[Column] Bit crush and low-bit music: the aesthetics of sound created by digital resolution
Column en Chiptune Glitch Sound Design![[Column] Bit crush and low-bit music: the aesthetics of sound created by digital resolution](/../assets/images/column-bit-crush-low-bit.webp)
Prologue: Why did we accept the “deterioration” of sound as beauty?
Text: mmr｜Theme: Digital distortion has changed music–About the technical history and aesthetics of bit crush and low-bit music
The history of digital music is often talked about as a history of high-quality sound. Sampling frequencies have increased, bit depth has been extended, and noise has been eliminated. However, on the other hand, expressions that intentionally lower the resolution have repeatedly appeared. Words like bit crush, low bit music, and 8bit/12bit sound technically mean ““limitation” or ““deficiency,” but in music history they have formed a distinct aesthetic and culture.
In this column, we will analyze the relationship between bit depth and sound, the limitations of early digital devices, and the flow that led to game consoles, samplers, and DAWs, and interpret the accumulation of facts as to why low-resolution sound became a form of musical expression.
Digital music has always encompassed both ““enhancing” and ““destructing” at the same time.
Fundamentals of Digital Sound: What Bit Depth and Sampling Mean
What is bit depth?
Bit depth is an index that indicates how many levels the amplitude of sound can be expressed. If it is 16bit, there are 65,536 levels, and if it is 8bit, there are only 256 levels. The smaller the number of stages, the rougher the volume change, and the more noticeable quantization noise appears.
Low bit depths were common in early digital audio equipment due to cost and processing power limitations. This was a design necessity and was not intended.
Low bit sound first existed as an ““inevitable constraint.’’
Relationship with sampling frequency
The sampling frequency is the resolution on the time axis, and the bit depth is the resolution on the amplitude axis. If either one is low, the sound will be rough. However, especially when the bit depth decreases, distortion is more likely to be perceived as timbre.
Unlike analog distortion, this distortion has a discontinuous and hard texture. This gave rise to a characteristic that would later be called ““digital sound.’’
Digital distortion gives the timbre itself a mathematical contour.
Birth of early digital equipment and low-bit sound
Digital constraints in the 1970s and 1980s
From the late 1970s to the early 1980s, digital sound sources were limited to research institutions and expensive business machines. For home and commercial devices, memory capacity, computing power, and cost were major constraints, and as a result, low bits and low sample rates were chosen.
Rather than sacrificing sound quality, this was a compromise to make it work.
Low-bit sound was born as a byproduct of design philosophy.
Game console and sound chip
Family computers, arcade boards, and 8-bit and 16-bit generation game consoles had extremely limited sound source specifications. The composition of square waves, triangle waves, noise, and simple sample playback gave it a distinctly digital tone.
This sound was considered ““for children” and ““simple,” but at the same time it became deeply engraved in generational memory.
Game music was the biggest medium that allowed low-bit sounds to permeate everyday life.
Culturalization of low-bit music: From constraints to style
The establishment of chiptune
In the late 1990s, music that intentionally used sound sources from game consoles and old computers came to be called “chip tunes.” This was not a nostalgic hobby, but involved a clear methodology of composing within a limited number of notes and timbres.
Low-bit sound is not just a matter of sound quality, but has become an element that defines the structure itself.
Restrictions have been transformed into rules for composition.
DIY culture and online distribution
The spread of the Internet has rapidly democratized music production tools and distribution. With the advent of emulators, tracker software, and simple synths, low-bit music is leaving the realm of experts.
This trend also connected with later lo-fi-oriented music and indie music.
Low-resolution sound has entered the high-resolution distribution network.
Operation called bit crush
Definition of bit crush
Bit crushing is a process of intentionally lowering the bit depth of an audio signal. This can be implemented in hardware or software, and is also used as real-time processing.
The resulting quantization noise, step-like volume changes, creates a characteristic harshness.
Bitcrash is not a “reproduction” but a “manipulation”.
Establishment as an effect
Since the late 1990s, bit crushers have been installed in DAWs and multi-effects devices. This was a decisive change that positioned low-bit tones as ““selectable tones.’’
Low resolution will no longer be treated as a constraint, but as a means of expression.
Degradation saved as preset.
Glitch, IDM, and its impact on electronic music
Contingency and digital noise
Phenomena such as CD reading errors, data corruption, and processing failures should have been eliminated. However, some electronic musicians begin to treat this as a sound material.
Low-bit noise and glitches have in common that they both assume digital imperfection.
Digital no longer needs to be perfect.
IDM and acoustic aesthetics
In the context known as IDM, the texture of the sound itself was emphasized as a compositional element. Bit crushing played a role in shaping texture more than rhythm and melody.
Low bit sounds are like brush strokes in abstract music.
Resolution gave an axis of expression different from emotion.
Modern low-bit representation
Hardware Revival
In recent years, 8bit/12bit samplers and lo-fi oriented sound sources have been reevaluated. This is not just nostalgia; it is because the music production environment has become so high-resolution that the opposite direction has become a clear option.
Low sound quality is chosen precisely because we live in an era of high sound quality.
Application to videos, games, and advertising
Low-bit tones are used as symbols that instantly convey a sense of nostalgia, artificiality, and unreality. Even short sounds can evoke context, so they go well with images and UI sounds.
Low-pitched sounds have become sounds that carry meaning.
Chronology: History of low bit music and bit crush
Low-bit sound has always existed at the intersection of technology and culture.
Structure diagram: Relationship between bit depth and sound
Numerical reduction can create musical meaning.
Final chapter: The idea of choosing resolution
Bit crush and low bit music are more than just sound effects or genres. It is a matter of choosing how precisely to present sound to the world.
As technology advances, limits are no longer imposed from outside. That’s why the act of intentionally lowering resolution involves a clear ideology.
Low bits are not a relic of the past. It is an aesthetic that will only come to fruition once digital music has matured.
Choosing the resolution of sound is equivalent to choosing the position of expression.
