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| Toslink | |
|---|---|
| Name | Toslink |
| Invented | 1983 |
| Designer | Toshiba |
| Type | Optical fiber connector |
| Primary use | Digital audio transmission |
Toslink is a standardized optical fiber connection system for digital audio transmission developed in the early 1980s. It converts electrical digital audio signals into pulses of infrared light and back, enabling signal transfer between consumer electronics such as Sony, Pioneer Corporation, Kenwood Corporation, Panasonic Corporation, Denon and Yamaha Corporation devices. The system became widespread in home theater, professional audio playback chains, and portable devices, connecting components like compact disc players, DVD players, Blu-ray Disc players, and video game consoles.
Toslink provides an optical interface carrying serialized digital audio formats between sources and sinks across short distances among manufacturers including Toshiba, Hitachi, Samsung Electronics, LG Electronics, Sharp Corporation and Philips. It typically conveys two-channel PCM audio and, in some implementations, compressed multichannel formats handled by devices from Marantz and Onkyo. The optical medium prevents electrical ground loops affecting systems built with equipment such as NAD Electronics or Cambridge Audio, and it is commonly found alongside connectors like RCA connector, HDMI, XLR connector and TRS connector on receivers made by Harman International Industries and Bose Corporation.
Introduced by a major Japanese electronics company in the 1980s, Toslink emerged as an industry response to interoperability needs among Sony's Compact Disc Digital Audio players, Pioneer's amplifiers, and early digital audio devices developed by Toshiba and Sanyo Electric Co., Ltd.. Standards bodies such as JEITA and manufacturers including Mitsubishi Electric and NEC coordinated to adopt optical digital transmission for consumer markets dominated by Philips and Hitachi. The format spread through the 1990s with the rise of CD-ROM drives, DVD-Audio and SACD collaborations among firms like Sony Computer Entertainment, Microsoft, Nintendo, and Sega Corporation when digital audio interfaces became essential in home entertainment ecosystems managed by companies such as Roku, Inc. and Apple Inc..
Toslink transmits serialized digital audio via modulated infrared light, typically at baseband bitrates compatible with AES3-derived consumer formats and IEC 60958-based signaling, enabling sampling rates of 32, 44.1, and 48 kHz and word lengths commonly at 16 or 24 bits. Implementations interoperate with digital audio processors from Texas Instruments, Cirrus Logic, Analog Devices, and codec vendors used by AKG Acoustics and Sennheiser. The optical fiber types used are plastic optical fiber (POF) or glass fiber, with modal characteristics similar to those standardized by ITU-T recommendations for short-reach links. Physical layer timing and framing resemble protocols parsed by digital receivers from Rockwell Semiconductor and Broadcom Inc. in conjunction with audio clocking hardware seen in systems from Intel Corporation and ARM Holdings.
The common connector form factor is a square optical plug with shutter assembly used by consumer electronics from Sony, Denon, Onkyo, and Pioneer. Cable construction ranges from inexpensive polymer fibers used in accessories by Logitech and Belkin International to higher-spec multimode glass variants sold by companies such as Corning Incorporated and 3M Company. Manufacturers produce adapters between this optical plug and other fiber terminations similar to those standardized by IEC and implemented by firms like Amphenol Corporation and Molex LLC in pro-audio equipment alongside connectors like BNC connector and DIN connector.
Toslink is used to connect digital audio sources—CD players, DVD players, Blu-ray Disc players, set-top boxes, soundbars, and AV receivers—from brands like Sony Computer Entertainment, Microsoft Xbox, Nintendo Switch, Samsung, and LG. It is common in consumer setups that include devices from Yamaha Corporation, Marantz, Harman Kardon, Bose Corporation, and Bang & Olufsen. While it carries two-channel PCM and some compressed streams, it is not natively compatible with high-bandwidth multichannel, lossless formats deployed in Blu-ray authoring chains by studios such as Warner Bros., Paramount Pictures, Universal Pictures, and Sony Pictures Entertainment without intermediary processing by devices from Denon or Onkyo.
Optical transmission via Toslink avoids electromagnetic interference present near equipment from Motorola Solutions or Siemens AG installations, but it faces attenuation and modal dispersion over lengths greater than typical consumer cables supplied by Monoprice or AmazonBasics. The maximum practical length for polymer optical fiber offerings is short compared with glass fiber runs used in telecommunications by Verizon, AT&T, and NTT Communications. Toslink cannot convey modern high-bit-rate, lossless multichannel formats like those used in Dolby TrueHD and DTS-HD Master Audio without prior decoding or downmixing, limiting use in advanced home theater systems produced by Dolby Laboratories and DTS, Inc..
Digital audio interfaces that have supplanted Toslink in many contexts include HDMI, USB Audio Class implementations used by Apple Inc. and Google LLC devices, and professional formats such as AES/EBU and MADI used in studios by companies like Avid Technology and Yamaha Corporation. Networked audio standards and protocols—Dante (audio networking), AVB, Bluetooth codecs (aptX, SBC) driven by firms such as Qualcomm and Bluetooth SIG—and optical fiber solutions in data centers from Cisco Systems represent modern successors for high-bandwidth, multichannel distribution. Renewed interest in fiber optics for immersive audio formats from IMAX and streaming services such as Netflix and Amazon Prime Video further shifts integration toward interfaces providing higher throughput and copy protection handled via HDCP on HDMI.
Category:Digital audio connectors