In this paper, we propose a novel residual echo suppression (RES) algorithm constructed in the acoustic echo canceller. In the proposed approach, we introduce a statistical model to detect the signal components of the output signal and the state of signal is classified into four distinct hypothesis depending on the activity of near-end signal and residual echo. For hypothesis testing, the conve...

Proportionate-type normalized suband adaptive filter (PNSAF-type) algorithms are very attractive choices for echo cancellation. To further obtain both fast convergence rate and low steady-state error, in this paper, a variable step size (VSS) version of the presented improved PNSAF (IPNSAF) algorithm is proposed by minimizing the square of the noise-free a posterior subband error signals. A non...

The characterization of the AEC domain through the employment of conceptual schemas and standards is challenged with significant problems for exchanging, sharing and integrating information between actors. Semantic gaps or lack of meaning definition at the conceptual and technical level, for example, are problems fundamentally originated through the employment of representations to map the ‘wor...

In a multidisciplinary design environment, such as the architecture, engineering and construction (AEC) domain, the various designers will have their own views, concepts and representations of design objects, making communication in a CAD environment a complex task. This paper demonstrates that by taking into consideration the concepts of function and purpose such multiple views and representat...

Definition 1.1. A class of τ -structures, (K,≺K), is said to be an abstract elementary class (AEC) if both K and the binary relation ≺K are closed under isomorphism and satisfy the following conditions. • A1. IfM ≺K N thenM ⊆ N . • A2. ≺K is a partial order on K. • A3. If 〈Ai : i < δ〉 is continuous ≺K -increasing chain: (1) ⋃ i<δ Ai ∈K; (2) for each j < δ, Aj ≺K ⋃ i<δ Ai (3) if each Ai ≺K M ∈K ...

This paper presents convergence characteristics of stereophonic echo cancellers with pre-processing. The convergence analysis of the averaged tap-weights show that the convergence characteristics depends on the relation between the impulse response in the far-end room and the changes of the pre-processing filters. Examining the uniqueness of the solution in the frequency domain leads us to the ...

This paper presents a low-complexity variable step-size control for acoustic echo cancellation filters. The proposed control method is based on two supplementary adaptive filters with low memory length. The first supplementary filter is used to control the double-talk situations while the second supplementary filter is employed to detect variations of the echo-path impulse response. The variabl...

We develop a notion of forking for Galois-types in the context of Abstract Elementary Classes (AECs). Under the hypotheses that an AEC K is tame, type-short, and failure of an order-property, we consider Definition 1. Let M0 ≺ N be models from K and A be a set. We say that the Galois-type of A over N does not fork over M0, written A^ M0 N , iff for all small a ∈ A and all small N− ≺ N , we have...

Absrrucr-A new form of adaptive balancing hybrid is proposed for application to the two-wire to four-wire interface of a local digital switch. i t is similar to an echo canceller but with a single degree of freedom and much simpler circuitry. In this paper a theory of operation of the hybrid is developed, and in a companion paper two circuit implementations and experimental results are re...

This paper reports on the first part of an ongoing research with the goal of designing a framework and a knowledge-based system for 3D parametric modelbased quantity take-off and cost estimation in the Architecture, Engineering and Construction (AEC) industry. The authors have studied and analyzed current cost estimation methods used in both the AEC and non-AEC industries in terms of their requ...