Television Receiver Single Decoder Resolution Control
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Solution Overview
Problem
High-definition television (HDTV) receivers face challenges in simultaneously processing multiple images for display and recording due to increased processing options, bandwidth constraints, and varying system configurations, leading to visible decoding artifacts and high costs associated with dual decoders.
Innovation Solution
A television receiver system with a single decoder capable of processing multiple data streams, featuring a controller that allows users to select between full and partial resolution decoding based on user input, enabling efficient decoding and recording of HDTV signals without visible artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single decoder is used to decode multiple data streams, then device complexity and cost are reduced, but visible decoding artifacts appear in the decoded images
Solution Approach 1:
The system dynamically switches between full-resolution decoding and partial-resolution decoding modes based on real-time operational context. When recording is requested, the system activates full-resolution decoding for that specific data stream while maintaining partial-resolution decoding for other displayed streams, thereby adapting decoder behavior to minimize artifacts only when necessary
Solution Approach 2:
The decoder's resolution parameter is changed dynamically based on the intended use of each data stream. The system identifies whether a decoded stream is intended for display or recording, and adjusts the decoding resolution parameter accordingly - using full resolution for recording to avoid artifacts, and partial resolution for simultaneous display to reduce processing load
2Manufacturing precision
If full-resolution decoding is used for recording, then image quality is improved, but processing time and bandwidth requirements increase
Solution Approach 1:
The decoding process is segmented by intended output destination. The system separates data streams intended for recording from those intended for display, and applies different decoding resolutions to each segment. This segmentation allows full-resolution decoding to be applied only to the specific portion (recorded streams) where image quality is critical, rather than to all decoded content
3Productivity
If partial-resolution decoding is used, then processing speed is improved, but visible decoding artifacts appear in the decoded images
Solution Approach 1:
The system dynamically adjusts decoder resolution based on operational mode. During simultaneous display operations, partial-resolution decoding is used to maintain processing speed. When recording operations are initiated, the system dynamically switches to full-resolution decoding for the recorded stream, eliminating artifacts only when the quality requirement becomes critical
Data Source
AI summary
A television receiver includes a source of digital data comprising a plurality of data streams each representing one of a standard definition television signal and a high definition television signal and encoded in such a manner that it may be decoded at full resolution to produce an image substantially without visible decoding artifacts or decoded at partial resolution to produce an image possibly including visible decoding artifacts. A decoder is coupled to the digital data source, and has a maximum decoding bandwidth less than that required to simultaneously decode two high definition television signals at full decoding resolution. A controller, is coupled to the decoder, for selecting two respective ones of the data streams responsive to user input, and if both represent a high definition television signal, requesting user input for specifying one of the two respective data streams to decode at partial resolution.