Video Frame Buffering for Satellite Signal Loss Mitigation
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Solution Overview
Problem
Satellite-based video systems for motor vehicles face significant frame loss due to signal blockage by obstacles, which existing technologies like SDARS systems mitigate through time diversity but at the cost of reduced bandwidth and increased hardware requirements.
Innovation Solution
A technique that involves receiving two video streams, where one is a time-delayed version of the other, with embedded watermarks or time codes, to align and replace corrupted frames, allowing for economical mitigation of frame loss without requiring multiple transmitters or new frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time diversity is implemented to mitigate signal loss, then reliability is improved, but bandwidth is reduced and hardware complexity increases
Solution Approach 1:
The patent buffers incoming video frames before processing them for display. This preliminary buffering action allows the system to store multiple frames in memory, enabling replacement of corrupted frames with previously buffered frames without requiring real-time retransmission, thus maintaining reliability while preserving bandwidth
Solution Approach 2:
The patent creates a copy of the video stream by buffering frames in memory. This copying mechanism allows the system to have redundant frame data available for replacement without requiring additional physical video streams or transmitters, thereby improving reliability while avoiding the bandwidth costs of true time diversity systems
2Reliability
If time diversity is implemented to mitigate signal loss, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/physical time diversity approach (multiple transmitters, separate satellite signals) with an electronic/software-based solution using frame buffering and corruption detection algorithms. This substitution reduces hardware complexity while maintaining the reliability benefits of having redundant frame data available
3Reliability
If frame loss is addressed through redundant satellite signals, then reliability is improved, but bandwidth cost increases
Solution Approach 1:
The system performs preliminary buffering of video frames before they are needed for display. This advance preparation allows the receiver to have backup frames readily available in memory, eliminating the need for redundant real-time satellite transmissions and the associated bandwidth costs
4Reliability
If frame loss is addressed through redundant satellite signals, then reliability is improved, but hardware cost increases
Solution Approach 1:
The patent substitutes expensive hardware-based redundancy (multiple satellite receivers, additional transmitters) with a software-based frame buffering and corruption detection system. This reduces hardware costs while maintaining video continuity through intelligent frame replacement algorithms
Data Source
AI summary
A technique for addressing frame loss in a video system includes a number of steps. Initially, a first video stream and a second video stream are received. The first and second video streams each include related video information having a plurality of video frames. At least one of the first and second video streams is buffered and lost or corrupted video frames associated with the first video stream are replaced with uncorrupted video frames from the second video stream.