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Signal Processing
Biography
Heiko Purnhagen was born in 1969 in Bremen, Germany. He received
the M.S. degree (Dipl.-Ing.) in Electrical Engineering from the University of Hannover,
Germany, in 1994, concluded by a final thesis project on Automatic Speech Recognition carried out at the
Norwegian Institute of Technology,
Trondheim, Norway. From 1996 to 2002, he was with the Information Technology
Laboratory at the University of Hannover, where he worked on very low bit rate audio coding using
parametric signal representations, and where he received the
Ph.D. degree (Dr.-Ing.) in 2008.
In 2002, he joined Coding Technologies (now Dolby Sweden) in Stockholm, Sweden,
where he is working on research, development, and standardization of
low bit rate audio and speech coding systems. He contributed to the
development of parametric techniques for efficient coding of stereo
and multichannel signals, and his recent research activities include
the unified coding of speech and audio signals.
Since 1996, he is an active member of the ISO MPEG standardization
committee and editor or co-editor of several MPEG standards. He is the
principal author of the MPEG-4 parametric audio coding specification
known as HILN (Harmonic and Individual Lines plus Noise) and
contributed to the standardization of MPEG-4 High Efficiency AAC, the
MPEG-4 Parametric Stereo coding tool, and MPEG Surround.
Dr. Purnhagen is a member of the AES and the IEEE and has published various papers
on low bit rate audio coding and related subjects. He enjoys listening
to live performances of jazz and free improvised music, and tries to
capture them in his concert photography.
Contact
Publications
Overview
H. Purnhagen,
Very low bit rate parametric audio coding,
Dissertation, Universität Hannover, DE, 2008.
Abstract
Book
Slides
J. Herre and H. Purnhagen,
“General audio coding,”
in The MPEG-4 Book, F. Pereira and T. Ebrahimi, Eds.,
chapter 11. Prentice-Hall, Englewood Cliffs, NJ, US, 2002.
Info
A.C. den Brinker, J. Breebaart, P. Ekstrand, J. Engdegård, F. Henn,
K. Kjörling, W. Oomen, and H. Purnhagen,
“An Overview of the Coding Standard MPEG-4 Audio Amendments
1 and 2: HE-AAC, SSC, and HE-AAC v2,”
EURASIP Journal on Audio, Speech, and Music Processing,
Volume 2009, Article ID 468971, 21 pages, 2009,
doi:10.1155/2009/468971.
Abstract
Paper
J. Herre, K. Kjörling, J. Breebaart, C. Faller, S. Disch,
H. Purnhagen, J. Koppens, J. Hilpert, J. Rödén, W. Oomen,
K. Linzmeier, and K. S. Chong,
“MPEG Surround - The ISO/MPEG standard for efficient and
compatible multichannel audio coding,”
J. Audio Eng. Soc., Vol. 56, no. 1, pp. 932-955,
Nov. 2008.
Abstract
A. Woywodt, A. Herrmann, J. T. Kielstein, H. Haller, M. Haubitz, and
H. Purnhagen,
“A novel multimedia tool to improve bedside teaching of cardiac
auscultation,”
Postgraduate Medical Journal, vol. 80, pp. 355-357, June 2004.
Abstract
H. Purnhagen,
“Der MPEG-4 Audio Standard - ein Überblick,”
Rundfunktechnische Mitteilungen (RTM), vol. 44, no. 2, Apr.
2000.
Abstract
M. L. Valero, A. Hölzer, M. Schnell, J. Hilpert, M. Lutzky, J. Engdegård, H. Purnhagen, P. Ekstrand, K. Kjörling
“A New Parametric Stereo and Multichannel Extension for MPEG-4 Enhanced Low Delay AAC (AAC-ELD),”
in AES 128th Convention, London, UK, May 2010,
Preprint 8099.
Abstract
H. Purnhagen, A. Ehret, J. Rödén, and A. Gröschel,
“A novel approach to up-mix stereo to surround based on MPEG
Surround technology,”
in AES 122nd Convention, Vienna, AT, May 2007,
Preprint 6991.
