(2) Approximations of ideal low-pass filter (with delay)

Numeric cutoff frequency 

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Desired frequency response 

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Corresponding ideal impulse response 

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Approximate ideal filter (L = 21)

Impulse response 
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Approximate ideal filter frequency response 
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Approximate ideal filter (L = 41)

Impulse response 
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Approximate ideal filter frequency response 
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Approximate ideal filter (L = 101)

Impulse response 
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Approximate ideal filter frequency response 
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Converted by Mathematica      March 25, 2003