sir,
Iam BE computer science & engg. student.May i get seminar report and ppt on the topic captcha. ....etc

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ppt on audio spotlighting seminars ....etc

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Hello .. I m Vinod
And i Need powerpoint Slides on Audio Spotlighting topic.
or u can mail me at [email protected] ....etc

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Breaking Audio CAPTCHAs




Introduction

CAPTCHAs are automated tests designed to tell computers and humans apart by
presenting users with a problem that humans can solve but current computer programs
cannot. Because CAPTCHAs can distinguish between humans and computers with high
probability, they are used for many different security applications: they prevent bots from
voting continuously in online polls, automatically registering for ....etc

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i need algorithms used to generate captchas for my presentation (ppt) and (doc)
....etc

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Captchas are tests that distinguish human from software botsin an online environment, used to stop bots abusing services intended for humans. Paypal and Yahoo have captchas in their new user registration process, but there are programs toovercome them. Investigate proposals for new kinds of captchas. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, ....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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Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use




INTRODUCTION AND MOTIVATION

The goal of a CAPTCHA1 is to dierentiate humans
from automated agents by requesting the solution to a
problem that is easy for humans but dicult for com-
puters. CAPTCHAs are used to guard access to web re-
sources and, therefore, prevent automated agents


Making CAPTCHAs Accessible

Audio CAPTCHAs were introduced soon after their vi-
sual alterna ....etc

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Abstract
Security researchers have, for long, devised mechanismsto prevent adversaries from conducting automated networkattacks, such as denial-of-service, which lead to significantwastage of resources. On the other hand, several attempts havebeen made to automatically recognize generic images, make themsemantically searchable by content, annotate them, and associatethem with linguistic indexes. In the course of these attempts, thelimitations of state-of-the-art algorithms in mimicking humanvision have become exposed. In this paper, we ....etc

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Packet loss concealment using audio morphing

Presented By:
Franck Bouteille¹
Pascal Scalart²
Balazs Kövesi²


Motivation


In packet data networks, excess traffic leads to delays or loss in delivery of information. In voice communication, long delays are intolerable and network delay budgets have strong influence on the design of packet voice systems.
To increase the tolerance of packet voice systems to lost packets some techniques have been developed.
These techniques do not use the a posteriori informati ....etc

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