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"Integrated Services Digital Network", commonly known as ISDN, is a technology that provides full end-to-end switched digital service for voice and data communications. One application of ISDN is the transmission of audio. ISDN provides a duplex digital link, to facilitate live recording of voiceovers from remote locations. A producer in a studio in Los Angeles, for example, can record a voice actor in Amsterdam, or Chicago, or San Diego, or anywhere else in the world there are ISDN lines available. ISDN is now common in most developed countries. Unlike an ISDN connection to the internet via a standard computer, which allows the transfer of audio files such as MP3 using packet-switched asynchronous transmission protocol, a dedicated Codec device like the Musicam CDQ Prima™ or Telos Zephyr uses ISDN lines to connect to other Codecs for real time high-fidelity voice transmission. |
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