Audio-Video Broadcasting Equipment with Automatic Latency Feedback
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Solution Overview
Problem
Existing audio-video synchronization methods require complex user intervention and service interruptions, such as manual adjustments or complex clock synchronization, to align audio and video streams.
Innovation Solution
A system where audio-video broadcasting equipment introduces identification data into the audio stream and receives an audio latency value via a communication link to synchronize the video stream automatically without user intervention or service interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of audio delay or advance is implemented, then audio-video synchronization can be achieved, but user operation complexity increases
Solution Approach 1:
The system automatically measures audio latency and adjusts video timing without user intervention. The audio-video broadcasting equipment autonomously performs synchronization by receiving audio latency values from audio reproduction equipment and applying appropriate video delays, eliminating the need for manual cursor adjustments while maintaining precise synchronization.
Solution Approach 2:
The system implements a feedback mechanism where audio reproduction equipment measures its actual audio latency and transmits this information back to the audio-video broadcasting equipment. This feedback loop enables automatic closed-loop synchronization control, where the video timing is continuously adjusted based on real audio latency measurements, achieving precise synchronization without user intervention.
2Manufacturing precision
If reference clock sharing and timestamp information are used, then audio-video synchronization can be achieved, but system complexity and installation requirements increase
Solution Approach 1:
The invention extracts only the essential synchronization information (audio latency value) from the complex reference clock and timestamp system. Instead of implementing full reference clock sharing and timestamp decoding, the system simply measures and transmits the audio latency value, which is then used to adjust video timing. This extraction approach maintains synchronization precision while eliminating complex clock management and timestamp processing requirements.
Solution Approach 2:
The invention introduces a simple intermediary mechanism - a communication link for exchanging audio latency values - that mediates between the audio and video paths. This intermediary approach replaces the need for complex reference clock synchronization and timestamp information exchange, achieving the same synchronization goal through a simpler intermediate data exchange.
3Manufacturing precision
If reference clock synchronization is implemented, then audio-video synchronization can be achieved, but service interruption during installation occurs
Solution Approach 1:
The system maintains continuous audio-video playback and measurement operations throughout the synchronization process. The audio latency measurement and video timing adjustment occur while the system remains in normal operational state, allowing service to continue uninterrupted. The synchronization is achieved through real-time measurements and adjustments rather than requiring installation-time configuration that would halt service.
4Ease of operation
If automatic synchronization is implemented, then user intervention is eliminated, but data exchange complexity increases
Solution Approach 1:
The invention extracts only the essential synchronization parameter (audio latency value) from complex data exchange protocols. Instead of implementing full reference clock synchronization data exchange or detailed timestamp information transfer, the system simply exchanges the measured audio latency value through a communication link. This extraction approach enables automatic synchronization while keeping the data exchange mechanism simple and lightweight.
Data Source
AI summary
Audio-video broadcasting equipment receiving an audio-video stream includes an inbound audio stream and an inbound video stream and connected to audio reproduction equipment via a one-directional audio link and via a communication link. The equipment includes a first processing unit arranged to introduce identification data in the inbound audio stream to produce an outbound audio stream; transmit said audio stream to the audio reproduction equipment via the one-directional audio link, such that said audio reproduction equipment reproduces said outbound audio stream; receive, via the communication link, an audio latency value induced by the audio reproduction equipment; synchronise an outbound video stream, produced from the inbound video stream, with the outbound audio stream by using the latency value, and reproduce the outbound video stream.