A set of features extracted from audio sources is investigated for content-based classification of musical instrument timbres. The adopted features describe spectral characteristics of monophonic sounds and rely on the previous segmentation of the signal and the estimation of pitch. The dataset is composed by 1007 tones from 27 musical instruments ranging from orchestral sounds (strings, woodwi...

An experimental study of strings, woodwind (organ pipe, flute, clarinet, saxophone and recorder) and the voice was undertaken to illustrate the basic principles of sound production in musical instruments. The setup used is simple and consists of common laboratory equipment. The canonical examples (standing wave on a string, in an open and closed pipe) are easily reproduced. The characteristics ...

Background: The extensive education on contraceptive methods, particularly in rural areas of developing countries, play a pivotal role in preventing of induced abortion. The main purpose of this study was to determine the prevalence and major cause of induced abortion in women in northwestern Iran. Materials and Methods: The hospital documentary of 848 women encountering medical examinations du...

In order to assess higher auditory processing capabilities, long-latency auditory evoked potentials (AEPs) were recorded to synthesized musical instrument tones in 22 post-comatose patients with severe brain injury causing variably attenuated behavioural responsiveness. On the basis of normative studies, three different types of spectro-temporal modulation were employed. When a continuous 'clar...

The understanding of the relationship between excitation parameters and oscillation regimes is a classical topic concerning bowed string instruments. For reed instruments, results are less numerous. Nevertheless it is interesting to know the range of parameters for which sound can be produced or not, and if the emergence and extinction bifurcations are direct or not, with consequences on the pi...

Acoustic events often have a visual counterpart. Knowledge of visual information can aid the understanding of complex auditory scenes, even when only a stereo mixdown is available in the audio domain, e.g., identifying which musicians are playing in large musical ensembles. In this paper, we consider a vision-based approach to note onset detection. As a case study we focus on challenging, real-...