CHAPTER 1
INTRODUCTION
1.1 AUTONOMOUS UNDER WATER VEHICLE
Autonomous underwater vehicles (AUVs) provide marine researchers with new forms of access to the ocean. AUVs are platforms for a variety of sensors: acoustic, magnetic, gravimetric and chemical. One acoustic-based sensor, a multibeam swath mapper, can map seafloor bathymetry with the resolution of a few centimeters. This resolution is sufficient for detecting and measuring seafloor deformation associated with geophysical phenomena, e.g., mid ocean ridge evolution.
This AUV is all ....etc

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Abstract:

Digital audio broadcasting, DAB, is the most fundamental advancement in radio technology since that introduction of FM stereo radio. It gives listeners interference - free reception of CD quality sound, easy to use radios, and the potential for wider listening choice through many additional stations and services.

DAB is a reliable multi service digital broadcasting system for reception by mobile, portable and fixed receivers with a simple, non-directional antenna. It can be operated at any frequency from 30 MHz ....etc

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A New Bit-Allocation Scheme for Coding of Digital Audio Using Psychoacoustic Modeling

Abstract:
In this paper we present a modified adaptive bit-allocation scheme for coding of audio signals using psychoacoustic modeling. Statistical redundancy reduction (lossless coding) generally gives compression ratios up to 2. We increase this ratio using perceptual irrelevancy removal (lossy coding). In this work MPEG-1 Layer-1 standard for psychoacoustic modeling is used and compression is improved by modifying the bit-allocation ....etc

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BackGround
A CDMA (Code Division Multiple Access) based communication system allows the users to share an available frequency spectrum. The users are allocated different codes that are recognizable for the preferred receivers. This solution has several advantages, among other it gives increased robustness to interference. The CDMA project will investigate the benefits and losses of using CDMA communication system on an acoustic channel between two computers. The focus of the project will be to study how a higher data rate will affect ....etc

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Application System Modeling Data Modeling through ER Model
Context Level Diagram
Data Flow Diagram
1. It is a graphical tool for designing systems ,input ,process and output.
2. It represents flow of data through system.
3. It shows the processes ,data stores ,sources & destination entities .
4. The transformation of data from input to output through process is described logically.
5. The top level diagram is called context diagram. It contains single process .It gives a broad overview of the system under ....etc

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Presented by
AKHILESH.S




Introduction

3D audio system developed by William.G.Gardner.

Sound cards, multimedia speakers, video
games etc.. Are marketed as having 3D capability.

A new technology called Acoustic Environment modeling has emerged which combines basic 3D technology to simulate natural acoustic scenes.

3D AUDIO SYSTEM

A 3D audio system has the ability to position sounds all around a listener.

Here the sound is created by headphones, but th ....etc

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