The use of high bandwidth pulses in active sonar systems can reduce interference from reverberation and variability due to channel fading. However, the matched filter detection performance is degraded more by acoustic multipath when the bandwidth is increased. The performance degradation due to multipath distortion results when the destructive interference of the paths cancels some frequencies ...

Neutrino astronomy was initiated primarily to search for TeV to PeV neutrinos from Active Galactic Nuclei, and the optical Cherenkov technique is well suited for this energy range. Interest has grown recently in detecting EeV neutrinos, particularly the “cosmogenic” neutrinos produced during propagation of ultra-high-energy cosmic rays (UHECR) through the microwave background radiation. These n...

What we believe to be a novel multipass, acoustically open photoacoustic detector designed for fast-response, high-sensitivity detection of trace gases and pollutants in the atmosphere is demonstrated. The acoustic pulses generated by the absorption of the light pulses of a tunable optical parametric oscillator by target molecules are detected by an ultrasonic sensor at 40 kHz. The photoacousti...

A literature review concerning perception of coloration is presented. In the paper we also present a review of general psycho acoustic background material concerning auditory modeling including perception of timbre and amplitude modulation. Furthermore, some classical room acoustic measures for echo perception are considered. Finally, some of the simple engineering measures to rate coloration i...

Humans can easily segregate and recognize one sound source from an acoustic mixture, and recognize a certain voice from a busy background which includes other people talking and music. Sound event detection and classification aims to process an acoustic signal and convert it into descriptions of the corresponding sound events present at the scene. This is useful, e.g., for automatic tagging in ...

Seeing the facial gestures of a speaker enhances phonemic identification in noise. The goal of this study was to assess whether the visual information regarding consonant articulation activates lexical representations. We conducted a phoneme monitoring task with word and pseudo-words in audio only (A) and audiovisual (AV) contexts with two levels of white noise masking the acoustic signal. The ...

In this contribution, an acoustic event detection system based on spectro-temporal features and a two-layer hidden Markov model as back-end is proposed within the framework of the IEEE AASP challenge ‘Detection and Classification of Acoustic Scenes and Events’ (D-CASE). Noise reduction based on the log-spectral amplitude estimator by [1] and noise power density estimation by [2] is used for sig...