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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R. V. Karanth ¹, S. Kathiroli ², S. Badrinarayanan ², D. Venkata Rao ², S. N. Rajaguru ², K. M. Sivakholundu ², B. Sasisekaran ²

Affiliations
1 Department of Geology, M.S. University of Baroda, Vadodara - 390 002, IN
2 National Institute of Ocean Technology, Chennai-600 031, IN

Abstract

No Abstract.

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S. Kathiroli ¹, S. Badrinarayanan ¹, D. Venkata Rao ¹, S. N. Rajaguru ², K. M. Sivakholundu ¹, B. Sasisekaran ¹

Affiliations
1 National Institute of Ocean Technology, Chennai - 600 036, IN
2 Deccan College, Pune - 411 006, IN

Abstract

Detailed underwater surveys carried out in the Gulf of Cambay, about 20 km west of Hazira, deploying side scan sonar and sub bottom profiler brought to light, the presence of a submerged palaeochannel traceable to a length of 9 km. Associated with this on either side are basement like features found in a grid pattern at water depths of 20-40 m. Sub-surface sampling carried out with dredge and grab sampler revealed stone artefacts, potsherds, hearth pieces, animal bones and human teeth embedded in fluvial sands and silts. In the upper part of the deposit, a carbonised wooden log was found and dated to around 9500 years BP by ¹⁴C method. Marine magnetic survey carried-out does not indicate the presence of any major metallic debrislobjects. This appears to be one of the early records of prehistoric human activity of early Holocene age in the marine environment of India.

Keywords

Marine Archaeology, Holocene, Palaeo Channel, Side Scan Sonar, Sub Bottom Profiler, Carbon Dating, Artefacts, Gulf of Cambay.

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M. Venkata Ratnam ¹, D. Venkata Rao ², L. Giridhar ¹

Affiliations
1 Department of Anthropology, Andhra University, Visakhapatnam, Andhra Pradesh, IN
2 Department of Economics, Andhra University, Visakhapatnam, Andhra Pradesh, IN

Abstract

Deforestation is an environmental issue which received much attention globally from anthropologists, environmentalists, ecologists, planners, administrators, natural scientists and social scientists. Currently, a lot of debate is going on this issue at the national and international levels. The government has also initiated aforestation programmes with different strategies to regenerate the forest in order to maintain natural balance. Deforestation has created survival problem to them, which has much influence, as their livelihood directly depend on forest resources. At present, the problem of deforestation directly affected the livelihoods of tribes including chenchus and thus creating food insecurity. Poverty and food insecurity are the major problems to chenchus which are closely linked with deforestation. The present study focuses on these issues and provides certain suggestions and policy recommendation for the betterment of life of chenchus.

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