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Koch. “Electromagnetic Field Structure and Normal Mode Coupling in Photonic Crystal Nanocavities.” <i>Optics Express</i> 13, no. 13 (2005). <a href=\"https://doi.org/10.1364/opex.13.004980\">https://doi.org/10.1364/opex.13.004980</a>."},"volume":13,"author":[{"full_name":"Dineen, C.","last_name":"Dineen","first_name":"C."},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158","first_name":"Jens"},{"full_name":"Zakharian, A.R.","last_name":"Zakharian","first_name":"A.R."},{"first_name":"J.V.","last_name":"Moloney","full_name":"Moloney, J.V."},{"first_name":"S.W.","full_name":"Koch, S.W.","last_name":"Koch"}],"date_updated":"2022-01-06T07:00:42Z","oa":"1","doi":"10.1364/opex.13.004980","type":"journal_article","status":"public","urn":"42523","user_id":"158","_id":"4252","file_date_updated":"2018-09-04T19:28:30Z","extern":"1","article_type":"original","article_number":"4980","issue":"13","year":"2005","date_created":"2018-08-29T09:07:11Z","publisher":"The Optical Society","title":"Electromagnetic field structure and normal mode coupling in photonic crystal nanocavities","publication":"Optics Express","file":[{"date_updated":"2018-09-04T19:28:30Z","date_created":"2018-08-29T09:07:35Z","creator":"hclaudia","file_size":1100329,"file_id":"4253","access_level":"open_access","file_name":"2005 Dineen,Förstner,Zakharian,Moloney,Koch_Electromagnetic field structure and normal mode coupling in photonic crystal nanocavities.pdf","content_type":"application/pdf","relation":"main_file"}],"abstract":[{"text":"The electromagnetic field of a high-quality photonic crystal nanocavity is computed using the finite difference time domain method. It is shown that a separatrix occurs in the local energy flux discriminating between predominantly near and far field components. Placing a two-level atom into the cavity leads to characteristic field modifications and normalmode\r\nsplitting in the transmission spectra.","lang":"eng"}],"language":[{"iso":"eng"}],"keyword":["tet_topic_phc"],"ddc":["530"]},{"type":"journal_article","urn":"42624","status":"public","_id":"4262","user_id":"158","article_number":"067601","article_type":"original","extern":"1","file_date_updated":"2018-09-04T19:33:01Z","has_accepted_license":"1","publication_identifier":{"issn":["0031-9007","1079-7114"]},"publication_status":"published","intvolume":"        94","citation":{"chicago":"Töben, L., L. Gundlach, R. Ernstorfer, R. Eichberger, T. Hannappel, F. Willig, A. Zeiser, et al. “Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100).” <i>Physical Review Letters</i> 94, no. 6 (2005). <a href=\"https://doi.org/10.1103/physrevlett.94.067601\">https://doi.org/10.1103/physrevlett.94.067601</a>.","ieee":"L. Töben <i>et al.</i>, “Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100),” <i>Physical Review Letters</i>, vol. 94, no. 6, 2005.","ama":"Töben L, Gundlach L, Ernstorfer R, et al. Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100). <i>Physical Review Letters</i>. 2005;94(6). doi:<a href=\"https://doi.org/10.1103/physrevlett.94.067601\">10.1103/physrevlett.94.067601</a>","apa":"Töben, L., Gundlach, L., Ernstorfer, R., Eichberger, R., Hannappel, T., Willig, F., … Schmidt, W. G. (2005). Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100). <i>Physical Review Letters</i>, <i>94</i>(6). <a href=\"https://doi.org/10.1103/physrevlett.94.067601\">https://doi.org/10.1103/physrevlett.94.067601</a>","bibtex":"@article{Töben_Gundlach_Ernstorfer_Eichberger_Hannappel_Willig_Zeiser_Förstner_Knorr_Hahn_et al._2005, title={Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100)}, volume={94}, DOI={<a href=\"https://doi.org/10.1103/physrevlett.94.067601\">10.1103/physrevlett.94.067601</a>}, number={6067601}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Töben, L. and Gundlach, L. and Ernstorfer, R. and Eichberger, R. and Hannappel, T. and Willig, F. and Zeiser, A. and Förstner, Jens and Knorr, A. and Hahn, P. H. and et al.