Abstract
A. Ehret, A. Gröschel, H. Purnhagen, and J. Rödén,
“Coding of "2+2+2" surround sound content using the MPEG Surround
standard,”
in AES 122nd Convention, Vienna, AT, May 2007,
Preprint 6992.
Abstract
J. Herre, K. Kjörling, J. Breebaart, C. Faller, S. Disch, H. Purnhagen,
J. Koppens, J. Hilpert, J. Rödén, W. Oomen, K. Linzmeier, and K. S. Chong,
“MPEG Surround - the ISO/MPEG standard for efficient and
compatible multi-channel audio coding,”
in AES 122nd Convention, Vienna, AT, May 2007,
Preprint 7084.
Abstract
J. Breebaart, J. Herre, C. Faller, J. Rödén, F. Myburg, S. Disch, H. Purnhagen,
G. Hotho, M. Neusinger, K. Kjörling, and W. Oomen,
“MPEG Spatial Audio Coding / MPEG Surround: overview and current
status,”
in AES 119th Convention, New York, NY, US, Oct. 2005,
Preprint 6599.
Abstract
L. Villemoes, J. Herre, J. Breebaart, G. Hotho, S. Disch, H. Purnhagen, and
K. Kjörling,
“MPEG Surround: The forthcoming ISO standard for spatial audio
coding,”
in Proc. AES 28th Int. Conf., Piteå, SE, June 2006.
Abstract
J. Herre, H. Purnhagen, J. Breebaart, C. Faller, S. Disch, K. Kjörling,
E. Schuijers, J. Hilpert, and F. Myburg,
“The reference model architecture for MPEG spatial audio coding,”
in AES 118th Convention, Barcelona, ES, May 2005,
Preprint 6447.
Abstract
A. Ehret, H. Hörich, K. Kjörling, H. Purnhagen, and J. Rödén,
“aacPlus, only a low-bitrate codec?,”
in AES 117th Convention, San Francisco, CA, US, Oct. 2004,
Preprint 6199.
Abstract
H. Purnhagen,
“Low complexity parametric stereo coding in MPEG-4,”
in Proc. Digital Audio Effects Workshop (DAFX), Naples, IT,
Oct. 2004, pp. 163-168.
Abstract
Paper
E. Schuijers, J. Breebaart, H. Purnhagen, and J. Engdegård,
“Low complexity parametric stereo coding,”
in AES 116th Convention, Berlin, DE, May 2004,
Preprint 6073.
Abstract
J. Engdegård, H. Purnhagen, J. Rödén, and L. Liljeryd,
“Synthetic ambience in parametric stereo coding,”
in AES 116th Convention, Berlin, DE, May 2004.
Abstract
M. Wolters, K. Kjörling, D. Homm, and H. Purnhagen,
“A closer look into MPEG-4 High Efficiency AAC,”
in AES 115th Convention, New York, NY, US, Oct. 2003,
Preprint 5871.
Abstract
H. Purnhagen,
“Parameter estimation and tracking for time-varying sinusoids,”
in Proc. 1st IEEE Benelux Workshop on Model based Processing and
Coding of Audio (MPCA-2002), Leuven, BE, Nov. 2002, pp. 5-8.
Paper
N. Meine and H. Purnhagen,
“Fast sinusoid synthesis for MPEG-4 HILN parametric audio
decoding,”
in Proc. Digital Audio Effects Workshop (DAFX), Hamburg, DE,
Sept. 2002.
Paper
H. Purnhagen, N. Meine, and B. Edler,
“Sinusoidal coding using loudness-based component selection,”
in Proc. IEEE Int. Conf. Acoustics, Speech, Signal Processing
(ICASSP), Orlando, FL, US, May 2002, pp. II-1817 - II-1820.
Abstract
H. Purnhagen, B. Edler, and N. Meine,
“Error protection and concealment for HILN MPEG-4 parametric audio
coding,”
in AES 110th Convention, Amsterdam, NL, May 2001,
Preprint 5300.
Abstract
H. Purnhagen, N. Meine, and B. Edler,
“Speeding up HILN - MPEG-4 parametric audio encoding with
reduced complexity,”
in AES 109th Convention, Los Angeles, CA, US, Sept. 2000,
Preprint 5177.
