Vehicle Object Detection Suppressing Warning Sound Interference
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Solution Overview
Problem
Existing object detection devices mounted on vehicles may mistakenly detect warning sounds generated by the vehicle as sounds from approaching objects, leading to degraded detection accuracy.
Innovation Solution
An object detection device that performs frequency analysis on sound information and suppresses object detection in frequency bands with high sound pressure from warning sounds, using all frequency bands when warning sounds are not generated, and adjusts frequency bands based on changing warning sound characteristics over time to prevent mistaken detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the object detection device collects all sound information including warning sounds, then the detection coverage is improved, but the detection accuracy deteriorates due to mistaken identification of warning sounds as approaching objects
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency bands and processes each band separately. By dividing the sound detection into frequency-specific channels, the system can apply different detection thresholds and algorithms to each band, thereby maintaining comprehensive detection coverage while preventing warning sounds in specific frequency ranges from causing false positives.
Solution Approach 2:
The patent applies local quality by making the detection sensitivity and processing characteristics specific to each frequency band. Different frequency bands have different detection parameters and thresholds tailored to their characteristics, allowing the system to optimize detection accuracy locally in each band while maintaining overall system versatility.
2Device complexity
If the detection device uses a fixed frequency band for object detection, then the detection process is simplified, but the detection accuracy deteriorates when warning sounds with varying frequency characteristics are present
Solution Approach 1:
The patent implements dynamic frequency band selection and processing where the detection parameters are adjusted based on the actual frequency characteristics of detected sounds. The system dynamically adapts its detection strategy to match the frequency content of incoming sounds, whether they are warning sounds or approaching vehicle sounds, thereby maintaining accuracy without requiring overly complex fixed-parameter systems.
Solution Approach 2:
The patent changes detection parameters such as frequency band selection, threshold levels, and processing algorithms based on the characteristics of the detected sounds. By dynamically adjusting these parameters according to whether warning sounds or approaching vehicle sounds are detected, the system achieves high detection accuracy while keeping the overall process manageable.
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
The device accurately detects objects around the vehicle by preventing the warning sound from being mistakenly identified as an approaching object, even when warning sounds are intermittently generated or have changing frequency characteristics, thereby enhancing detection accuracy.
Implementation Method 1
a sound collecting unit 10 mounted on the vehicle
Implementation Method 2
an analysis unit configured to perform frequency analysis on sound information collected by the sound collecting unit
Data Source
AI summary
A sound collecting unit (10) mounted on a vehicle is configured to collect sounds, a frequency resolution unit (21c) is configured to perform frequency analysis on the collected sound information, and when an object around the vehicle is detected based on a frequency characteristic of the sound information, a traveling sound detecting unit (21d) is configured to perform object detection such that object detection using a predetermined frequency band when a sound pressure of the predetermined frequency band is high in a frequency characteristic of a sound reproduced from a reproduction unit (11) mounted on the vehicle is more suppressed than object detection using a predetermined frequency band when a sound pressure of the predetermined frequency band is low in the frequency characteristic of the sound reproduced from a reproduction unit (11).