Digital Broadcast Receiver Channel Update Logic
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Solution Overview
Problem
In-vehicle digital broadcast receiving systems face issues with updating channels when moving into new broadcast areas, leading to unnecessary presetting of channels that cannot be immediately received due to poor accuracy in area preset information and channel selection.
Innovation Solution
The system scans receivable channels when the reception strength of the current channel decreases, excluding channels with the same area code, and updates the preset memory with channels from the likely destination broadcast area, ensuring only relevant channels are preset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a channel scan of all frequencies is performed when reception strength decreases, then channels registered in preset memory are automatically updated, but unnecessary channels from the original broadcast area may be preset that cannot be received immediately
Solution Approach 1:
The patent segments the channel scanning process by dividing channels into two groups: those belonging to the original broadcast area (to be excluded) and those from new broadcast areas (to be preset). This segmentation is achieved by comparing area codes of detected channels with the area code of the currently received channel, allowing selective presetting of only relevant channels.
Solution Approach 2:
Instead of scanning and presetting all channels as in conventional systems, the patent inverts the approach by scanning all channels but presetting only those that do NOT belong to the original broadcast area. This inverted selection criterion prevents unnecessary presets while ensuring new area channels are captured.
2Productivity
If a scan is performed at the border between broadcast areas, then channels in the original area may be scanned and preset, but the vehicle is moving away from that broadcast area making reception impossible
Solution Approach 1:
The patent extracts and excludes channels belonging to the original broadcast area from the presetting operation. By identifying channels with area codes matching the original area and removing them from the preset list, the system eliminates unnecessary preset operations and associated time losses while maintaining efficient scanning.
Solution Approach 2:
The patent performs a complete channel scan (excessive action) but applies selective presetting (partial action) by filtering out original area channels. This approach ensures no potentially useful new area channels are missed while avoiding the waste of presetting unusable original area channels.
3Quantity of substance
If all frequencies are scanned to update preset memory, then comprehensive channel coverage is achieved, but scan time increases and unnecessary channels are stored
Solution Approach 1:
The patent segments the frequency spectrum into original area channels and new area channels during scanning. By categorizing channels based on area code comparison, the system processes all frequencies comprehensively but only presets the relevant subset, reducing the effective number of preset operations and associated time consumption.
Solution Approach 2:
Instead of presetting channels by default and excluding later, the patent inverts the process by scanning all frequencies but presetting only channels that should be received. This inverted approach achieves comprehensive coverage verification while minimizing unnecessary presets and scan time waste.
Data Source
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AI summary
A digital broadcast receiving apparatus includes: a scan processing unit (12) configured to scan channels, except for channels whose area codes coincide with a current area code, if a reception strength of a channel currently being received has become a predetermined value or lower; and a preset update unit (13) configured to store, in a preset memory (10), the receivable channels extracted by performing the scan.