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Topic voice Browser Registration # 2013-ag-6094 Name javaria kanwal Supervisor Miss.uzma satter Submitted to Prof. Akmal Rehan

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VOICE BROWSER

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WHAT IS A VOICE BROWSERA voice browser is a device :

that interprets voice input and interprets voice markup languages to generate voice output.

that interprets a script which specifies exactly what to verbally present to the user as well as when to present each piece of information.

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MOTIVATION

There are 10 times as many telephones as connected PCs.

Cell phones usage is growing dramatically.

Speaking and listening are the natural usage modes for modes. Easy to use - for people with no knowledge or fear of computers.

Voice interaction can escape the physical limitations on keypads and displays as mobile devices become ever smaller

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KEY TECHNOLOGIES

Speech Recognition Voice input VoXML file Text

Speech Synthesis Text VoXML file Output(Pre-recorded)

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WORLD WIDE WEB CONSORTIUM(W3C)

World Wide Web Consortium(W3C) develops interpretable technologies(software and tools) to lead the web to its full potential as a forum of information ,commerce and communication.

W3C Speech interface framework VoiceXML Speech recognition Call control

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VOICEXML voiceXML is a dialog markup language designs for

telephony applications where users are restricted to voice and DTMF (touch tone) input.

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SPEECH RECOGNITION

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SPEECH GRAMMAR

Speech grammars allow authors to specify the rules for covering the sequence of words that users are expected to say in particular context.

These contextual clues allow the recognition engine to focus on likely utterances , improving the chances of the correct match

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STOCHASTIC (N GRAM) LANGUAGE MODELS

Speech grammar is un useful in case of open- ended prompt e.g. how can I help you

The solution is to use a stochastic language models. such models specify the probability that one word occurs following certain others. the probabilities are computed from the collection of utterances collected from many users.

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SEMANTIC INTERPRETATION

The recognition process matches an utterance to a speech grammar, building a parse tree as a byproduct.

There are two approaches to harvesting semantic rules from the parse tree :

1. Automating grammar rules with semantic interpretation tags

2. Representing the results in XML

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CALL CONTROL

Fine-grained control of speech (signal processing ) resources and telephony resources in a VoiceXML telephony platform.

Will enable application developers to use markup to perform call screening, whisper call waiting call transfer, and more.

Can be used to transfer a user from on voice browser to another on a completely different machine.

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APPLICATIONS

It can be divided into three categories : Web Browsing Limited information Access Spoken Dialog Systems

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FUTURE•Voice browsing will become visual(Multi-modal)•Can be integrated to an OS•Integrated to every application.

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CONCLUSION

Browser technology is changing very fast these days and we are moving from the visual paradigm to the voice paradigm.

Voice browser is the technology to enter this paradigm.

Voice browser is a device which interpret voice input and generate voice output.

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Thank you

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