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Speech Recognition through Neural Networks. By Mohammad Usman Afzal Mohammad Waseem. Introduction.

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Speech Recognition through Neural Networks


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    1. Speech Recognition through Neural Networks By Mohammad Usman Afzal Mohammad Waseem

    2. Introduction • Speech Recognition is a process by which a computer maps an acoustic speech signal to text. Speech recognition has several stages. Its stages involve digital sampling of speech, acoustic signal processing and generating coefficients. The final stage is the recognition of phonemes, groups of phonemes and words. Multi Layered Feed Forward Perceptron Neural Network is used to generate output.

    3. Speech Production

    4. Speech Recognition Techniques • Feature Extraction • Artificial Intelligence • Pattern Recognition

    5. System Overview

    6. Speech Recognizer

    7. Digitization of speech • Recording the sound • Analog to Digital converter • Sampling and Quantization

    8. Filtering the Signal • Aliasing • Eliminate the signal over half the sampling frequency (that is SF/2) • Eliminating Pure Noise and Silence • Pure Noise and Silence is eliminated using Zero Crossing Rate (ZCR) and Power of the signal

    9. Classification of Signal

    10. Coefficients Measurement • Need of Coefficients • To get rid of a lot of digital signal data • Advantage of LP Coefficients • Applicable to time domain as well as frequency domain

    11. LP Coefficients

    12. Feed Forward Perceptron Neural Networks • Input Layer • 8 LP Coefficients fed to the input layer • Hidden Layer • Output Layer • Generates the output according to the weights assigned

    13. Neural Network

    14. Future Work • Complete Urdu Speech Recognizer • Interface with an Urdu Editor • Interface with Urdu to English Translator