Citation Context

...or further processing. We briefly review the generic ICA-based BSS framework for convolutive mixtures called TRINICON [3,4], which is also capable of simultaneously localizing multiple active sources =-=[5,6]-=-. The motivation for considering it here is that most of the known state-of-the-art BSS algorithms may be seen as certain approximations of this concept. As a fairly recent and advanced approximate pr...

Citation Context

...technique proposed in [8]. We define a global pause detection function that can be computed in real-time. When a pause occurs, a pause detection index is computed for each microphone pair. The a-priori information about the activity of the sources can be efficiently exploited to solve the aforementioned ambiguity problem. In fact, when one of the sources is in silence, the TDOAs corresponding to the other source are correctly identified and a label is assigned to each TDOA which informs us about the source it refers to. Recently, 1 a novel approach to solve the ambiguity problem was presented [1], based on the maximization of cross-correlation between the outputs of the de-mixing filters at different microphone pairs. Though effective, this method cannot be applied in presence of pauses and it relies on the fact that the sources can be effectively separated. The tracking algorithm described in [2] is based on a state-space formulation and uses a particle filtering approach. Recently the particle filtering (PF) algorithms have gained a great deal of attention as they provide a solution for the problem of state estimation in the nonlinear, multimodal and non-Gaussian case. For the probl...

Citation Context

...problem of TDOA-based localization for a single (multiple) source(s) has been investigated from different perThis work was supported by NWO-STW under the VICI program (10382). spectives in literature =-=[11, 12, 13, 14, 15, 16, 17, 18]-=-. In the speech and acoustic domain, some of these studies consider disjoint sources such as [12] and in many others linear array receivers are assumed and thus the problem basically boils down to dir...

Citation Context

...s all but one source direction. Although it does not entirely hold under realistic conditions, this interpretation gives some useful insights into the self-steering capability of BSS techniques [34], =-=[35]-=-. Actually, while accurate source location information is usually necessary to steer a beamformer, BSS offers the possibility to recover the original source signals from a (possibly reverberant) sound...

Citation Context

.... It has to be noted that in real applications, this can be any fractional delay. If a-priori information about the target angular position is missing, the localization concept as discussed, e.g., in =-=[10, 11]-=- can be applied. Owing to the property of BSS to produce independent output signals, directional BSS also suppresses correlated components arriving from other directions, i.e., reflections and reverbe...

Citation Context

...ion, the top-down, i.e., deductive approach of the TRINICON framework also allows us to present both relations to already known and new efficient algorithms. Section 4.2 follows the ideas outlined in =-=[5,6]-=-. Some of these ideas were also developed independently in [7] in a slightly different way. An important and particularly illustrative application of broadband MIMO BSI considered in the second part o...

Citation Context

...ch would permit not only to locate but also to separate the various signals at the same time. This problem is still difficult and open to research. A preliminary test of such a method can be found in =-=[13]-=-. 3. Microphone channel: recently, it was proposed to use several directional microphones placed at the same location, but oriented towards different directions [60]. The direction-dependent transfer ...