Force Touch Button Emulation Using Dual Low-Pass Filters
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Solution Overview
Problem
Electronic devices with force sensing capabilities face challenges in distinguishing between slow, deliberate force inputs and quick, strong inputs due to noise interference, which affects response times and accuracy in detecting discrete events.
Innovation Solution
The use of multiple low-pass filters with different bandwidths and sampling rates to filter noise and differentiate between slow and quick force inputs, allowing for precise and fast response times by concurrently processing force signals through a first low-pass filter with a smaller bandwidth and a second low-pass filter with a larger bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise filtering is applied to force signals, then measurement precision is improved, but response time increases due to latency
Solution Approach 1:
The patent divides the force signal processing into multiple parallel filtering paths, each with different bandwidth characteristics. A first low-pass filter with narrower bandwidth provides precise noise filtering for slow, deliberate inputs, while a second low-pass filter with wider bandwidth quickly processes quick, strong inputs. This segmentation allows the system to achieve both high measurement precision and fast response time by selecting the appropriate filter path based on input characteristics.
2Device complexity
If a single low-pass filter is used, then device complexity is reduced, but the ability to distinguish between different types of force inputs deteriorates
Solution Approach 1:
The patent applies different filtering characteristics to different signal components by using multiple low-pass filters with distinct bandwidths. The first filter with narrower bandwidth is optimized for detecting slow, deliberate force inputs, while the second filter with wider bandwidth is optimized for quick, strong inputs. This local quality differentiation enables the system to accurately detect and distinguish between different types of force inputs without requiring overly complex processing.
Data Source
AI summary
Disclosed herein is an electronic device having a force sensing device. The force sensing device receives a continuous force input which is translated into a discrete event. In order to more accurately determine when the discrete event is to occur, the electronic device includes a two low-pass filters that concurrently receive a force signal from the force sensing device. The first low-pass filter has a first bandwidth and the second low-pass filter has a second bandwidth that is greater than the first bandwidth. The two low-pass filters filter the force signal to provide a user interface with a precise feel for slower more deliberate input while also providing fast response times for stronger, shorter input.