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Published byByron Dawson Modified over 8 years ago
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Spectral subtraction algorithm and optimize Wanfeng Zou 7/3/2014
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Summary A speech enhancement algorithm was developed based on spectral subtraction to reduce the disturbances of noise on speech communications.
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Experimental Tools Using MATLAB: high-level language and interactive environment for numerical computation, visualization, and programming.
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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)
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Original signal
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Only noise signal
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General Spectral subtraction algorithm
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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.
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Improve spectral subtraction algorithm
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Conclusion spectral subtraction algorithm more effectively eliminates musical noise and improves the signal to noise rates without significantly impairing the speech intelligibility.
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Thank you !
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