Electronic and Communication - Engineering

Abstract: The digital video coding is a rapidly evolving field. Although its applications are numerous (from TV broadcasting to video conference), bit rate reduction is always needed .This has led to intensive efforts toward effective video compression techniques. In this work an adaptive codec scheme of H.263 standard that depends on transform coding (DCT) and quantization process in compression is proposed. In addition motion estimation search algorithms were used to estimate the predictive frames.

Abstract: An omni-directional antenna for telemetry, tracking and command (TT&C) com- munications is required for spin-stabilized geostationary satellites whether in the launching phase or once in orbit. The need for a despun platform can even be reduced by implementing a conformal microstrip antenna array °ush mounted on the cylindrical surface of the satellite for that purpose. The analysis and design of this kind of antennas is quite complicated and a powerful simulation software proves indispensable to achieve this goal.

Abstract: This thesis deals with design and analysis of both fullband and subband adaptive filters and compared between them with applications in real speech. . The Normalized Least Mean Square (NLMS) algorithm has been used to make control an adaptive filter. In fullband adaptive filter the system shows slow convergence time compared with subband adaptive filter with lower signal to noise ratio is gave about 0.00003 noise reduction with (S/N) = 3.24 dB according to woman voice and gave 0.000015 with (S/N) =3.68 dB according to man voice when both tested with real speech.