MATLAB Implementation of Digital Down-Conversion with Filter Code Examples
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This article provides a comprehensive guide to implementing digital signal down-sampling using MATLAB. We demonstrate practical code implementations for three essential filter types: Cascaded-Integrator-Comb (CIC) filters, Half-Band (HB) filters, and Finite Impulse Response (FIR) filters. The discussion begins with fundamental concepts of digital signal processing and the rationale behind sample rate reduction. Each filter section includes detailed explanations of operational principles, typical applications, and corresponding MATLAB code snippets highlighting key functions like cicFilter for multi-stage decimation, halfBandDesign for efficient symmetric filtering, and fir1 for window-based FIR design. The final section integrates these components into a complete down-sampling pipeline, showcasing how to cascade filters optimally while maintaining signal integrity through proper anti-aliasing techniques and frequency response validation.
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