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S/PDIF
S/PDIF
(Sony/ Philips
Philips
Digital Interface)[1][2] is a type of digital audio interconnect used in consumer audio equipment to output audio over reasonably short distances. The signal is transmitted over either a coaxial cable with RCA connectors or a fibre optic cable with TOSLINK
TOSLINK
connectors. S/PDIF
S/PDIF
interconnects components in home theatres and other digital high-fidelity systems. S/PDIF
S/PDIF
is based on the AES3
AES3
interconnect standard.[3] S/PDIF
S/PDIF
can carry two channels of uncompressed PCM audio
PCM audio
or compressed 5.1/7.1 surround sound (such as DTS audio codec); it cannot support lossless formats (other than 2ch LPCM) such as Dolby TrueHD
Dolby TrueHD
and DTS-HD Master Audio, that require greater bandwidth[4] like that available with HDMI
HDMI
or DisplayPort. S/PDIF
S/PDIF
is a data link layer protocol as well as a set of physical layer specifications for carrying digital audio signals between devices and components over either optical or electrical cable. The name stands for Sony/ Philips
Philips
Digital Interconnect Format but is also known as Sony/ Philips
Philips
Digital Interface. Sony
Sony
and Philips
Philips
were the primary designers of S/PDIF. S/PDIF
S/PDIF
is standardized in IEC 60958 as IEC 60958 type II (IEC 958 before 1998).[5]

Contents

1 Applications 2 Hardware specifications 3 Protocol specifications 4 Limitations 5 See also 6 Notes 7 References 8 External links

Applications[edit] A common use for the S/PDIF
S/PDIF
interface is to carry compressed digital audio for surround sound as defined by the standard IEC 61937. This mode is used to connect the output of a DVD
DVD
player or computer, via optical or coax, to a home theatre amplifying receiver that supports Dolby Digital
Dolby Digital
or DTS. Another common use is to carry two channels of uncompressed digital audio from a CD player to an amplifying receiver. Hardware specifications[edit]

RCA connector.

S/PDIF
S/PDIF
was developed at the same time as the main standard, AES3, used to interconnect professional audio equipment in the professional audio field. This resulted from the desire of the various standards committees to have at least sufficient similarities between the two interfaces to allow the use of the same, or very similar, designs for interfacing ICs.[6] S/PDIF
S/PDIF
remained nearly identical at the protocol level,[a] but changed the physical connectors from XLR to either electrical coaxial cable (with RCA connectors) or optical fibre (TOSLINK; i.e., F05 or EIAJ optical), both of which cost less than the XLR connection. The RCA connectors are typically colour-coded orange to differentiate from other RCA connector
RCA connector
uses such as composite video. The cable was also changed from 110 Ω balanced twisted pair to 75 Ω coaxial cable, using RCA jacks. Signals transmitted over consumer-grade TOSLINK
TOSLINK
connections are identical in content to those transmitted over coaxial connectors, though TOSLINK
TOSLINK
S/PDIF
S/PDIF
commonly exhibits higher jitter.[7]

Main differences between AES3
AES3
and S/PDIF[8]

AES3
AES3
balanced AES3
AES3
unbalanced S/PDIF

Cabling 110 Ω STP 75 Ω coaxial 75 Ω coaxial or optical fibre

Connector 3-pin XLR BNC RCA or TOSLINK

Output level 2–7 V peak to peak 1.0–1.2 V peak to peak 0.5–0.6 V peak to peak

Min. input level 0.2 V 0.32 V 0.2 V

Max. distance 100 m 1,000 m 10 m

Modulation Biphase mark code Biphase mark code Biphase mark code

Subcode information ASCII
ASCII
id. text ASCII
ASCII
id. text SCMS copy protection info.

Max. resolution 24 bits 24 bits 20 bits (24 bits optional)

Protocol specifications[edit] S/PDIF
S/PDIF
is used to transmit digital signals of a number of formats, the most common being the 48 kHz sample rate format (used in DAT) and the 44.1 kHz format, used in CD audio. In order to support both systems, as well as others that might be needed, the format has no defined data rate. Instead, the data is sent using biphase mark code, which has either one or two transitions for every bit, allowing the original word clock to be extracted from the signal itself. S/PDIF
S/PDIF
is meant to be used for transmitting 20-bit audio data streams plus other related information. To transmit sources with less than 20 bits of sample accuracy, the superfluous bits will be set to zero. S/PDIF
S/PDIF
can also transport 24-bit samples by way of four extra bits; however, not all equipment supports this, and these extra bits may be ignored. With one exception, S/PDIF
S/PDIF
protocol is identical to AES3. The channel status bit differs in S/PDIF. There is one channel status bit in each subframe, making 384 bits in each audio block. The meaning of the channel status bits is completely different between AES3
AES3
and S/PDIF. For S/PDIF, the 192-bit block for each channel is divided into 12 words of 16 bits each. The first 6 bits of the first word are a control code. The meaning of its bits are shown in the accompanying table.

