Dov Ramm
IBM
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Publication
Featured researches published by Dov Ramm.
international conference on pattern recognition | 2010
Dan Shmuel Chevion; Yaakov Navon; Dov Ramm
A new method for retrieving seismic data from a seismic section provided in a bitmap format is described. The method is based on image processing techniques and includes creating a grey level image of a seismic section, processing the grey level image (by integration, filtering, etc.) and then reconstructing digitized values of individual seismic traces_ from the resulting image, thus ending with the data in standard SEG-Y format
conference on advanced signal processing algorithms architectures and implemenations | 1994
Dov Ramm; Dan Chazan
Many applications, such as directive microphone arrays, employ linearly filtered signals from a number of sensors to enhance an audio source embedded in noise produced by other audio sources. It turns out that the noise cancellation properties are improved with the length of the filters, and filters possessing as many as 4000 taps may be used beneficially. For such filters, the techniques of adaptive filtering are inadequate resulting in poor convergence and noise cancellation properties. In this work it will be shown how to combine fast filter adaptation with accurate noise cancellation. A judicious choice of basis functions (modulated gaussians) leads to a sparse system of equations, resulting in a low computational complexity of the solver. In the first stage of the algorithm the relevant correlation functions are computed very rapidly using an FFT technique. This calculation requires about NlogN operations and produces the coefficients of a system of linear equations for the filter coefficients. In the second stage these equations are solved with a complexity of the number of equations, N, rather than in N2 operations as is the case for the usual Toeplitz solvers or in NlogN for contemporary fast Toeplitz solvers. The proposed scheme is superior to previously used schemes for filter lengths beginning from 50. The algorithm had been implemented in a single microphone noise canceller and in a directive microphone array.
Archive | 1991
Cesar A. Gonzales; Dov Ramm; Eric Viscito
Archive | 1992
Abraham Zvi Meiri; Dov Ramm
Archive | 2008
Dan Shmuel Chevion; Dov Ramm; Yuval Shimony; Ron Sivan
Archive | 1998
Emanuel Gofman; Franklin Gracer; Ehud Karnin; Mark A. Lavin; Dov Ramm
Archive | 2003
Gregg M. Gallatin; Emanuel Gofman; Kafai Lai; Mark A. Lavin; Maharaj Mukherjee; Dov Ramm; Alan E. Rosenbluth; Shlomo Shlafman
Journal of the Acoustical Society of America | 1997
Dov Ramm; Dan Chazan
Archive | 2004
Gregg M. Gallatin; Emanuel Gofman; Kafai Lai; Mark A. Lavin; Dov Ramm; Alan E. Rosenbluth; Shlomo Shlafman; Zheng Chen; Maharaj Mukherjee
Archive | 2005
Gregg M. Gallatin; Emanuel Gofman; Kafai Lai; Mark A. Lavin; Maharaj Mukherjee; Dov Ramm; Alan E. Rosenbluth; Shlomo Shlafman