}, year={2005} }","short":"L. Töben, L. Gundlach, R. Ernstorfer, R. Eichberger, T. Hannappel, F. Willig, A. Zeiser, J. Förstner, A. Knorr, P.H. Hahn, W.G. Schmidt, Physical Review Letters 94 (2005).","mla":"Töben, L., et al. “Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100).” <i>Physical Review Letters</i>, vol. 94, no. 6, 067601, American Physical Society (APS), 2005, doi:<a href=\"https://doi.org/10.1103/physrevlett.94.067601\">10.1103/physrevlett.94.067601</a>."},"oa":"1","date_updated":"2022-01-06T07:00:44Z","volume":94,"author":[{"first_name":"L.","full_name":"Töben, L.","last_name":"Töben"},{"full_name":"Gundlach, L.","last_name":"Gundlach","first_name":"L."},{"full_name":"Ernstorfer, R.","last_name":"Ernstorfer","first_name":"R."},{"first_name":"R.","full_name":"Eichberger, R.","last_name":"Eichberger"},{"first_name":"T.","last_name":"Hannappel","full_name":"Hannappel, T."},{"full_name":"Willig, F.","last_name":"Willig","first_name":"F."},{"last_name":"Zeiser","full_name":"Zeiser, A.","first_name":"A."},{"id":"158","full_name":"Förstner, Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens"},{"last_name":"Knorr","full_name":"Knorr, A.","first_name":"A."},{"full_name":"Hahn, P. H.","last_name":"Hahn","first_name":"P. H."},{"first_name":"W. G.","full_name":"Schmidt, W. G.","last_name":"Schmidt"}],"doi":"10.1103/physrevlett.94.067601","publication":"Physical Review Letters","abstract":[{"lang":"eng","text":"Time-dependent two-photon photoemission spectra are used to resolve the femtosecond dynamics of\r\nhot electrons at the energetically lowest surface resonance of reconstructed InP(100). Two different cases\r\nare studied, where electrons either are lifted into the surface resonance via a direct optical transition or are\r\ncaptured from bulk states. These data are the first of this kind recorded with a time resolution below 70 fs.\r\nThe microscopic analysis shows that electron-phonon scattering is a major mechanism for electron\r\ntransfer between surface and bulk states."}],"file":[{"relation":"main_file","content_type":"application/pdf","file_name":"2005 Toeben et al_Femtosecond transfer dynamics of photogenerated electrons at a surface resonance of reconstructed InP(100).pdf","access_level":"open_access","file_id":"4263","file_size":311846,"date_created":"2018-08-29T09:25:11Z","creator":"hclaudia","date_updated":"2018-09-04T19:33:01Z"}],"ddc":["530"],"language":[{"iso":"eng"}],"issue":"6","year":"2005","publisher":"American Physical Society (APS)","date_created":"2018-08-29T09:24:11Z","title":"Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100)"},{"status":"public","type":"journal_article","extern":"1","file_date_updated":"2018-12-18T13:31:04Z","_id":"5660","department":[{"_id":"277"}],"user_id":"61579","intvolume":"         8","page":"22-25","citation":{"apa":"Schryen, G. (2005). A honeypot for the exploration of spammers’ behaviour. <i>IATAC IAnewsletter</i>, <i>8</i>(3), 22–25.","bibtex":"@article{Schryen_2005, title={A honeypot for the exploration of spammers’ behaviour}, volume={8}, number={3}, journal={IATAC IAnewsletter}, publisher={United States Department of Defense}, author={Schryen, Guido}, year={2005}, pages={22–25} }","short":"G. Schryen, IATAC IAnewsletter 8 (2005) 22–25.","mla":"Schryen, Guido. “A Honeypot for the Exploration of Spammers’ Behaviour.” <i>IATAC IAnewsletter</i>, vol. 8, no. 3, United States Department of Defense, 2005, pp. 22–25.","ama":"Schryen G. A honeypot for the exploration of spammers’ behaviour. <i>IATAC IAnewsletter</i>. 2005;8(3):22-25.","ieee":"G. Schryen, “A honeypot for the exploration of spammers’ behaviour,” <i>IATAC IAnewsletter</i>, vol. 8, no. 3, pp. 22–25, 2005.","chicago":"Schryen, Guido. “A Honeypot for the Exploration of Spammers’ Behaviour.” <i>IATAC IAnewsletter</i> 8, no. 3 (2005): 22–25."