Capacitive Sensor Contact Detection for Voice Activity Accuracy
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Solution Overview
Problem
Existing voice activity detectors (VADs) require complete contact with the user's head to function properly, leading to inaccurate voice activity detection and subsequent noise filtering issues if not properly positioned, as they lack feedback on correct positioning.
Innovation Solution
The use of capacitive sensors to determine contact with the user's skin, ensuring that voice activity detection is only processed when both the capacitive sensor and the VAD sensor are in contact, enhancing the reliability of voice activity detection and positioning in telecommunications headsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical means is used to ensure contact between the VAD sensor and user skin, then the contact reliability is improved, but the user cannot receive feedback on proper positioning
Solution Approach 1:
The patent applies feedback by incorporating a capacitive sensor that detects whether the VAD sensor is properly positioned on the user's skin. The system provides feedback to the user through the headset interface, indicating when the sensor is not in proper contact. This resolves the contradiction by maintaining reliable contact detection while adding positioning feedback capability that was previously absent.
2Measurement precision
If the VAD sensor requires complete contact with the user head to function, then the detection accuracy is improved, but the ease of operation deteriorates due to improper positioning issues
Solution Approach 1:
The capacitive sensor provides real-time feedback to the user about proper sensor positioning. When the VAD sensor is not in complete contact with the user's head, the feedback mechanism alerts the user to reposition the sensor. This maintains high detection accuracy requirements while significantly improving ease of operation by guiding users through proper sensor placement.
Solution Approach 2:
The system performs preliminary contact detection using the capacitive sensor before initiating voice activity detection. This preliminary check ensures the VAD sensor is properly positioned on the user's skin before the main detection function is activated. This prevents inaccurate detection while making the system more user-friendly by catching positioning issues early.
3Device complexity
If no feedback mechanism is provided for sensor positioning, then the device complexity is reduced, but the reliability of voice activity detection deteriorates when sensor positioning is incorrect
Solution Approach 1:
The capacitive sensor serves multiple functions: it detects proper sensor positioning, provides feedback to the user, and validates before initiating voice activity detection. By making the sensor system multi-functional, the patent improves detection reliability without proportionally increasing device complexity, as the same sensor component performs multiple critical roles.
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 approach improves the accuracy and reliability of voice activity detection, ensuring proper headset placement and operation by providing feedback on correct positioning, thus enhancing the effectiveness of noise reduction in voice processing algorithms.
Implementation Method 1
A capacitive sensor provides a capacitive sensor output signal, and detects whether the capacitive sensor is in contact with a user skin
Implementation Method 2
The voice activity detector sensor provides a voice activity detector sensor output signal, and detects vibration of human tissue associated with user speech
Data Source
AI summary
A voice activity detection apparatus having a capacitive sensor and a voice activity detector sensor. The voice activity detector sensor detects vibration of human tissue associated with user speech. Utilization of the voice activity detector sensor output is tied to the output of the capacitive sensor, where the capacitive sensor detects whether it is in contact with user skin.