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

WanfengZou

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

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


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


Only noise signal


General 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 algorithm


Conclusion

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


Thank you !


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