},"has_accepted_license":"1","oa":"1","date_updated":"2022-01-06T07:02:24Z","volume":8,"author":[{"first_name":"Guido","full_name":"Schryen, Guido","id":"72850","last_name":"Schryen"}],"file":[{"relation":"main_file","content_type":"application/pdf","file_name":"Honeypot for the Exploration of Spammers Behavior - journal version.pdf","access_level":"open_access","file_id":"6330","file_size":3394223,"date_created":"2018-12-18T13:31:04Z","creator":"hsiemes","date_updated":"2018-12-18T13:31:04Z"}],"publication":"IATAC IAnewsletter","ddc":["000"],"language":[{"iso":"eng"}],"year":"2005","issue":"3","title":"A honeypot for the exploration of spammers' behaviour","publisher":"United States Department of Defense","date_created":"2018-11-14T14:55:09Z"},{"title":"An e-mail honeypot addressing spammers' behavior in collecting and applying addresses","publisher":"Westpoint","date_created":"2018-11-14T14:55:48Z","year":"2005","keyword":["Spam","ham","e-mail","honeypot","address obscuring technique","address taxonomy"],"ddc":["000"],"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Spam has become one of the most annoying and costly phenomenon in the Internet. Valid e-mail addresses belong to the most valuable resources of spammers, but little is known about spammers? behavior when collecting and harvesting addresses and spammers? capabilities and interest in carefully directed, consumer-oriented marketing have not been explored yet. Gaining insight into spammers? ways to obtain and (mis)use e-mail addresses is useful in many ways, e.g. for the assessment of the effectiveness of address obscuring techniques and the usability and necessity of hiding e-mail addresses on the Internet. This paper presents a spam honeypot project in progress addressing these issues by systematically placing e-mail addresses in the Internet and analyzing received e-mails. The honeypot?s conceptual framework, its implementation, and first empirical results are presented. Finally, an outlook on further work and activities is provided."}],"file":[{"content_type":"application/pdf","relation":"main_file","date_created":"2018-12-18T13:31:41Z","creator":"hsiemes","date_updated":"2018-12-18T13:31:41Z","file_id":"6331","access_level":"open_access","file_name":"Schryen - An e-mail honeypot addressing spammers' behavior in collecting and applying addresses.pdf","file_size":119362}],"publication":"Proceedings of the 6th IEEE Information Assurance Workshop","date_updated":"2022-01-06T07:02:24Z","oa":"1","author":[{"first_name":"Guido","last_name":"Schryen","full_name":"Schryen, Guido","id":"72850"}],"page":"37-41","citation":{"chicago":"Schryen, Guido. “An E-Mail Honeypot Addressing Spammers’ Behavior in Collecting and Applying Addresses.” In <i>Proceedings of the 6th IEEE Information Assurance Workshop</i>, 37–41. Westpoint, 2005.","ieee":"G. Schryen, “An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses,” in <i>Proceedings of the 6th IEEE Information Assurance Workshop</i>, 2005, pp. 37–41.","ama":"Schryen G. An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses. In: <i>Proceedings of the 6th IEEE Information Assurance Workshop</i>. Westpoint; 2005:37-41.","apa":"Schryen, G. (2005). An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses. In <i>Proceedings of the 6th IEEE Information Assurance Workshop</i> (pp. 37–41). Westpoint.","mla":"Schryen, Guido. “An E-Mail Honeypot Addressing Spammers’ Behavior in Collecting and Applying Addresses.” <i>Proceedings of the 6th IEEE Information Assurance Workshop</i>, Westpoint, 2005, pp. 37–41.","bibtex":"@inproceedings{Schryen_2005, title={An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses}, booktitle={Proceedings of the 6th IEEE Information Assurance Workshop}, publisher={Westpoint}, author={Schryen, Guido}, year={2005}, pages={37–41} }","short":"G. Schryen, in: Proceedings of the 6th IEEE Information Assurance Workshop, Westpoint, 2005, pp. 37–41."