Engine Harmonic Sound Stage Control Across RPM and Load
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Solution Overview
Problem
Current engine harmonic enhancement (EHE) technologies fail to dynamically control the sound stage width and location in response to varying engine RPM and load, limiting the ability to effectively mask or complement engine sounds.
Innovation Solution
The method involves generating harmonic enhancement signals with phase and gain differences between left and right channels, and front and rear channels, which are adjusted based on engine RPM and load, allowing for a dynamic sound stage control by introducing per-harmonic phase and gain variations to simulate a changing acoustic image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional EHE technologies are used, then engine harmonic enhancement is provided, but the sound stage width and location cannot be dynamically controlled
Solution Approach 1:
The patent applies dynamics by making the sound stage position and width adjustable and changeable in real-time based on engine operating conditions. The system dynamically modifies the phase and magnitude of harmonic signals to move the sound stage between front and rear positions and adjust its width, transforming a static EHE system into an adaptive one that responds to varying engine RPM and load conditions.
Solution Approach 2:
The patent implements parameter changes by systematically varying the phase and magnitude parameters of harmonic signals. By changing the phase difference between left and right channel signals and adjusting the magnitude distribution across frequency bands, the system controls the perceived sound stage position and width, enabling dynamic adaptation without hardware modifications.
2Adaptability or versatility
If per-harmonic phase and gain variations are introduced, then dynamic sound stage control is achieved, but the signal processing complexity increases
Solution Approach 1:
The patent applies segmentation by processing each harmonic component independently with its own phase and magnitude adjustments. The sound enhancement signal is divided into multiple frequency bands corresponding to different harmonics, allowing individual control of each band's characteristics to create the dynamic sound stage effect while maintaining systematic organization.
Solution Approach 2:
The system dynamically adjusts phase and magnitude parameters for each harmonic based on real-time engine operating conditions. The phase difference between channels and the magnitude distribution are continuously modified as engine RPM and load change, enabling the sound stage to move and resize dynamically without requiring complex manual intervention.
3Object-affected harmful factors
If the sound stage is positioned dynamically, then the engine sound masking effectiveness is improved, but the system complexity increases
Solution Approach 1:
The patent changes the phase and magnitude parameters of harmonic signals to dynamically position the sound stage. By adjusting the phase difference between left and right channels and modifying the magnitude distribution across frequencies, the system effectively masks engine noise at different operating conditions without requiring physical isolation or additional noise control hardware.
Data Source
AI summary
A method to produce a dynamic sound stage for engine harmonic enhancement (EHE). Dynamic refers to the ability to position the sound stage at different positions as the engine operates at various RPMs and load. In order to control the sound stage width, a phase difference can be introduced between a first audio channel (e.g., a left audio channel) and second audio channel (e.g., a right audio channel). In the most general case, the phase difference can be introduced per harmonic per RPM. In this approach, the phase difference can be adjusted such that a vehicle occupant will perceive each harmonic signal to have a particular width. This width can be adjusted independently per RPM regions by tuning the per harmonic phase difference.