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EPGs are typically sent within the broadcast [[transport stream]] or alongside it in a special [[data]] channel. The [[ATSC]] standard for DTV uses tables sent in each station's [[PSIP]], for example. These tables are meant to contain the program start time and title, and additional programme descriptive ´metadata´. In the U.S., these devices receive [[time signal]]s from local [[Public Broadcasting Service|PBS]] [[TV network]] [[affiliate]]s, so that they can record on time. Most systems, however, rely upon third party ¨metadata aggregators¨ (companies such as Tribune TV Data or Gemstar TV Guide in the US and Europe), to provide good quality data content.
An exapmle of an EPG system is [[Guide Plus]]+.
== External links ==
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