In The Name of God The Compassionate The Merciful.

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Presentation transcript:

In The Name of God The Compassionate The Merciful

Wavelet applications for Larynx Disorders Diagnosis

Introduction What is Larynx?

Speech How do we speak? Speaking is made up of two mechanical actions called Phonation and Articulation

Common Larynx Disorders  Muscle Tension Dysphonia (MTD)  Vocal Tremor  Vocal Fold Paralysis

Other Common Disorders  Laryngeal Cancer  Edema  Nodules  Polyp

Voice Characteristics  Amplitude  Frequency  Energy  Entropy  Fractal Dimension

Amplitude Maximum amplitude to Minimum amplitude ratio

Energy Total Energy Energy in Frames

Energy Application Total Energy Noise Test Signal to Noise Ratio( Future Use) Energy in Frames Recording Environment Characteristics

Entropy  Shannon Entropy  p-Norm Entropy  log-Energy Entropy ✓

Fractal Dimension N ∆ is the number of times the signal sign is changed.

Signal The main signal is a 3-second.wav file in which the user simply says “a”

Basic Process 1- Chopping the Signal between two points 2- Segmenting the Chopped Signal

FIR Filters x(n) y(n) Z-1Z-1 Z-1Z-1 Z-1Z-1 gain x(n-1)x(n-k) x(n-(N-1)) a0a0 akak a1a1 a N-1 +++

Filters Coefficients MATLAB Coefficients for db4 Simply Type: fname=‘db4’; LP=dbwavf(fname) HP(k)=(-1) k ×LP(K-1-k) WLP(k)=LP(K-1-k) WHP(k)=HP(K-1-k)

Wavelets What are Wavelets? Wavelets are mathematical functions that cut up data into different frequency components, and then study each component with a resolution matched to its scale.

Wavelet Packets Wavelet packets are particular linear combinations of wavelets.

Applied Wavelet Packet Input Signal DownSample LPF HPFLPF HPF LPF

Feature Extraction Energy Entropy Fractal Dimension

Applied Wavelet Packet Input Signal DownSample LPF HPF LPF HPF

Best Features Vectors 0 to 3132 to Members 0 to 31 Band 6 Entropy Members 16 to 31 Band 5 Entropy Total Fractal Dimension First Band, Branch 0 Fractal Dimension First Band, Branch 1 Fractal Dimension

Diagnosis Block W and B are generated from Genetic Algorithm methods

Test Program (Normal)

Test Program (Pathologic)