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| S/PDIF | |
|---|---|
| Name | S/PDIF |
| Type | Digital audio interface |
| Introduced | 1980s |
| Developer | Sony, Philips |
| Successor | AES3 |
| Connector | RCA, TOSLINK, BNC |
S/PDIF S/PDIF is a consumer digital audio transmission standard developed by Sony and Philips Electronics. It defines a format and physical interfaces for carrying stereo or compressed multichannel audio between devices such as Sony PlayStation, Apple Inc. products, Philips CD-i players, Denon receivers, and Yamaha Corporation sound systems. The interface is widely used in home theater chains involving Panasonic, JVC, Kenwood Corporation, and Pioneer Corporation components.
S/PDIF was created to provide a convenient link among products from Sony, Philips Electronics, Technics, Marantz, Harman International, and Bang & Olufsen while maintaining interoperability with professional standards like AES3. Implementations appear in devices from Apple Inc., Microsoft Xbox, Sony PlayStation, Nintendo consoles, and digital audio workstations from Avid Technology and Steinberg. The format influenced development of consumer technologies including Compact Disc, MiniDisc, and early DVD-Audio players and sits alongside interfaces such as HDMI, USB Audio, and FireWire in multimedia setups by companies like Logitech and Creative Technology.
The S/PDIF bitstream is adapted from AES3 but simplified for consumer electronics manufactured by Sony and Philips Electronics. It transmits two-channel PCM data and encoded multichannel streams using biphase mark code (BMC) at rates compatible with Compact Disc Digital Audio (44.1 kHz), Digital Audio Tape standards, and higher sample rates used by DVD-Audio and SACD courtesy of processors from Texas Instruments and Analog Devices. Frame structure, preambles, and channel status bits are specified to allow synchronization and metadata exchange among hardware from Toshiba, Hitachi, Sharp Corporation, and NEC Corporation.
Typical S/PDIF physical layers include coaxial with RCA connectors used in devices by Kenwood Corporation and Pioneer Corporation, and optical fiber using the TOSLINK system developed by Toshiba and licensed to manufacturers like SONY Corporation and Panasonic. Some professional or specialized equipment uses BNC connectors as found in gear from Neutrik and Eventide. Consumer electronics houses such as Onkyo, Marantz, and Yamaha Corporation include RCA and TOSLINK ports on receivers and players for easy interconnection with Denon and Cambridge Audio components.
S/PDIF carries uncompressed linear PCM and, for multichannel, compressed formats such as Dolby Digital (AC-3) and DTS wrapped in a transport stream compatible with decoders from Dolby Laboratories and DTS, Inc.. The interface supports 16-bit and 24-bit word lengths and sample rates including 44.1 kHz, 48 kHz, 96 kHz, and 192 kHz as adopted by Alesis, Focusrite, and MOTU in pro-audio converters. Error detection and channel status bits permit metadata similar to implementations by Sony Music Entertainment, Warner Music Group, and Universal Music Group for CD and DVD releases.
Because S/PDIF is a derivative of the professional AES3 standard, many devices from Sony, Philips Electronics, Panasonic, and Denon interoperate, but differences in electrical levels and optical implementations require attention. Consumers connecting Apple Inc. products, Microsoft consoles, or Nintendo systems to receivers from Yamaha Corporation or Onkyo must consider whether the stream contains PCM, Dolby Digital, or DTS to ensure decoders from Dolby Laboratories or DTS, Inc. are present. Bridge devices and converters from Hama, Belkin, and Monoprice can adapt RCA to TOSLINK or BNC for compatibility with equipment by Cambridge Audio and Arcam.
S/PDIF is used in home audio setups combining components from Sony, Panasonic, Pioneer Corporation, and Denon; in desktop audio interfaces by Creative Technology, Asus, and MSI; and in digital audio workstations running software from Steinberg, Ableton, and Avid Technology. Broadcast facilities and post-production suites sometimes employ S/PDIF when integrating consumer monitors from Genelec or KRK Systems with professional consoles by Soundcraft and Allen & Heath. Portable devices such as earlier Apple iPod models and Sony Walkman units used optical outputs to connect with receivers from Onkyo and Yamaha Corporation.
S/PDIF was formalized in the 1980s by Sony and Philips Electronics as consumer-friendly variant of AES3 to serve the expanding market for digital audio in products like Compact Disc, MiniDisc, and home-recording equipment from Tascam and Roland Corporation. Adoption accelerated through the 1990s as manufacturers including Pioneer Corporation, Kenwood Corporation, Marantz, Denon, Yamaha Corporation, and Panasonic integrated RCA and TOSLINK interfaces into CD players, DVD players, and receivers. The standard remained relevant into the 2000s alongside newer digital interfaces from Hitachi, NEC Corporation, and Samsung Electronics, and it influenced consumer expectations around digital interconnectivity embraced by companies such as Apple Inc. and Microsoft.
Category:Digital_audio