Digital Broadcast Reception Apparatus Adaptive Mode Switching
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Solution Overview
Problem
Digital broadcast reception apparatuses in mobile objects face challenges with reception state deterioration due to movement, leading to interrupted viewing as they often require manual channel scans and lack seamless switching between diversity and independent reception modes, resulting in potential loss of signal before alternative channels can be detected.
Innovation Solution
A digital broadcast reception apparatus with primary and secondary systems that switch between diversity and independent reception modes based on current position and broadcast area information, using tuning control to select appropriate operation modes for stable viewing, even in changing reception environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the digital broadcast reception apparatus starts searching another channel in a different system when reception state deteriorates, then another channel may be found, but the reception state is further deteriorated because a diversity process cannot be performed on the current viewing system
Solution Approach 1:
The invention dynamically switches between diversity operation mode and independent reception operation mode based on reception state. When reception deteriorates, the system transitions from diversity mode (where both systems process the same channel) to independent reception mode (where the secondary system searches alternative channels while the primary system maintains current viewing), thereby adapting the system behavior to current reception conditions without compromising ongoing service
Solution Approach 2:
The invention segments the reception systems into primary and secondary systems with distinct functional roles. The primary system is dedicated to maintaining current viewing service, while the secondary system performs channel searching when needed. This segmentation allows the systems to operate independently without interfering with each other's functions, resolving the contradiction between search capability and reception stability
2Loss of energy
If another channel is searched only when reception state deteriorates, then search resources are conserved, but in cases of rapid deterioration the reception may become impossible prior to detection of another channel
Solution Approach 1:
The invention prepares the secondary system in advance by keeping it in standby mode with channel search capability ready. When reception deterioration is detected, the secondary system can immediately begin searching alternative channels without delay. This preliminary preparation ensures that channel search can start instantly when needed, preventing reception interruption even in rapid deterioration scenarios
3Device complexity
If manual channel scan is required when reception deteriorates, then system complexity is reduced, but user convenience deteriorates and viewing cannot be continued seamlessly
Solution Approach 1:
The invention implements automatic channel search and switching functionality where the system autonomously detects reception deterioration, initiates channel searching in the secondary system, and switches to alternative channels without user intervention. This self-service capability maintains simple system structure while providing seamless viewing continuity, eliminating the need for manual channel scanning by users
Data Source
AI summary
An object of the present invention is to provide a digital broadcast reception apparatus that allows a stable viewing even if a reception environment changes along with a movement. In the present invention, based on current position information indicating a current position detected by a current position detection section and broadcast area information stored in a broadcast area information storage section, a search-mode switching control section instructs a tuning control section to select a diversity operation mode if the current position is close to a boundary of a broadcast area, and select an independent reception operation mode if the current position is not close to the boundary of the broadcast area. In the diversity operation mode, a first system and a second system are tuned to the same physical channel, and cooperate with each other to demodulate a digital broadcast signal and a make an output through a diversity process. In the independent reception operation mode, the first system and the second system individually and independently demodulate the digital broadcast signal and make an output.