An engineering blog for engineers working in Audiovisuals, Telecommunications, Electronics, ICT, Computer Engineering, Multimedia and Telematics.

08 October 2010 | Posted by Redacción Ingeniería

CTMedia in the EAA-EUROREGIO 2010

The CTMedia La Salle participated in the EAA-EUROREGIO 2010, held in Ljubljana (Slovenia), on the 15-18 September 2010. The EAA-EUROREGIO is an international congress on sound and vibration promoted by the European Acoustics Asociation (EAA). A special feature of this EAA EUROREGIO  was the integration of the summer school entitled "First Forum of Young Researchers in Acoustics”, which was held prior to the congress, from 13 to 15 September 2010. Lectures  were given by internationally distinguished professors and experts on acoustics, and dealt with topics such as soundscapes, building acoustics, numerical methods or ultrasounds.

The PhD student Xavier Valero, granted by the EAA and COST (European Cooperation in Science and Technology), presented the paper “Applicability of MPEG-7 low level descriptors to environmental sound source recognition”, authored together with Dr.Francesc Alías.

Abstract:

MPEG-7 part 4 standard was originally developed to standardise audio description in multimedia contents. For that purpose and among others, Low Level Descriptors (LLD), which describe the signal by considering their temporal, spectral and timbre properties, were defined. In the current paper their applicability to environmental sounds description for recognition purpose is analysed. In order to come up with not only theoretical but empirical results, an automatic recognition system was built, composed of a self LLD implementation (based on the description of MPEG-7 standard) and an instance-based classifier using the K-Nearest Neighbours algorithm. Tests were conducted using samples extracted from both common sound libraries and self recordings. On one hand, the effectiveness of applying each LLD to the considered environmental sounds is analyzed. On the other hand, LLD as a whole set is compared to other state-of-the-art environmental sound descriptors.

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