The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Srdan Kitic - One of the best experts on this subject based on the ideXlab platform.
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Time Domain Velocity Vector for Retracing the Multipath Propagation
arXiv: Audio and Speech Processing, 2020Co-Authors: Jerome Daniel, Srdan KiticAbstract:We propose a conceptually and computationally simple form of sound Velocity that offers a readable view of the interference between direct and indirect sound waves. Unlike most approaches in the literature, it jointly exploits both active and reactive sound intensity measurements, as typically derived from a first order ambisonics recording. This representation has a potential both as a valuable tool for directly analyzing sound multipath propagation, as well as being a new spatial feature format for machine learning algorithms in audio and acoustics. As a showcase, we demonstrate that the Direction-Of-Arrival and the range of a sound source can be estimated as a development of this approach. To the best knowledge of the authors, this is the first time that range is estimated from an ambisonics recording.
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ICASSP - Time Domain Velocity Vector for Retracing the Multipath Propagation
ICASSP 2020 - 2020 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2020Co-Authors: Jerome Daniel, Srdan KiticAbstract:We propose a conceptually and computationally simple form of sound Velocity that offers a readable view of the interference between direct and indirect sound waves. Unlike most approaches in the literature, it jointly exploits both active and reactive sound intensity measurements, as typically derived from a first order ambisonics recording. This representation has a potential both as a valuable tool for directly analyzing sound multipath propagation, as well as being a new spatial feature format for machine learning algorithms in audio and acoustics. As a showcase, we demonstrate that the Direction-of-Arrival and the range of a sound source can be estimated as a development of this approach. To the best knowledge of the authors, this is the first time that range is estimated from an ambisonics recording.
Jerome Daniel - One of the best experts on this subject based on the ideXlab platform.
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Time Domain Velocity Vector for Retracing the Multipath Propagation
arXiv: Audio and Speech Processing, 2020Co-Authors: Jerome Daniel, Srdan KiticAbstract:We propose a conceptually and computationally simple form of sound Velocity that offers a readable view of the interference between direct and indirect sound waves. Unlike most approaches in the literature, it jointly exploits both active and reactive sound intensity measurements, as typically derived from a first order ambisonics recording. This representation has a potential both as a valuable tool for directly analyzing sound multipath propagation, as well as being a new spatial feature format for machine learning algorithms in audio and acoustics. As a showcase, we demonstrate that the Direction-Of-Arrival and the range of a sound source can be estimated as a development of this approach. To the best knowledge of the authors, this is the first time that range is estimated from an ambisonics recording.
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ICASSP - Time Domain Velocity Vector for Retracing the Multipath Propagation
ICASSP 2020 - 2020 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2020Co-Authors: Jerome Daniel, Srdan KiticAbstract:We propose a conceptually and computationally simple form of sound Velocity that offers a readable view of the interference between direct and indirect sound waves. Unlike most approaches in the literature, it jointly exploits both active and reactive sound intensity measurements, as typically derived from a first order ambisonics recording. This representation has a potential both as a valuable tool for directly analyzing sound multipath propagation, as well as being a new spatial feature format for machine learning algorithms in audio and acoustics. As a showcase, we demonstrate that the Direction-of-Arrival and the range of a sound source can be estimated as a development of this approach. To the best knowledge of the authors, this is the first time that range is estimated from an ambisonics recording.
D.g. Pavel'ev - One of the best experts on this subject based on the ideXlab platform.
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Control of the dipole Domain propagation in a GaAs/AlAs superlattice with a high-frequency field
Physical Review B, 2002Co-Authors: Ekkehard Schomburg, R. Scheuerer, Karl Friedrich Renk, K. Hofbeck, M. Haeussler, A. K. Jappsen, Andreas Amann, Andreas Wacker, Eckehard Schöll, D.g. Pavel'evAbstract:We observed that the propagation of a dipole Domain in a GaAs/AlAs superlattice can be controlled by an external high-frequency field. The doped GaAs/AlAs superlattice showed a negative differential conductance giving rise to propagating dipole Domains. Depending on the frequency of the high-frequency field, either frequency-locked or quasiperiodic propagating Domain states occurred. The behavior can be described by a "devil's staircase," where in the locked state the ratio of the external frequency and the Domain transit frequency is a rational number. A theoretical analysis indicates that the high-frequency field controls the Domain propagation by a modification of both the Domain Velocity and the shedding of the Domains from the cathode.
