Audio Phase Modulation for Vehicle Simulator Interference
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Solution Overview
Problem
In vehicle simulators, variations in microphone position cause spatial interference fluctuations in sound signals, leading to amplitude changes that can exceed tolerance ranges, potentially resulting in simulator qualification issues, increased costs, and incorrect problem-solving efforts.
Innovation Solution
The method involves emitting two audio signals with the same frequency from distinct locations within the environment, where the phase difference between the signals varies over time to minimize time-averaged interference fluctuations, using a controller to manage the phase modulation of the audio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple audio signals are emitted from distinct locations to improve sound coverage, then spatial interference fluctuations increase, but sound quality consistency deteriorates
Solution Approach 1:
The patent applies dynamics by making the phase difference between audio signals time-varying rather than static. The controller continuously adjusts the phase difference between signals from distinct emitters, transforming the system from a fixed configuration to a dynamic one that adapts to minimize spatial interference fluctuations and maintain consistent sound quality across the coverage area.
Solution Approach 2:
The patent changes the phase parameter of the audio signals over time. By varying the phase difference between signals from different emitters as a function of time, the system modifies the interference pattern dynamically, preventing the formation of persistent spatial interference zones and ensuring uniform sound distribution across the environment.
2Adaptability or versatility
If microphone position varies during testing, then spatial interference patterns change, but measurement precision deteriorates
Solution Approach 1:
The patent implements feedback by using a microphone to detect the actual sound field created by multiple emitters, then using this detection information to adjust the phase difference of the emitted signals. This closed-loop control ensures that regardless of microphone position variations, the system adapts to maintain consistent measurements within the tolerance range.
Solution Approach 2:
The system dynamically adjusts the phase difference based on real-time conditions, making the sound field adaptable to microphone position changes. This dynamic adjustment ensures that measurement precision is maintained even when the microphone is positioned at different locations during testing.
3Device complexity
If phase difference is kept constant to simplify control, then device complexity decreases, but spatial interference fluctuations increase
Solution Approach 1:
The patent applies periodic action by varying the phase difference between audio signals in a systematic time-varying manner. This periodic modulation of the phase parameter creates a time-varying interference pattern that averages out spatial fluctuations, achieving stable sound distribution without requiring complex real-time adaptive control systems.
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 approach effectively limits spatial interference fluctuations, ensuring consistent sound quality within the simulator environment, thereby meeting regulatory standards and reducing costs associated with repeated testing.
Implementation Method 1
the first audio signal and second audio signal have a phase difference that varies as a function of time to limit the time-averaged interference fluctuation across the environment
Implementation Method 2
limit the time-averaged interference fluctuation across the environment
Data Source
AI summary
A method for generating sound within a predetermined environment, the method comprising: emitting a first audio signal from a first location; and concurrently emitting a second audio signal from a second location, wherein: the first location and second location are distinct within the environment; the first audio signal and second audio signal have the same frequency; and the first audio signal and second audio signal have a phase difference that varies as a function of time to limit the time-averaged interference fluctuation across the environment.