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Spectral subtraction algorithm and optimize Wanfeng Zou 7/3/2014.

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Presentation on theme: "Spectral subtraction algorithm and optimize Wanfeng Zou 7/3/2014."— Presentation transcript:

1 Spectral subtraction algorithm and optimize Wanfeng Zou 7/3/2014

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

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

4 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)

5 Original signal

6 Only noise signal

7 General Spectral subtraction algorithm

8 Improve spectral subtraction algorithm α is spectral subtraction correction factor, change the 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.

9 Improve spectral subtraction algorithm

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

11 Thank you !


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