An audio interface is a piece of computer hardware that allows the input and output of audio signals to and from a host computer or recording device. Audio interfaces are closely related to computer

sound card 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 ...

s, but whereas sound cards are optimized for audio playback an audio interface is primarily intended to provide low-latency analog-to-digital and digital format conversion for

professional audio Professional audio, abbreviated as pro audio, refers to both an activity and a category of high-quality, studio-grade audio equipment. Typically it encompasses sound recording, sound reinforcement system setup and audio mixing, and studio mus ...

applications. Audio interfaces may include microphone preamps, as well as analog line inputs, DI inputs, and

ADAT Alesis Digital Audio Tape, commonly referred to as ADAT, is a magnetic tape format used for the Sound recording and reproduction, recording of eight digital audio tracks onto the same S-VHS tape used by consumer VCRs, and the basis of a serie ...

S/PDIF S/PDIF (Sony/Philips Digital Interface) is a type of digital audio interface used in consumer audio equipment to output audio over relatively short distances. The signal is transmitted over either a coaxial cable using RCA connector, RCA or BN ...

digital inputs. Outputs are analog line, headphones and digital. They're typically available as external units, either as desktop devices or in a 19-inch rackmount format. Audio interfaces range from two channels in and out, to over 30. MOTU Audio Interfaces 7851

History

Standalone audio interfaces grew from the proprietary hard disk recording market of the 1980s and 1990s, but advances in processor power and hard drive speed meant that, by the mid-1990s, standard home computers were capable of recording multi-channel audio at 16-bit, 44khz

compact disc The compact disc (CD) is a Digital media, digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings. It employs the Compact Disc Digital Audio (CD-DA) standard and was capable of hol ...

standard. Early systems such as

Digidesign Avid Audio (formerly Digidesign) is an American digital audio technology company. It was founded in 1984 by Peter Gotcher and Evan Brooks. The company began as a project to raise money for the founders' band, selling EPROM chips for drum machin ...

's Sound Tools (1989) and Session 8 (1993) and the Ensoniq PARIS (1998) consisted of an external unit that connected to the host computer with a ISA or

SCSI Small Computer System Interface (SCSI, ) is a set of standards for physically connecting and transferring data between computers and peripheral devices, best known for its use with storage devices such as hard disk drives. SCSI was introduced ...

card, but from the late 1990s onwards it became practical to use standard computer interfaces such as

FireWire IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony a ...

USB Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...

, and eventually Thunderbolt instead.

Versus mixers

Although there is a degree of functional overlap, audio interfaces are differentiated from audio mixers in that they are intended to pass multi-channel audio directly to a host

digital audio workstation A digital audio workstation (DAW ) is an electronic device or application software used for Sound recording and reproduction, recording, editing and producing audio files. DAWs come in a wide variety of configurations from a single software pr ...

, whereas mixers generally sum their inputs into a simple two-channel stereo pair. Audio interfaces are therefore often simple rackmount boxes, without faders, although as of 2020 some digital mixers provide multi-channel audio passthrough.Sweetwater.com, June 2020: Audio Interface vs. Mixer: Which Is Right for My Studio?
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Manufacturers

* Apogee Electronics *

Arturia Arturia is a French electronics company founded in 1999 and based in Grenoble, France. The company designs and manufactures audio interfaces and electronic musical instruments, including software synthesizers, drum machines, analog synthesizers, ...

* Audient * Avid, optimised for

Pro Tools Pro Tools is a digital audio workstation (DAW) developed and released by Avid Technology (formerly Digidesign) for Microsoft Windows and macOS. It is used for music creation and production, sound for picture (sound design, audio post-productio ...

* Behringer * Creative *

Focusrite Focusrite PLC is an English music and audio products group based in High Wycombe, England (with its history in Focusrite Audio Engineering Ltd.). The Focusrite Group trades under eight brands: Focusrite, Focusrite Pro, Martin Audio, ADAM Audio ...

* M-Audio * MOTU *

Native Instruments Native Instruments is a German company that develops, manufactures, and supplies music software and hardware for music production, sound design, performance, and DJing. The company's corporate headquarters and main development facilities are lo ...

PreSonus PreSonus Audio Electronics, Inc. (often known and styled as PreSonus) is an American manufacturer of professional audio equipment and software, used to create, record, mix, and master music and other audio. This includes their line of digital a ...

Roland Roland (; ; or ''Rotholandus''; or ''Rolando''; died 15 August 778) was a Frankish military leader under Charlemagne who became one of the principal figures in the literary cycle known as the Matter of France. The historical Roland was mil ...

Solid State Logic Solid State Logic Ltd. (SSL) is a British company based in Begbroke, Oxfordshire, England that designs and markets audio mixing consoles, Audio signal processing, signal processors, and other audio technologies for the post-production, video p ...

* Steinberg *

TASCAM TASCAM is the professional audio division of TEAC Corporation, headquartered in Tokyo Japan. TASCAM established the Home Recording phenomenon by creating the "Project Studio" and is credited as the inventor of the Portastudio, the first casset ...

* Universal Audio

References

External links

*{{Commonscatinline, Audio I/F Sound production technology Audio engineering