Quadrature Signals: Complex, But Not Complicated

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Understanding complex numbers and quadrature signals is essential for understanding DSP at both a theoretical and a practical level. Yet this strange, complex subject (based on the admittedly imaginary construct of the square root of negative one!) is among the … Continued

Articles

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New virtually scaling free adaptive CORDIC rotator Windowing Functions Improve FFT Results Digital Signal Processor (Wikipedia) Time Stretching And Pitch Shifting of Audio Signals

How to Implement IIR Filters

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Introduction The job of an IIR filter design program is to transform a filter specification into a corresponding set of IIR filter coefficients.  After that, the user is responsible for actually implementing the filter using the coefficients provided. Implementing an … Continued

DSP on Wikipedia

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Links to Digital Signal Processing (DSP) pages on Wikipedia, organized by subject DSP Digital Signal Processing Sampling Aliasing Anti-aliasing filter Ideal sampler Nyquist frequency Nyquist rate Nyquist–Shannon sampling theorem Quantization Reconstruction filter Sample and hold Sampling rate Zero-order hold Data … Continued

Miscellaneous Tricks

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Complex Downconverters for Signals at Fs/4 or 3Fs/4 Sinusoidal Tone Generator Fast Floating Point to Mu-Law Conversion Fixed-Point DC Blocking Filter with Noise-Shaping Dealing With Propagating Truncation Errors

How to Generate White Gaussian Noise

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by Matt Donadio White Gaussian Noise (WGN) is needed for DSP system testing or DSP system identification. Here are two methods for generating White Gaussian Noise. Both rely on having a good uniform random number generator. We will assume that … Continued

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