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An InGaAs/InAlAs Superlattice Oscillator for Frequencies Above 100 GHz
2000Co-Authors: R. Scheuerer, Ekkehard Schomburg, A. Ignatov, Karl Friedrich Renk, D.g. Pavel'evAbstract:Abstract : We present an InGaAs/InAlAs superlattice oscillator at 150 GHz with a superlattice device mounted in a waveguide and biased at a voltage of 1.3 V (current 15 mA), radiation of a power of 0.1 mW was generated. In the doped superlattice, the electron motion is governed by miniband transport, leading to a negative differential conductance due to Bragg reflection of the electrons at the miniband boundary. As a consequence, propagating charge carrier Domains are formed giving rise to microwave generation with the frequency determined by the Domain Velocity. By using superlattices with thinner layers it should be possible to reach higher Domain velocities, and hence higher oscillation frequencies.
Daniela Constantinescu - One of the best experts on this subject based on the ideXlab platform.
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ACC - Passive Velocity filtering for haptic applications with wave control
2012 American Control Conference (ACC), 2012Co-Authors: Naser Yasrebi, Daniela ConstantinescuAbstract:This paper introduces a passive Velocity filtering technique for multirate haptic applications with wave variable control. In the proposed method, Velocity is estimated via Euler's method and is filtered in the wave Domain using a filter bank-like structure placed in the communications. The paper derives the passivity condition for the wave Domain communications with the filter bank, and uses it to set up a minimax optimization which yields the Velocity filter. Frequency Domain analysis of haptic interaction in a slowly updated virtual environment predicts that the proposed wave Domain Velocity filter increases the transparency of the interaction. Experiments in which a Novint Falcon haptic device touches a slowly updated virtual wall show significantly less noise in the force feedback provided to the user.
Ekkehard Schomburg - One of the best experts on this subject based on the ideXlab platform.
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Control of the dipole Domain propagation in a GaAs/AlAs superlattice with a high-frequency field
Physical Review B, 2002Co-Authors: Ekkehard Schomburg, R. Scheuerer, Karl Friedrich Renk, K. Hofbeck, M. Haeussler, A. K. Jappsen, Andreas Amann, Andreas Wacker, Eckehard Schöll, D.g. Pavel'evAbstract:We observed that the propagation of a dipole Domain in a GaAs/AlAs superlattice can be controlled by an external high-frequency field. The doped GaAs/AlAs superlattice showed a negative differential conductance giving rise to propagating dipole Domains. Depending on the frequency of the high-frequency field, either frequency-locked or quasiperiodic propagating Domain states occurred. The behavior can be described by a "devil's staircase," where in the locked state the ratio of the external frequency and the Domain transit frequency is a rational number. A theoretical analysis indicates that the high-frequency field controls the Domain propagation by a modification of both the Domain Velocity and the shedding of the Domains from the cathode.
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An InGaAs/InAlAs Superlattice Oscillator for Frequencies Above 100 GHz
2000Co-Authors: R. Scheuerer, Ekkehard Schomburg, A. Ignatov, Karl Friedrich Renk, D.g. Pavel'evAbstract:Abstract : We present an InGaAs/InAlAs superlattice oscillator at 150 GHz with a superlattice device mounted in a waveguide and biased at a voltage of 1.3 V (current 15 mA), radiation of a power of 0.1 mW was generated. In the doped superlattice, the electron motion is governed by miniband transport, leading to a negative differential conductance due to Bragg reflection of the electrons at the miniband boundary. As a consequence, propagating charge carrier Domains are formed giving rise to microwave generation with the frequency determined by the Domain Velocity. By using superlattices with thinner layers it should be possible to reach higher Domain velocities, and hence higher oscillation frequencies.