Acoustic Simulation Apparatus for Vehicle Stereophonic Sound
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies are inadequate for precisely simulating stereophonic sound in vehicle compartments, which is essential for accurate evaluation.
Innovation Solution
An acoustic simulation apparatus that generates virtual reproduction signals based on sound pickup signals from ambisonic microphones, simulating virtual speakers at multiple positions within the vehicle, and adjusts these signals to reflect changes in acoustic characteristics, allowing for precise prediction and output of stereophonic sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sound simulation technology is used in vehicle compartments, then basic sound prediction is possible, but stereophonic sound simulation precision is insufficient
Solution Approach 1:
The patent creates virtual copies of the acoustic environment by generating virtual reproduction signals that simulate how sound would be reproduced at multiple speaker positions within the vehicle compartment. This virtual modeling approach allows precise stereophonic sound simulation without requiring physical measurement equipment at each position, thereby improving measurement precision while avoiding the complexity of deploying multiple physical measurement systems.
Solution Approach 2:
The patent introduces an intermediary processing system that transforms measured sound signals into virtual reproduction signals through mathematical modeling and signal processing. This intermediary layer (the virtual prediction signal generation unit) mediates between physical measurements and stereophonic sound evaluation, enabling precise simulation without directly complexifying the physical measurement setup.
2Measurement precision
If virtual speakers at multiple positions are simulated, then stereophonic sound evaluation is improved, but signal processing complexity increases
Solution Approach 1:
The patent segments the sound simulation task by processing signals for each virtual speaker position separately through dedicated conversion units. Each unit handles the transformation from measured signals to virtual reproduction signals for specific speaker positions, breaking down the complex multi-position simulation into manageable segments that can be processed independently and then combined.
Solution Approach 2:
The patent performs preliminary signal processing by pre-calculating virtual reproduction signals for multiple speaker positions before final stereophonic sound evaluation. The virtual prediction signals are generated in advance based on measured data, allowing the system to prepare all necessary virtual speaker outputs beforehand, which simplifies the final evaluation process.
Data Source
AI summary
A virtual reproduction signal generation unit generates a virtual reproduction signal based on a sound pickup signal of a stereophonic sound at a listening position in a compartment, assuming that virtual speakers are respectively located at portions of Np positions in a vehicle, the virtual reproduction signal causing the virtual speakers of the Np positions to reproduce the stereophonic sound. A virtual prediction signal generation unit generates a virtual prediction signal based on the virtual reproduction signal and an information representing a change of acoustic characteristics when at least part of the portions of the Np positions is changed, the virtual prediction signal causing the virtual speakers of the Np positions to output a predicted sound at the listening position. An output signal generation unit generates an output signal based on the virtual prediction signal, the output signal causing speakers of a plurality of positions to output the predicted sound.