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ate: Thu, 22 Apr 1999 02:52:42 GMT From: Allan Herriman <allan.herriman.hates.spam@fujitsu.com.au> Newsgroups: comp.dsp Subject: Re: DSP Tricks THIS WORK IS PLACED IN THE PUBLIC DOMAIN Name: Complex downconverters for signals at Fs/4 or 3Fs/4 Category: Hardware architecture Application: Use for … Continued

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

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

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

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

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

Name: Simultaneous parabolic approximation of sin and cos Category: Algorithmic Application: When you need both sin and cos at once, and you need ’em fast, and using multiplications and parabolic approximation is OK, try this. Possible applications are audio panning, … Continued

Subject: Re: DSP Tricks From: Allan Herriman Date: 1999/04/22 Newsgroups: comp.dsp THIS WORK IS PLACED IN THE PUBLIC DOMAIN Name: Filtering in QAM transmitters and receivers. When *NOT* to do what the textbooks tell you to do. Category: Hardware architecture, … Continued

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

by Rick Lyons Performing interpolation on a sequence of time-domain samples is an important (often used) process in DSP, and there are many descriptions of time-domain interpolation (a kind of curve fitting) in the literature and on the Internet. However, … Continued