},"has_accepted_license":"1","extern":"1","file_date_updated":"2018-12-18T13:31:41Z","_id":"5661","department":[{"_id":"277"}],"user_id":"61579","status":"public","type":"conference"},{"user_id":"44006","department":[{"_id":"54"}],"_id":"11803","language":[{"iso":"eng"}],"type":"conference","publication":"International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)","status":"public","abstract":[{"lang":"eng","text":"In this paper we propose a novel adaptation algorithm for Filter-and-Sum beamforming in spatially correlated noise. Deterministic and stochastic gradient ascent algorithms are derived from a constrained optimization problem, which iteratively estimate the principal eigenvecto r of a generalized eigenvalue problem. The method does not require an explicit estimation of the speaker location. It is shown that the well-known Delay-and-Sum beamformer and the previously introduced Filter-and-Sum beamformer in spatially white noise are obtained as special cases. Further, bounds on the maximally achievable SNR gains are derived and it is shown that the proposed adaptation algorithm is able to approach these performance bounds."}],"author":[{"first_name":"Reinhold","last_name":"Haeb-Umbach","full_name":"Haeb-Umbach, Reinhold","id":"242"},{"first_name":"Ernst","full_name":"Warsitz, Ernst","last_name":"Warsitz"}],"date_created":"2019-07-12T05:28:33Z","date_updated":"2022-01-06T06:51:09Z","oa":"1","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2005/HaWa05.pdf","open_access":"1"}],"title":"Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise","citation":{"apa":"Haeb-Umbach, R., &#38; Warsitz, E. (2005). Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise. In <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)</i>.","short":"R. Haeb-Umbach, E. Warsitz, in: International Workshop on Acoustic Echo and Noise Control (IWAENC 2005), 2005.","bibtex":"@inproceedings{Haeb-Umbach_Warsitz_2005, title={Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise}, booktitle={International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)}, author={Haeb-Umbach, Reinhold and Warsitz, Ernst}, year={2005} }","mla":"Haeb-Umbach, Reinhold, and Ernst Warsitz. “Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise.” <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)</i>, 2005.","ama":"Haeb-Umbach R, Warsitz E. Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise. In: <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)</i>. ; 2005.","chicago":"Haeb-Umbach, Reinhold, and Ernst Warsitz. “Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise.” In <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)</i>, 2005.","ieee":"R. Haeb-Umbach and E. Warsitz, “Adaptive Filter-and-Sum Beamforming in Spatially Correlated Noise,” in <i>International Workshop on Acoustic Echo and Noise Control (IWAENC 2005)</i>, 2005."},"year":"2005"},{"status":"public","abstract":[{"lang":"eng","text":"The transmission errors in a wireless or packet oriented network may dramatically decrease the performance of a distributed speech recognition DSR) system. Error concealment has been shown to be an effective way to mantain an acceptable word error rate when dealing with error prone communication channels. In this paper we propose an extension of our previously introduced soft features approach for the case that the soft-output of the channel decoder is not available at the server side of the DSR system. We found a simple method to estimate bit reliability information which still gives good speech recognition results. It is shown that some other error concealment schemes turn out to be special cases of the method proposed here."