Vehicle Proximity Notification Device Phase Control
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Solution Overview
Problem
Low-noise vehicles like electric and hybrid vehicles pose a challenge as pedestrians may not notice their approach, and existing notification systems can cause discomfort to passengers by allowing sound to enter the vehicle interior.
Innovation Solution
A vehicle proximity notification device using a first and second speaker with a sound source and an information processor that changes the phase of the signal input to each speaker based on the vehicle's speed, adjusting the directivity to minimize sound radiation into the vehicle interior while ensuring adequate notification outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phase difference is applied among notification sounds from multiple speakers, then sound position can be controlled or sound can be canceled, but the system complexity increases
Solution Approach 1:
The system dynamically changes the phase parameter of notification sounds output from multiple speakers based on vehicle operating conditions such as speed and direction. By adjusting the phase parameter in real-time, the system achieves flexible sound position control and directional steering without requiring complex mechanical adjustments, thereby balancing operational flexibility with system simplicity.
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 solution effectively reduces passenger discomfort by controlling sound directivity, ensuring notification sounds are directed away from the vehicle interior when in motion and maintaining sufficient notification around the vehicle when stationary.
Implementation Method 1
an information processor that changes a phase of at least one signal out of a signal input to the first speaker and a signal input to the second speaker in accordance with a speed of the vehicle
Implementation Method 2
giving a phase difference among each of notification sounds output from a plurality of speakers to move a position at which a sound output from a plurality of speakers can be heard or cancel out the sound
Data Source
AI summary
A vehicle proximity notification device for notifying a vehicle approach using a first speaker and a second speaker provided in the vehicle includes a sound source that outputs a signal that corresponds to a sound for notifying an approach of the vehicle and that is input to the first speaker and the second speaker; and an information processor that changes a phase of at least one signal out of a signal input to the first speaker and a signal input to the second speaker in accordance with a speed of the vehicle.