Headrest Acoustic Microphone Recess for Voice Recognition Accuracy
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Solution Overview
Problem
Conventional headrests experience reduced accuracy of voice recognition due to the proximity of acoustic microphones to acoustic speakers, as sound generated by the speakers is collected by the microphone, interfering with voice recognition processes.
Innovation Solution
The headrest design features an acoustic microphone positioned in a recessed portion of the core member, with its sound collection surface located rearward of the acoustic speaker's vibrating surface, and additional features such as flock coating, rubber coating, or emboss processing on the recessed portion's inner wall to minimize sound interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the acoustic microphone is disposed side by side with the acoustic speaker on the surface of the core member, then the device complexity is reduced, but the voice recognition accuracy deteriorates due to sound interference
Solution Approach 1:
The patent transitions from a two-dimensional surface arrangement to a three-dimensional configuration by creating a recessed portion that extends backward from the surface. The acoustic microphone is positioned within this recessed space, placing it in a different depth dimension relative to the speaker, thereby spatially separating the microphone from the speaker's sound field while maintaining a compact overall structure.
Solution Approach 2:
The recessed portion acts as an intermediary structure that mediates between the speaker and microphone. By positioning the microphone within this recessed space and configuring its sound collection surface to face rearward, the design creates an intermediate acoustic environment that prevents direct sound interference from the speaker while allowing the microphone to function effectively.
2Area of stationary object
If the acoustic microphone is positioned near the acoustic speaker, then the area occupied by the headrest is reduced, but sound from the speaker interferes with the microphone's voice recognition function
Solution Approach 1:
Instead of increasing lateral separation distance, the patent utilizes the depth dimension by creating a recessed portion that extends backward from the headrest surface. This allows the microphone to be positioned close to the speaker in plan view while maintaining vertical and depth-based separation, thus reducing sound interference without increasing the overall footprint area.
Solution Approach 2:
The recessed portion creates a localized acoustic environment with different acoustic properties compared to the external space. The configuration of the recessed portion, including its depth and the orientation of the microphone's sound collection surface, creates a specific acoustic zone that protects the microphone from direct sound interference while maintaining compact dimensions.
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 maintains accurate voice recognition by preventing sound from the speakers from being collected by the microphone, enhancing the accuracy of voice recognition even when the microphone is near the speakers.
Implementation Method 1
an acoustic microphone 52 that collects sound and converts the sound into an electric signal
Implementation Method 2
acoustic speakers 25a and 25b that generate sound based on an audio signal
Data Source
AI summary
In a headrest including a core member, an acoustic speaker, and an acoustic microphone, the acoustic microphone is provided in a recessed portion provided in the core member, and a sound collection surface of the acoustic microphone is provided in a position rearward of a vibrating surface of the acoustic speaker. An opening at a tip end of the recessed portion can be provided in a position forward of a tip end of the vibrating surface of the acoustic speaker. The recessed portion can be formed into a shape that narrows from the opening toward a bottom surface. Even when the acoustic microphone is provided near to the acoustic speaker, accuracy of voice recognition by the acoustic microphone can be prevented from being reduced.