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ednan
Joined: 13 Feb 2007
Posts: 131
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 02 Aug 2008 17:05 Spectral Subtraction |
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Hello to all members....
i need help in ..Speech Enhancement Using Spectral Subtraction method
my question is ...
(i) What are steps using to do Spectral Subtraction Method ......
(ii) if we use Function for Spectral Subtraction
[OUT,PO]=SS(IN,FS,P)
Please tell me wat is P and PO...
please if ani 1 know about this ...plz help me...
Regards
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Eugen_E
Joined: 29 Nov 2004
Posts: 329
Helped: 30
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| 02 Aug 2008 23:10 Re: Spectral Subtraction |
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You're talking about Matlab?
Spectral subtraction means:
- obtaining the steady spectrum, without useful signal present - this can be made by long time spectrum averaging;
- subtracting the steady spectrum from the instantaneous spectrum.
Thus the noise floor and other continous unusefull signals are eliminated.
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ednan
Joined: 13 Feb 2007
Posts: 131
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| 03 Aug 2008 9:29 Re: Spectral Subtraction |
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Yes m Taking about MATLAB ...i Cant Undersyand that Code ...
%SPECTRALSUBTRACTION performs speech enhancement using spectral subtraction [OUT,PO]=SS(IN,FS,P)
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% implementation of spectral subtraction algorithm
% noisy speech IN with fs=FS enhanced by SS and returned in OUT, P is the algorithm parameters as bellow:
% algorithm parameters: t* in seconds, f* in Hz, k* dimensionless
% 1: tg = smoothing time constant for signal power estimate (0.04): high=reverberant, low=musical
% 2: ta = smoothing time constant for signal power estimate used in noise estimation (0.1)
% 3: tw = fft window length (will be rounded up to 2^nw samples)
% 4: tm = length of minimum filter (1.5): high=slow response to noise increase, low=distortion
% 5: to = time constant for oversubtraction factor (0.0
% 6: fo = oversubtraction corner frequency (800): high=distortion, low=musical
% 7: km = number of minimisation buffers to use (4): high=waste memory, low=noise modulation
% 8: ks = oversampling constant (4)
% 9: kn = noise estimate compensation (1.5)
% 10:kf = subtraction floor (0.02): high=noisy, low=musical
% 11:ko = oversubtraction scale factor (4): high=distortion, low=musical
Added after 1 minutes:
Please tell me about P which is the Parmater ...and about PO
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ednan
Joined: 13 Feb 2007
Posts: 131
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| 04 Aug 2008 21:19 Re: Spectral Subtraction |
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| Please please help me ...
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