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A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs. The term sound card is also applied to external audio interfaces used for professional audio applications.
Control channels Controlled source Wave / PCM stereo: Audio signal generated by the CPU via the sound card's digital-to-analog converter. (This includes audio produced by games, MP3 or WAV players, but also some software playing a CD-DA through the CPU, such as, Windows Media Player or Media Player Classic, as well as TV tuner cards that use the CPU for decoding audio.)
Rear of a PCI sound card showing 3.5mm analog outputs. The interface between an auditory output device and a computer is the sound card. Sound cards may be included on a computer's motherboard, installed as an expansion card, or as a desktop unit. [6] [7] The sound card may offer either an analog or digital output.
Early systems such as Digidesign's Sound Tools (1989) and Session 8 (1993) [3] and the Ensoniq PARIS (1998) consisted of an external unit that connected to the host computer with a ISA or SCSI card, but from the late 1990s onwards it became practical to use standard computer interfaces such as FireWire, USB, and eventually Thunderbolt instead.
Combined sound and graphics NMOS chip [16] SID (6581 / 8580) 1981 3 Commodore 64 and Commodore 128 computers, Elektron SidStation synthesizer sound module: NMOS chip (6581) / HMOS-II chip (8580) [17] [18] TED (7360 / 8360) 1983 2 Commodore 16, Commodore Plus/4: HMOS chip [19] Microchip Technology: AY8930: 1989 3 Covox Sound Master Card Oki ...
Each layer that is bypassed means a reduction in latency (the delay between an application sending audio information and it being reproduced by the sound card, or input signals from the sound card being available to the application). In this way, ASIO offers a relatively simple way of accessing multiple audio inputs and outputs independently.
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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 ).