Position Detection Device Signal Processing Segmentation
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Solution Overview
Problem
Existing position detection devices face challenges in improving the speed of pen position detection while maintaining noise reduction and avoiding increased circuit area and current consumption, particularly with simple parallelization of circuits.
Innovation Solution
The proposed solution involves a position detection device that samples and processes reception signals from multiple loop coils using a sampling circuit and arithmetic circuit, which classifies and combines real and imaginary parts of sampling data to calculate amplitude and phase, allowing for reduced transmission/reception times without compromising noise reduction or circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If simple parallelization of circuits is used to improve pen position detection speed, then detection speed is improved, but circuit area increases and current consumption increases
Solution Approach 1:
The patent segments the signal processing task by dividing reception signals into multiple groups and processing them in sequential stages rather than requiring all signals to be processed simultaneously. This allows faster detection speed without requiring proportionally more parallel circuit resources, thus avoiding the linear increase in circuit area that would result from simple parallelization.
2Speed
If simple parallelization of circuits is used to improve pen position detection speed, then detection speed is improved, but current consumption increases
Solution Approach 1:
By segmenting the reception signals into groups and processing them sequentially through multiple stages, the patent reduces the number of circuits that need to operate simultaneously at full power. This staged processing approach maintains fast detection speed while significantly reducing peak current consumption compared to simple parallelization where all circuits would operate simultaneously.
3Speed
If transmission/reception time is reduced to improve detection speed, then detection speed is improved, but noise reduction effectiveness decreases
Solution Approach 1:
The patent segments reception signals into multiple groups and performs repeated measurements on each group sequentially. By processing multiple signal groups through the same circuit in succession rather than requiring longer simultaneous reception, the system achieves effective noise reduction through averaging multiple measurements while maintaining short transmission/reception time windows for each measurement.
Solution Approach 2:
The patent implements periodic action by repeatedly measuring signals from multiple loop coils in sequential stages across different time periods. This periodic measurement approach allows noise reduction through averaging of multiple periodic measurements while keeping each individual transmission/reception event short, thus maintaining fast detection speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables faster pen position detection with reduced transmission/reception times, maintaining equivalent noise reduction and circuit efficiency, and supports downward compatibility with existing pens having multiple resonance frequencies.
Implementation Method 1
A position detection device and a position indicator (typically, a pen) of an electro magnetic resonance (EMR) method are known
Implementation Method 2
a sampling circuit samples a reception signal received by one loop coil
Implementation Method 3
the arithmetic circuit adds together real parts of sampling data belonging to a group and adds together imaginary parts of sampling data belonging to the group for each group, and then calculates amplitude and phase of the signal
Data Source
AI summary
The speed of pen position detection is improved without increasing the circuit area and the current consumption. A sampling circuit samples a signal and outputs sampling data. A arithmetic circuit calculates a real part and an imaginary part of the sampling data. The arithmetic circuit classifies the real part of the sampling data into one of a plurality of groups and classifies the imaginary part of the sampling data into one of the groups according to an order of output of the sampling data from the sampling circuit. Then, the arithmetic circuit adds together real parts of sampling data belonging to a group and adds together imaginary parts of sampling data belonging to a group for each of the groups, and calculates amplitude and phase of the signal by using an addition result of the real parts and an addition result of the imaginary parts of each of the groups.