---
_id: '11939'
abstract:
- lang: eng
  text: In this paper a switching linear dynamical model (SLDM) approach for speech
    feature enhancement is improved by employing more accurate models for the dynamics
    of speech and noise. The model of the clean speech feature trajectory is improved
    by augmenting the state vector to capture information derived from the delta features.
    Further a hidden noise state variable is introduced to obtain a more elaborated
    model for the noise dynamics. Approximate Bayesian inference in the SLDM is carried
    out by a bank of extended Kalman filters, whose outputs are combined according
    to the a posteriori probability of the individual state models. Experimental results
    on the AURORA2 database show improved recognition accuracy.
author:
- first_name: Stefan
  full_name: Windmann, Stefan
  last_name: Windmann
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Windmann S, Haeb-Umbach R. Modeling the dynamics of speech and noise for speech
    feature enhancement in ASR. In: <i>IEEE International Conference on Acoustics,
    Speech and Signal Processing (ICASSP 2008)</i>. ; 2008:4409-4412. doi:<a href="https://doi.org/10.1109/ICASSP.2008.4518633">10.1109/ICASSP.2008.4518633</a>'
  apa: Windmann, S., &#38; Haeb-Umbach, R. (2008). Modeling the dynamics of speech
    and noise for speech feature enhancement in ASR. In <i>IEEE International Conference
    on Acoustics, Speech and Signal Processing (ICASSP 2008)</i> (pp. 4409–4412).
    <a href="https://doi.org/10.1109/ICASSP.2008.4518633">https://doi.org/10.1109/ICASSP.2008.4518633</a>
  bibtex: '@inproceedings{Windmann_Haeb-Umbach_2008, title={Modeling the dynamics
    of speech and noise for speech feature enhancement in ASR}, DOI={<a href="https://doi.org/10.1109/ICASSP.2008.4518633">10.1109/ICASSP.2008.4518633</a>},
    booktitle={IEEE International Conference on Acoustics, Speech and Signal Processing
    (ICASSP 2008)}, author={Windmann, Stefan and Haeb-Umbach, Reinhold}, year={2008},
    pages={4409–4412} }'
  chicago: Windmann, Stefan, and Reinhold Haeb-Umbach. “Modeling the Dynamics of Speech
    and Noise for Speech Feature Enhancement in ASR.” In <i>IEEE International Conference
    on Acoustics, Speech and Signal Processing (ICASSP 2008)</i>, 4409–12, 2008. <a
    href="https://doi.org/10.1109/ICASSP.2008.4518633">https://doi.org/10.1109/ICASSP.2008.4518633</a>.
  ieee: S. Windmann and R. Haeb-Umbach, “Modeling the dynamics of speech and noise
    for speech feature enhancement in ASR,” in <i>IEEE International Conference on
    Acoustics, Speech and Signal Processing (ICASSP 2008)</i>, 2008, pp. 4409–4412.
  mla: Windmann, Stefan, and Reinhold Haeb-Umbach. “Modeling the Dynamics of Speech
    and Noise for Speech Feature Enhancement in ASR.” <i>IEEE International Conference
    on Acoustics, Speech and Signal Processing (ICASSP 2008)</i>, 2008, pp. 4409–12,
    doi:<a href="https://doi.org/10.1109/ICASSP.2008.4518633">10.1109/ICASSP.2008.4518633</a>.
  short: 'S. Windmann, R. Haeb-Umbach, in: IEEE International Conference on Acoustics,
    Speech and Signal Processing (ICASSP 2008), 2008, pp. 4409–4412.'
date_created: 2019-07-12T05:31:11Z
date_updated: 2022-01-06T06:51:12Z
department:
- _id: '54'
doi: 10.1109/ICASSP.2008.4518633
keyword:
- a posteriori probability
- AURORA2 database
- Bayesian inference
- Bayes methods
- channel bank filters
- extended Kalman filter banks
- hidden noise state variable
- Kalman filters
- noise dynamics
- speech enhancement
- speech feature enhancement
- speech feature trajectory
- switching linear dynamical model approach
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2008/WiHa08-1.pdf
oa: '1'
page: 4409-4412
publication: IEEE International Conference on Acoustics, Speech and Signal Processing
  (ICASSP 2008)
status: public
title: Modeling the dynamics of speech and noise for speech feature enhancement in
  ASR
type: conference
user_id: '44006'
year: '2008'
...
