Engine Sound Control Device Interpolation Method
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Solution Overview
Problem
Existing techniques for generating pseudo engine sounds in automobiles require significant time and effort to acquire and set sound source data and effects for various driving states, leading to either excessive data requirements or degraded sound quality when reducing the number of data points.
Innovation Solution
An engine sound control device and method that uses user-set point information and driving scene region settings to interpolate spectral information across a driving state space, generating an engine sound setting map and outputting control sounds based on this data to reduce user effort and improve sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sound source data is acquired for a large number of driving states, then the quality of pseudo engine sound is improved, but the time and effort required for data acquisition increases significantly
Solution Approach 1:
The system pre-acquires and stores engine sound data only at representative driving state points (center points of divided regions) before actual use. This preliminary action at key positions allows the system to generate pseudo engine sounds for any driving state through interpolation, eliminating the need to acquire data for all possible driving states while maintaining sound quality.
2Loss of time
If the number of sound source data points is reduced, then the data acquisition effort is decreased, but the pseudo engine sound quality degrades due to discrete changes
Solution Approach 1:
The system introduces an interpolation mechanism as an intermediary between the sparsely acquired sound source data at representative points and the required sound data for any arbitrary driving state. This intermediary process generates continuous, smooth transitions between discrete data points, preventing discrete changes in sound quality while requiring minimal original data.
3Manufacturing precision
If effects settings are performed exhaustively for many driving states, then more natural pseudo engine sound is achieved, but the time and effort for setting increases
Solution Approach 1:
The system creates a universal engine sound setting map that can be applied across all driving states through interpolation. Instead of performing exhaustive settings for each individual driving state, a single representative setting at each region center serves multiple purposes, and the interpolation mechanism extends this universality to cover the entire driving state space, significantly reducing setting effort while maintaining naturalness.
4Device complexity
If fewer sound source data points are used, then the system complexity is reduced, but the pseudo engine sound changes discretely
Solution Approach 1:
The system implements dynamic interpolation that continuously adapts to any driving state by calculating weighted combinations of nearby representative points. This dynamic approach ensures smooth, continuous sound transitions as driving conditions change, preventing discrete jumps in sound quality while keeping the underlying data structure simple and manageable.
Data Source
AI summary
An engine sound control device includes: a setter to set point information including coordinates indicating one of multiple cells of a driving state space represented by a coordinate system with parameters indicating a driving state as axes, and spectral information of a target engine sound at the cell; a setter to set region information indicating a driving scene region; a processor to perform an interpolation process to calculate spectral information of an engine sound for each of target cells of the multiple cells for which the point information is not set, based on the point information and region information, and generate a map including spectral information of an engine sound at each cell, from the point information and information obtained by the process; a processor to output a control parameter based on the map; and a controller to cause a unit to output a sound based on the control parameter.