Acoustic echo arises due to acoustic coupling between the loudspeaker and the microphone of a communication device. Acoustic echo cancellation and suppression techniques are used to reduce the acoustic echo. In this work we propose to first cancel the early echo, which is related to the early part of the echo path, and subsequently suppress the late echo, which is related to the later part of t...

PURPOSE To compare lesion enhancement after injection of gadopentetate dimeglumine on spin-echo and gradient-echo T1-weighted images. METHODS A total of 48 contrast-enhancing intracranial lesions were evaluated using a spin-echo and two gradient-echo T1-weighted pulse sequences. Percent contrast, contrast-to-noise, and signal-to-noise measurements were made on the spin-echo T1-weighted, three...

Acoustic echoes arise whenever there is acoustic coupling between a loudspeaker and a microphone. A traditional solution for eliminating the undesired echo signal is an acoustic echo canceler (AEC), which identifies the echo path between a loudspeaker and a microphone by means of an adaptive filter. The echo signal can be canceled successfully when the modeling filter approaches the true echo p...

tials. London: Greenwich Medical Media, 1996. 6. Foldes K, Gaal M, Balint P et al. Ultrasonography after hip arthroplasty. Skel Radiol 1992;21:297±9. 7. Christensen RA, Van Sonnenberg E, Casola G, Wittich GR. Interventional ultrasound in the musculoskeletal system. Radiol Clin North Am 1988;26:145±56. 8. Swen WAA, Bruyn GA, Dijkmans AC. Why rheumatologists should be interested in sonography. Rh...

The aim of this paper is to design and simulate an AEC in order to enhance the quality of speech disturbed by echo phenomenon. Therefore, in order to design the normalized adaptive AEC, we have used digital signal processing techniques, especially Simulink embedded functions. Effectiveness of the suggested AEC using adaptive normalized algorithm was verified using Matlab/Simulink software. Fina...

SURFACE ECHO. A. Safaeinili, W. Kofman, A. Herique, Y. Gim, T. Hagfors, D. Kirchner, D. Gurnett, E. Nielsen, J.J. Plaut, G. Picardi Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 ([email protected]) Labratoire de Planetologie, de Grenoble CNRS/UJF, France, Max Plank Institute for Solar System, Dept. of Physics and Astronomy, Univ. of Iowa Infocom Dep...

R. L. Barry, R. S. Menon Centre for Functional and Metabolic Mapping, Robarts Research Institute, London, Ontario, Canada, Departmant of Biomedical Engineering, University of Western Ontario, London, Ontario, Canada, Department of Diagnostic Radiology and Nuclear Medicine, University of Western Ontario, London, Ontario, Canada Introduction The spatio-temporal variation of magnetic field inhomog...

Originalarbeiten Binder T, Assayag P, Baer FM, Flachskampf F, Kamp O, Nienaber C, Nihoyannopoulos, P, Pierard L, Steg G, Vanoverschelde JL, van der Wouw P, Meland N, Marelli C, Lindvall K NC100100, a new echo contrast agent for the assessment of myocardial perfusion safety and comparison with technetium-99m sestamibi single-photon emission computed tomography in a randomized multicenter study C...