Abstract
B. Edler and H. Purnhagen,
“Parametric audio coding,”
in Proc. International Conference on Signal Processing (ICSP2000), Beijing, CN, Aug. 2000.
Abstract
H. Purnhagen and N. Meine,
“HILN - the MPEG-4 parametric audio coding tools,”
in Proc. IEEE Int. Symposium on Circuits and Systems (ISCAS),
Geneva, CH, May 2000, pp. III-201 - III-204.
Abstract
H. Purnhagen,
“Advances in parametric audio coding,”
in Proc. IEEE Workshop on Applications of Signal Processing to
Audio and Acoustics (WASPAA), Mohonk, New Paltz, NY, US, Oct. 1999, pp.
31-34.
Abstract
H. Purnhagen,
“An overview of MPEG-4 audio version 2,”
in Proc. AES 17th Int. Conf. (High-Quality Audio Coding),
Florence, IT, Sept. 1999, pp. 157-168.
Abstract
B. Edler and H. Purnhagen,
“Concepts for hybrid audio coding schemes based on parametric
techniques,”
in AES 105th Convention, San Francisco, CA, US, Sept. 1998,
Preprint 4808.
Abstract
H. Purnhagen, B. Edler, and C. Ferekidis,
“Object-based analysis/synthesis audio coder for very low bit
rates,”
in AES 104th Convention, Amsterdam, NL, May 1998,
Preprint 4747.
Abstract
H. Purnhagen and B. Edler,
“Objektbasierter Analyse/Synthese Audio Coder für sehr niedrige
Datenraten,”
in ITG-Fachtagung 'Codierung für Quelle, Kanal und
Übertragung', Aachen, DE, Mar. 1998, pp. 35-40.
Info
B. Edler, H. Purnhagen, and C. Ferekidis,
“ASAC - analysis/synthesis audio codec for very low bit rates,”
in AES 100th Convention, Copenhagen, DK, May 1996,
Preprint 4179.
Abstract
T. Svendsen, F. K. Soong, and H. Purnhagen,
“Optimizing baseforms for HMM-based speech recognition,”
Proc. EUROSPEECH, Sept. 1995.
Abstract
H. Purnhagen,
Audio Coding - Overview and Latest Developments in MPEG-4,
presented at Medieteknikdagarna Norrköping, SE, April 1, 2004.
Info
Abstract
H. Purnhagen,
Parametric Audio Coding in MPEG-4,
presented at NTNU, Trondheim, NO, April 25, 2001.
Abstract
Slides
H. Purnhagen,
Parametrische Audiocodierung in MPEG-4,
präsentiert im Rahmen der Vortragsreihe 'Media Event' an der TU
Ilmenau, Ilmenau, DE, Dezember 12, 2000.
Abstract
Slides
H. Purnhagen, and B. Edler,
Perceptual Audio Coders - What to listen for: Artifacts of Parametric Coding,
presented at Workshop W9 "Perceptual Audio Coders - What to listen for", 109th AES Convention, Los Angeles, Sept. 2000,
revised version presented at Workshop W4 "Listening to Perceptual Audio Coders", 112th AES Convention, Munich, May 2002.
Abstract
Slides
B. Edler, and H. Purnhagen,
Perceptual Audio Coders - What to listen for: Speech Codecs and Music,
presented at Workshop W9 "Perceptual Audio Coders - What to listen for", 109th AES Convention, Los Angeles, Sept. 2000,
revised version presented at Workshop W4 "Listening to Perceptual Audio Coders", 112th AES Convention, Munich, May 2002.
Abstract
Slides
H. Purnhagen,
MPEG-4 Version 2 Audio Workshop: HILN - Parametric Audio Coding,
presented at Workshop W3 "MPEG-4 Version 2 Audio What is it about?", 108th AES Convention, Paris, February 2000.
Abstract
Slides
H. Purnhagen,
Überblick über MPEG-4 Audio Version 2,
präsentiert auf der ITG-Diskussionssitzung "Stand der Audiocodierung heute", Institut für Rundfunktechnik, München, November 1999.
