Content deleted Content added
Punctuation. Tags: Mobile edit Mobile web edit |
VulcanSphere (talk | contribs) →Current applications: Adding wikilink to Gracenote |
||
Line 56:
Standards for delivery of scheduling information to television-based IPGs vary from application to application, and by country. Older television IPGs like [[Guide Plus]]+ relied on analog technology (such as the [[vertical blanking interval]] of analog television video signals) to distribute listings data to IPG-enabled consumer receiving equipment. In Europe, the [[European Telecommunications Standards Institute]] (ETSI) published standard ETS 300 707 to standardize the delivery of IPG data over [[Digital Video Broadcasting|digital television broadcast signals]]. Listings data for IPGs integrated into digital terrestrial television and radio receivers of the present day is typically sent within each station's [[MPEG transport stream]], or alongside it in a special [[data]] stream. The [[ATSC standard]] for digital terrestrial television, for instance, uses tables sent in each station's [[Program and System Information Protocol|PSIP]]. These tables are meant to contain program start times and titles along with additional program descriptive metadata. [[Time signal|Current time signals]] are also included for [[on-screen display]] purposes, and they are also used to set timers on recording devices.
Devices embedded within modern digital cable and satellite television receivers, on the other hand, customarily rely upon third-party listings metadata aggregators to provide them with their on-screen listings data. Such companies include [[Tribune Media Services|Tribune TV Data]] (now [[Gracenote]], part of [[Nielsen Holdings]]), Gemstar-TV Guide (now [[TiVo Corporation]]), FYI Television, Inc. in the United States and Europe; TV Media in the United States and Canada; Broadcasting Dataservices in Europe and Dayscript in [[Latin America]]; and What's On India Media Pvt. Ltd in [[India]], [[Sri Lanka]], [[Indonesia]], the [[Middle East]] and [[Asia]].
Some IPG systems built into older set-top boxes designed to receive terrestrial digital signals and television sets with built-in digital tuners may have a lesser degree of interactive features compared to those included in cable, satellite and IPTV converters; technical limitations in these models may prevent users from accessing program listings beyond (at maximum) 16 hours in advance and complete program synopses, and the inability for the IPG to parse synopses for certain programs from the MPEG stream or displaying next-day listings until at or after 12:00 a.m. local time. IPGs built into newer television (including [[Smart TV]]), digital terrestrial set-top box and antenna-ready DVR models feature on-screen displays and interactive guide features more comparable to their pay television set-top counterparts, including the ability to display grids and, in the case of DVRs intended for terrestrial use, the ability – with an Internet connection – to access listings and content from [[over-the-top content|over-the-top]] services.
| |||