Directional Loudspeaker Arrays for Vehicle Audio Isolation
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Solution Overview
Problem
Existing audio systems in vehicles fail to effectively isolate audio signals for multiple listeners, leading to interference and suboptimal audio quality due to the lack of precise control over directional loudspeaker arrays, especially in complex vehicle environments.
Innovation Solution
The implementation of directional loudspeaker arrays with optimized configurations and signal processing techniques, including the use of multiple acoustic energy sources and microprocessor-driven digital signal processing, to achieve desired radiation patterns and minimize interference between seating positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional loudspeaker systems are used in vehicles, then audio can be played for multiple listeners, but audio signals interfere with each other and audio quality deteriorates due to lack of directional control
Solution Approach 1:
The loudspeaker system is divided into multiple independent loudspeaker elements arranged in arrays, with each element capable of being controlled independently to direct audio signals to specific seating positions, thereby segmenting the audio space and reducing interference between listeners
Solution Approach 2:
The system dynamically adjusts the radiation patterns of loudspeaker elements based on detected seating positions and audio selections of individual listeners, allowing real-time optimization of audio delivery to minimize interference and maintain high audio quality for multiple users
2Reliability
If directional loudspeaker arrays with multiple elements are implemented, then audio isolation between seating positions is improved, but device complexity increases
Solution Approach 1:
The system incorporates sensors that detect the actual seating positions of listeners and feeds this information back to the control system, which then adjusts the loudspeaker element activation and signal parameters accordingly, enabling adaptive audio isolation without requiring manual configuration
Solution Approach 2:
The system automatically determines optimal loudspeaker element configurations based on detected seating positions and listener preferences, eliminating the need for manual setup or complex user configuration while achieving effective audio isolation between seating positions
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 enhances audio isolation between seating positions, ensuring that each listener receives their intended audio source with reduced interference, improving overall audio quality and allowing multiple listeners to enjoy different audio content without disturbance.
Implementation Method 1
over a range of frequencies in which the wavelengths of the radiated acoustic energy are large relative to the spacing of the energy sources with respect to each other, the pressure waves radiated by the acoustic energy sources destructively interfere
Implementation Method 2
radiating acoustic energy corresponding to the audio signals in a desired direction
Data Source
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Figure 2B
AI summary
An audio system for a vehicle has at least one source of audio signals. A respective directional loudspeaker array is mounted at each seat position and coupled to the at least one source. The at least one source includes a microphone that detects speech from an occupant of the first seat position. Processing circuitry receives signals from the microphone that correspond to the detect speech and drives each second respective loudspeaker array at the other seat positions to radiate acoustic energy corresponding to the detected speech. The processing circuitry processes magnitude and phase of the signals from the microphone to each second directional loudspeaker array so that each second directional loudspeaker array directionally radiates first acoustic energy to the seat position at which the second directional loudspeaker array is located and so that second acoustic energy radiated from the second directional array to the first seat position is less than the first acoustic energy according to a predetermined criteria.