Real-Time Engine Sound Synthesis with Reduced Processing Load
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Solution Overview
Problem
Conventional methods for simulating engine sounds in driving simulators and games face challenges in processing sound pressure signals, leading to high processing loads and an inability to accurately match engine specifications, resulting in a lack of realism and real-time responsiveness.
Innovation Solution
A sound pressure signal output apparatus that acquires and synthesizes single sound data, order sound data, and random sound data to generate a realistic engine sound, with the ability to adjust for various engine specifications and processing loads, using a computer-based system that includes a database and processing unit to manage and output the sound signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound pressure signals are processed and synthesized under various conditions to match engine specifications, then the realism of the engine sound is improved, but the processing load on the apparatus increases
Solution Approach 1:
The patent segments the engine sound into three distinct components: single sound (combustion noise), order sound (periodic vibrations at rotation speed harmonics), and random sound (structure-borne noise). Each component is processed independently with dedicated synthesis methods, allowing complex realism requirements to be divided into manageable processing tasks that reduce overall computational load
Solution Approach 2:
The patent changes processing parameters based on engine operating conditions (rotation speed, accelerator opening, engine specifications). By dynamically adjusting which sound components are synthesized and at what detail level, the system maintains high realism when needed while reducing processing load during steady-state operations or when engine specs change
2Productivity
If sound pressure signals are synthesized in real-time to match engine state changes, then the responsiveness is improved, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary classification of engine sounds into distinct categories (single, order, random) that can be synthesized using predetermined algorithms. This pre-organization of sound synthesis approaches allows real-time processing by selecting and applying the appropriate synthesis method based on current engine state, rather than processing all sound components equally
Solution Approach 2:
The patent implements dynamic synthesis where the combination and processing intensity of different sound components adapts to real-time engine operating conditions. The system dynamically adjusts which sound components are active and their relative weights based on rotation speed, accelerator opening, and engine specifications, enabling responsive sound generation with optimized processing complexity
Data Source
AI summary
The present invention provides a sound pressure signal output apparatus capable of synthesizing and outputting a sound pressure signal that simulates the sound of a real engine with reduced processing load in real time while flexibly adapting to specification changes. The sound pressure signal output apparatus comprises: an interface that acquires single sound data corresponding to the sound generated by one cylinder of a vehicle-mounted internal combustion engine during one combustion cycle in the cylinder, acquires order sound data corresponding to order sound for a frequency corresponding to the engine rotation speed, and acquires random sound data generated corresponding to at least either the material or the shape of the structure that makes up an engine; and a synthesis unit that synthesizes and outputs the sound pressure signal of an engine sound using the single sound data and the like acquired.