Informatics Publishing Limited

Ch Sreenivasa Rao ¹, D. Venkata Rao ², S. Lakshminarayana ¹

Affiliations
1 Department of ECE, KL University, IN
2 NIT, Narsaraopet, Guntur, IN

Abstract

To overcome the basic system inversion problems in conventional crosstalk cancellation systems, the three channel Optimum Source Distribution (OSD) was developed by Takashi et al., that provides balance between in-phase and out of phase components. The main difficulty in this system is real-time implementation of cross talk cancellation filters on DSP platforms, particularly when filter lengths are very long with system operates on multichannel inputs. This paper discusses the implementation complexities and proposes an efficient approach to reduce the power consumption. It also discusses efficient usage of available processor memory. By utilizing the processor resources and existing frequency domain techniques, this approach would be one of best methods for long filters. The mathematical model, with efficient design for floating point DSP processors, clearly explains the optimization methods at algorithmic and instruction levels. The computational complexity of the proposed method was measured for various multi-channel input sources and the comparison was shown. The results indicate that the proposed method provides efficient computations than existing methods.

Keywords

Convolution, Crosstalk Cancellation, Optimal Source Distribution, Overlap Save Method, Uniform Partitioned Convolution.

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A. S. Subrahmanyam ¹, S. Lakshminarayana ¹, D. V. Chandrasekhar ¹, K. S. R. Murthy ¹, T. C. S. Rao ¹

Affiliations
1 National Institute of Oceanography, Regional Centre, Visakhapatnam - 530 017, IN

Abstract

Detailed analysis of magnetic and bathymetric data over shelf and slope regions of Cauvery basin, east coast of India. between Mahabalipuram and Vedaranyam demarcated three major offshore lineaments trending N-S, NE-SW and E-W. The N-S lineation has been interpreted as due to dyke intrusions. NE-SW lineament reflects the offshore extension of a major basement depression, viz., the Pondicherry depression. E-W lineation, south of Porto Novo reveals a basement high suggesting the seaward extension of Kumbakonam ridge within the Pondicherry depression. The present analysis gives mosaic of a deep seated graben block flanked by rift related volcanic intrusives over the shelf region of the basin.

Keywords

Structure, Marine Geophysics, Cauvery Basin.

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K. S. R. Murthy ¹, M. M. Malleswara Rao ¹, K. Venkateswarlu ¹, A. S. Subrahmanyam ¹, S. Lakshminarayana ¹, T. C. S. Rao ¹

Affiliations
1 Regional Centre, National Institute of Oceanography, 176, Lawson's Bay Colony, Visakhapatnam-530017, IN

Abstract

Magnetic data of the eastern continental margin of India (ECMI) helped in demarcating the offshore extension of the granulite belts of east coast of India and their possible link to those of the East Antarctica. Short wavelength and high amplitude negative magnetic anomalies (200 to 1600 nT) are observed over the northern part of ECMI between Kakinada and Chilka lake and also off Madras shelf, the coastal regions of which are associated with granulite facies rocks . This part of the shelf is associated with structural lineaments with predominant NE-SW trends . In contrast, the offshore basins off Cauvery, Krishna - Godavari (K-G) and Mahanadi rivers are associated with subdued positive anomalies (less than 200 nT) indicating subsidence off these basins by heavy load of Phanerozoic/younger shelf sediments. Structural lineaments with NW-SE or W-E trends delineated over these basins are related to the offshore extension of these rift related Gondwana grabens. Similarity in the trends of the magnetic anomalies and the granulite facies on the east coast of India and their correlation with the granulite belt of Enderby Land of Antarctica supports the view that the entire region comprised of a single and stable block of granulite rocks prior to the fragmentation of the Gondwanaland. The study also suggests probable continuation of Mahanadi and Godavari grabens into East Antarctica.

Keywords

Marine Geophysics, Magnetic Anomalies, Eastern Ghat Granulite Belt, Enderby Land , Antarctica.

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A. V. V. Pavani ¹, D. Tejasri ¹, R. Revathi ¹, K. S. Ramesh ¹, S. Koteswara Rao ¹, S. Lakshminarayana ¹

Affiliations
1 Guntur, Andhra Pradesh, IN

Abstract

Background/Objectives: Ionospheric total electron content perturbations generated by earthquake occurred in Indonesia are analyzed. Methods/Statistical Analysis: The vertical total electron content data on the earthquake day is detrended such that it can be analyzed using statistical signal processing algorithms. Modified periodogram algorithm is implemented on both the disturbed and undisturbed vertical total electron content data. Findings: From the power spectral densities of modified periodogram, the time of occurrence of earthquake is observed and it is noted that it is matching with the actual time of occurrence of event considered. Application/Improvement: This analysis aids in developing an early warning system for earthquakes.

Keywords

Atmospheric Sciences, Earthquakes, Global Positioning System, Statistical Signal Processing.

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U.V.S. Seshavatharam ¹, S. Lakshminarayana ²

Affiliations
1 Honorary faculty, I-SERVE, Survey no-42, Hitech city, Hyderabad-84, Telangana, IN
2 Dept. of Nuclear Physics, Andhra University, Visakhapatnam-03, AP, IN

Abstract

We make an attempt to review our light speed expanding Hubble-Hawking model of cosmology with reference to cosmic age, temperature, curvature, angular velocity, various cosmological distances associated with galactic red shifts, galactic flat rotation speeds, galactic dark matter and galactic working radii.

Keywords

Planck scale; Big bang; Light speed expansion; Hubble-Hawking model.

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