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(Sony/Philips Digital InterFace) A serial interface for transferring digital audio from CD and DVD players to amplifiers and TVs. S/PDIF is typically used to transmit PCM and Dolby Digital 5.1, but it is not tied to any sampling rate or audio standard.

S/PDIF uses unbalanced 75 ohm coaxial cable up to 10 meters with RCA connectors or optical fiber terminated with a TOSLINK (Toshiba link) connector. See AES/EBU and TOSLINK.

AES/EBU is the professional version of S/PDIF and uses a higher signal voltage. They both support the same audio data with slight differences in the frame bits. Conversion between these interfaces must be handled with electronic circuits, not by adapting one connector to another.

S/PDIF shares the same 75 ohm coaxial cable as its AES3id professional counterpart, but also has an optical alternative.

Electrical and Optical Sockets
On the back of this DVD deck are S/PDIF electrical and optical sockets. The RCA jack for the coaxial cable (left) is generally colored orange, but not in this particular unit. If the optical is not used, the stopper plug (at bottom) is inserted to block the laser.
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References in periodicals archive ?
Why can we not declare victory with HDMI and SPDIF and blow away the whole analog pass-through, giving us a direct shot between the DAC and the analog volume control.
The STAC9480/9481 audio codecs offer high-performance, with DAC SNR up to 110dB and features SPDIF transceiver functions, digital interface connectivity and flexible data switching for optimal audio fidelity.
The range of inputs is impressive with XLR, SPDIF, minijack and RCA connectors with balanced and unbalanced options.
I promised a review of the Sangean HD tuner that I previewed in the last issue but a newer model HDT-1X which I do not have in hand yet has features including the ability to lock the unit in analog reception mode when the HD signal is weak and the availability of an SPDIF output allowing for direct digital connection to an AV receiver.
You have 2 USB ports, 3 HDMI ports, a LAN port, Antenna port, SPDIF out, AV in and headphones out.
Of course if you are driving an SPDIF signal into an expensive AV receiver with top-of-the-line DACs and sample rate conversion, then the signal going into the power amp will have less noise and distortion than the one coming off the analog outputs of the low-priced CD player that would typically be connected to the TX 8511.
It offers an aux-in connector, along with a SPDIF input port.