---
_id: '64041'
abstract:
- lang: eng
  text: Three cis-dioxovanadium(V) complexes with similar N -salicylidenehydrazide
    ligands modeling hydrogen bonding interactions of vanadate relevant for vanadium
    haloperoxidases are studied by 51V solid-state NMR spectroscopy. Their parameters
    describing the quadrupolar and chemical shift anisotropy interactions (quadrupolar
    coupling constant C Q , asymmetry of the quadrupolar tensor η Q , isotropic chemical
    shift δ iso , chemical shift anisotropy δ σ , asymmetry of the chemical shift
    tensor η σ and the Euler angles α , β and γ ) are determined both experimentally
    and theoretically using DFT methods. A comparative study of different methods
    to determine the NMR parameters by numerical simulation of the spectra is presented.
    Detailed theoretical investigations on the DFT level using various basis sets
    and structural models show that by useful choice of the methodology, the calculated
    parameters agree to the experimental ones in a very good manner.
author:
- first_name: Annika
  full_name: Schweitzer, Annika
  last_name: Schweitzer
- first_name: Torsten
  full_name: Gutmann, Torsten
  id: '118165'
  last_name: Gutmann
- first_name: Maria
  full_name: Wächtler, Maria
  last_name: Wächtler
- first_name: Hergen
  full_name: Breitzke, Hergen
  last_name: Breitzke
- first_name: Axel
  full_name: Buchholz, Axel
  last_name: Buchholz
- first_name: Winfried
  full_name: Plass, Winfried
  last_name: Plass
- first_name: Gerd
  full_name: Buntkowsky, Gerd
  last_name: Buntkowsky
citation:
  ama: Schweitzer A, Gutmann T, Wächtler M, et al. 51V solid-state NMR investigations
    and DFT studies of model compounds for vanadium haloperoxidases. <i>Solid State
    Nuclear Magnetic Resonance</i>. 2008;34(1–2):52–67. doi:<a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">10.1016/j.ssnmr.2008.02.003</a>
  apa: Schweitzer, A., Gutmann, T., Wächtler, M., Breitzke, H., Buchholz, A., Plass,
    W., &#38; Buntkowsky, G. (2008). 51V solid-state NMR investigations and DFT studies
    of model compounds for vanadium haloperoxidases. <i>Solid State Nuclear Magnetic
    Resonance</i>, <i>34</i>(1–2), 52–67. <a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">https://doi.org/10.1016/j.ssnmr.2008.02.003</a>
  bibtex: '@article{Schweitzer_Gutmann_Wächtler_Breitzke_Buchholz_Plass_Buntkowsky_2008,
    title={51V solid-state NMR investigations and DFT studies of model compounds for
    vanadium haloperoxidases}, volume={34}, DOI={<a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">10.1016/j.ssnmr.2008.02.003</a>},
    number={1–2}, journal={Solid State Nuclear Magnetic Resonance}, author={Schweitzer,
    Annika and Gutmann, Torsten and Wächtler, Maria and Breitzke, Hergen and Buchholz,
    Axel and Plass, Winfried and Buntkowsky, Gerd}, year={2008}, pages={52–67} }'
  chicago: 'Schweitzer, Annika, Torsten Gutmann, Maria Wächtler, Hergen Breitzke,
    Axel Buchholz, Winfried Plass, and Gerd Buntkowsky. “51V Solid-State NMR Investigations
    and DFT Studies of Model Compounds for Vanadium Haloperoxidases.” <i>Solid State
    Nuclear Magnetic Resonance</i> 34, no. 1–2 (2008): 52–67. <a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">https://doi.org/10.1016/j.ssnmr.2008.02.003</a>.'
  ieee: 'A. Schweitzer <i>et al.</i>, “51V solid-state NMR investigations and DFT
    studies of model compounds for vanadium haloperoxidases,” <i>Solid State Nuclear
    Magnetic Resonance</i>, vol. 34, no. 1–2, pp. 52–67, 2008, doi: <a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">10.1016/j.ssnmr.2008.02.003</a>.'
  mla: Schweitzer, Annika, et al. “51V Solid-State NMR Investigations and DFT Studies
    of Model Compounds for Vanadium Haloperoxidases.” <i>Solid State Nuclear Magnetic
    Resonance</i>, vol. 34, no. 1–2, 2008, pp. 52–67, doi:<a href="https://doi.org/10.1016/j.ssnmr.2008.02.003">10.1016/j.ssnmr.2008.02.003</a>.
  short: A. Schweitzer, T. Gutmann, M. Wächtler, H. Breitzke, A. Buchholz, W. Plass,
    G. Buntkowsky, Solid State Nuclear Magnetic Resonance 34 (2008) 52–67.
date_created: 2026-02-07T16:10:01Z
date_updated: 2026-02-17T16:13:21Z
doi: 10.1016/j.ssnmr.2008.02.003
extern: '1'
intvolume: '        34'
issue: 1–2
keyword:
- 51V NMR
- Model system
- Ab initio calculation
- Cis-dioxovanadium(V) complex
- Haloperoxidase
- Numerical optimization
- Quadrupolar interaction
language:
- iso: eng
page: 52–67
publication: Solid State Nuclear Magnetic Resonance
status: public
title: 51V solid-state NMR investigations and DFT studies of model compounds for vanadium
  haloperoxidases
type: journal_article
user_id: '100715'
volume: 34
year: '2008'
...
