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Dialing Tone Recognition PowerPoint PPT Presentation


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Dialing Tone Recognition. Samuel Simmons Justry Weir Eduardo Moya Abubakr Mohamed. Dual Tone Multi Frequency. Theory. Record a series of dialing tones Input signal to Matlab Play sound file Perform FFT Represent signal graphically Output numbers dialed. How it Works. Recording

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Dialing Tone Recognition

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Dialing tone recognition l.jpg

Dialing Tone Recognition

Samuel Simmons

Justry Weir

Eduardo Moya

Abubakr Mohamed


Dual tone multi frequency l.jpg

Dual Tone Multi Frequency


Theory l.jpg

Theory

  • Record a series of dialing tones

  • Input signal to Matlab

  • Play sound file

  • Perform FFT

  • Represent signal graphically

  • Output numbers dialed


How it works l.jpg

How it Works

  • Recording

  • Run Program

  • Input file name of recording

  • Program runs / runtime

  • Displays number and graphs


Experimental setup l.jpg

Experimental Setup

  • Hardware

  • Software

  • Types of different sound scenarios


Data results l.jpg

Data Results

  • Higher quality signal with little noise

  • Noise and signal of similar power

  • Poor signal quality with noise


Fft plots ideal signal l.jpg

FFT Plots (Ideal Signal)


Spectrogram ideal signal l.jpg

Spectrogram (Ideal Signal)


Conclusion l.jpg

Conclusion

  • Equipment

  • Environment

  • Run Time

  • Efficiency


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