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Combining Artificial and Natural Background Noise in Personal Audio Systems 10

Combining Artificial and Natural Background Noise in Persona...

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Wallace, Daniel Cheer, Jordan Univ Southampton Inst Sound & Vibrat Res Southampton Hants England

ISBN: (纸本)9781538647523

Personal audio systems are designed to deliver spatially separated regions of audio to individual listeners. This paper presents a method for improving the privacy of such systems. The level of a synthetic masking signal is optimised to provide specified levels of intelligibility in the bright and dark sound zones and reduce the potential for annoyance of listeners in the dark zone by responding to changes in ambient noise. Results from a simulated personal audio system indicate that less acoustic contrast is required to produce the same level of privacy when artificial masking is included in the system design, compared with relying on the masking effect of background noise alone. As privacy requirements become more challenging, the advantage gained by incorporating artificial masking increases.

关键词： Noise measurement Audio systems Privacy Psychoacoustics array signal processing"

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Performance Analysis of Time frequency Subspace based Direction Finding algorithms in presence of perturbed array manifold

Performance Analysis of Time frequency Subspace based Direct...

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Belouchrani, Adel Khodja, Mohamed Ecole Natl Polytech Dept Elect Engn Algiers Algeria

ISBN: (纸本)9781479914814

Conventional subspace based direction finding approaches such as MUSIC and ESPRIT algorithms commonly use the array data covariance matrix. In non stationary context, the use of the Spatial Time-Frequency Distribution (STFD) instead of the covariance matrix can significantly improve the performance of such algorithms. In this paper we are interested in the performance analysis of such approaches in the presence of both additive noise and perturbed array manifold. An unified expression of the Direction Of Arrival (DOA) error estimation is derived for both approaches. The obtained results show that for low signal to Noise Ratio (SNR) and high signal to sensor Perturbation Ratio (SPR) the STFD based DOA estimations perform better, while for high SNR and for the same SPR both Covariance and STFD based approaches have similar performance.

关键词： direction finding variance covariance matrix low SNR Direction of arrival estimation high SNR Subspace Multiple signal classification Additive noise Manifolds Covariance United States Department of Agriculture based Covariance matrix

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A Robust Adaptive sensor array with Slepian Sequences

A Robust Adaptive Sensor Array with Slepian Sequences

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Trump, Tonu Tallinn Univ Technol Inst Radio & Telecommun Engn Tallinn Estonia

ISBN: (纸本)9781467310710

This paper investigates an adaptive beamforming technique that is robust against imperfect knowledge of signal and interference arrival directions, antenna calibration errors and other similar imperfections. The proposed technique is based on Generalized Sidelobe Canceller but uses Slepian sequences in both the steering and blocking lobes of the algorithm. Only Slepians corresponding to large spectral concentrations are used in the branches. The theoretical results are verified in a simulation study.

关键词： arrays Robustness Eigenvalues and eigenfunctions Vectors array signal processing Transmission line matrix methods signal processing algorithms

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Optimal linear constraints and subspace adaptive filtering

Optimal linear constraints and subspace adaptive filtering

引用

1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Rabideau, DJ MIT Lincoln Lab Lexington MA 02420 USA

ISBN: (纸本)0780363396

Linearly constrained adaptive filters can remove interference while preserving signals of interest. However, in many applications the interference and signals are distributed throughout a large space. In such cases, fully adaptive filtering is difficult to implement. Instead, data is typically partitioned into subspaces. Then, within each subspace, interference is cancelled. Finally, the resulting subspace signals are recombined. This procedure is used in many fields, such as wideband radar, sonar, communications, and radio astronomy {relevant techniques include subband adaptive beamforming/filtering, adaptive subarrays, Frequency Jump Burst processing, and Space-Time Adaptive processing}. The purpose of this paper is to: (1) quantify the performance associated with subspace adaptation, and (2) enumerate techniques to improve its performance. In particular, we formulate a new class of "optimal linear subspace constraints." The benefits of these techniques are quantified and compared.

关键词： Adaptive filters array signal processing Filtering Frequency Interference cancellation Interference constraints Radio astronomy Sonar Spaceborne radar Subspace constraints

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Network Theory-Based Generic Model for Oversampled Receive Antenna arrays

Network Theory-Based Generic Model for Oversampled Receive A...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Abramovich, Yuri I. San Antonio, Geoffrey WR Syst Fairfax VA 22030 USA US Navy Res Lab Washington DC 20375 USA

In this paper we derive a generic signal processing model for oversampled linear antenna arrays based on network theory and Nyquist sampling theory. The theoretical model is verified with experimental data collected o... 详细信息

ISBN: (纸本)9781467310710

关键词： Over-the-horizon radar oversampled array HF

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Cellular and PCS propagation measurements and statistical models for urban multipath on an antenna array

Cellular and PCS propagation measurements and statistical mo...

