Vibration Sensor Resonance for Bone Conduction Sensitivity
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Solution Overview
Problem
Current vibration sensors used as bone conduction microphones face challenges in receiving clear vibration signals from the human body due to their low sensitivity, resulting in poor voice quality, especially in noisy environments.
Innovation Solution
A vibration sensor design that includes a housing structure and an acoustic transducer with a vibration unit, which separates the acoustic cavity into two parts, allowing the housing structure to vibrate and change the volume of the second acoustic cavity, generating an electrical signal based on these vibrations. The vibration unit, comprising a mass element and an elastic element, is tuned to a specific resonant frequency range (800 Hz-8000 Hz) to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional vibration sensor is used to detect bone conduction vibrations, then the sensor can convert vibration signals to electrical signals, but the sensitivity is insufficient and voice quality deteriorates
Solution Approach 1:
The patent applies mechanical vibration resonance by designing a vibration unit with specific mass and elastic elements that resonate at frequencies matching human bone conduction (800-8000 Hz). This resonance amplifies the weak bone conduction vibrations, enabling the acoustic transducer to detect them effectively and convert to clear electrical signals, thus improving sensitivity without losing voice quality information
Solution Approach 2:
The patent changes the physical parameters of the sensing system by introducing a vibration unit with specific mass (0.001g-1g) and elastic strength (10-2000 N/m), and tuning the resonant frequency to 800-8000 Hz. These parameter adjustments optimize the sensor's response to bone conduction vibrations, transforming it from a conventional low-sensitivity sensor to a specialized high-sensitivity bone conduction detector
2Measurement precision
If the vibration sensor is designed with a resonant frequency of 800 Hz-8000 Hz to match bone conduction, then the sensitivity in this frequency range is improved, but the device complexity increases
Solution Approach 1:
The patent segments the vibration sensing function into distinct components: a mass element, an elastic element, and an acoustic transducer. This segmentation allows each component to be optimized independently for its specific function while working together to achieve the overall resonant frequency response, making the complex frequency-specific sensing achievable through modular design
Solution Approach 2:
The patent uses mechanical vibration resonance as the core mechanism to achieve frequency-specific sensitivity. By designing the mass-spring system to resonate at 800-8000 Hz, the system naturally amplifies vibrations in this frequency range without requiring complex electronic filtering or multiple sensors, thus achieving frequency-specific sensitivity with relatively simple mechanical structure
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 design improves the sensitivity of the vibration sensor within a specific frequency range, allowing for better voice recording and noise isolation in noisy environments by effectively converting body vibrations into clear electrical signals.
Implementation Method 1
the acoustic transducer may generate an electrical signal based on the volume change of the second acoustic cavity
Implementation Method 2
the vibration unit may act on the second acoustic cavity so that a resonance frequency of the vibration sensor is 800 Hz-8000 Hz
Data Source
AI summary
A vibration sensor (100) is provided, including a housing structure (110, 510, 610, 710, 810, 910, 1010, 1110, 1510, 1710) and an acoustic transducer (120, 520, 620, 720, 820, 920, 1020, 1120, 1220, 1320, 1420, 1520, 1720) physically connected to the housing structure (110, 510, 610, 710, 810, 910, 1010, 1110, 1510, 1710), wherein a first acoustic cavity (140, 1040) is formed at least partially by the housing structure (110, 510, 610, 710, 810, 910, 1010, 1110, 1510, 1710) and the acoustic transducer (120, 520, 620, 720, 820, 920, 1020, 1120, 1220, 1320, 1420, 1520, 1720), and a vibration unit (130) which is located in the first acoustic cavity (140, 1040), and separates the first acoustic cavity (140, 1040) into a second acoustic cavity (142, 542, 642, 742, 842, 942, 1042, 1142, 1242, 1342, 1442, 1542, 1642) and a third acoustic cavity (141, 941, 1041, 1141, 1541, 1641).