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Continuous frequency and phase spectrograms: a study of their 2D and 3D capabilities and application to musical signal analysis

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 199-206页

作者： laurent navarro Guy COURBEBAISSE Jean-Charles PINOLI Ecole Nationale Supérieure des Mines de Saint-Etienne Centre Ingénierie et Santé (CIS) and LPMG UMR 5148 CNRS 158 cours Fauriel 42023 Saint-Etienne cedex 2 France Medical Imaging Research Center (CREATIS-LRMN) UMR 5220 CNRS U630 INSERM Université Lyon 1 INSA Lyon Bat. Blaise Pascal 7 Av. Jean Capelle 69621 Villeurbanne France

A new lighting and enlargement on phase spectrogram （PS） and frequency spectrogram （FS） is presented in this paper. These representations result from the coupling of power spectrogram and short time Fourier transform （STFT）. The main contribution is the construction of the 3D phase spectrogram （3DPS） and the 3D frequency spectrogram （3DFS）. These new tools allow such specific test signals as small slope linear chirp, phase jump case of musical signal analysis is reported. The main objective is to and small frequency jump to be analyzed. An application detect small frequency and phase variations in order to characterize each type of sound attack without losing the amplitude information given by power spectrogram

关键词： Frequency spectrogram (FS) Phase spectrogram (PS) Time-frequency representations Musical signals

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TRANSLATING THE MULTI-ACTOR APPROACH TO RESEARCH INTO PRACTICE USING A WORKSHOP APPROACH FOCUSING ON SPECIES MIXTURES

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Frontiers of Agricultural Science and Engineering 2021年第3期8卷 460-473页

作者： Henrik HAUGGAARD-NIELSEN Søren LUND Ane K.AARE Christine A.WATSON laurent BEDOUSSAC Jean-Noel AUBERTOT Iman R.CHONGTHAM Natalia BELLOSTAS Cairistiona F.E.TOPP Pierre HOHMANN Erik S.JENSEN Maureen STADEL Bertrand PINEL Eric JUSTES Department of People and Technology Roskilde UniversityDK-4000 RoskildeDenmark Scotland’s Rural College(SRUC) AberdeenScotlandUnited Kingdom AGIR Univ ToulouseENSFEAINRAECastanet-TolosanFrance AGIR Univ ToulouseINRAECastanet-TolosanFrance Department of Biosystems and Technology Swedish University of Agricultural SciencesSE-23053 AlnarpSweden Instituto navarro de Tecnologias e Infraestructuras Agroalimentarias(INTIA) 31610 VILLAVA(NAVARRA)Spain SRUC EdinburghScotlandUnited Kingdom Department of Crop Sciences Research Institute of Organic Agriculture(FiBL)CH-5070 FrickSwitzerland TERRENA AncenisFrance CIRAD Persyst DepartmentMontpellierFrance

The EIP-Agri multiactor approach was exemplified during a 3-day workshop with 63 project participants from the EU H2020 funded project“Redesigning European cropping systems based on species MIXtures”.The objective was to share firsthand experience of participatory research among researchers who were mostly not familiar with this *** participants were divided into smaller multidisciplinary groups and given the opportunity to interact with representatives from eight actor positions in the value chain of the agrifood cooperative Terrena located in Western *** four stages of the workshop were:(1)key actor interviews,(2)sharing proposed solutions for overcoming barriers,and(3)developing possible interdisciplinary *** of frustration were recorded serving both as a motivation for group members to become more aware of the scientific concerns and practices of their colleagues,as well as a recognition that some researchers have better skills integrating qualitative approaches than ***,the workshop format was an effective way to gain a common understanding of the pertinent issues that need to be addressed to meet overall multiactorapproach *** with the actor networks was identified and emphasized as a means to overcome existing barriers between academia and practice in order to coproduce a shared vision of the benefits of species mixture benefits.

关键词： agroecology codesign intercropping knowledge sharing participatory methods

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