rendered uncanny and mysterious through the degradation of the media and their detachment from their original context. The visuals are not meant to be polished, but rather to look like a frozen moment from a forgotten tape, perfectly complementing the music's nostalgic and liminal quality.

The sound of Signalwave is defined by its source material and its specific manipulation techniques. The music is built almost entirely from samples of dated broadcast media, including television commercials, radio jingles, news bumpers, public service announcements, and weather channel background music.

These samples are typically short, lo-fi, and are repeated in a hypnotic loop with very little variation. Artists often embrace the imperfections of the source audio, incorporating static, hiss, and tape warble to create an aged aesthetic. While effects like reverb and delay are sometimes used to create a dreamy atmosphere, the focus is less on creating a new song and more on preserving the feeling of a fragmented, distant broadcast that is fading in and out of reception.