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References: Filter Design Fundamentals

  1. Digital filter - Wikipedia - Surveys digital filter structures, transfer functions, difference equations, frequency response, implementation, and design considerations.

  2. Finite impulse response - Wikipedia - Explains FIR characteristics, convolution implementation, linear phase, stability, moving averages, and common design approaches.

  3. Infinite impulse response - Wikipedia - Covers recursive IIR structures, poles and zeros, stability, analog prototypes, computational efficiency, and phase behavior.

  4. Introduction to Digital Filters with Audio Applications - Julius O. Smith III - W3K Publishing - Smith’s transfer-function and audio-example approach makes poles, zeros, frequency response, and implementation audibly concrete.

  5. Understanding Digital Signal Processing (3rd Edition) - Richard G. Lyons - Pearson - Lyons’ practical diagrams and rule-of-thumb comparisons make FIR/IIR selection, moving averages, and frequency response approachable.

  6. Introduction to Digital Filters - DSPRelated - A gentle open treatment of FIR theory, examples, audio applications, and useful software starting points.

  7. SciPy Signal Processing - SciPy - Documents FIR and IIR design, frequency-response analysis, filtering, second-order sections, and window utilities.

  8. Introduction to Digital Filters - DSP Guide - Relates impulse, step, and frequency responses while contrasting convolution-based FIR and recursive IIR implementations.

  9. DSP 101 Part 1 - Analog Devices - Introduces FIR and IIR filters through practical comparisons with analog filtering and real-world sampled signals.

  10. Signals and Systems - MIT OpenCourseWare - Provides lectures, notes, and exercises connecting filtering specifications to convolution, frequency response, and system representations.