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.