ATSC-M/H Transport Datastream Repositioning for Buffer Stability
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Solution Overview
Problem
The repositioning of data for stationary receivers within an ATSC-M/H transport datastream can lead to buffer overflow or emptying, resulting in loss of TV program data due to limited buffer capacity and differing data rates for audio and video data.
Innovation Solution
The method involves determining new positions for ATSC-transport data packets based on the ratio of fill and read data rates to maintain a minimum spacing distance and buffer assignment, using the MPEG-2-buffer model to prevent buffer overflow and ensure data packet stability, with priority given to audio and video data types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data for stationary receivers are repositioned within the ATSC-M/H transport datastream to create space for mobile receiver data, then mobile receiver data transmission is enabled, but buffer overflow or emptying occurs causing loss of TV program data
Solution Approach 1:
The patent calculates and determines the new positions for stationary receiver data packets before repositioning them in the transport datastream. By pre-calculating positions based on buffer characteristics and data rates, the system avoids buffer overflow or emptying during the repositioning operation, thereby preventing TV program data loss while enabling mobile receiver data transmission.
2Productivity
If stationary receiver data packets are placed close together in the transport datastream, then transmission efficiency improves, but buffer overflow occurs due to limited buffer capacity
Solution Approach 1:
The patent changes the positional parameters of stationary receiver data packets in the transport datastream by calculating optimal spacing distances. This ensures that packets are neither too close (causing buffer overflow) nor too far apart (reducing transmission efficiency), thereby maintaining both transmission efficiency and buffer capacity limits.
3Reliability
If stationary receiver data packets are spaced far apart in the transport datastream, then buffer overflow is prevented, but the buffer is emptied causing data loss
Solution Approach 1:
The patent optimizes the spacing parameter between stationary receiver data packets by calculating precise distances based on buffer characteristics and data rates. This ensures packets are spaced far enough to prevent buffer overflow but close enough to maintain sufficient buffer occupancy, thereby preventing both buffer overflow and emptying.
4Device complexity
If data repositioning is performed without considering buffer characteristics, then implementation complexity is reduced, but data loss occurs due to buffer overflow or emptying
Solution Approach 1:
The patent performs preliminary calculations of new positions for stationary receiver data packets before repositioning, taking into account buffer characteristics and data rates. This pre-planning approach ensures data loss is prevented while maintaining a manageable implementation complexity by automating the calculation process.
Data Source
AI summary
Methods and devices are disclosed for generating a reorganized transport datastream from transport data packets of an original transport datastream displaces the first transport data packets contained in an original transport datastream into determined new positions within the reorganized transport datastream. The new positions are determined dependent upon a first data rate at which the first transport data packets of the reorganized transport datastream are stored in second buffers and a second data rate at which the first transport data packets of the reorganized transport datastream are read out from the second buffers.