}],"type":"conference","publication":"Interspeech 2005","language":[{"iso":"eng"}],"user_id":"44006","department":[{"_id":"54"}],"_id":"11827","citation":{"bibtex":"@inproceedings{Ion_Haeb-Umbach_2005, title={A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition}, booktitle={Interspeech 2005}, author={Ion, Valentin and Haeb-Umbach, Reinhold}, year={2005} }","mla":"Ion, Valentin, and Reinhold Haeb-Umbach. “A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition.” <i>Interspeech 2005</i>, 2005.","short":"V. Ion, R. Haeb-Umbach, in: Interspeech 2005, 2005.","apa":"Ion, V., &#38; Haeb-Umbach, R. (2005). A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition. In <i>Interspeech 2005</i>.","ieee":"V. Ion and R. Haeb-Umbach, “A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition,” in <i>Interspeech 2005</i>, 2005.","chicago":"Ion, Valentin, and Reinhold Haeb-Umbach. “A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition.” In <i>Interspeech 2005</i>, 2005.","ama":"Ion V, Haeb-Umbach R. A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition. In: <i>Interspeech 2005</i>. ; 2005."},"year":"2005","main_file_link":[{"open_access":"1","url":"https://groups.uni-paderborn.de/nt/pubs/2005/IoHa05-1.pdf"}],"title":"A Unified Probabilistic Approach to Error Concealment for Distributed Speech Recognition","author":[{"full_name":"Ion, Valentin","last_name":"Ion","first_name":"Valentin"},{"last_name":"Haeb-Umbach","id":"242","full_name":"Haeb-Umbach, Reinhold","first_name":"Reinhold"}],"date_created":"2019-07-12T05:29:01Z","date_updated":"2022-01-06T06:51:10Z","oa":"1"},{"title":"A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services","doi":"10.1109/ICASSP.2005.1415118","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2005/IoHa05-2.pdf","open_access":"1"}],"oa":"1","date_updated":"2022-01-06T06:51:10Z","volume":1,"author":[{"first_name":"Valentin","full_name":"Ion, Valentin","last_name":"Ion"},{"first_name":"Reinhold","full_name":"Haeb-Umbach, Reinhold","id":"242","last_name":"Haeb-Umbach"}],"date_created":"2019-07-12T05:29:02Z","year":"2005","page":"333-336","intvolume":"         1","citation":{"chicago":"Ion, Valentin, and Reinhold Haeb-Umbach. “A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services.” In <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>, 1:333–36, 2005. <a href=\"https://doi.org/10.1109/ICASSP.2005.1415118\">https://doi.org/10.1109/ICASSP.2005.1415118</a>.","ieee":"V. Ion and R. Haeb-Umbach, “A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services,” in <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>, 2005, vol. 1, pp. 333–336.","ama":"Ion V, Haeb-Umbach R. A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services. In: <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>. Vol 1. ; 2005:333-336. doi:<a href=\"https://doi.org/10.1109/ICASSP.2005.1415118\">10.1109/ICASSP.2005.1415118</a>","bibtex":"@inproceedings{Ion_Haeb-Umbach_2005, title={A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services}, volume={1}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2005.1415118\">10.1109/ICASSP.2005.1415118</a>}, booktitle={IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)}, author={Ion, Valentin and Haeb-Umbach, Reinhold}, year={2005}, pages={333–336} }","mla":"Ion, Valentin, and Reinhold Haeb-Umbach. “A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services.” <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>, vol. 1, 2005, pp. 333–36, doi:<a href=\"https://doi.org/10.1109/ICASSP.2005.1415118\">10.1109/ICASSP.2005.1415118</a>.","short":"V. Ion, R. Haeb-Umbach, in: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005), 2005, pp. 333–336.","apa":"Ion, V., &#38; Haeb-Umbach, R. (2005). A Comparison of Soft-Feature Distributed Speech Recognition with Candidate Codecs for Speech Enabled Mobile Services. In <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i> (Vol. 1, pp. 333–336). <a href=\"https://doi.org/10.1109/ICASSP.2005.1415118\">https://doi.org/10.1109/ICASSP.2005.1415118</a>"},"keyword":["adaptive codes","adaptive multirate codec","AMR","distributed speech recognition","ETSI","extended advanced front-end","recognition performance","SFDSR","simulated GSM transmission","soft-feature distributed speech recognition","speech codecs","speech coding","speech recognition","variable rate