In this paper, a new pseudo affine projection (AP) algorithm based on Gauss-Seidel (GS) iterations is proposed for acoustic echo cancellation (AEC). It is shown that the algorithm is robust against near-end signal variations (including double-talk). Keywords—pseudo affine projection algorithm, acoustic echo cancellation, double-talk.

Introduction – Echo Cancellation Echo cancellation is a signal processing technique for removing unwanted signals from speech and audio. The goal is to improve signal clarity. In speech transmission systems, such as telephone networks, echo cancellers are necessary to allow natural interactions between human speakers. The human hearing system (ear+brain) has a form of echo cancellation, which i...

We introduce a new device in the study of abstract elementary classes (AECs): Galois Morleyization, which consists in expanding the models of the class with a relation for every Galois (orbital) type of length less than a fixed cardinal κ. We show: Theorem 0.1 (The semantic-syntactic correspondence). An AEC K is fully (< κ)-tame and type short if and only if Galois types are syntactic in the Ga...

This paper gives a short review about echo cancellation techniques used in DSL systems and a short comparison between them. It should also give an overview about the basics and algorithms of echo cancellation and why it is used in Digital Subscriber Line systems.

We use iterations of elementary embeddings derived from countably complete ideals on ω1 to provide a uniform proof of some classical results connecting the number of models of cardinality א1 in various infinitary logics to the number of syntactic types over the empty set. We introduce the notion of an analytically presented abstract elementary class (AEC), which allows the formulation and proof...

Elementary Classes Motivations and Directions John T. Baldwin Why AEC? Categoricity and Complex Exponentiation Excellence– Generalized Amalgamation Eventual Categoricity Core Mathematics again Abstract Elementary Classes Motivations and Directions

With the development of technology the whole dimension of communication has changed. In modern day people are more interested in hand-free communication. So, the users use an ordinary loudspeaker and a microphone, at place of telephone receiver. Benefit of wireless communication is that it allows the users to have both hands free and to travel freely in the area. The truth of a huge audio mixtu...

In this paper, we propose improved versions of normalized least mean square (NLMS) algorithm: single and multiple -variable step size normalized least mean square (VSSNLMS) algorithms for echo cancellation. The presented algorithms exhibit faster convergence rate in comparison to NLMS algorithm. Simulation results employing standard figure of merits show how the algorithms perform better than N...

Absfracf-An approach to the implementation of asynchronous and timing jitter insensitive data echo cancellation is described. This approach introduces a small amount of jitter in the transmitted data signal, or alternatively in the received signal sampling, and uses a simple digital phase-locked loop together with the storage of two sets of echo canceler coefficients. The effect of derived timi...

Echo cancellation has been most widely studied for hands-free telephony and for cancelling line echos in telephone central o ces. The problem of echo cancelling in speech dialog systems is similar, however it has some speci c requirements. In this contribution, a subband echo cancellation structure is proposed which can be integrated in the feature extraction part of a recognizer. A NLMS gradie...