lecture 31 - 1 Summary of Lecture #31 11/05/2010 HP filter...

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Unformatted text preview: 1 Summary of Lecture #31 11/05/2010 HP filter realization based on brickwall spec. HP brickwall spec. LP brickwall spec. Find n and c from p , s , A max and A min . Construct a LP filter LP filter HP filter An example General-purpose 2nd-order RC active filters Why? Kerwin-Huelsman-Newcomb filters (KHN filters) Summing circuits Difference circuits Integrator circuits 1 3 Brickwall specification for LP filters p : Pass band edge frequency A max : Max. atten. (loss) |H(j ) | in the pass band s : Stop band edge frequency A min : Min. atten. (loss) |H(j )| in the stop band Filter order n ? Cutoff frequecny c ? A max p s A min 4 min max 0.1A 2n s 0.1A p 10 1 ( ) 10 1 - - max min 2 2n 2n p 2n 2n s c,min c,max 0. n c 1A 0.1A 10 1 10 1 = - = - Eq. (19.8) Eq. (19.7) A max A min p s min max 0.1A 10 0.1A s 10 p 10 1 log 10 1 n log ( )-- 5 Brickwall specification for HP filters p : Pass band edge frequency A max : Max. atten. (loss) |H(j ) | in the pass band s : Stop band edge frequency A min : Min. atten. (loss) |H(j )| in the stop band Filter order n ? Cutoff frequecny c ? p s A min A max s p c HP brickwall spec. LP brickwall spec. 6 HP p HP = p p p HP 1 = = p s s HP = p 3 dB c p s 3 33 dB cutoff point c = 1 ? LP 7 min max 0.1A 2n s 0.1A p 10 1 ( ) 10 1 - - max min 2 2n 2n p 2n 2n s c,min c,max 0....
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lecture 31 - 1 Summary of Lecture #31 11/05/2010 HP filter...

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