• H.G. Hirsch, A. Kitzig: Robust Speech Recognition by Combining a Robust Feature Extraction with an Adaptation of HMMs, 9. ITG Fachtagung Sprachkommunikation, Oktober 2010

• H.G. Hirsch, A. Kitzig, K. Linhard: Simulation of the Hands-free Speech Input to Speech Recognition Systems by Measuring the Room Impulse Responses, 9. ITG Fachtagung Sprachkommunikation, Oktober 2010

• H.G. Hirsch, A. Kitzig: Improving the Robustness with Multiple Sets of HMMs, Interspeech conference, S. 564-567, Brighton, Great Britain, September 2009

• H.G. Hirsch, A. Kitzig: Visualisierung der in einem HMM enthaltenen spektralen Merkmale, 8. ITG Fachtagung Sprachkommunikation, Aachen, Oktober 2008

• H.G. Hirsch, P. Pogscheba: Verbesserung der Spracherkennung bei Freisprechen durch eine robuste Merkmalsextraktion und eine Adaption der Referenzmuster, 8. ITG Fachtagung Sprachkommunikation, Aachen, Oktober 2008

• H. Wang, D. Gelbart, H.G. Hirsch, W. Hemmert: The Value of Auditory Offset Compensation and Appropriate Acoustic Modeling, Interspeech conference, Brisbane, Australien, September 2008

• H.G. Hirsch: Automatic Speech Recognition in Adverse Acoustic Conditions, Buch in der Schriftenreihe des Fachbereichs Elektrotechnik und Informatik, Hochschule Niederrhein, Shaker Verlag, ISBN 978-3-8322-7226-5, Mai 2008

• H.G. Hirsch, H. Finster: A New Approach for the Adaptation of HMMs to Reverberation and Background Noise, Speech Communication, Vol.50, S. 244-263, März 2008

• H.G. Hirsch: Automatic Speech Recognition in Adverse Acoustic Conditions, Kapitel des Buchs Advances in Digital Speech Transmission, Herausgeber: R. Martin, U. Heute, C. Antweiler, Verlag John Wiley & Sons, S. 461-496, Januar 2008

• H.G. Hirsch, H. Finster; A New HMM Adaptation Approach for the Case of a Hands-free Speech Input in Reverberant Rooms, Interspeech conference, S. 2697-2700, Pittsburgh, USA, 2006

• H.G. Hirsch, H. Finster: The Simulation of Realistic Acoustic Input Scenarios for Speech Recognition Systems, 9th European Conference on Speech Communication and Technology - Interspeech'05, Lisboa, Portugal, September 2005

• H.G. Hirsch, H. Finster: Applying the Aurora Feature Extraction Schemes to a Phoneme Based Recognition Task, 8th International Conference on Spoken Language Processing - ICSLP'04, Jeju Island, Korea, October 2004

• H.G. Hirsch: Realisierung eines Sprachdialogsystems mit einer robusten Spracherkennung, 15. Tagung Elektronische Sprachsignalverarbeitung, Cottbus, September 2004

• H.G. Hirsch, H. Finster: Bestimmung der optimalen HMM Parameter zur robusten phonembasierten Spracherkennung, 15. Tagung Elektronische Sprachsignalverarbeitung, Cottbus, September 2004

• N. Parihar, J. Picone, D. Pearce, H.G. Hirsch: Performance Analysis of the Aurora Large Vocabulary System, 12th European Signal Processing Conference - EUSIPCO'04, Vienna, Austria, September 2004

• H.G. Hirsch: The Influence of Speech Coding on Recognition Performance in Telecommunication Networks, 7th International Conference on Spoken Language Processing - ICSLP'02,Denver, USA, September 2002

• H.G. Hirsch: HMM Adaptation for Applications in Telecommunication, Speech Communication 34, 2001, pp. 127-139

• H.G. Hirsch, K. Hellwig, S. Dobler: Speech Recognition at Multiple Sampling Rates, 7th European Conference on Speech Communication and Technology - Eurospeech'01, Aalborg, Denmark, September 2001

• H.G. Hirsch, D. Pearce: The Aurora Experimental Framework for the Performance Evaluation of Speech Recognition Systems under Noisy Conditions, 6th International Conference on Spoken Language Processing - ICSLP'00, Beijing, China, October 2000

• H.G. Hirsch, D. Pearce: The Aurora Experimental Framework for the Performance Evaluation of Speech Recognition Systems under Noisy Conditions, ISCA Workshop on Automatic Speech Recognition: "Challenges for the Next Millenium", Paris, France, September 2000

• H.G. Hirsch: HMM Adaptation for Telephone Applications, 6th European Conference on Speech Communication and Technology - Eurospeech'99 Budapest, Hungary, September 1999

• H.G. Hirsch, C. Ehrlicher: Noise Estimation Techniques for Robust Speech Recognition, International Conference on Acoustics, Speech and Signal Processing, Detroit, USA, 1995

• H.G. Hirsch: Intelligibility Improvement of Noisy Speech for People with Cochlear Implants, Speech Communication, Vol. 12, 1993

• H.G. Hirsch, P. Meyer, H.W. Rühl: Improved Speech Recognition Using High-pass Filtering of Subband Envelopes, 2nd European Conference on Speech Communication and Technology - Eurospeech'91, Genua, Italy, 1991

• H.G. Hirsch, H. Finster: GUI based course on Digital Signal Processing in the field of Communications Technology, International DSP conference, organized by The Mathworks, Stuttgart, May 2003

• H.G. Hirsch: Digitale Signalverarbeitung sehen, hören und verstehen, Vortrag im Rahmen der Vortragsreihe an der HS Niederrhein, Krefeld, Okt. 2003

• H.G. Hirsch: Verfahren zur robusten, automatischen Spracherkennung, Vortrag an der Ruhr-Universität Bochum, Bochum, Jan. 2004

• H.G. Hirsch, H. Finster: Automatische Spracherkennung in Theorie und Praxis Vortrag im Rahmen der Vortragsreihe an der HS Niederrhein, Krefeld, Apr. 2004

• H.G. Hirsch: Realisierung eines Sprachdialogsystems mit einer robusten Spracherkennung, 15. Tagung Elektronische Sprachsignalverarbeitung, Cottbus, September 2004