Control word components

Bit Unset (0) Set (1)

0 Consumer (S/PDIF) Professional (AES3) (changes meaning of control word)

1 Normal Compressed data

2 Copy restrict Copy permit

3 2 channels 4 channels

4 — —

5 No pre-emphasis Pre-emphasis

6–7 Mode, defines subsequent bytes, always zero

8–14 Audio source category (general, CD-DA, DVD, etc.)

15 L-bit, original or copy (see text)

Bits 8–14 of the control code are a 7-bit category code indicating the type of source equipment, and bit 15 is the "L-bit", which (for most category codes) indicates whether copy-restricted audio is original (may be copied once) or a copy (does not allow recording again). The L-bit is only used if bit 2 is zero, meaning copy-restricted audio. The L-bit polarity depends on the category, with recording allowed if it is 1 for DVD-R and DVR-RW, but 0 for CD-R, CD-RW, and DVD. For plain CD-DA (ordinary nonrecordable CDs), the L-bit is not defined, and recording is prevented by alternating bit 2 at a rate of 4–10 Hz. Limitations[edit] The receiver does not control the data rate, so it must avoid bit slip by synchronizing its reception with the source clock. Many S/PDIF implementations cannot fully decouple the final signal from influence of the source or the interconnect. Specifically the process of clock recovery used to synchronize reception may produce jitter.[9][10][11] If the DAC does not have a stable clock reference then noise will be introduced into the resulting analog signal. However, receivers can implement various strategies that limit this influence.[11][12] TOSLINK
TOSLINK
optical fiber, unlike coaxial cables, are immune to ground loops and RF interference.[13] The fiber core of TOSLINK, however, may suffer permanent damage if tightly bent. See also[edit]

ADAT Lightpipe Dolby Digital
Dolby Digital
Plus I²S McASP Manchester code

Notes[edit]

^ Consumer S/PDIF
S/PDIF
provides for copy protection, whereas professional interfaces do not

References[edit]

^ " S/PDIF
S/PDIF
Information". Intel. 21 July 2017. Retrieved 3 April 2018.  ^ "S/PDIF". Retrieved 3 April 2018.  ^ "SoundSystem SixPack 5.1+ True 6 Channel + Digital In & out – Stuff Worth Knowing" (PDF). TerraTec. 5 July 2001. p. 43. Retrieved 18 January 2011.  ^ Mark Johnson; Charles Crawford; Chris Armbrust (2007). High-Definition DVD
DVD
Handbook : Producing for HD- DVD
DVD
and Blu-Ray Disc: Producing for HD- DVD
DVD
and Blu-Ray Disc. McGraw Hill Professional. p. 4-10. ISBN 9780071485852. ...connections such as S/PDIF do not have the bandwidth necessary to deliver uncompressed surround sound...  ^ "Sound card". kioskea.net. Kioskea Network. Retrieved 2010-08-04. The components of a sound card are: [...] An SPDIF digital output ( Sony
Sony
Philips
Philips
Digital Interface, also known as S/PDIF
S/PDIF
or S-PDIF or IEC 958 or IEC 60958 since 1998). This is an output line that sends digitised audio data to a digital amplifier using a coaxial cable with RCA connectors at the ends.  ^ Finger, Robert A. 1992 'AES3-1992: The RevisedTwo-ChannelDigital Audio Interface', J.AudioEng.Soc.,Vol.40,No.3, 1992 March, p108 ^ "Toslink or Coax". Retrieved 2015-04-15.  ^ "RaneNote INTERFACING AES3
AES3
& S/PDIF" (PDF). Rane Corp. 2010. p. 2. Retrieved 18 January 2011.  ^ Giorgio Pozzoli. "DIGITabilis: crash course on digital audio interfaces" tnt-audio.com. ^ Chris Dunn, Malcolm J. Hawksford. "Is the AES/EBU/SPDIF Digital Audio Interface Flawed?" AES Convention 93, paper 3360. ^ a b Norman Tracy. "On Jitter, the S/PDIF
S/PDIF
Standard, and Audio DACs." ^ Lesso, Paul (2006). "A High Performance S/PDIF
S/PDIF
Receiver" (PDF). Audio Engineering Society. Archived from the original (PDF) on 4 June 2014.  AES Convention 121, paper 6948 ^ Joseph D. Cornwall (December 31, 2004). "Understanding Digital Interconnects". Audioholics.com. Retrieved 2007-07-12. 

External links[edit]

Wikimedia Commons has media related to S/PDIF.

S/PDIF
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at Epanorama.net More about channel data bits Interfacing AES3
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and S/PDIF

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