---
_id: '11943'
abstract:
- lang: eng
  text: A marginalized particle filter is proposed for performing single channel speech
    enhancement with a non-linear dynamic state model. The system consists of a particle
    filter for tracking line spectral pair (LSP) parameters and a Kalman filter per
    particle for speech enhancement. The state model for the LSPs has been learnt
    on clean speech training data. In our approach parameters and speech samples are
    processed at different time scales by assuming the parameters to be constant for
    small blocks of data. Further enhancement is obtained by an iteration which can
    be applied on these small blocks. The experiments show that similar SNR gains
    are obtained as with the Kalman-LM-iterative algorithm. However better values
    of the noise level and the log-spectral distance are achieved
author:
- first_name: Stefan
  full_name: Windmann, Stefan
  last_name: Windmann
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Windmann S, Haeb-Umbach R. Iterative Speech Enhancement using a Non-Linear
    Dynamic State Model of Speech and its Parameters. In: <i>IEEE International Conference
    on Acoustics, Speech and Signal Processing (ICASSP 2006)</i>. Vol 1. ; 2006:I.
    doi:<a href="https://doi.org/10.1109/ICASSP.2006.1660058">10.1109/ICASSP.2006.1660058</a>'
  apa: Windmann, S., &#38; Haeb-Umbach, R. (2006). Iterative Speech Enhancement using
    a Non-Linear Dynamic State Model of Speech and its Parameters. In <i>IEEE International
    Conference on Acoustics, Speech and Signal Processing (ICASSP 2006)</i> (Vol.
    1, p. I). <a href="https://doi.org/10.1109/ICASSP.2006.1660058">https://doi.org/10.1109/ICASSP.2006.1660058</a>
  bibtex: '@inproceedings{Windmann_Haeb-Umbach_2006, title={Iterative Speech Enhancement
    using a Non-Linear Dynamic State Model of Speech and its Parameters}, volume={1},
    DOI={<a href="https://doi.org/10.1109/ICASSP.2006.1660058">10.1109/ICASSP.2006.1660058</a>},
    booktitle={IEEE International Conference on Acoustics, Speech and Signal Processing
    (ICASSP 2006)}, author={Windmann, Stefan and Haeb-Umbach, Reinhold}, year={2006},
    pages={I} }'
  chicago: Windmann, Stefan, and Reinhold Haeb-Umbach. “Iterative Speech Enhancement
    Using a Non-Linear Dynamic State Model of Speech and Its Parameters.” In <i>IEEE
    International Conference on Acoustics, Speech and Signal Processing (ICASSP 2006)</i>,
    1:I, 2006. <a href="https://doi.org/10.1109/ICASSP.2006.1660058">https://doi.org/10.1109/ICASSP.2006.1660058</a>.
  ieee: S. Windmann and R. Haeb-Umbach, “Iterative Speech Enhancement using a Non-Linear
    Dynamic State Model of Speech and its Parameters,” in <i>IEEE International Conference
    on Acoustics, Speech and Signal Processing (ICASSP 2006)</i>, 2006, vol. 1, p.
    I.
  mla: Windmann, Stefan, and Reinhold Haeb-Umbach. “Iterative Speech Enhancement Using
    a Non-Linear Dynamic State Model of Speech and Its Parameters.” <i>IEEE International
    Conference on Acoustics, Speech and Signal Processing (ICASSP 2006)</i>, vol.
