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Applied DSP No. 7: The Convolution Theorem
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Applied DSP No. 6: Digital Low-Pass Filters
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why it works 21
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Understanding the Z-Plane
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8. IIR Filters - Infinite Impulse Response - Digital Filter Basics
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The Mathematics of Signal Processing | The z-transform, discrete signals, and more
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FIR Filter Design and Software Implementation - Phil's Lab #17
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