filtering.slides.printing.6 - Filtering Filtering...

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Filtering Filtering CS 450: Introduction to Digital Signal and Image Processing Bryan Morse BYU Computer Science Filtering Introduction Filtering Filtering : Altering a signal by multiplying each (complex) component F ( u ) in the frequency domain by a (complex) multiplier H ( u ) . Example: An equalizer for a stereo or other music system— you shape what happens to each frequency. Filtering Introduction Filtering Remember, H ( u ) is complex: ± Magnitude - multiplies the amplitude of each frequency by a certain amount ± Phase - shifts that frequency by some time or spatial offset ± Modulation filtering changes the magnitude (most common) ± Phase filtering changes the phase (less common) Filtering Introduction Common Forms of Filtering Described by what they do to the magnitude: Low-pass Keeping mainly low frequencies High-pass Keeping mainly high frequencies High-boost Boosting mainly high frequencies Band-pass Keeping mainly midrange frequencies Band-suppress Suppressing mainly midrange frequencies 20 40 60 80 100 120 0.2
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filtering.slides.printing.6 - Filtering Filtering...

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