ecodis
efficient coding of digital signals

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 by C. Helmrich


About the project initiator

    ecodis :: Short Biography


portrait of Christian R. Helmrich, 2011

Christian R. Helmrich, born in 1981 in Cuxhaven, Germany, received his B. Sc. degree in computer science from
link to external web page Capitol Technology University (formerly Capitol College), Laurel, MD, USA, in 2005 and his M. Sc. degree in information and media technology from
link to external web page TU Hamburg-Harburg (TUHH), Germany, in 2008. Between 2008 and 2013 he worked on numerous speech and audio coding solutions at the
link to external web page Fraunhofer Institute for Integra­ted Circuits (IIS), Erlangen, Germany, partly as a Senior Engineer. From 2013 until 2016 Mr. Helmrich continued his work as a research assistant at the
link to external web page International AudioLabs Erlangen, a joint institution of Fraunhofer IIS and
link to external web page Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Germany, where he completed his Dr.-Ing. degree with a link to document dissertation on audio signal analysis and coding. In August 2016 Dr. Helmrich joined the Video Coding and Analytics (VCA) department of the
link to external web page Fraunhofer Heinrich Hertz Insti­tute (HHI), Berlin, Germany, as a next-generation video coding researcher and developer. His main interests include audio and video acquisition, coding, storage, and preservation as well as restoration from analog sources.

Dr. Helmrich is a Senior Member of the
link to external web page IEEE.



Christian Helmrich's publications in chronologically descending order, 2019–2007

2019

C. R. Helmrich, «Clean-up and Finalization of Perceptually Optimized QP Adaptation Method in VTM», document JVET-M0091, Marrakech, Jan. 2019. link to document Zip file.

C. R. Helmrich and B. Bross, «CE11: Very Strong Deblocking with Conditional Activation Signaling (Test 11.1.1)», document JVET-M0092, Marra­kech, Jan. 2019. link to document Zip file.

C. R. Helmrich, S. Bosse, M. Siekmann, H. Schwarz, D. Marpe, and T. Wiegand, «Per­cep­tually Optimized Bit-Allocation and Associated Distortion Measure for Block-Based Image or Video Coding», in Proc. IEEE Data Compression Conference (DCC), Snowbird, Mar. 2019. link to document Article manuscript, link to sub-page web page.

C. R. Helmrich, C. Rudat, T. Nguyen, H. Schwarz, D. Marpe, and T. Wiegand, «CE7-related: Joint Chroma Residual Coding with Multiple Modes», document JVET-N0282, Geneva, Mar. 2019. link to document Zip file.

J. Erfurt, C. R. Helmrich, S. Bosse, H. Schwarz, D. Marpe, and T. Wiegand, «A Study of the Perceptually Weighted Peak Signal-to-Noise Ratio (WPSNR) for Image Compres­sion», submitted to IEEE International Conference on Image Processing (ICIP), Taipei, Sep. 2019. link to document Article manuscript.

2018

C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Improved Perceptually Optimized QP Adaptation and Associated Distortion Measure», document JVET-K0206, Ljubljana, July 2018. link to document Zip file.

C. R. Helmrich, S. Bosse, P. Keydel, H. Schwarz, D. Marpe, and T. Wiegand, «A Spec­trally Adaptive Noise Filling Tool for Perceptual Transform Coding of Still Images», in Proc. IEEE International Conference on Consumer Electronics (ICCE), Berlin, Sep. 2018. link to document Article manuscript, link to sub-page web page.

C. R. Helmrich and B. Bross, «Very Strong Deblocking Filtering with Conditional Acti­vation Signaling», document JVET-L0523, Macau, Oct. 2018. link to document Zip file.

2017

C. R. Helmrich, Efficient Perceptual Audio Coding Using Cosine and Sine Modulated Lapped Transforms, Dr.-Ing. dissertation, Friedrich-Alexander-Universität Erlangen-Nürnberg, May 2017. link to document Third edition (Nov. 2017).

S. Bosse, C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Perceptually Optimized QP Adaptation and Associated Distortion Measure», document JVET-H0047, Macau, Oct. 2017. link to document Zip file (Dec. 2017).

2016

C. R. Helmrich and B. Edler, «Signal-Adaptive Switching of Overlap Ratio in Audio Transform Coding», in Proc. IEEE ICASSP, Shanghai, pp. 639–643, Mar. 2016. link to external web page Paper.

C. R. Helmrich and B. Edler, «Audio Coding Using Overlap and Kernel Adaptation», IEEE Signal Processing Letters, vol.23, no.5, pp. 590–594, May 2016. link to document Article manuscript.

C. R. Helmrich, R. Füg, and B. Edler, «Frequency-Domain Prediction for Audio Coding», submitted to IEEE Signal Processing Letters, Aug. 2016. link to document Article manuscript.

F. Schuh, S. Dick, R. Füg, C. R. Helmrich, N. Rettelbach, and T. Schwegler, «Efficient Multichannel Audio Transform Coding with Low Delay and Complexity», in Proc. AES 141st Convention, Los Angeles, preprint 9660, Oct. 2016. link to external web page Paper.

S. Disch, A. Niedermeier, C. R. Helmrich, C. Neukam, K. Schmidt, R. Geiger, J. Le­comte, F. Ghido, F. Nagel, and B. Edler, «Intelligent Gap Filling in Perceptual Transform Coding of Audio», in Proc. AES 141st Convention, Los Angeles, preprint 9661, Oct. 2016. link to external web page Paper.

