A perceptually evaluated signal model: Collisions between a vibrating object and an obstacle

Samuel Poirot, Stefan Bilbao, Solvi Ystad, Mitsuko Aramaki, Richard Kronland Martinet

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The collision interaction mechanism between a vibrating string and a non-resonant obstacle is at the heart of many musical instruments. This paper focuses on the identification of perceptually salient auditory features related to this phenomenon. The objective is to design a signal-based synthesis process, with an eye towards developing intuitive control strategies. To this end, a database of synthesized sounds is assembled through physics-based emulation of a string/obstacle collision, in order to characterize the effect of collisions on time-frequency content. The investigation of this database reveals characteristic time-frequency patterns related to the position of the obstacle during the interaction. In particular, a frequency shift of certain modes is apparent for strong interactions, which, alongside the generation of new frequency components, leads to increased perceived roughness and inharmonicity. These observations enable the design of a real-time compatible signal-based sound synthesis process, with a mapping of synthesis parameters linked to the perceived location of the obstacle. The accuracy of the signal model with respect to the physical model sound output and recorded sounds was evaluated through listening tests: time-frequency patterns reproduced by the signal model enabled listeners to precisely recognize the transverse location of the obstacle.
Original languageEnglish
Pages (from-to)2338-2350
Number of pages13
JournalIEEE/ACM Transactions on Audio, Speech and Language Processing
Volume31
DOIs
Publication statusPublished - 12 Jun 2023

Keywords / Materials (for Non-textual outputs)

  • signal synthesis
  • signal design
  • acoustic signal processing

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