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EtherSound
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EtherSound is one of several audio over Ethernet
Audio over Ethernet
In audio engineering and broadcast engineering, Audio over Ethernet is the use of an Ethernet-based network to distribute real-time digital audio....

 technologies currently used in audio engineering
Audio engineering
An audio engineer, also called audio technician, audio technologist or sound technician, is a specialist in a skilled trade that deals with the use of machinery and equipment for the recording, mixing and reproduction of sounds. The field draws on many artistic and vocational areas, including...

 and broadcast engineering
Broadcast engineering
Broadcast engineering is the field of electrical engineering, and now to some extent computer engineering and information technology, which deals with radio and television broadcasting...

 applications. EtherSound is developed and licensed by Digigram.

EtherSound is intended by the developer to be compliant with IEEE 802.3
IEEE 802.3
IEEE 802.3 is a working group and a collection of IEEE standards produced by the working group defining the physical layer and data link layer's media access control of wired Ethernet. This is generally a local area network technology with some wide area network applications...

 Ethernet standards. Just as the IEEE defines rates such as 100 Megabit
Fast Ethernet
In computer networking, Fast Ethernet is a collective term for a number of Ethernet standards that carry traffic at the nominal rate of 100 Mbit/s, against the original Ethernet speed of 10 Mbit/s. Of the fast Ethernet standards 100BASE-TX is by far the most common and is supported by the...

 and Gigabit Ethernet
Gigabit Ethernet
Gigabit Ethernet is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second , as defined by the IEEE 802.3-2008 standard. It came into use beginning in 1999, gradually supplanting Fast Ethernet in wired local networks where it performed...

 standards, EtherSound has been developed as both ES-100 (for use on dedicated 100 Megabit Ethernet networks or within a Gigabit network as a VLAN) and ES-Giga (for use on dedicated Gigabit Ethernet networks). The two versions of EtherSound are not compatible.

While Ethersound is compliant with the physical 802.3 standards, logically its token-like scheme of transporting audio data prevents all of its features from being used in a standard any point to any point network topology. It cannot support two way communications in a standard hierarchical Ethernet topology, being able to only distribute audio and control data one way. It is not designed to share Ethernet LAN
Län
Län and lääni refer to the administrative divisions used in Sweden and previously in Finland. The provinces of Finland were abolished on January 1, 2010....

s with typical office operations data or Internet traffic such as email. It supports two way communications only when wired in a daisy chain topology. For this reason Ethersound is best used in applications suitable to a daisy chain network topology or in live sound applications that benefit from its low point-to-point latency.

Low latency is important for many users of Audio over Ethernet
Audio over Ethernet
In audio engineering and broadcast engineering, Audio over Ethernet is the use of an Ethernet-based network to distribute real-time digital audio....

 technologies.One of the most critical applications involves picking up sound from a vocalist's or instrumentalist's microphone on a live performance stage, mixing that signal with those received from other microphones (and performers) and delivering the mix to the performer via in-ear monitors. Latency in this application is particularly annoying to vocalists. This is because a singer hears his or her own voice through bone conduction
Bone conduction
Bone conduction is the conduction of sound to the inner ear through the bones of the skull.Bone conduction is the reason why a person's voice sounds different to him/her when it is recorded and played back. Because the skull conducts lower frequencies better than air, people perceive their own...

 as well as through the outer ear. If the sound from the in-ear monitor lags the bone-conduction sound by more than a few milliseconds, phase shifts and comb filter
Comb filter
In signal processing, a comb filter adds a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly spaced spikes, giving the appearance of a comb....

ing will become audible. EtherSound can deliver up to 64 channels of 48 kHz, 24-bit PCM audio data with a network latency of 125 microseconds. Each device in a daisy-chain network adds 1.5 microseconds of latency. EtherSound's network latency is stable and deterministic: the delay between any two devices on an EtherSound network can be calculated.

External links


Companies that use EtherSound

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
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