Vehicle Sound Generator Using Cyclic Waveforms for Real-Time Audio

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Solution Overview

Problem

Existing active sound effect generators for vehicles require significant computational resources, making real-time sound generation challenging, and user adjustment of sound effects is complex.

Innovation Solution

An active driving sound effect generator using a cyclic waveform table with continuous endpoints and multiple frequency components, reducing computational load and enabling easy tone adjustment through a waveform generator and speaker system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If complex calculation methods are used to generate realistic driving sound effects, then sound realism is improved, but processing load increases and real-time generation becomes difficult

Engineering Contradiction:

Improvesound realismVSAvoidreal-time generation capability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent pre-calculates and stores waveform data for multiple frequency components in waveform data tables before operation. During real-time sound generation, the system simply retrieves and combines these pre-prepared waveforms based on current vehicle conditions, avoiding complex real-time calculations while maintaining sound realism.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent divides the sound generation into multiple independent frequency components (first, second, third frequency components corresponding to fundamental, second harmonic, and third harmonic frequencies). Each component is stored separately in waveform data tables and can be independently retrieved and combined, simplifying real-time processing while preserving realistic sound characteristics.

Inventive Principle:

Principle #1Segmentation

2Reliability

If multiple ordered acoustic signals are generated and combined, then sound effect quality is improved, but calculation amount increases

Engineering Contradiction:

Improvesound effect qualityVSAvoidcalculation amount

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent uses pre-recorded waveform data that copies actual engine sound characteristics across different frequency ranges. Instead of calculating acoustic signals from physical models, the system retrieves copied waveform patterns from tables and scales them according to vehicle speed and load, significantly reducing calculation requirements while maintaining high sound quality.

Inventive Principle:

Principle #26Copying

3Adaptability or versatility

If detailed tone adjustment options are provided, then sound customization capability is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvetone adjustment capabilityVSAvoiduser adjustment difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent provides multiple preset sound modes (first, second, third sound modes) that offer different tone characteristics. Users can switch between these pre-configured modes without needing to manually adjust individual frequency parameters, making the system both versatile in sound options and easy to operate through simple mode selection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250259612A1Active driving sound effect generator

Publication Date: 2025.08.14 HONDA MOTOR CO LTD

AI summary

An active driving sound effect generator is an active driving sound effect generator mounted on a vehicle and includes a waveform generator configured to generate a signal from a waveform table depending on vehicle information, and a speaker configured to output the signal generated by the waveform generator. The waveform table is a cyclic waveform table in which an end point and a start point of the waveform table are continuous and contains multiple frequency components.