Sound Event Detection is a task with rising relevance over the recent years in field of audio signal processing, due to creation specific datasets such as Google AudioSet or DESED (Domestic Environment Detection) and introduction competitive evaluations like DCASE Challenge (Detection Classification Acoustic Scenes Events). The different categories acoustic events can present diverse temporal s...

In ultrasound images, acoustic shadows appear as regions of low signal intensity linked to boundaries with very high acoustic impedance differences. Acoustic shadows can be viewed either as informative features to detect lesions or calcifications, or as damageable artifacts for image processing tasks such as segmentation, registration or 3D reconstruction. In both cases, the detection of these ...

This paper presents an innovative rapid adaptation technique for tracking highly non-stationary acoustic noises. The novelty of this technique is that it can detect the acoustic change points from the spectral characteristics of the observed speech signal in rapidly changing non-stationary acoustic environments. The proposed innovative noise tracking technique will be very suitable for joint ad...

This paper presents an algorithm which works with oesophageal voices in order to evaluate their quality by means of the automatic calculation of shimmer. The evaluation requires a novel and specific processing for the detection of the periodicity cycles and instants in order to calculate amplitude perturbations of vocal signals. The designed algorithm performs the calculus in an automatic way w...

The application of low probability detection (LPD) in underwater acoustic communication is challenging due to the limited bandwidth and frequency band available that allows simple interception using energy detection. Confronting that, recent LPD schemes offer disguise signal as a vocalization marine mammal. This way, signals can be transmitted at high power, while interceptor believes these are...

Increase in the number of older people due to demographic changes poses great challenges to the social healthcare systems both in the Western and as well as in the Eastern countries. Support for older people by formal care givers leads to enormous temporal and personal efforts. Therefore, one of the most important goals is to increase the efficiency and effectiveness of today’s care. This can b...

Abstract Line spectrum detection is an important research direction in the field of underwater acoustic target detection. The relevant features can be obtained by using line signal power spectrogram, but radiated noise susceptible to influence external noise, which degrades quality and thus affects complete extraction spectrum. A denoising method proposed this paper based on deep learning netwo...

A new optical pump-probe technique is implemented for the investigation of coherent acoustic phonon dynamics in the GHz to THz frequency range which is based on two asynchronously linked femtosecond lasers. Asynchronous optical sampling (ASOPS) provides the performance of on all-optical oscilloscope and allows us to record optically induced lattice dynamics over nanosecond times with femtosecon...

In situ acoustic calibration devices are necessary to assure the optimal performance of sensors and detectors for the acoustic detection of ultra-high energy neutrinos in underwater telescopes. Moreover, they provide evidences for the feasibility evaluation of the technique and for the determination of the entire detector efficiency. Following previous studies related to parametric acoustic sou...