codes","XAFE"],"language":[{"iso":"eng"}],"_id":"11828","department":[{"_id":"54"}],"user_id":"44006","abstract":[{"text":"In this paper we present a comparison of the recently proposed Soft-Feature Distributed Speech Recognition (SFDSR) with the two evaluated candidate codecs for Speech Enabled Services over wireless networks: Adaptive Multirate Codec (AMR) and the ETSI Extended Advanced Front-End for Distributed Speech Recognition (XAFE). It is shown that SFDSR achieves the best recognition performance on a simulated GSM transmission, followed by XAFE and AMR.We also present some new results concerning SFDSR which demonstrate the versatility of the approach. Further, a simple method is introduced which considerably reduces the computational effort.","lang":"eng"}],"status":"public","publication":"IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)","type":"conference"},{"language":[{"iso":"eng"}],"keyword":["acoustic filter-and-sum beamforming","acoustic room impulses","acoustic signal processing","adaptive principal component analysis","adaptive signal processing","architectural acoustics","constrained optimization problem","cross power spectral density","deterministic algorithm","deterministic algorithms","distant-talking environments","eigenvalues and eigenfunctions","eigenvector","enhanced signal","filter-and-sum beamformer","FIR filter coefficients","FIR filter coefficients","FIR filters","gradient methods","human-machine interfaces","iterative estimation","iterative methods","largest eigenvalue","microphone signals","multichannel signal processing","optimisation","principal component analysis","spectral analysis","stochastic gradient ascent algorithm","stochastic processes"],"user_id":"44006","department":[{"_id":"54"}],"_id":"11930","status":"public","abstract":[{"text":"For human-machine interfaces in distant-talking environments multichannel signal processing is often employed to obtain an enhanced signal for subsequent processing. In this paper we propose a novel adaptation algorithm for a filter-and-sum beamformer to adjust the coefficients of FIR filters to changing acoustic room impulses, e.g. due to speaker movement. A deterministic and a stochastic gradient ascent algorithm are derived from a constrained optimization problem, which iteratively estimates the eigenvector corresponding to the largest eigenvalue of the cross power spectral density of the microphone signals. The method does not require an explicit estimation of the speaker location. The experimental results show fast adaptation and excellent robustness of the proposed algorithm.","lang":"eng"}],"type":"conference","publication":"IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)","main_file_link":[{"url":"https://groups.uni-paderborn.de/nt/pubs/2005/WaHa05.pdf","open_access":"1"}],"doi":"10.1109/ICASSP.2005.1416129","title":"Acoustic filter-and-sum beamforming by adaptive principal component analysis","author":[{"first_name":"Ernst","last_name":"Warsitz","full_name":"Warsitz, Ernst"},{"first_name":"Reinhold","id":"242","full_name":"Haeb-Umbach, Reinhold","last_name":"Haeb-Umbach"}],"date_created":"2019-07-12T05:31:00Z","volume":4,"date_updated":"2022-01-06T06:51:12Z","oa":"1","citation":{"ieee":"E. Warsitz and R. Haeb-Umbach, “Acoustic filter-and-sum beamforming by adaptive principal component analysis,” in <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>, 2005, vol. 4, p. iv/797-iv/800 Vol. 4.","chicago":"Warsitz, Ernst, and Reinhold Haeb-Umbach. “Acoustic Filter-and-Sum Beamforming by Adaptive Principal Component Analysis.” In <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>, 4:iv/797-iv/800 Vol. 4, 2005. <a href=\"https://doi.org/10.1109/ICASSP.2005.1416129\">https://doi.org/10.1109/ICASSP.2005.1416129</a>.","ama":"Warsitz E, Haeb-Umbach R. Acoustic filter-and-sum beamforming by adaptive principal component analysis. In: <i>IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2005)</i>. 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