ecen4763.notes.23

ecen4763.notes.23 - To save computation Ex : Fast Fourier...

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1 ECEN 4763: Introduction to Digital Signal Processing Fall 2009 Lecture 23: Friday, October 12, 2009 Multirate DSP, Part I 1. Why do multirate DSP? 2. Downsampling for rate reduction 3. Downsampling example
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2 Multirate DSP, Part I 1. Why do multirate DSP? 2. Downsampling for rate reduction 3. Downsampling example Why do multirate DSP? • To change the rate of signals – Rate = sampling rate Ex : Change 44 kHz to 22 kHz wave files Ex : Change 24 fps to 30 fps video – Rate = size (for finite-length signals) Ex : Change 512×512-pixel to 32×32-pixel image
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Unformatted text preview: To save computation Ex : Fast Fourier transform Ex : Fast wavelet transform (used in JPEG2000) 3 Multirate DSP, Part I 1. Why do multirate DSP? 2. Downsampling for rate reduction 3. Downsampling example Downsampling 4 Downsampling 5 Useful equation: N roots of unity 6 7 Before After Downsampling 8 Downsampling Downsampling can give rise to aliasing 9 Multirate DSP, Part I 1. Why do multirate DSP? 2. Downsampling for rate reduction 3. Downsampling example From Homework 4, Fall 2008...
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This note was uploaded on 12/26/2010 for the course ECEN 4763 taught by Professor Staff during the Fall '08 term at Oklahoma State.

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ecen4763.notes.23 - To save computation Ex : Fast Fourier...

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