Trigger Information Embedding in PCR Packets for Digital TV
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Solution Overview
Problem
In the USA, digital television broadcasting does not allocate a band for data broadcasting, leading to a deterioration in picture and tone qualities of television programs due to the need to narrow the video and audio bands, and existing retransmission systems may exclude data broadcasting packets, preventing effective execution of data broadcasting content with AV content.
Innovation Solution
A broadcasting system and apparatus that transmit and receive trigger information in synchronization with AV content progress, allowing for the control and execution of application programs linked with AV content without allocating a band for data broadcasting, using a PCR packet to embed trigger information within digital television broadcast signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a band for data broadcasting is allocated in digital television broadcasting, then data broadcasting content can be transmitted, but the video band and audio band must be narrowed, leading to deterioration in picture and tone qualities
Solution Approach 1:
The patent extracts the trigger information from the data broadcasting content and transmits it separately through the AV content band. This allows the data broadcasting functionality to be implemented without allocating a separate band, thus avoiding the need to narrow the video and audio bands and maintaining picture and tone qualities.
Solution Approach 2:
The patent makes the AV content band serve multiple functions by embedding trigger information within it. The same broadcasting band is used for both AV content transmission and data broadcasting control signals, eliminating the need for an additional dedicated band and avoiding quality deterioration.
2Adaptability or versatility
If trigger information is transmitted to control application programs, then application programs can be executed in conjunction with AV content, but the system complexity increases due to synchronization requirements
Solution Approach 1:
The patent introduces a timing synchronization mechanism that acts as an intermediary between the transmitted trigger information and the application program execution. This mediator ensures that applications are launched at the correct time relative to the AV content without requiring complex direct synchronization between all system components.
3Productivity
If existing retransmission systems are used, then digital television programs can be retransmitted, but data broadcasting packets are excluded, preventing effective execution of data broadcasting content
Solution Approach 1:
The patent makes the retransmission system dynamic by configuring the packet filter to selectively pass through packets containing trigger information based on their PID values. This dynamic filtering allows the system to maintain high retransmission efficiency while simultaneously supporting data broadcasting functionality through adaptive packet selection.
Data Source
AI summary
Disclosed herein is a reception apparatus for receiving AV content, including: a receiver configured to trigger information for controlling processing associated with an application program to be executed in conjugation with a progress of the AV content; a holder configured to hold the application program; and a controller configured to control a state of a first application program depending on whether first trigger information for specifying processing associated with the first application program held in the holder as a subject of control has been received in synchronization with a predetermined reception timing.