A sound chip is an integrated circuit (chip) designed to produce audio signals through digital, analog or mixed-mode electronics. Sound chips are typically fabricated on metal–oxide–semiconductor (MOS) mixed-signal chips that process audio signals (analog and digital signals, for both analog and digital data). They normally contain audio components such as oscillators, envelope controllers, samplers, filters, amplifiers, and envelope generators.
A number of sound synthesis methods for electronically producing sound were devised during the late 20th century. These include programmable sound generators (PSG), wavetable synthesis, and frequency modulation synthesis (FM synthesis). Such sound chips were widely used in arcade game system boards, video game consoles, home computers and digital synthesizers.
Since the late 1990s, pulse-code modulation (PCM) sampling has been the standard. For example, as used in the Intel High Definition Audio (IHDA) standard of 2004. The PCM method is used in mobile phones, and in sound cards for personal computers. Its widespread use is part of the digital sound revolution.
There are multiple types of sound chips, divided based on their use.
Main article: List of sound chips
Sound chips come in different forms and use a variety of techniques to generate audio signals.
Sound chips are commonly used in various digital electronic devices, particularly personal computers (including sound cards and motherboards), video game systems (including arcade system boards and video game consoles), electronic musical instruments (including synthesizers, digital synthesizers and electronic keyboards), and digital telecommunications (including digital telephony, digital television, mobile phones and smartphones).