Acoustic Tracking Base Station for Digital Pen Positioning
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Solution Overview
Problem
Conventional digital pen systems for note-taking are cumbersome and lack the feel of real writing, with electronic notepads being expensive due to onboard processing circuitry and inconvenient data transfer methods, and struggle to accurately track the position of the digital pen relative to the base station, leading to misalignment of drawn objects.
Innovation Solution
An acoustic tracking system that uses a plurality of receivers to detect acoustic signals from transmitters on a digital pen and a base station, determining a three-dimensional position of the digital pen relative to the base station and projecting it onto a two-dimensional plane to record the pen's movement accurately, allowing for proper alignment of drawn objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electronic notepads are used with onboard processing circuitry, then the system can process and track pen position locally, but the device becomes expensive and consumes a lot of power
Solution Approach 1:
The patent extracts the processing function from the portable notepad and relocates it to the base station. The notepad only contains simple acoustic receivers, while the complex signal processing, position calculation, and data transfer functions are performed by the base station's processing component, thereby eliminating the need for expensive onboard circuitry and reducing power consumption in the portable device.
Solution Approach 2:
The patent introduces a base station as an intermediary device that performs the complex processing functions. The base station receives acoustic signals from the notepad, processes them to determine pen position, and manages data transfer to the computer. This intermediary approach allows the portable notepad to remain simple and low-power while still achieving accurate position tracking.
2Loss of information
If conventional electronic notepads tether to computer for data transfer, then data can be transferred to computer, but the user experience becomes inconvenient
Solution Approach 1:
The base station automatically performs data transfer to the computer without requiring user intervention. The system self-manages the connection and data transmission processes, eliminating the need for users to manually tether or disconnect devices, thereby significantly improving ease of operation while maintaining reliable data transfer.
3Manufacturing precision
If acoustic tracking system projects 3D position onto 2D plane, then drawn objects align properly with notepad, but the system complexity increases
Solution Approach 1:
The patent replaces complex mechanical alignment systems (such as fold covers or physical attachments) with an acoustic field-based tracking system. By using acoustic signals to determine three-dimensional position and projecting it onto the two-dimensional notepad plane, the system achieves precise alignment without requiring complex mechanical structures, thereby reducing overall system complexity while maintaining high alignment precision.
4Measurement precision
If digital pen system uses additional hardware like fold covers, then pen position can be tracked accurately, but the device becomes more complex and cumbersome
Solution Approach 1:
The patent eliminates the need for mechanical alignment hardware like fold covers by substituting it with acoustic field-based tracking. The acoustic receivers and transmitters work together to determine pen position in three-dimensional space, projecting it accurately onto the notepad plane without requiring any additional mechanical components, thereby reducing device complexity while maintaining tracking accuracy.
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
The acoustic tracking system enables accurate and convenient tracking of the digital pen's position, ensuring proper alignment of drawn objects even when the notepad is moved, reducing the need for additional hardware like fold covers and minimizing power consumption by processing signals on a computing device rather than the pen or base station.
Implementation Method 1
a first plurality of receivers that detects first acoustic signals from a first set of transmitters disposed on a digital pen and a second plurality of receivers that detects second acoustic signals from a second set of transmitters disposed on a base station
Data Source
AI summary
An acoustic tracking system is provided that includes receivers that detect first acoustic signals from a first set of transmitters disposed on a digital pen and second acoustic signals from a second set of transmitters disposed on a base station. The acoustic tracking system also includes a processing component that defines a two-dimensional plane on which the base station lies and determines a three-dimensional position of the digital pen relative to the base station. The processing component projects the three-dimensional position of the digital pen onto the two-dimensional plane and records, based on the projected three-dimensional position, the three-dimensional position of the digital pen relative to the base station, where the recorded three-dimensional position of the digital pen represents an object representative of movement of the digital pen.