Portable Navigation Device TV Function Dual Processing Units
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Solution Overview
Problem
Current portable navigation devices (PNDs) with TV functions face challenges such as high costs, complex design, high power consumption, and inefficient concurrent execution of navigation and TV functions due to either independent processing modules or the need for a single powerful processing unit.
Innovation Solution
A PND design featuring dual processing units that share common system resources, with communication achieved through interrupt or reset signals, allowing each unit to handle navigation and TV functions independently, reducing power consumption by switching between normal and power-saving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent processing modules are used for navigation and TV functions, then functional independence is improved, but device complexity and cost increase
Solution Approach 1:
The system is divided into two independent processing modules: a first processing module for navigation functions and a second processing module for TV functions. Each module operates independently with its own control logic, allowing functional segmentation while sharing common hardware resources through a bus interface, thus reducing overall system complexity compared to fully independent modules.
Solution Approach 2:
Both processing modules share common hardware resources including display interface, sound interface, data bus, and storage module. This multi-functional sharing approach allows the system to achieve functional independence for navigation and TV operations while reducing device complexity and cost by eliminating duplicate dedicated components for each function.
2Adaptability or versatility
If two independent processing modules are used for navigation and TV functions, then functional independence is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between processing modules based on the active function. When navigation is active, the first processing module operates while the second is in low-power mode, and vice versa for TV functions. This dynamic activation approach maintains functional independence while significantly reducing power consumption compared to having both modules continuously active.
Solution Approach 2:
The processing modules operate in periodic alternation rather than continuous simultaneous operation. The system activates the appropriate processing module based on the current function requirement, allowing the inactive module to enter power-saving states. This periodic activation pattern reduces overall power consumption while preserving the capability for independent navigation and TV functionality.
3Device complexity
If a single powerful processing unit is used for both navigation and TV functions, then device complexity is reduced, but concurrent execution capability deteriorates
Solution Approach 1:
The processing functionality is segmented into two specialized processing modules rather than using a single general-purpose unit. Each module is optimized for its specific function (navigation or TV), enabling concurrent execution of both functions simultaneously while maintaining simpler, more efficient processing architectures for each task.
Solution Approach 2:
The system changes the processing parameter from a single high-performance unit to multiple specialized units with different processing capabilities. This parameter change allows the system to achieve better concurrent execution performance by distributing processing loads across multiple modules, each handling their respective functions independently without resource contention.
4Device complexity
If a single powerful processing unit is used for both navigation and TV functions, then device complexity is reduced, but power consumption increases
Solution Approach 1:
Processing functionality is segmented into two separate modules that can be independently controlled and powered. This segmentation allows the system to activate only the required processing module for each function, reducing overall power consumption compared to a single powerful unit that must remain continuously active to handle both functions.
Solution Approach 2:
The system implements dynamic power management where processing modules are activated or deactivated based on the current functional requirement. This dynamic approach maintains simple device structure while reducing power consumption by ensuring that processing power is only consumed when and where needed, rather than continuously in a single powerful unit.
Data Source
AI summary
A portable navigation device with a TV function includes a TV module, a navigation module, a display module, a sound module, a first processing unit, a second processing unit and a TV command storage module. The TV module generates baseband TV signals, the navigation module generates position information, the display module displays image information, the sound module plays sounds, the first processing unit performs navigation programs, the second processing unit performs TV programs, and the TV command storage module stores TV commands from the first processing unit and the second processing unit. TV command transmission between the first processing unit and the second processing unit is achieved by sending interrupt signals or reset signals.