Parametric Speaker Audio Spot Formation for Localized Road Alerts
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Solution Overview
Problem
Existing audio spot formation techniques using ultrasound alert systems are limited by the inability to confine the alert sound to a specific region, leading to unintended noise exposure in urban or residential areas, which restricts their usage.
Innovation Solution
An audio spot forming system utilizing a combination of first and second parametric speakers to intersect sideband and carrier waves on a road, creating an audible alert only in a specific region, thereby reducing entry accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasound is emitted to alert drivers, then entry accidents are reduced, but noise is heard at many places due to reflection
Solution Approach 1:
The patent applies local quality by creating a focused audio spot at a specific location where the carrier wave and sideband wave intersect. The alert sound is generated only in this localized region on the road, allowing the warning to be heard by drivers in the construction zone without causing unintended noise exposure to surrounding areas through reflection.
Solution Approach 2:
The patent uses an intermediary approach by introducing a second parametric speaker that emits a carrier wave. This carrier wave interacts with the sideband wave from the first speaker to create a focused audio spot, serving as a mediator that enables precise spatial control of the alert sound and prevents unwanted noise propagation.
2Device complexity
If a single parametric speaker emits alert sound, then the system is simple, but the alert sound cannot be confined to a specific region
Solution Approach 1:
By using two parametric speakers emitting different wave types (sideband and carrier), the system achieves local quality control where the alert sound is confined to a specific intersection region. This resolves the contradiction by maintaining relatively simple device complexity while precisely controlling the spatial distribution of the alert sound.
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 system effectively reduces entry accidents by ensuring the alert sound is transmitted only to the driver in the specific region, minimizing noise exposure to others and enhancing safety.
Implementation Method 1
a first parametric speaker configured to emit a sideband wave, and a second parametric speaker configured to emit a carrier wave
Implementation Method 2
the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot
Data Source
AI summary
An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker (1) configured to emit a sideband wave, and a second parametric speaker (2) configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot.