Voice Technologies

  1. Digital Signal Processing for Speech
    1. Time-Domain Analysis
      1. Signal Characteristics
        1. Zero-Crossing Rate
          1. Short-Term Energy
            1. Autocorrelation Function
              1. Peak Detection
              2. Windowing Techniques
                1. Frame-Based Processing
                  1. Window Functions
                    1. Overlap-Add Method
                      1. Edge Effects
                      2. Voice Activity Detection
                        1. Energy-Based Methods
                          1. Spectral-Based Methods
                            1. Model-Based Approaches
                              1. Performance Evaluation
                            2. Frequency-Domain Analysis
                              1. Fourier Analysis
                                1. Discrete Fourier Transform
                                  1. Fast Fourier Transform
                                    1. Short-Time Fourier Transform
                                      1. Spectral Resolution
                                      2. Spectral Representation
                                        1. Power Spectral Density
                                          1. Magnitude and Phase Spectra
                                            1. Spectrograms
                                              1. Mel-Scale Representation
                                              2. Cepstral Analysis
                                                1. Cepstrum Definition
                                                  1. Quefrency Domain
                                                    1. Homomorphic Processing
                                                      1. Pitch Detection Applications
                                                    2. Feature Extraction Methods
                                                      1. Mel-Frequency Cepstral Coefficients
                                                        1. Mel-Scale Filterbank
                                                          1. DCT Transformation
                                                            1. Feature Normalization
                                                              1. Dynamic Features
                                                              2. Linear Predictive Coding
                                                                1. All-Pole Model
                                                                  1. Autocorrelation Method
                                                                    1. Covariance Method
                                                                      1. Reflection Coefficients
                                                                      2. Perceptual Linear Prediction
                                                                        1. Auditory Model Integration
                                                                          1. Critical Band Analysis
                                                                            1. Intensity-Loudness Conversion
                                                                            2. Advanced Features
                                                                              1. Delta and Delta-Delta Coefficients
                                                                                1. Spectral Centroid
                                                                                  1. Spectral Rolloff
                                                                                    1. Chroma Features
                                                                                  2. Audio Enhancement
                                                                                    1. Noise Reduction Techniques
                                                                                      1. Spectral Subtraction
                                                                                        1. Wiener Filtering
                                                                                          1. Adaptive Noise Cancellation
                                                                                            1. Multi-Band Processing
                                                                                            2. Echo and Reverberation Control
                                                                                              1. Acoustic Echo Cancellation
                                                                                                1. Adaptive Filtering
                                                                                                  1. Double-Talk Detection
                                                                                                    1. Residual Echo Suppression
                                                                                                    2. Signal Normalization
                                                                                                      1. Amplitude Normalization
                                                                                                        1. Cepstral Mean Normalization
                                                                                                          1. Variance Normalization
                                                                                                            1. Histogram Equalization

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                                                                                                        2. Fundamentals of Sound and Speech

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                                                                                                        4. Automatic Speech Recognition