Difference between revisions of "Aes"

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==Overview==
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#REDIRECT [[AES]]
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The term "<nowiki>AES</nowiki>" is used as an abbreviation for Audio Engineering Society; an international organization that, among other things, sets up standards for connection and interfacing of audio equipment. The AES3 standard is the current worldwide standard for professional digital audio interfacing, and includes a number of formats. The most common is the stereo format that is carried by 110 Ohm shielded twisted-pair cable with XLR connectors in each end (similar to a microphone cable).
 
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==History==
 
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The first AES standard was adopted in 1985 and left many parts open for future development or allowed to be left as "not implemented." The first generation of "AES" digital interfaces suffered compatibility problems including channel reversals and incorrect interpretation of informational "status bits" that carried information about the audio content; such as Sample frequency, number of bits, and Pre-emphasis. As a result; many pro audio interfaces will pass the audio content of the digital audio signal at the proper sample frequency; even if the status bits embedded in the digital audio signal a do not "match" the audio content. In some cases, there is an indication warning of the miss-match, and in other cases a manual setting must be selected to allow the signal to pass. 
 
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To address the need for a consumer format, the developers of the Compact Disc Sony-Phillips developed the Sony-Phillips Digital Interconnect Format (S-PDIF) which was derived directly from the AES professional standard with some important differences. The consumer format was essentially the same in the basic format of the digital code; including the "sync" portion at the beginning of each left-right sample section (or "Frame") and the position of the audio data within the frame. But almost all of the non-audio status-bits were arranged differently. Shortly after 1987 with the development of the Serial Copy Management Scheme in response to the RIAA concerns regarding copyright infringement by digital copies, SCMS data was also included in the consumer format. The format was superseded by the IEC 60958 type II standard; which is essentially the same.
 

Latest revision as of 15:21, 17 July 2012

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