Tactile Sound Device Active Feedback Loop
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Solution Overview
Problem
Tactile sound devices under dynamic loading conditions, such as those experienced when worn or used by individuals, face challenges in maintaining a consistent frequency response due to variations in body composition and movement, leading to undesirable audio characteristics like phase shift, harmonic distortions, and resonance.
Innovation Solution
Incorporating an electroactive transducer with an active feedback control loop and integral amplifier, along with sensors like accelerometers, position sensors, and force sensors, to monitor and adjust the frequency response in real-time, ensuring optimal audio delivery by comparing input and output signals and adjusting the transducer's operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electroactive transducer is used in a tactile sound device under dynamic loading conditions, then the device can provide tactile audio experience, but the frequency response becomes inconsistent due to variations in body composition and movement
Solution Approach 1:
The patent implements an active feedback control loop that continuously monitors the frequency response of the electroactive transducer and adjusts the input signal to compensate for variations caused by dynamic loading conditions. Sensors detect changes in body composition and movement, and the control system modifies the electrical signal in real-time to maintain consistent frequency response characteristics.
Solution Approach 2:
The system transitions from static to dynamic operation by continuously adapting the transducer's input signal based on real-time conditions. The feedback control loop enables the system to respond dynamically to changing body composition and movement, adjusting parameters such as signal amplitude and frequency to maintain optimal performance under varying loads.
2Ease of operation
If the transducer operates under dynamic loading conditions, then the device can be worn or used by individuals, but undesirable audio characteristics like phase shift, harmonic distortions, and resonance occur
Solution Approach 1:
The feedback control loop specifically targets and corrects undesirable audio characteristics by monitoring the transducer's output and adjusting the input signal to eliminate phase shift, harmonic distortions, and resonance. The system detects these harmful factors and applies compensatory adjustments in real-time.
Solution Approach 2:
The system converts the harmful effects of dynamic loading conditions into useful information by using sensors to detect variations in body composition and movement. This information is then used by the feedback control loop to adjust the signal and maintain optimal audio characteristics, turning the previously harmful variable conditions into a basis for optimization.
3Manufacturing precision
If equalization scheme is used for static loading conditions, then the frequency response can be predictably set, but it cannot account for dynamic variations in body composition and movement
Solution Approach 1:
The system combines the initial equalization setup with continuous feedback adjustment. The static equalization provides a baseline frequency response, while the active feedback loop continuously modifies this baseline to account for dynamic variations in body composition and movement, merging the benefits of both predetermined and adaptive approaches.
Solution Approach 2:
The system performs preliminary equalization setup to establish a baseline frequency response before operation. This preliminary configuration is then refined and continuously adjusted by the feedback control loop during actual use, allowing the system to benefit from both predetermined optimization and real-time adaptation.
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 solution maintains a consistent and optimal frequency response, reducing distortions and ensuring safe operation of the transducer, providing an accurate tactile audio experience by dynamically adjusting to changing conditions.
Implementation Method 1
The aforementioned example sound devices may include at least one electroactive transducer that converts electrical signals from at least one control system, for example a control box into vibratory motion.
Implementation Method 2
a first sensor to monitor the vibrations of the transducer
Implementation Method 3
the electroactive transducer includes an active feedback control loop and amplifier; and wherein the active feedback control loop and amplifier are integral with the electroactive transducer
Data Source
AI summary
A tactile sound device includes a transducer to convert an electrical signal into motion. One or membranes are coupled to the transducer and are adapted to transfer vibrations from the transducer to a user's body. A first sensor monitors the vibrations of the transducer. One or more circuits generate the electrical signal based on a signal received from the first sensor that monitors the vibrations of the transducer.