Tactile Communication Frequency Conversion to Reduce Howling
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Solution Overview
Problem
In bidirectional tactile transmission systems, howling and loopback of contact signals occur due to the natural vibration of the housing, which affects the quality of tactile information transmission.
Innovation Solution
A tactile transmission system that includes a vibration measurement unit, a calculation unit to determine perception information, a conversion unit to adjust the signal frequency, and a signal output unit to generate an output vibration at a frequency different from the natural vibration, thereby reducing howling and loopback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-pass filter is used to suppress signals in the natural vibration frequency band, then howling is reduced, but the quality of tactile information deteriorates
Solution Approach 1:
The patent changes the frequency parameter of the actuator drive signal to be distinct from the natural vibration frequency of the housing. By operating at a different frequency, the system avoids resonance-induced howling while preserving the full bandwidth of tactile information without requiring aggressive filtering that would degrade signal quality.
2Power
If the actuator is driven near the natural vibration frequency of the housing, then tactile presentation is enhanced, but howling and loopback occur
Solution Approach 1:
The patent modifies the drive frequency parameter of the actuator to be distinct from the natural vibration frequency of the housing. This frequency separation eliminates the feedback loop that causes howling while maintaining effective tactile presentation through optimized actuator driving at the new frequency.
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 system effectively reduces howling and loopback in bidirectional tactile transmission by modulating the actuator signal to a frequency distinct from the housing's natural vibration, maintaining perception information quality.
Implementation Method 1
a vibration measurement unit that measures a vibration generated at the tactile transmission device
Implementation Method 2
a conversion unit that converts a signal related to the vibration into a predetermined frequency while maintaining the perception information calculated by the calculation unit
Implementation Method 3
a signal output unit that causes a vibrator of the different tactile transmission device to output a converted signal converted by the conversion unit as an output vibration
Data Source
AI summary
A tactile transmission system (100) including a tactile transmission device (3) and a different tactile transmission device (3) includes a vibration measurement unit (31) that measures a vibration generated at the tactile transmission device (3), a calculation unit that calculates perception information specified from the vibration measured by the vibration measurement unit (31), a conversion unit that converts a signal related to the vibration into a predetermined frequency while maintaining the perception information calculated by the calculation unit, and a signal output unit that causes a vibrator (32) of the different tactile transmission device (3) to output a converted signal converted by the conversion unit as an output vibration. A bidirectional tactile transmission system including a tactile transmission device and a different tactile transmission device includes: a vibration sensor configured to measure a vibration generated at the tactile transmission device; a calculator configured to calculate perception information specified from the vibration measured by the vibration sensor; a convector configured to convert a signal related to the vibration into a predetermined frequency while maintaining the perception information calculated by the calculator; and signal output processor circuitry configured to cause a vibrator of the different tactile transmission device to output a converted signal converted by the converter as an output vibration, wherein, similarly, the different tactile transmission device causes a vibrator of the tactile transmission device to output a vibration generated at the different tactile transmission device as an output vibration.