Tactile Drive Control Pre-Drive Timing Synchronization
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Solution Overview
Problem
Current tactile presentation devices experience delays in responding to drive voltage changes due to their large mass and low responsiveness, leading to delayed tactile stimulation and reduced reproducibility of tactile sensations.
Innovation Solution
A drive control device that executes a pre-drive, driving the tactile presentation device in advance based on timing-related information encoded in the tactile signal, such as rise timing and rise height, to synchronize the presentation with the signal's amplitude changes and human perception thresholds, thereby reducing delays and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration device is used to generate tactile stimulation, then tactile sensation can be produced, but the device has large mass and low responsiveness causing delay in tactile presentation timing
Solution Approach 1:
The control device performs preliminary actions by detecting rise timing and rise height of tactile signals in advance, calculating required pre-drive durations, and initiating drive signals before the tactile signal reaches its peak. This allows the vibration device to reach the desired vibration state by the time the tactile signal peak occurs, eliminating timing delays while maintaining reliable tactile sensation reproduction
2Speed
If drive voltage is temporarily overshot using a booster circuit, then responsiveness is improved, but the device complexity increases
Solution Approach 1:
Instead of using a booster circuit to temporarily overshoot drive voltage, the invention calculates the required pre-drive duration based on the vibration device's responsiveness characteristics and the detected tactile signal parameters. The control device initiates the drive signal in advance for the calculated duration, achieving improved responsiveness through temporal scheduling rather than voltage amplification, thereby avoiding additional circuit complexity
Solution Approach 2:
The invention changes the temporal parameter of the drive signal by introducing a pre-drive duration parameter calculated from the vibration device's responsiveness characteristics and the tactile signal's rise height. This parameter adjustment allows the system to achieve faster effective response without modifying the voltage amplitude or adding booster circuits, thus improving responsiveness while maintaining simple circuit architecture
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 solution effectively reduces delays in tactile presentation timing, enhances the reproducibility of tactile sensations, and synchronizes stimulation across multiple devices with varying responsiveness, improving user experience and power efficiency.
Implementation Method 1
a device having a resonance frequency at a frequency (about 100 Hz) with good sensitivity in the tactile sense of a human being such as an eccentric motor (ERM) or a linear actuator (LRA) is widely used
Data Source
AI summary
To prevent delay in tactile presentation timing due to the responsiveness of the tactile presentation device, and to improve the reproducibility of the tactile sense.A drive control device according to the present technology includes a drive control unit that causes a drive unit that drives a tactile presentation device by a drive signal based on a tactile signal to execute a pre-drive, which is to drive the tactile presentation device in advance with respect to a rise timing of the tactile signal. By the pre-drive described above, a timing at which a tactile presentation is actually started can be brought close to a rise timing of a tactile signal.