Ultrasonic Sound Array for Dynamic Listener Tracking
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Solution Overview
Problem
Ultrasonic loudspeakers generate high-frequency sound waves that are not perceivable by humans and cannot effectively direct sound to a moving audience, as the sound waves are not audible and do not cover a wide enough range to reach individuals at varying angles.
Innovation Solution
A directional sound playing system comprising multiple ultrasonic sound sources installed on a supporting body, with a setting module to determine the orientation and number of sound sources based on the receiver's location and movement, and a driving control module to select and power the appropriate sound sources to ensure continuous sound coverage across 360 degrees, using a combination of software programs and hardware configurations to manage the distribution and power of ultrasonic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a single ultrasonic loudspeaker is used to direct sound to a precise position, then sound directionality is improved, but the system cannot track moving receivers and maintain continuous sound coverage
Solution Approach 1:
The system divides the ultrasonic sound source into multiple independent transducers arranged in an array. Each transducer can be independently controlled to direct sound waves, allowing the system to segment the sound coverage area and assign different transducers to different angular sectors, thereby tracking moving receivers effectively
Solution Approach 2:
The system dynamically adjusts the activation and orientation of different ultrasonic transducers based on the real-time position of the receiver. By dynamically switching between transducers and adjusting their directional patterns, the system maintains continuous sound coverage as the receiver moves through different angular positions
2Adaptability or versatility
If multiple ultrasonic sound sources are distributed across a wide area to cover all angles, then sound coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The system employs periodic scanning of angular sectors using a limited number of ultrasonic transducers. By sequentially directing sound waves across different angular positions in a periodic manner, the system achieves wide-area coverage equivalent to having transducers at all positions, while actually using far fewer physical components
Solution Approach 2:
Each ultrasonic transducer in the array is designed to perform multiple functions: it can direct sound to different angular positions by adjusting its orientation, serve as an active element in the phased array for beam forming, and be dynamically activated or deactivated based on receiver position. This multi-functionality reduces the total number of transducers needed compared to a static full-coverage system
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 ensures that ultrasonic sound waves can be consistently received by a receiver regardless of its position or movement, providing effective sound coverage by dynamically adjusting the number and orientation of ultrasonic sound sources to maintain auditory contact across a wide range.
Implementation Method 1
Ultrasonic loudspeaker does not produce ordinary, audible sound waves with a single, moving, electromagnetic coil and cone. Instead, it generates ultrasound (high-frequency sound waves)
Data Source
AI summary
A directional sound playing system using ultrasonic sound sources, the ultrasonic sound sources being installed on a surface of a supporting body. The directional sound playing system includes a setting module, a first detecting module, and a driving control module. The setting module sets a distribution position of each of the ultrasonic sound sources on the surface of the supporting body according to the angle of output of each of the ultrasonic sound sources and a requirement angle of a listener. The first detecting module obtains location information of the listener. The driving control module selects and drives one or more ultrasonic sound sources to transmit and direct ultrasonic sound corresponding to the location information of the listener. A directional sound playing method is also provided.