Bone-Conduction Vibration Audio for Private In-Vehicle Guidance
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Solution Overview
Problem
Existing vehicular sound systems expose passengers to private conversations meant for the driver, and in-vehicle noise interferes with voice guidance recognition, potentially leading to accidents.
Innovation Solution
A vibration-generating apparatus with a microphone and sound processing circuit that generates a vibration driving signal to provide sound through bone conduction, allowing targeted sound delivery to the driver or passengers while reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sound is transmitted through vehicular speaker to all passengers, then information can be provided to all passengers, but privacy of driver is exposed and in-vehicle noise interferes with voice guidance recognition
Solution Approach 1:
The patent applies local quality by creating different acoustic zones within the vehicle cabin. The sound system delivers different audio content to different spatial locations - voice guidance is directed specifically to the driver's position while music or other content is directed to passenger areas. This spatial differentiation allows targeted sound delivery to specific recipients while preventing unintended exposure, thus resolving the contradiction between providing information to all passengers and protecting driver privacy.
Solution Approach 2:
The patent segments the audio output into separate channels directed to different locations. The sound system divides the acoustic field into multiple zones (driver zone, passenger zones) and transmits different audio signals to each zone simultaneously. This segmentation enables the driver to receive voice guidance privately while passengers receive different content, eliminating both privacy exposure and noise interference issues.
2Loss of information
If all sound information is output through vehicular speaker, then all passengers can receive information, but driver privacy is compromised and noise reduces voice guidance recognition accuracy
Solution Approach 1:
The patent applies preliminary action by pre-processing the audio signals to separate voice guidance content from other sound information before transmission. The system identifies and extracts voice guidance signals in advance, applies appropriate spatial filtering and directional processing, then directs them to the driver's position. This preliminary separation and processing of audio content enhances voice guidance recognition accuracy while maintaining a relatively simple overall system configuration.
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
Enables private sound transmission to the intended recipient and enhances noise reduction, ensuring accurate guidance recognition and safe driving conditions.
Implementation Method 1
generate a vibration driving signal, based on the sound source signal and the noise removal signal, and a vibration apparatus disposed at the object to vibrate based on the vibration driving signal to vibrate the object
Data Source
AI summary
A vibration generating apparatus may include: a microphone apparatus disposed at an object including a plurality of regions, the microphone apparatus being configured to receive noise near the object; a sound processing circuit configured to receive a sound source signal and a noise signal corresponding to the noise, generate a noise removal signal having an antiphase of the noise signal, and generate a vibration driving signal based on the sound source signal and the noise removal signal; and a vibration apparatus disposed at the object to vibrate based on the vibration driving signal to vibrate the object. The noise may be offset and removed by a vibration of the vibration apparatus generated based on the noise removal signal, and a sound source generated by a vibration of the vibration apparatus based on the sound source signal may be received by a user through bone conduction.