![Energy equation for a discrete-time signal.](https://www.wavewalkerdsp.com/wp-content/uploads/2023/05/energy_equation-150x150.png)
Power and Energy in Discrete-Time Signals
December 1, 2023
![Figure 2: The periodicity of a complex sinusoid can be seen easier in three dimensions.](https://www.wavewalkerdsp.com/wp-content/uploads/2023/03/WhyDoesTheDFTNeedWindowingFunctions_complexSinusoidCircular-150x150.png)
Why Does the DFT Need Windowing Functions?
September 1, 2023
![Reducing the gain avoids ADC saturation. The dynamic range is improved and the signal can be seen.](https://www.wavewalkerdsp.com/wp-content/uploads/2022/03/lessGain-150x150.png)
ADC Saturation: Why More Gain Isn’t Always Better
May 18, 2022
![](https://www.wavewalkerdsp.com/wp-content/uploads/2022/04/DerivativeOfSine-150x150.png)
Derivative of Sine and Cosine Using Euler’s Formula
April 6, 2022
![](https://www.wavewalkerdsp.com/wp-content/uploads/2022/03/eBookCover-150x150.png)
The Brand New Wave Walker DSP eBook!
March 21, 2022
![Figure 3: The complex sinusoid e(j2 pi (2/4) n) only contains energy at X[2].](https://www.wavewalkerdsp.com/wp-content/uploads/2022/01/DFTFrequencyResolutionExplained_4DFT_Freq2-150x150.png)
DFT Frequency Resolution Explained
March 16, 2022
![](https://www.wavewalkerdsp.com/wp-content/uploads/2022/02/Magnitude-150x150.png)
Can the Fourier Transform Magnitude Be Negative?
February 16, 2022
![A radio receiver acts like an assembly line. Samples are held in a tapped delay line, operated on, and then passed along to the next operation.](https://www.wavewalkerdsp.com/wp-content/uploads/2021/12/radioAssemblyLine-150x150.png)
Minimizing Filter Length: Explaining Why
February 9, 2022
![Why are filters used in DSP? To combine, or synthesize, multiple signals into one.](https://www.wavewalkerdsp.com/wp-content/uploads/2021/12/combineSignals-2-150x150.png)
Why are Filters used in DSP?
January 26, 2022
![Figure 5: The impulse response of an odd length SRRC allows for optimal sampling by being able to select the peak at n=0. An even length SRRC filter does not.](https://www.wavewalkerdsp.com/wp-content/uploads/2021/11/oddLengthFilters_SRRCImpulseResponses-150x150.png)
Why an FIR Filter Should Have an Odd Length
December 29, 2021