Speech Recognition using DWT
#1

presented by:
Shyam Sundar Rath

[attachment=10547]
Why Speech Recognition ?????
 Decrease the human intervention in different processes or in other words automate them.
 Security and privacy of documents.
DSP in Speech Recognition
 DSP has its own functions in Mat lab for Speech Recognition.
 Provides best quality of voice processing.
➌ Offers various options like
 DFT
 STFT
 SCFT
 DWT
Challenges in speech Recognition
 Human speech parameterized by different variables which vary from speaker to speaker.
 Speech signal consists of both vowels and consonants.
 Speech signal is not stationary.
 Languages vary the speech.
Approaches
 Feature Extraction.
 Frequency domain analysis.
 FT
Projects signals onto complex sines and cosines, infinitely long signals
 WT
Carries both temporal location - like an impulse - and frequency content - like a sinusoid.
Conception of wavelets
➊ Wavelets are localized waves and have their energy concentrated in time.
➋ “Wave” means Oscillatory and “let” means Quick decaying.
➌ Difference between wave and wavelet :-
Wavelet Transform
➊ Wavelet transform decomposes a signal into a set of basis functions.
 Wavelets are obtained from a single prototype wavelet y(t) called mother wavelet by dilations and shifting
 Then what is DWT
Discrete wavelet transform (DWT), which transforms a discrete time signal to a discrete wavelet representation.
Equation of a discrete mother wavelet
Daubechies wavelet transform :-
➊ An orthonormal, compactly supported family of wavelets.
➋ Calculated using the scaling functions and wavelet functions.
➌ Is the default wavelet transform present in mat lab.

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to get information about speech recognition full report full report, ppt and related topic refer the page link bellow

http://studentbank.in/report-speech-reco...ull-report

http://studentbank.in/report-speech-reco...ull-report

http://studentbank.in/report-speech-reco...ort?page=2

http://studentbank.in/report-speech-reco...ort?page=2

http://studentbank.in/report-artificial-...ecognition

http://studentbank.in/report-speech-reco...ort?page=3
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