Constantin Paleologu's Books

A Perspective on Stereophonic Acoustic Echo Cancellation

By: Jacob Benesty,Constantin Paleologu,Tomas Gänsler,Silviu Ciochină

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A Perspective on Stereophonic Acoustic Echo Cancellation

By: Jacob Benesty,Constantin Paleologu,Tomas Gänsler,Silviu Ciochină

Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression.

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Page Count

141

Publisher

Springer Science & Business Media

Published Date

ISBN 10

3642225748

ISBN 13

9783642225741

Sparse Adaptive Filters for Echo Cancellation

By: Constantin Paleologu,Jacob Benesty,Silviu Ciochina

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Sparse Adaptive Filters for Echo Cancellation

By: Constantin Paleologu,Jacob Benesty,Silviu Ciochina

Adaptive filters with a large number of coefficients are usually involved in both network and acoustic echo cancellation. Consequently, it is important to improve the convergence rate and tracking of the conventional algorithms used for these applications. This can be achieved by exploiting the sparseness character of the echo paths. Identification of sparse impulse responses was addressed mainly in the last decade with the development of the so-called ``proportionate''-type algorithms. The goal of this book is to present the most important sparse adaptive filters developed for echo cancellation. Besides a comprehensive review of the basic proportionate-type algorithms, we also present some of the latest developments in the field and propose some new solutions for further performance improvement, e.g., variable step-size versions and novel proportionate-type affine projection algorithms. An experimental study is also provided in order to compare many sparse adaptive filters in different echo cancellation scenarios. Table of Contents: Introduction / Sparseness Measures / Performance Measures / Wiener and Basic Adaptive Filters / Basic Proportionate-Type NLMS Adaptive Filters / The Exponentiated Gradient Algorithms / The Mu-Law PNLMS and Other PNLMS-Type Algorithms / Variable Step-Size PNLMS Algorithms / Proportionate Affine Projection Algorithms / Experimental Study

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Page Count

114

Publisher

Springer Nature

Published Date

ISBN 10

3031025598

ISBN 13

9783031025594

Liberalism, Constitutional Nationalism, and Minorities

The Making of Romanian Citizenship, c. 1750–1918

By: Constantin Iordachi

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Liberalism, Constitutional Nationalism, and Minorities

The Making of Romanian Citizenship, c. 1750–1918

By: Constantin Iordachi

Winner of the 2019 CEU Award for Outstanding Research This book documents the making of Romanian citizenship from 1750 to 1918 as a series of acts of national self-determination by the Romanians, as well as the emancipation of subordinated gender, social, and ethno-religious groups. It focuses on the progression of a sum of transnational “questions” that were at the heart of North-Atlantic, European, and local politics during the long nineteenth century, concerning the status of peasants, women, Greeks, Jews, Roma, Armenians, Muslims, and Dobrudjans. The analysis emphasizes the fusion between nationalism and liberalism, and the emancipatory impact national-liberalism had on the transition from the Old Regime to the modern order of the nation-state. While emphasizing liberalism's many achievements, the study critically scrutinizes the liberal doctrine of legal-political “capacity” and the dark side of nationalism, marked by tendencies toward exclusion. It highlights the challenges nascent liberal democracies face in the process of consolidation and the enduring appeal of illiberalism in periods of upheaval, represented mainly by nativism. The book's innovative interdisciplinary approach to citizenship in the Ottoman and post-Ottoman Balkans and the richness of the sources employed, appeal to a diverse readership.

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Page Count

704

Publisher

BRILL

Published Date

ISBN 10

9004401113

ISBN 13

9789004401112

Pray for Brother Alexander

By: Constantin Noica

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Pray for Brother Alexander

By: Constantin Noica

Constantin Noica's (1909-1987) Pray for Brother Alexander is a meditation on responsibility, freedom, and forgiveness. On the surface, the book describes events and people from Noica's life during his time in a political communist prison in Romania. However, the volume is not a historical account only, but rather an honest introspection into how a human being may keep sanity when everything around him makes no sense. Unlike his famous Romanian contemporaries, scholar Mircea Eliade, dramatist Eugen Ionescu, and philosopher Emil Cioran, who lived abroad, Constantin Noica did not leave communist Romania. Considered an "anti-revolutionary" thinker, Noica was placed under house arrest in Câmpulung-Muscel between 1949 and 1958. In 1958, he was sentenced to 25 years in prison. He was released after 6 years, and Pray for Brother Alexander covers his experiences during this time. In his writings, Noica rekindles universal themes of philosophy, but he deals with them in a profoundly original manner, based on the culture in which he lived and for which he even suffered persecution. The volume will be of great of interest to scholars and students in history of philosophy and continental philosophy, but also to people interested in the recent history of Eastern Europe and the political persecution that took place after WWII in those countries.

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Page Count

152

Publisher

punctum books

Published Date

ISBN 10

1947447521

ISBN 13

9781947447523

Book's by Constantin Paleologu

A Perspective on Stereophonic Acoustic Echo Cancellation

A Perspective on Stereophonic Acoustic Echo Cancellation

Sparse Adaptive Filters for Echo Cancellation

Sparse Adaptive Filters for Echo Cancellation

Liberalism, Constitutional Nationalism, and Minorities

Liberalism, Constitutional Nationalism, and Minorities

Pray for Brother Alexander

Pray for Brother Alexander

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