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Concept
Chiptune
Summary
Chiptune (also known as chip music, 8-bit music, or 16-bit music) is a style of synthesized electronic music made using the programmable sound generator (PSG) sound chips or synthesizers in vintage arcade machines, computers and video game consoles.
The term is commonly used to refer to tracker format music using extremely basic and small samples that an old computer or console could produce (this is the original meaning of the term), as well as music that combines PSG sounds with modern musical styles.
It has been described as "an interpretation of many genres" since any existing song can be arranged in a chiptune style defined more by choice of instrument and timbre than specific style elements.
A waveform generator is a fundamental module in a sound synthesis system. A waveform generator usually produces a basic geometrical waveform with a fixed or variable timbre and variable pitch. Common waveform generator configurations usually included two or three simple waveforms and often a single pseudo-random-noise generator (PRNG). Available waveforms often included pulse wave (whose timbre can be varied by modifying the duty cycle), square wave (a symmetrical pulse wave producing only odd overtones), triangle wave (which has a fixed timbre containing only odd harmonics, but is softer than a square wave), and sawtooth wave (which has a bright raspy timbre and contains odd and even harmonics). Two notable examples of systems employing this technology were the Nintendo Game Boy portable game console and the Commodore 64 personal computer. The Game Boy uses two pulse channels (switchable between 12.5%, 25%, 50% and 75% wave duty cycle), a channel for 4-bit pulse-code modulation (PCM) playback, and a pseudo-random-noise generator. The Commodore 64, however, used the MOS Technology SID chip which offered 3 channels, each switchable between pulse, saw-tooth, triangle, and noise. Unlike the Game Boy, the pulse channels on the Commodore 64 allowed full control over wave duty cycles.
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