Digital Radio Broadcast Receiver Synchronization and Tagging
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Solution Overview
Problem
In digital radio broadcasting systems, ambiguities arise in tagging content of interest due to misalignment between program service data and audio content, leading to difficulties in identifying and purchasing items of interest.
Innovation Solution
A digital radio broadcast system that synchronizes the start of program service data with audio content to within 0.5 seconds for transmission and ensures alignment at the receiver to within 3 seconds, allowing for precise user identification and tagging of content by truncating and replacing program data to maintain synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If program service data and audio content are transmitted without synchronization, then transmission simplicity is maintained, but content identification accuracy deteriorates due to misalignment
Solution Approach 1:
The system performs preliminary synchronization by aligning program service data with audio content before transmission. The broadcaster's system pre-processes the data to ensure proper temporal alignment, so that when the receiver gets the signal, the content identification is already accurate without requiring complex post-reception synchronization mechanisms.
Solution Approach 2:
A synchronization marker or timing signal acts as an intermediary between the program service data and audio content. This intermediary element carries timing information that enables the receiver to align the data with the corresponding audio segment, resolving the misalignment issue without adding significant complexity to the overall system.
2Measurement precision
If program data is continuously transmitted without truncation, then data completeness is maintained, but synchronization accuracy deteriorates over time
Solution Approach 1:
The system implements periodic truncation of program data at defined intervals or segment boundaries. By regularly resetting and re-synchronizing the data transmission at periodic intervals, the system maintains synchronization accuracy over time while accepting that individual data segments may be truncated. This periodic action prevents cumulative drift between data and audio content.
3Measurement precision
If strict 0.5 second alignment is enforced at transmission, then content identification accuracy is improved, but transmission flexibility deteriorates
Solution Approach 1:
The synchronization requirement is made dynamic rather than static. While 0.5 second alignment is the target at transmission, the system allows for reasonable deviations at the receiver end through buffering and timing adjustment mechanisms. This dynamic approach maintains high identification accuracy while providing flexibility to handle variations in transmission conditions and receiver processing speeds.
Data Source
AI summary
A digital radio broadcast system includes a processing system that receives first audio content, first program data identifying a first item for the first audio content, second audio content, and second program data identifying a second item for the second audio content such that a start of the first program data is received at the processing system within 0.5 seconds of a start of the first audio content. A digital radio broadcast signal including the audio content and the program data is processed for digital radio broadcast transmission via a transmitter. The processing system stops delivery of the first program data to the transmitter upon receipt of the second program data, the first program data thereby being truncated, and begins delivery of the second program data to the transmitter. A digital radio broadcast receiver can tag content of interest based on a user command registered at the receiver.