Wave Walker DSP

DSP Algorithms for RF Systems

DSP: Math

Figure 4: The discrete Fourier transform (DFT) of a complex sinusoid with frequency 0.57pi (zoom view).

Discrete Fourier Transform (DFT) of Complex Sinusoid

May 1, 2023

Figure 3: Increasing the delay M increases the number of teeth in the comb filter and reduces their width. Note that the magnitude has been normalized to 0 dB gain at omega=0.

Comb Filter Introduction and Analysis

March 1, 2023

Figure 1: Magnitude of the frequency response for the band pass single pole IIR filter.

Band Pass Single Pole IIR Filter Design

February 1, 2023

Figure 2: Complex frequency shifting can result in aliasing if the frequency response overlaps the half sampling rate.

Complex Frequency Shifting in Discrete Time

January 1, 2023

Figure 1: Complex frequency shifting in the frequency domain.

Complex Frequency Shifting in Continuous Time

December 1, 2022

Figure 1: The frequency response of the ideal low pass filter (LPF) for omega c = 1/8.

Deriving the Ideal Low Pass Filter (LPF)

October 1, 2022

Figure 3: Comparing a moving average filter N=8 with the single pole IIR filter approximation.

Single Pole IIR Filter: Substitute for Moving Average Filter

August 10, 2022

Figure 3: A semilog plot on y for x and 10^x.

Explaining Logarithms, Exponents and Base Numbers With Plots

July 27, 2022

Easy Guide to Logarithms and Decibels

July 20, 2022

Figure 2: The magnitude-squared of the boxcar window frequency response.

Fourier Transform of the Boxcar Window

July 13, 2022

God, the Lord, is my strength; he makes my feet like the deer’s; he makes me tread on my high places. Habakkuk 3:19

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