Analysis of auditory scene relies on the appropriate division of the sensory input into meaningful events. The auditory system uses a sequential grouping strategy to segregate different acoustic events in the time domain. As a result of grouping, the organization of sound is expected to include acoustic events spanning different scales of time. It is unclear, however, at which moment the centra...

A computer model is described that uses simple physiological principles that operate mainly at a peripheral level to account for perceptual coherence among successive pure tones of changing frequency. Using a single set of parameter values, the model is able to reproduce a number of fundamental auditory streaming phenomena. These include the build-up of auditory stream segregation over time, an...

For speech segregation, a recurrent blind separation model (BSS) is tested together with a Computational Auditory Scene Analysis (CASA) model, which is based on the localisation cue and the evaluation of the Time Delay Of Arrival (TDOA). The test database is composed of 332 binary mixture sentences recorded in stereo with a static set-up. These are truncated at 1 second for the simulations. For...

We investigate the packet delay and loss characteristics of the wide-area HIPPI-based CASA gigabit testbed. Developed for high{speed local area device interconnects, HIPPI is a point{to{point, connection{oriented protocol. We show HIPPI blocking can degrade performance by increasing delay and/or packet loss. In the CASA network under conditions of blocking, a tradeoo exists between packet loss ...

The energy spectrum and primary composition of cosmic rays with energy between 3 × 1014 and 3 × 1016 eV have been studied using the CASA-BLANCA detector. CASA consisted of 957 surface scintillation stations; BLANCA consisted of 144 angle-integrating Cherenkov light detectors located at the same site. CASA measured the charged particle distribution of air showers, while BLANCA measured the later...

A sound classification system for the automatic recognition of the acoustic environment in a hearing instrument is discussed. The system distinguishes the four sound classes ‘clean speech’, ‘speech in noise’, ‘noise’, and ‘music’ and is based on auditory features and hidden Markov models. The employed features describe level fluctuations, the spectral form and harmonicity. Sounds from a large d...

Humans and other animals can attend to one of multiple sounds and follow it selectively over time. The neural underpinnings of this perceptual feat remain mysterious. Some studies have concluded that sounds are heard as separate streams when they activate well-separated populations of central auditory neurons, and that this process is largely pre-attentive. Here, we argue instead that stream fo...

Auditory scene analysis begins in infancy, making it possible for the baby to distinguish its mother's voice from other noises in the environment. Despite the importance of this process for human behavior, the question of how perceptual sound organization develops during childhood is not well understood. The current study investigated the role of attention for perceiving sound streams in a grou...

Auditory scene analysis (ASA) refers to the process (es) of parsing the complex acoustic input into auditory perceptual objects representing either physical sources or temporal sound patterns, such as melodies, which contributed to the sound waves reaching the ears. A number of new computational models accounting for some of the perceptual phenomena of ASA have been published recently. Here we ...

In this review paper aimed at the non-specialist, we explore the use that neuroscientists and musicians have made of perceptual illusions based on ambiguity. The pivotal issue is auditory scene analysis (ASA), or what enables us to make sense of complex acoustic mixtures in order to follow, for instance, a single melody in the midst of an orchestra. In general, ASA uncovers the most likely phys...