Overview
IEC 62298-4:2005 - TeleWeb application, Part 4: Hyperteletext profile - specifies the TeleWeb Hyperteletext profile that enables Web-style text and graphics to be delivered and displayed on TV decoders. The standard defines the multimedia data file formats, presentation-layer behavior (TeleWeb HTML and scripting), graphical requirements (fonts, frames, forms) and content attributes for TeleWeb services. It is backwards compatible with IEC 62298-3 (Superteletext profile) and extends that profile with features such as scripting, style sheets, frames and forms to support richer interactive TV content.
Key topics and technical requirements
- Presentation layer & TeleWeb HTML: Defines how Web-style markup and hypertext are implemented on TV decoders, including TeleWeb HTML and scripting support.
- Scripting and DOM: Support for ECMAScript and a DOM (document object model) subset is specified to enable interactive behaviors.
- Style sheets: Adds support for CSS-like styling to control on-screen presentation.
- Graphics and fonts:
- Mandatory support for bold, italics, and bold italics for Latin fonts (resident or downloadable).
- Support for downloadable fonts and non-Latin alphabets is addressed.
- Dithering requirement when decoders cannot reproduce colors from the TeleWeb palette.
- Hypertext features: Frames, forms, links, internationalization, and tags and other HTML extensions are documented.
- Mandatory Superteletext features: Certain optional features from IEC 62298-3 are made mandatory for Hyperteletext receivers (e.g., EPG).
- Cross-linking & context-switching: Navigation between TeleWeb services and teletext, including absolute TeleWeb URLs and device behavior on re-tuning.
- Optional components: Device ID, audio clips, additional content types and ISP interface topics (network congestion control, return-channel behavior).
- Normative interoperability references: DVB SI (ETSI EN 300 468), W3C HTML/CSS, ISO time/date (ISO 8601), MPEG/ISO audio, MIME types, SMPTE DOM references and font specs.
Applications - who uses this standard
- Broadcasters and content producers delivering interactive TV and enhanced program information.
- Decoder, set‑top box and smart TV manufacturers implementing TeleWeb Hyperteletext rendering, scripting and font subsystems.
- Middleware and software developers building TeleWeb services, EPGs and interactive applications for living-room TV.
- Systems integrators ensuring interoperability with DVB networks, return channels and conditional access systems.
Related standards
This profile is designed to deliver Web-style, TV-optimized content reliably and efficiently - enabling richer, standards-based interactive television experiences using TeleWeb Hyperteletext.