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TOSLINK (Toshiba Link) [3] is a standardized [4] optical fiber connector system. [5] Generically known as optical audio, the most common use of the TOSLINK optical fiber connector is in consumer audio equipment in which the digital optical socket carries (transmits) a stream of digital audio signals from audio equipment (CD player, DVD player, Digital Audio Tape recorder, computer, video game ...
S/PDIF (Sony/Philips Digital Interface) [1] [2] 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 or BNC connectors, or a fibre-optic cable using TOSLINK connectors.
S/PDIF is an audio-only format carried over electrical coaxial cable (with RCA jacks) or optical fibre . Note that there are no differences in the signals transmitted over optical or coaxial S/PDIF connectors—both carry exactly the same information. Selection of one over the other rests mainly on the availability of appropriate connectors on ...
In the latter case, output is often transmitted using SPDIF as either an electrical signal or an optical interface known as TOSLINK. Digital outputs are then decoded by an AV receiver. In the case of wireless audio, the computer merely transmits a radio signal, and responsibility of decoding and output is shifted to the speaker.
The precursor of the IEC 60958 Type II specification was the Sony/Philips Digital Interface, or S/PDIF. Both were based on the original AES/EBU work. S/PDIF and AES3 are interchangeable at the protocol level, but at the physical level, they specify different electrical signalling levels and impedances, which may be significant in some applications.
In order to fit 8 channels within the bandwidth limits of the standard TOSLINK transceiver modules, the bitstream is not biphase mark coded like S/PDIF. Instead, NRZI coding is used, where a 0 bit indicates no transition and a 1 bit is a transition. 8 audio samples at 24 bits per sample plus 4 user bits (196 bits total) are sent in groups of 4 ...
In audio equipment, I²S is sometimes used as an external link between a CD player or digital audio streaming device and an external digital-to-analog converter, as opposed to a purely internal connection within one player box. This may form an alternative to the commonly used AES/EBU, Toslink or S/PDIF standards.
Cables should meet the S/PDIF specification as defined by the international standard IEC 60958-3 for assured performance. The male plug has a center pin that is 1 ⁄ 8 inch (3.175 mm) in diameter, and is surrounded by an outer shell that is 1 ⁄ 3 inch (8.47 mm) in diameter.