Monday, 10 April 2017 17:15

Nonlinear Echo Suppression

Details    
Talker Ingo Schalk-Schupp
Affiliation Nuance Communications,
Ulm, Germany
Date 10.04.2017
Time 17:15 h
Place Aquarium, Building D, Faculty of Engineering,
Kaiserstr. 2., 24143 Kiel

 

Abstract

This presentation provides a short overview concerning acoustic echo cancellation and acoustic echo suppression methods followed by a more in-depth discussion of new methods dealing with Hammerstein-type nonlinear distortions.

The Hammerstein system is divided into a linear and a parallel nonlinear part by an alternative way to define of the linear one. The implications of this separation definition and its relation to linear acoustic echo cancellation are illuminated.

Based on this approach, and assuming a converged linear echo canceller, a suppression approach for nonlinearly distorted acoustic echo signal components is introduced, the essential component of which is the nonlinear echo power spectral density estimation, which depends on one unknown real scalar parameter.

Subsequently, an identification algorithm for said parameter is presented, which results in a usable nonlinear echo suppressor still under the assumption of a converged linear echo canceller. Moreover, a generic comprehensive evaluation method for suppressor-type algorithms is advertised.

Finally, the challenge of concurrently adaptive linear echo canceller and nonlinear echo suppressor is analyzed and a solution for a full system is presented. After listening to several audio examples, the audience is invited to discuss the presentation’s contents.

 

Short biography

Ingo Schalk-Schupp studied systems engineering and technical cybernetics at Otto von Guericke University in Magdeburg, Germany. He graduated as a diploma engineer (Diplomingenieur) in 2012 with a diploma thesis titled “Speech Signal Enhancement in Automotive Environments” composed at Nuance Communications in Ulm, Germany. The thesis comprised two patent applications and was granted the best thesis award by the “Magdeburger Kybernetiker e.V.” Since 2012, he has been a PhD student with Nuance in Ulm and is supervised by Professor Andreas Wendemuth, Chair of Cognitive Systems at Otto von Guericke University Magdeburg. This presentation reflects the author’s findings from his PhD research.

Tuesday, 06 December 2016 17:15

25 Years of Audio Coding: How We Arrived at Audio Playback on iPhone and its Underlying Technology

Details    
Talker Dr. Akihiko (Ken) Sugiyama
Date 06.12.2016
Time 17:15 h
Place Aquarium, Building D, Faculty of Engineering,
Kaiserstr. 2., 24143 Kiel

 

Abstract

This lecture presents the 25-year history of audio coding technology. Focusing on MPEG Audio Coding that is the most widely used international standard in our daily life, some im-portant techniques we contributed are explained along the history. Recent standardization activities are briefly touched to show the unlimited potential of audio coding. An encounter of the Silicon Audio, developed in 1994 and the real ancestor of iPod, is the highlight of this lecture, which cannot be experienced elsewhere. The audience will see how iPod started its function 20 years ago.

 

Short biography

Akihiko Sugiyama (a.k.a. Ken Sugiyama), affiliated with NEC Data Science Research Labs., has been engaged in a wide variety of research projects in signal processing such as audio coding and interference/noise control. His team developed the world's first Silicon Audio in 1994, the ancestor of iPod. He served as Chair of Audio and Acoustic Signal Processing Tech. Committee, IEEE Signal Processing Society (SPS) [2011-2012], as associate editors for several jour-nals such as IEEE Trans. SP [1994-1996], as the Secretary and a Member at Large to the Con-ference Board of SPS [2010-2011], as a member of the Awards Board of SPS [2015], and as the Chair of Japan Chapter of SPS [2010-2011]. He was a Technical Program Chair for ICASSP2012. He has contributed to 16 chapters of books and is the inventor of over 150 registered patents with more pending applications in the field of signal processing in Japan and overseas. He received 13 awards such as the 2002 IEICE Best Paper Award, the 2006 IEICE Achievement Award, and the 2013 Ichimura Industry Award. He is Fellow of IEEE and IEICE, and a Distinguished Lecturer in 2014 and 2015 for IEEE SPS. He is also known as a big host for a total of over 70 internship students.

Tuesday, 06 December 2016 15:00

Adaptive Noise Cancellers: Challenges, Solutions, and Successful Applications of a Classical Technique

Details    
Talker Dr. Akihiko (Ken) Sugiyama
Date 06.12.2016
Time 15:00 h
Place Aquarium, Building D, Faculty of Engineering,
Kaiserstr. 2., 24143 Kiel

 

Abstract

This lecture presents A to Z of adaptive noise cancellers (ANCs) which was originally proposed by Widrow et al. in 1975. It has an inherent challenge that is interference by the target signal. Solutions to this problem are explained from a primitive one to the most sophisticated one. A common idea among those solutions is to control a coefficient-adaptation stepsize based on an estimated signal-to-noise ratio (SNR) at the primary input. Other techniques include design of SNR-stepsize conversion function, use of a relative coefficient magnitude normalized by the reference signal power for stepsize control, and conditional cancellation. A carefully designed adaptive stepsize provides robustness to interference by the target signal. Conditional cancellation guarantees that the noise signal power is reduced by noise-replica subtraction. Two applications, namely, robot audition and dual-microphone signal enhancement in mobile phone handsets, are presented with video and sound demonstrations.

 

Short biography

Akihiko Sugiyama (a.k.a. Ken Sugiyama), affiliated with NEC Data Science Research Labs., has been engaged in a wide variety of research projects in signal processing such as audio coding and interference/noise control. His team developed the world's first Silicon Audio in 1994, the ancestor of iPod. He served as Chair of Audio and Acoustic Signal Processing Tech. Committee, IEEE Signal Processing Society (SPS) [2011-2012], as associate editors for several jour-nals such as IEEE Trans. SP [1994-1996], as the Secretary and a Member at Large to the Con-ference Board of SPS [2010-2011], as a member of the Awards Board of SPS [2015], and as the Chair of Japan Chapter of SPS [2010-2011]. He was a Technical Program Chair for ICASSP2012. He has contributed to 16 chapters of books and is the inventor of over 150 registered patents with more pending applications in the field of signal processing in Japan and overseas. He received 13 awards such as the 2002 IEICE Best Paper Award, the 2006 IEICE Achievement Award, and the 2013 Ichimura Industry Award. He is Fellow of IEEE and IEICE, and a Distinguished Lecturer in 2014 and 2015 for IEEE SPS. He is also known as a big host for a total of over 70 internship students.

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