S/PDIF is an inexpensive interface for connecting all amateur format products such as CD players, PC sound cards, DVD players or other devices with this interface. S/PDIF is very similar to the AES3 interface and uses the same frame structure and coding format. S/PDIF transmits data via unbalanced cable or optical cable. Channel status information is a specification for amateur format. Only sampling frequencies up to 48kHz are specified.
The document describes the S/PDIF interface originally developed by Sony and Philips and later standardized as IEC‑60958 Type I. It is similar to AES3, using the same frame structure and coding, and is intended for consumer‑grade audio equipment such as CD players, PC sound cards, and DVD players.
Details include electrical (unbalanced coaxial with RCA/cinch connectors) and optical (TOSLINK) connection methods, electrical characteristics, cable length recommendations, and the operation of the Serial Copy Management System (SCMS) that controls digital copying rights. NTi’s audio analysis tools can display SCMS status bits for further inspection. This manual is written in Chinese.
| Number of channels | 2 |
|---|---|
| Data resolution / sampling rate | 24 Bit / 48 kHz |
| Impedance | 75 Ω |
| Signal level (75 Ω) | 200‑500 mVpp |
| Unbalanced connector type | Cinch (RCA) |
| Optical connector type | TOSLINK |
| Maximum optical cable length | 3 m to 10 m |
S/PDIF supports sampling frequencies up to 48 kHz.
SCMS uses channel‑status bits; the L‑bit marks an original file, and when the data is copied the L‑bit is set to 0, which blocks further copying.
Unbalanced S/PDIF connections use a cinch (RCA) connector.