2015

C. Helmrich, A. Niedermeier, S. Disch, and F. Ghido, «Spectral Envelope Reconstruction via IGF for Audio Transform Coding», in Proc. IEEE ICASSP, Brisbane, pp. 389–393, Apr. 2015. link to external web page Paper.

T. Bäckström and C. R. Helmrich, «Arithmetic Coding of Speech and Audio Spectra Using TCX Based on Linear Predictive Spectral Envelopes», in Proc. IEEE ICASSP, Brisbane, pp. 5127–5131, Apr. 2015. link to external web page Paper.

G. Fuchs, C. R. Helmrich, G. Marković, M. Neusinger, E. Ravelli, and T. Moriya, «Low Delay LPC and MDCT-Based Audio Coding in the EVS Codec», in Proc. IEEE ICASSP, Brisbane, pp. 5723–5727, Apr. 2015. link to external web page Paper.

E. Ravelli, C. R. Helmrich, G. Fuchs, and M. Multrus, «Low-Complexity and Robust Cod­ing Mode Decision in the EVS Coder», in Proc. IEEE ICASSP, Brisbane, pp. 5888–5892, Apr. 2015. link to external web page Paper.

T. Moriya, Y. Kamamoto, N. Harada, T. Bäckström, C. R. Helmrich, and G. Fuchs, «Harmonic Model for MDCT Based Audio Coding with LPC Envelope», in Proc. EURASIP 23rd EUSIPCO, Nice, pp. 794–798, Sep. 2015. link to document Paper.

C. R. Helmrich, A. Niedermeier, S. Bayer, and B. Edler, «Low-Complexity Semi-Para­metric Joint-Stereo Audio Transform Coding», in Proc. EURASIP 23rd EUSIPCO, Nice, pp. 799–803, Sep. 2015. link to document Paper.

C. R. Helmrich and B. Edler, «Signal-Adaptive Transform Kernel Switching for Stereo Audio Coding», in Proc. IEEE WASPAA, New Paltz, pp. 1–5, Oct. 2015. link to external web page Paper.

C. R. Helmrich and M. Fischer, «Low-Delay Transform Coding Using the MPEG-H Audio Codec», in Proc. AES 139th Convention, New York, preprint 9355, Oct. 2015. link to external web page Paper.

2014

C. R. Helmrich, G. Marković, and B. Edler, «Improved Low-Delay MDCT-Based Coding of Both Stationary and Transient Audio Signals», in Proc. IEEE ICASSP, Florence, Italy, pp. 6954–6958, May 2014. link to external web page Paper.

2013

M. Neuendorf, M. Multrus, N. Rettelbach, G. Fuchs, J. Robilliard, J. Lecomte, S. Wilde, S. Bayer, S. Disch, C. R. Helmrich, R. Lefebvre, P. Gournay, B. Bessette, J. Lapierre, K. Kjörling, H. Purnhagen, L. Villemoes, W. Oomen, E. Schuijers, K. Kikuiri, T. Chinen, T. Norimatsu, K.-S. Chong, E. Oh, M. Kim, S. Quackenbush, and B. Grill, «The ISO/MPEG Unified Speech and Audio Coding Standard—Consistent High Quality for All Content Types and at All Bitrates», Journal of the AES, vol. 61, no. 12, pp. 956–977, Dec. 2013. link to external web page Journal article.

2012

M. Neuendorf, M. Multrus, N. Rettelbach, G. Fuchs, J. Robilliard, J. Lecomte, S. Wilde, S. Bayer, S. Disch, C. R. Helmrich, R. Lefebvre, P. Gournay, B. Bessette, J. Lapierre, K. Kjörling, H. Purnhagen, L. Villemoes, W. Oomen, E. Schuijers, K. Kikuiri, T. Chinen, T. Norimatsu, K.-S. Chong, E. Oh, M. Kim, S. Quackenbush, and B. Grill, «MPEG Unified Speech and Audio Coding—The ISO/MPEG Standard for High-Efficiency Audio Coding of All Content Types», in Proc. AES 132nd Convention, Budapest, preprint 8654, Apr. 2012. link to external web page Paper.

2011

C. R. Helmrich, P. Carlsson, S. Disch, B. Edler, J. Hilpert, M. Neusinger, H. Purnhagen, N. Rettelbach, J. Robilliard, and L. Villemoes, «Efficient Transform Coding of Two-Channel Audio Signals by Means of Complex-Valued Stereo Prediction», in Proc. IEEE ICASSP, Prague, pp. 497–500, May 2011. link to document Paper.

2010

C. R. Helmrich, «On the Use of Sums of Sines in the Design of Signal Windows», in Proc. DAFx-10, Graz, poster session 8, Sep. 2010. link to document Paper.

2008

M. Holters, C. R. Helmrich, and U. Zölzer, «Delay-Free Audio Coding Based on ADPCM and Error Feedback», in Proc. DAFx-08, Espoo, paper session 2d, Sep. 2008. link to document Paper.

2007

C. R. Helmrich, M. Holters, and U. Zölzer, «Improved Psychoacoustic Noise Shaping for Requantization of High-Resolution Digital Audio», in Proc. AES 31st International Con­ference, London, June 2007. link to external web page Paper.

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