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1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Keller, CM Bliss, DW MIT Lincoln Lab Lexington MA 02173 USA

ISBN: (纸本)0780363396

Multipath propagation has a significant impact on the performance of cellular and Personal Communication Services (PCS) systems in urban environments. This paper contains analyses to better understand urban multipath and examines the use of base-station antenna arrays to obtain spatial diversity. The results are based on data collected on large sparse aperture arrays and finely sampled arrays at a location below surrounding rooftop heights for both PCS and cellular frequencies. A statistical model is formulated to explain the relationship between multipath scatterers and signal cross-correlations as a function of antenna spacing.

关键词： Adaptive arrays Antenna arrays Antenna measurements Antennas and propagation Aperture antennas Broadband antennas Decorrelation Personal communication networks Receiving antennas Scattering

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Combining transmit beamforming and orthogonal space-time block codes by utilizing side information

Combining transmit beamforming and orthogonal space-time blo...

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1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Jöngren, G Skoglund, M Ottersten, B Royal Inst Technol SE-10044 Stockholm Sweden

ISBN: (纸本)0780363396

Recently, efficient space-time codes have been developed that achieve a large portion of the capacity available in communication systems employing multiple transmit and receive antennas. These codes are designed under the assumption that the transmitter has no knowledge about the channel. In this work, on the other hand, we consider the case when the transmitter has partial, but not perfect, knowledge about the channel and how to improve the code so that this fact is taken into account. A transmit scheme is proposed that combines the benefits of conventional beamforming with those given by orthogonal space-time block codes. Simulation results using four transmit antennas demonstrate significant gains.

关键词： Antenna arrays array signal processing Block codes Fading Receiving antennas signal processing Space technology Space time codes Transmitters Transmitting antennas

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Analysis of a tripole array for polarization and direction of arrival estimation

Analysis of a tripole array for polarization and direction o...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Lundbäck, J Nordebo, S Vaxjo Univ Sch Math & Syst Engn S-35195 Vaxjo Sweden

ISBN: (纸本)0780385454

In this paper we evaluate the performance of a Tripole array for estimation of the polarization and one dimensional direction of arrival (DOA). We employ a model based on far-field calculations of a Tripole antenna and completely polarized electromagnetic waves carrying Gaussian distributed signals. The analysis of the performance is based on calculations of the Cramer-Rao Lower Bound (CRLB) for the polarization and DOA estimators. It is seen that the Tripole array is suitable for polarization estimation with or without knowledge of the DOA. It is also seen that the quality of the DOA estimate depends strongly on the polarization state.

关键词： signal processing

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Nearfield spot-beamforming with distributed arrays

Nearfield spot-beamforming with distributed arrays

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1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Flaig, A Arce, GR Univ Delaware Newark DE 19716 USA

ISBN: (纸本)0780363396

The concept of spot-beamforming with distributed arrays (DAs) is introduced. DAs are array-source configurations whose array elements are spatially dispersed submerging the sources in the nearfield of the array, where they can be distinguished not only by their angular but also by their range signature. The resulting enhanced spatial discrimination capabilities reflected in a beampattern characterized by spot-like mainlobes lend DAs optimality properties. A gradient based algorithm for the joint optimization of the array geometry and the shading coefficients of a narrowband spot-beamformer in a stationary multiple source system is derived, and its convergence and performance are discussed. An important subclass of DAs, namely distributed linear arrays are introduced. This class is of practical significance and has the important property of being ambiguity-free in the limit for high SNR. For DAs with an arbitrary geometry, which can suffer from spatial aliasing, a set description of the ambiguities is given.

关键词： near-field spot-beamforming distributed arrays optimal array geometries gain resolution ambiguity

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The global matched filter: Application to DOA estimation with an uniform circular array

The global matched filter: Application to DOA estimation wit...

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1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Fuchs, JJ Univ Rennes 1 IRISA F-35042 Rennes France

ISBN: (纸本)0780363396

The problem of estimating the direction of arrivals (DOA's) of narrow-band sources impinging on a uniform circular array is considered. We present a method that uses as input the values of a small number of uniformly spaced beams and apply a model-fitting approach taking into account the statistical properties of the beams. The approach called the "global matched filter" fits simultaneously to the observations all the elements from a given dictionary needed to explain them. It chooses among all the so-obtained representations satisfying a given physically appealing constraint the one with minimal energy. This representation is in general quite sparse. The method drastically improves upon the conventional beamformer and has performance comparable to the best high resolution techniques. It further applies when the number of sources exceeds the number of sensors, a situation that cannot be handled by standard high resolution techniques.

关键词： Apertures Dictionaries Direction of arrival estimation Energy resolution Matched filters Mobile communication Narrowband Radar applications sensor arrays Sonar applications

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