How Interactive Television Systems Send Applications Alongside Video Streams

A system for broadcasting interactive software applications alongside video programs so that a television or set-top box can run them in real-time.

What it covers

The patent describes a way to bundle interactive software with a video broadcast. It uses a data stream where video packets and application packets are mixed together using time-division multiplexing. A client device, like a set-top box, acts as a filter; it identifies which packets belong to the video and which belong to the application code. It then assembles the application and runs it, allowing the software to overlay graphics or sound directly onto the video program, creating an interactive experience for the viewer.

What it doesn't cover

• —Does not cover applications delivered solely over the internet via standard HTTP/IP protocols.
• —Does not cover video-on-demand systems where the application is not bundled in the same multiplexed stream as the video.
• —Does not cover non-interactive video broadcasting where no auxiliary application code is executed.

The clever bit

The system repetitively broadcasts the application code independently of the client's state, meaning a viewer can tune into a channel at any time and the set-top box will eventually catch the full application cycle to start the interactive features.

Why it matters

This technology was foundational for the transition from passive television to interactive digital television. It allowed cable and satellite providers to offer features like on-screen program guides, interactive advertisements, and simple games that felt integrated into the broadcast signal.

Real-world examples

• 1.Early digital cable set-top boxes
• 2.Interactive electronic program guides (EPG)
• 3.Broadcast-based interactive television services