Sample-based engine noise synthesis using an enhanced pitch-synchronous overlap-and-add method

Jan Jagla (1, 1, 2) , Julien Maillard (1, 1) , Nadine Martin (3)

1 CSTB - Centre Scientifique et Technique du Bâtiment
2 GIPSA-lab - Grenoble Images Parole Signal Automatique
3 GIPSA-SAIGA - GIPSA - Signal et Automatique pour la surveillance, le diagnostic et la biomécanique

An algorithm for the real time synthesis of internal combustion engine noise is presented. Through the analysis of a recorded engine noise signal of continuously varying engine speed, a dataset of sound samples is extracted allowing the real time synthesis of the noise induced by arbitrary evolutions of engine speed. The sound samples are extracted from a recording spanning the entire engine speed range. Each sample is delimitated such as to contain the sound emitted during one cycle of the engine plus the necessary overlap to ensure smooth transitions during the synthesis. The proposed approach, an extension of the PSOLA method introduced for speech processing, takes advantage of the speci c periodicity of engine noise signals to locate the extraction instants of the sound samples. During the synthesis stage, the sound samples corresponding to the target engine speed evolution are concatenated with an overlap and add algorithm. It is shown that this method produces high quality audio restitution with a low computational load. It is therefore well suited for real time applications.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Jan Jagla, Julien Maillard, Nadine Martin. Sample-based engine noise synthesis using an enhanced pitch-synchronous overlap-and-add method. Journal of the Acoustical Society of America, 2012, 132 (5), pp.3098-3108. ⟨10.1121/1.4754663⟩. ⟨hal-00730614⟩