Spectral subtraction algorithm and optimize
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Spectral subtraction algorithm and optimize. Wanfeng Zou 7/3/2014. Summary. A speech enhancement algorithm was developed based on spectral subtraction to reduce the disturbances of noise on speech communications. Experimental Tools.

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Spectral subtraction algorithm and optimize

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Spectral subtraction algorithm and optimize

Spectral subtraction algorithm and optimize

WanfengZou

7/3/2014


Summary

Summary

  • A speech enhancement algorithm was developed based on spectral subtraction to reduce the disturbances of noise on speech communications.


Experimental tools

Experimental Tools

  • Using MATLAB: high-level language and interactive environment for numerical computation, visualization, and programming.


Experimental objects

Experimental objects

  • clear speech signal: 11.wav

  • Voice Signal with noise: 12.wav

    by adding a sine wave noise signal (0.5 amplitude and 1000Hz frequency)


Original signal

Original signal


Only noise signal

Only noise signal


General spectral subtraction algorithm

General Spectral subtraction algorithm


Improve spectral subtraction algorithm

Improve spectral subtraction algorithm

  • α is spectral subtraction correction factor, changethe value of α will further enhance the signal to noise ratio;

  • ß as spectral subtraction noise figure, its role is to reduce the noise power spectrum, modify the coefficient of ß would serve to reduce noise and highlight the speech spectrum.


Improve spectral subtraction algorithm1

Improve spectral subtraction algorithm


Conclusion

Conclusion

  • spectral subtraction algorithm more effectively eliminates musical noise and improves the signal to noise rates without significantly impairing the speech intelligibility.


Thank you

Thank you !


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