Receiving Apparatus Playback Selection for Low Capability Devices
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Solution Overview
Problem
High-speed playback of MPEG-encoded image data on magnetic tapes is hindered by the inability to accurately scan tracks due to varying frame sizes and the need for reference frames, leading to incomplete data retrieval and low-quality playback, especially when the processing and display capabilities of external apparatuses are insufficient to handle high transfer rates.
Innovation Solution
A receiving apparatus connected to an image output device, capable of receiving and storing moving image data and digest data, which selects between the two based on processing and display capabilities to ensure smooth playback, using a selector and display controller to output either the moving image data or digest data, allowing for high-quality playback even with low-capability receiving devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MPEG-encoded image data is recorded on magnetic tape with varying frame sizes, then encoding efficiency is improved, but high-speed playback quality deteriorates due to inability to accurately scan tracks
Solution Approach 1:
The patent applies preliminary action by pre-calculating and recording playback position information during the encoding phase. The system computes where each frame should be positioned during high-speed playback and stores this position data with the encoded image data, enabling accurate track scanning without requiring variable frame sizes to be physically adjusted during playback.
Solution Approach 2:
The patent introduces playback position information as an intermediary element between the encoded image data and the playback process. This intermediary data structure allows the system to maintain variable frame sizes for encoding efficiency while providing fixed positional references for accurate high-speed playback scanning.
2Speed
If external apparatus processes moving image data at high transfer rates, then data transmission speed is improved, but processing and display quality deteriorate due to insufficient processing capability
Solution Approach 1:
The patent applies partial action by selectively transmitting only essential playback position information rather than complete image data at high speeds. The system sends compressed position data that can be processed at high transfer rates, while the actual image rendering is performed locally at the playback device, avoiding the bottleneck of processing complete high-resolution data externally.
Solution Approach 2:
The patent replaces the mechanical processing approach (where external apparatus decodes and processes complete image data) with a data-structure-based approach. By substituting full image data transmission with playback position information transmission, the system achieves high transfer rates without overwhelming the processing capabilities of the receiving apparatus.
Data Source
AI summary
An apparatus and method allow playback of transferred moving image data by a receiving apparatus for confirmation of the received contents even when the transfer rate of moving image data for normal playback is high and when the processing capability and displaying capability of the apparatus on the receiving side are low. To this end, when the transfer rate of moving image data for normal playback is high and when the processing capability and displaying capability of a personal computer are low, received image data for high speed playback is displayed in place of decoding and displaying received moving image data for normal playback.