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Voice Activated Calculator

Voice Activated Calculator

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Voice Activated Calculator

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  1. Voice Activated Calculator Shuab Khan Siddharth Yereddi

  2. Outline • Objectives • Design • Tests • Challenges • Conclusions

  3. Why Voice Activated? • Convenient • Marketable Consumer Device • Way of the Future • Applications

  4. Project Objectives • Speaker Independent • Performs Basic Calculations • Works in Natural Environment

  5. Design • Pre-filter and Preamplifier • Speech analysis on Digital Signal Processor (DSP) • Calculations on PIC microcontroller • Output displayed on LCD

  6. Microphone (Input) Analog Filter (90Hz – 5 kHz) Amplifier Gain Factor: 450 V/V Speech Detection and Recognition (DSP) Digital Filter (300Hz – 5kHz) (DSP) PIC Microcontroller LCD Display Realtime System

  7. Testing

  8. Preamplifier Test Measured Gain = 450 V/V

  9. Prefilter Simulated Frequency Response 6 kHz [cutoff]

  10. Pre-Filter Test – 2V input

  11. Digital Highpass Filter

  12. Digital Lowpass Filter

  13. Endpoint Detection

  14. Noisy Signal

  15. Accuracy vs Noise

  16. Anagrams • Spectrum ------> Cepstrum • Filtered ------> Liftered • Frequency ------> Quefrency

  17. Speech Recognition – MFCC’s

  18. Speech Recognition - Liftering

  19. Speech Recognition – LPCC’s

  20. TI Fixed Point DSP

  21. Issues on DSP • Memory limit • Overflow handling • Quantization Errors • Processing Time • Environment Noise Level

  22. Future Developments • Floating Point DSP • External Memory Chip • Larger Training Data

  23. Questions??? ?