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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
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Sample-based engine noise synthesis using an enhanced pitch-synchronous overlap-and-add method.

Jan Jagla1, Julien Maillard, Nadine Martin

  • 1Centre Scientifique et Technique du Bâtiment, Paris-Est University, 24 rue Joseph Fourier, 38400 Saint Martin d'Hères, France. jan.jagla@cstb

The Journal of the Acoustical Society of America
|November 14, 2012
PubMed
Summary
This summary is machine-generated.

This study presents a novel algorithm for real-time internal combustion engine noise synthesis. The method enables realistic audio generation for varying engine speeds, offering a computationally efficient solution for applications requiring dynamic engine sound simulation.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Automotive Engineering

Background:

  • Accurate synthesis of internal combustion engine noise is crucial for applications like vehicle simulation and diagnostics.
  • Existing methods may struggle with real-time performance or accurately capturing the nuances of varying engine speeds.

Purpose of the Study:

  • To develop a real-time algorithm for synthesizing internal combustion engine noise.
  • To enable the generation of engine noise corresponding to arbitrary engine speed variations.

Main Methods:

  • Analysis of recorded engine noise across the full speed range to extract a dataset of sound samples.
  • Utilizing a modified PSOLA (Pitch Synchronous Overlap Add) method, adapted for engine noise periodicity.
  • Concatenating extracted sound samples using an overlap-add algorithm for synthesis.

Main Results:

  • Successful extraction of sound samples representing engine cycles with appropriate overlap.
  • Demonstration of high-quality audio restitution for synthesized engine noise.
  • Achieved low computational load, suitable for real-time applications.

Conclusions:

  • The proposed algorithm effectively synthesizes realistic internal combustion engine noise in real-time.
  • The method's efficiency and quality make it suitable for various simulation and interactive applications.
  • This approach offers a significant advancement in the field of real-time acoustic simulation for engines.