Final- Voice Controlled Switching System

8/10/2019 Final- Voice Controlled Switching System

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Voice ControlledSwitching System

SUPERVISED BY:-PROF.Z.A.JAFFERY


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INTRODUCTION TO VOICECONTROLLED SYSTEM

VOICE RECOGNITION is a technology by which sounds , words orphrases spoken by humans are converted into electrical signals, and

these signals are transformed into coding patterns to which meaninghas been assigned.

Speech processing extracts the desired information from a speech signal.It encompasses SPEAKER RECOGNITION and SPEECHRECOGNITION.


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APPLICATIONS

Financial Applications.

Forensic and Legal Applications.

Access Control (Security) Applications.

Time and attendance system.

Security against car/automobile theft.


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ADVANTAGES OVER THEOTHER SYSTEMS

Other systems Problems withother systems

Advantages ofspeech process. sys.

Fingerprints and palmrecognition system

Some people dont haveusable fingerprints.

No such problem withthis system.

DNA Very complicated dueto the strand structure.

Not very complicated.

Iris recognition system Illumination changes

the shape of the iris.

No effect of

illumination.Retina scanningsystem

Difficulty of obtainingan image, users worryfor the possible risk ofdamage to their retina.

Easy procedure, usersdont need to worryabout any harm tothem.


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BLOCK DIAGRAM OF SPEAKERRECOGNITON MODULE


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MFCC


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PATTERN MATCHING Involves computing a match score, which is a measure of the

similarity between the input feature vectors and some model.

There are two types of models:

STOCHASTICMODELS

TEMPLATEMODELS

STOCHASTIC

MODELSTEMPLATE

MODELS

HMM DTW


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DYNAMIC TIME WARPING (DTW) Method to compensate for speaking-rate variability.

A text-dependent template model is a sequence of templates ( X1,....,XN)that must be matched to an input sequence ( X1 ,.... ,XM ) .


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HIDDEN MARKOV MODEL(HMM)

Speaker verification is a binary kind of decision (one for which theoutcome will be either True or False).

In a binary decision, there are two hypotheses:

Hypothesis Question raised Answer or outcome

Main Hypothesis orNull Hypothesis

Whether the testspeaker is the same as

the target speaker?

YES

Alternative hypothesis Is the test speaker different from thetarget speaker?

NO


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REGULATED POWER SUPPLY

CRYSTAL OSCILLATOR Used to keep track of time, to provide a stable clock signal for digital

integrated circuits.

OR


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RELAY A relay is an electrically operated switch.

TYPES OF RELAYS:

Electromechanical relay :


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Contactor : A type of relay that can handle the high power required todirectly drive an electric motor is called a contactor.

Solid-state relay : A solid-state relay is an ON-OFF control device in which the load current is conducted by one or more semiconductors e.g., a power transistor, an SCR or a TRIAC.

It has no moving components.


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REFERENCES

Homayoon Beigi , FUNDAMENTALS OF SPEAKER RECOGNITION ,Springer , New York, August 2011 .

Joseph P. Campbell Jr. , SPEAKER RECOGNITION: A TUTORIAL,Proceedings of the IEEE, vol.85, no.9, pp.1437-1462,1997.

Wen-Wen Chang, TIME FREQUENCY ANALYSIS AND WAVELETTRANSFORM TUTORIAL --- time-frequency analysis for voiceprint(speaker) recognition, National Taiwan University, Taipei, Taiwan.

Amin Fazel and Shantanu Chakrabartty , AN OVERVIEW OF

STATISTICAL PATTERN RECOGNITION TECHNIQUES FORSPEAKER VERIFICATION , IEEE Circuits and Systems Magazine , 27May 2011.

Raj Kamal , MICROCONTROLLERS. ARCHITECTURE,PROGRAMMING, INTERFACING AND SYSTEM, DESIGN , Pearson

Education, Singapore, First Edition and First Print, 2005.

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Final- Voice Controlled Switching System