    1, 2006, p. I, doi:<a href="https://doi.org/10.1109/ICASSP.2006.1660058">10.1109/ICASSP.2006.1660058</a>.
  short: 'S. Windmann, R. Haeb-Umbach, in: IEEE International Conference on Acoustics,
    Speech and Signal Processing (ICASSP 2006), 2006, p. I.'
date_created: 2019-07-12T05:31:15Z
date_updated: 2022-01-06T06:51:12Z
department:
- _id: '54'
doi: 10.1109/ICASSP.2006.1660058
intvolume: '         1'
keyword:
- clean speech training data
- iterative methods
- iterative speech enhancement
- Kalman filter
- Kalman filters
- Kalman-LM-iterative algorithm
- line spectral pair parameters
- log-spectral distance
- marginalized particle filter
- noise level
- nonlinear dynamic state speech model
- particle filtering (numerical methods)
- single channel speech enhancement
- SNR gains
- speech enhancement
- speech samples
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://groups.uni-paderborn.de/nt/pubs/2006/WiHa06-2.pdf
oa: '1'
page: I
publication: IEEE International Conference on Acoustics, Speech and Signal Processing
  (ICASSP 2006)
status: public
title: Iterative Speech Enhancement using a Non-Linear Dynamic State Model of Speech
  and its Parameters
type: conference
user_id: '44006'
volume: 1
year: '2006'
...
---
_id: '39352'
abstract:
- lang: eng
  text: The recently adopted OCL 2.0 specification comes with a formal semantics that
    is based on set theory with a notion of an object model and system states. System
    states keep the runtime information relevant for the evaluation of OCL expressions.
    However, not all new language concepts of OCL 2.0 are already addressed in that
    formal semantics. We show how to overcome this by introducing new components to
    the object model and system states defining a dynamic semantics of OCL. In order
    to give precise rules that determine when the current system state has to be updated
    according to a change in the referred UML model, we make use of adequate mathematical
    means, namely Abstract State Machines (ASMs). Though our ASM specification also
    gives a clear definition for the evaluation of OCL constraints, it leaves sufficient
    flexibility for application specific implementations that have to determine when
    constraints are to be checked.
author:
- first_name: Stephan
  full_name: Flake, Stephan
  last_name: Flake
- first_name: Wolfgang
  full_name: Müller, Wolfgang
  last_name: Müller
citation:
  ama: 'Flake S, Müller W. An ASM Definition of the Dynamic OCL 2.0 Semantics. In:
    <i>Proceedings of the UML 2004</i>. ; 2004. doi:<a href="https://doi.org/10.1007/978-3-540-30187-5_17">10.1007/978-3-540-30187-5_17</a>'
  apa: Flake, S., &#38; Müller, W. (2004). An ASM Definition of the Dynamic OCL 2.0
    Semantics. <i>Proceedings of the UML 2004</i>. <a href="https://doi.org/10.1007/978-3-540-30187-5_17">https://doi.org/10.1007/978-3-540-30187-5_17</a>
  bibtex: '@inproceedings{Flake_Müller_2004, place={Lisbon, Portugal}, title={An ASM
    Definition of the Dynamic OCL 2.0 Semantics}, DOI={<a href="https://doi.org/10.1007/978-3-540-30187-5_17">10.1007/978-3-540-30187-5_17</a>},
    booktitle={Proceedings of the UML 2004}, author={Flake, Stephan and Müller, Wolfgang},
    year={2004} }'
  chicago: Flake, Stephan, and Wolfgang Müller. “An ASM Definition of the Dynamic
    OCL 2.0 Semantics.” In <i>Proceedings of the UML 2004</i>. Lisbon, Portugal, 2004.
    <a href="https://doi.org/10.1007/978-3-540-30187-5_17">https://doi.org/10.1007/978-3-540-30187-5_17</a>.
  ieee: 'S. Flake and W. Müller, “An ASM Definition of the Dynamic OCL 2.0 Semantics,”
    2004, doi: <a href="https://doi.org/10.1007/978-3-540-30187-5_17">10.1007/978-3-540-30187-5_17</a>.'
  mla: Flake, Stephan, and Wolfgang Müller. “An ASM Definition of the Dynamic OCL
    2.0 Semantics.” <i>Proceedings of the UML 2004</i>, 2004, doi:<a href="https://doi.org/10.1007/978-3-540-30187-5_17">10.1007/978-3-540-30187-5_17</a>.
  short: 'S. Flake, W. Müller, in: Proceedings of the UML 2004, Lisbon, Portugal,
    2004.'
date_created: 2023-01-24T09:28:53Z
date_updated: 2023-01-24T09:28:58Z
department:
- _id: '672'
doi: 10.1007/978-3-540-30187-5_17
keyword:
- System State     Formal Semantic     Object Management Group     Denotational Semantic     Dynamic
  Semantic
language:
- iso: eng
place: Lisbon, Portugal
publication: Proceedings of the UML 2004
publication_identifier:
  eisbn:
  - 978-3-540-30187-5
status: public
title: An ASM Definition of the Dynamic OCL 2.0 Semantics
type: conference
user_id: '5786'
year: '2004'
...