PT_Enhancement_LEE

PT_Enhancement_LEE - 1 Spe c t r um Enhanc e me nt Spe e c...

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Unformatted text preview: 1 Spe c t r um Enhanc e me nt Spe e c h Pr oc e s s i ng De c . 11, 2006 YOUNG- CHAN LEE 2 Spe ct r um e nhance me nt Goa l : f i nd noi s e l e s s s pe c t r um f or s pe e c h s i gna l Re ga r d c or r upt e d s i gna l c ons i s t of noi s e , pur e s i gna l a nd ba c kgr ound noi s e . i i i i where x corrupted signal y pure signal c noise b background noise i i i i x c y b = + ( ) ( ) i i e x e y = Sa me s pe c t r um c ompone nt s 3 Equat i on- me t hod( 1) Spe c t r um e nha nc e me nt ( ) ( ) , ( ) w here , , , constant i i i i i i N M i i i j i j i i i j M j i i i i i i x e i G E N f F c y e i G c y c y c y F x c y f c y estim ate of background and F α β γ α β γ α β γ + + = = - = + + + = + + + = = = Gl oba l i nf or ma t i on Loc a l i nf or ma t i on Es t i ma t e of ba c kgr ound 4 Spe ct r ogr am 1 2 3 4 5 6-2 2 Time (s) SPEECH Frequency [Hz] Time [s] SPECTROGRAM 1 2 3 4 5 6 2000 4000 Frequency [Hz] Time [s] ENHANCED SPECTROGRAM 1 2 3 4 5 6 2000 4000 10 where 0.01/128 0.01/10 1 10 F α β γ = = = = 5 Ne w Equat i on – me t hod- ( 2) ( ) ( ) , ( ) where , , , constant i i i i i i i i i i i i i i i N M i i i i i j i j i j M j i i i i i i x x x x e i E N f F c y c y c y c y e i c y F c y c y x c y f c y estimateof background and F α β γ γ α β α β γ + + = =- = + + + = + + + = = = Pa r t – 1 ( Gl oba l e ne r gy) Pa r t – 2 ( l oc a l e ne r gy) Pa r t – 3 ( Ba c kgr ound e s t i ma t e ) Pa r t – 4 ( Fl oor ) Ana l ys i s of e a c h c ompone nt a nd f i nd pa r a me t e r s 6 Addi t i ve Noi s e Suppr e s s i on 2 ˆ (1 exp( )) , where isinputand isbackgroundestimate. i i i i i i i i y x x x x x f f α = - - = Suppr e s s noi s e c ompa r e t o s pe e c h s i gna l 500 1000 1500 2000 2500 3000 3500 4000 5 10 15 x 10 4 comparison of input and suppressed signal frequency[Hz] magnitude spectrum suppressed ˆ 0.1 α = 500 1000 1500 2000 2500 3000 3500 4000 5 10 15 x 10 4 comparison of input and suppressed signal frequency[Hz] magnitude ˆ 1 α = ˆ 10 α = 500 1000 1500 2000 2500 3000 3500 4000 5 10 15 x 10 4 comparison of input and suppressed signal frequency[Hz] magnitude 7 Par t - 1 Spe c t r um a nd gl oba l e ne r gy 1 ( ) where constant i i i N i i i i i i i x c y e i E c y x c y α α α = = = = 500 1000 1500 2000 2500 3000 3500 4000 2000 4000 6000 8000 10000 12000 Spectrum and global energy frequency[Hz] magnitude spectrum global energy 8 Par t - 2 Spe c t r um a nd l oc a l e ne r gy 2 ( ) where is constant i i i M i i j i j j M j i i i i x c y e i N c y x c y β β β + + =- = = = 500 1000 1500 2000 2500 3000 3500 4000-2000 2000 4000 6000...
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PT_Enhancement_LEE - 1 Spe c t r um Enhanc e me nt Spe e c...

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