Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Friedhelm R. Drepper"'
Given the problems of the environment in relation to the ever-growing civi lization activities of man, it is not surprising that in recent years more and more related data have been collected, phenomena have been observed and concerns have been exp
Publikováno v:
Ecological Modelling. 144:261-277
Time series of algae mass in German water reservoir lakes being collected for several years in irregular sampling, half weekly on average, are tested in their stationary distribution against several univariate stochastic processes with linear and non
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::864dca0e4f41a13c9617ce4fe126d9db
https://doi.org/10.1016/s0304-3800(01)00377-5
https://doi.org/10.1016/s0304-3800(01)00377-5
Autor:
Ralf Krampe, Michael Schiek, Friedhelm R. Drepper, Reinhold Kliegl, Christian Scheffczyk, Ralf Engbert, Jürgen Kurths
Publikováno v:
Scopus-Elsevier
Key words: Nonlinear time series analysis, symbolic dynamics, phase transitions, physiological data, biological synchronization, production of polyrhythms, cardiorespiratory interaction, variation of control parameter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c9f62f5b751816e65d68e08d1d988fa
https://doi.org/10.1016/s0362-546x(96)00137-x
https://doi.org/10.1016/s0362-546x(96)00137-x
Publikováno v:
SSP
A part-tone decomposition of voiced sections of speech is introduced, which is adapted with high accuracy to the frequency of the glottal oscillator of the speaker. The iterative replacement of the center filter frequency contours (chosen locally as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::335a0a359d2e50cb8166847a65b3dfda
https://doi.org/10.1109/ssp.2012.6319705
https://doi.org/10.1109/ssp.2012.6319705
Autor:
Ralf Engbert, Friedhelm R. Drepper
Publikováno v:
Chaos, Solitons & Fractals. 4:1147-1169
In spite of their complex behaviour the dynamics of some ecological systems may be explained by deterministic laws of motion. This is clearly theoretically possible, because deductive approaches to the dynamics of ecological systems lead to nonlinear
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad7e0bb797de6a709ae5811c4d9b30cb
https://doi.org/10.1016/0960-0779(94)90028-0
https://doi.org/10.1016/0960-0779(94)90028-0
Publikováno v:
ICASSP
In current speech recognition systems mainly Short-Time Fourier Transform based features like MFCC are applied. Dropping the short-time stationarity assumption of the voiced speech, this paper introduces the non-stationary signal analysis into the AS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7e6bf1a5f729adcc99e863343eb6762
https://doi.org/10.1109/icassp.2011.5947530
https://doi.org/10.1109/icassp.2011.5947530
Autor:
Friedhelm R. Drepper, Bengt Månsson
Publikováno v:
Ecological Economics. 7:43-67
The inherent unpredictability of ecological systems is a vital feature for the development of theories at the interface between economics and ecology. Such unpredictability is caused by instabilities that are intrinsic parts of ecosystem function, su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfc77af68ed859050151d01083e26db0
https://doi.org/10.1016/0921-8009(93)90019-3
https://doi.org/10.1016/0921-8009(93)90019-3
Autor:
Friedhelm R. Drepper
Publikováno v:
Advances in Nonlinear Speech Processing ISBN: 9783540773467
NOLISP
NOLISP
To account for the strong non-stationarity of voiced speech and its nonlinear aero-acoustic origin, the classical source-filter model is extended to a cascaded drive-response model with a conventional linear secondary response, a synchronized and/or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c79f8115038abf989ec7294e0eda1bd0
https://doi.org/10.1007/978-3-540-77347-4_16
https://doi.org/10.1007/978-3-540-77347-4_16
Autor:
Friedhelm R. Drepper
Publikováno v:
Speech Communication
Speech Communication, Elsevier : North-Holland, 2007, 49 (3), pp.186. ⟨10.1016/j.specom.2007.01.004⟩
Speech Communication, Elsevier : North-Holland, 2007, 49 (3), pp.186. ⟨10.1016/j.specom.2007.01.004⟩
Voiced segments of speech are assumed to be composed of non-stationary acoustic objects which can be described as stationary response of a non-stationary fundamental drive (FD) process and which are furthermore suited to reconstruct the hidden FD by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c30966c0ba2ffdfde20d5d6320d4e7fd
https://hal.archives-ouvertes.fr/hal-00499167/file/PEER_stage2_10.1016%2Fj.specom.2007.01.004.pdf
https://hal.archives-ouvertes.fr/hal-00499167/file/PEER_stage2_10.1016%2Fj.specom.2007.01.004.pdf
Autor:
Friedhelm R. Drepper
Publikováno v:
Nonlinear Analyses and Algorithms for Speech Processing ISBN: 9783540312574
NOLISP
NOLISP
The transmission protocol of voiced speech is hypothesized to be based on a funda mental drive process, which synchronizes the vocal tract excitation on the trans mitter side and evokes the pitch perception on the receiver side. A band limited fundam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bdf2d37497d0fc0a288bd04633ee12e
https://doi.org/10.1007/11613107_11
https://doi.org/10.1007/11613107_11