For speech segregation, a blind separation model (BSS) is tested together with a 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 applying the two models, we cut the frequency doma...

This case describes the implementation and subsequent failure of an innovative system installed in the bars of Alvalade XXI, the recently built football stadium in Lisbon, Portugal. Casa XXI, the company running the bars, had entrusted the project to an IT supplier who had limited experience with large systems. During the inauguration, the system failed spectacularly creating a chaotic situatio...

Online tracking of speakers is an important task for applications in smart environments such as camera control, meeting annotation and speech separation. Challenges for an audio-only system are small-room reverberation, noise, the unknown number of speakers, and gaps occurring in natural speech. Combining models from neurobiology and cognitive psychology with many-channel signal processing and ...

For speech segregation, a recurrent blind separation model (BSS) is tested together with a 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 applying the two models, we cut the fre...

We propose and test a cocktail-party recognition technique based on segregation applied before recognition. This CASA front-end uses the TDOA (Time Delay Of Arrival) evaluated within subbands in order to determine the Relative Level (RL) of two competing speech sources. To perform the evaluation of the model, we have recorded a stereo database ST-NB95 from the mono Numbers95. This is composed o...

CASA is the technique used to segregate a target speech from a monaural mixture. This article proposes a technique to separate the sinusoidal noise from monaural mixtures. Many sounds are there that are important to humans are having pseudo-periodic structure over a particular period /stretch of time. Where this fixed period is typically range of 100Hz-5KHz which gives the corresponding pitch p...

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...