Abstract
Slides
H. Purnhagen,
Parametrische Audiocodierung bei sehr niedrigen Datenraten,
präsentiert auf der ITG-Diskussionssitzung "Stand der Audiocodierung heute", Institut für Rundfunktechnik, München, November 1999.
Abstract
Slides
Editor or co-editor of several parts of MPEG
standards, including ISO/IEC 14496-3 (MPEG-4 Audio) and ISO/IEC
23003-1 (MPEG Surround).
H. Purnhagen and B. Edler,
“Speech Coding Artifacts,”
in Perceptual Audio Coders: What to Listen For, AES Tutorial CD-ROM, 2001.
Info
N. Meine and H. Purnhagen,
Vorrichtung zur Codierung/Decodierung,
Patent DE19914645, 1999.
Abstract
H. Purnhagen,
Some mathematics behind multi-channel prediction,
Internal Technical Memo, Universität Hannover, Institut für Theoretische
Nachrichtentechnik und Informationsverarbeitung, Sept. 1994.
Abstract
Paper
H. Purnhagen,
N-best search methods applied to speech recognition,
Diploma thesis (Diplomarbeit), Universitetet i Trondheim, Norges Tekniske Høgskole, Institutt for Teleteknikk, May 1994.
Abstract
Thesis
H. Purnhagen,
Implementation und Untersuchung eines Verfahrens zur Reduktion der
Stereo-Redundanz bei der Codierung von Audiosignalen,
Thesis (Studienarbeit), Universität Hannover, Institut für Theoretische Nachrichtentechnik und Informationsverarbeitung, Dec. 1992.
Abstract
H. Purnhagen,
Digitaler Synthesizer II,
Wettbewerbsbeitrag (Technik), Jugend Forscht, 1987.
Jugend Forscht
H. Purnhagen,
Digitaler Synthesizer,
Wettbewerbsbeitrag (Technik), Jugend Forscht, 1986.
Jugend Forscht
H. Purnhagen,
“ELO-Computing: 1-Bit-Spracherkennung (2)”,
in ELO - Das Magazin für Elektronik und Computer,
7/1986, Seite 60-62, Franzis-Verlag München, Juli 1986.
H. Purnhagen, B. Eder,
“ELO-Computing: 1-Bit-Spracherkennung (1)”,
in ELO - Das Magazin für Elektronik und Computer,
6/1986, Seite 40-43, Franzis-Verlag München, Juni 1986.
H. Purnhagen,
1-Bit-Spracherkennung,
Wettbewerbsbeitrag (Technik), Jugend Forscht, 1985.
Jugend Forscht
H. Purnhagen,
“Jugend forscht: Spektrometer im Selbstbau”,
in LC - Lehrmittel Computer (Zeitschrift für die Schulpraxis und Weiterbildung), 2.85, Seite 29-31, Westermann, Mai 1985.
H. Purnhagen,
Spektrometer mit Microcomputersteuerung und -Auswertung,
Wettbewerbsbeitrag (Physik), Jugend Forscht, 1984.
Jugend Forscht
H. Purnhagen,
Bau eines Ultraschall-Radargerätes mit zweidimensionaler Echodarstellung auf einem Computerbildschirm,
Wettbewerbsbeitrag (Physik), Jugend Forscht, 1983.
Jugend Forscht
H. Purnhagen,
Bau eines Plotters aus Fischer-Technik und Erstellung von Demonstrationsprogrammen in Basic für den Betrieb des Plotter,
Wettbewerbsbeitrag (Technik), Jugend Forscht, 1982.
Jugend Forscht
H. Purnhagen,
Glücksspielautomat mit Münzprüfer und Gewinnausgabe,
Wettbewerbsbeitrag (Technik), Jugend Forscht, 1981.
Jugend Forscht
H. Purnhagen,
Erarbeitung von Gewinnstrategien für das Spiel "Mühle",
Wettbewerbsbeitrag (Mathematik/Informatik), Jugend Forscht, 1980.
Jugend Forscht
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