Microphone-Loudspeaker Integrated Apparatus for Vehicle Voice Recognition
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Solution Overview
Problem
Conventional emergency call systems in vehicles require vehicle-specific tuning for microphone and loudspeaker placement to ensure sound quality, increasing evaluation steps and costs.
Innovation Solution
A microphone-loudspeaker integrated apparatus with multiple microphones and a loudspeaker positioned between them, where the distance between microphones is optimized to balance sound frequency and noise from vibrations, using a synthesis unit to enhance voice recognition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between microphones is increased to collect higher frequency sounds, then voice recognition quality improves, but noise from loudspeaker vibration increases
Solution Approach 1:
The loudspeaker is positioned as an intermediary element between the microphones, serving dual purposes: it outputs voice information while simultaneously acting as a reference for noise cancellation. The noise generated by the loudspeaker is captured by the microphones and used to create a cancellation signal, thereby eliminating the harmful noise effect while maintaining the beneficial high-frequency sound collection.
Solution Approach 2:
The noise generated by the loudspeaker during voice output is converted from a harmful factor into a useful signal for noise cancellation. By capturing the loudspeaker's vibration noise with the microphones and using it to generate an anti-phase cancellation signal, the system transforms the harmful noise into a benefit that improves overall voice recognition quality.
2Manufacturing precision
If vehicle-specific tuning is performed for each vehicle type and audio grade, then sound quality is optimized, but evaluation steps and costs increase
Solution Approach 1:
The microphone-loudspeaker integrated apparatus is designed with universal applicability across different vehicle types and audio grades. By positioning the loudspeaker between microphones and utilizing its noise as a reference for cancellation, the system achieves effective voice recognition without requiring vehicle-specific tuning or additional evaluation steps, thereby simplifying the overall system while maintaining high performance.
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 configuration secures sound quality and improves voice recognition accuracy with a simple setup, reducing the need for vehicle-specific tuning and associated costs.
Implementation Method 1
The synthesis unit synthesizes sounds collected from the plurality of microphones when voice recognition is performed based on sound obtained through the synthesis
Data Source
AI summary
A microphone-loudspeaker integrated apparatus includes a plurality of microphones, a loudspeaker, and a synthesis unit. The loudspeaker is disposed between the plurality of microphones. The synthesis unit synthesizes sounds collected from the plurality of microphones. A distance between the plurality of microphones is set so as to fall within a range within which sound at a frequency needed for recognizing voice is collectable and within a range within which a noise amount due to vibration of the loudspeaker is allowable, when voice recognition is performed based on sound obtained through synthesis by the synthesis unit.