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Computing FFT Twiddle Factors [Matlab]
This text, figures, and code snippet are also available in downloadable PDF format Typical applications of an N-point radix-2 FFT accept N x(n) input time samples and compute N X(m) frequency-domai...
posted by Rick Lyons on Nov 28 2011
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Shelving Filter Design [Matlab]
This function will generate the coefficients for a single IIR biquad that is a "shelving" design. Wierldy enough, this filter type is not part of the standard Matlab filter design toolbox. ... posted by sparafucile17 on May 29 2011
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Generate ideal QPSK..64QAM symbol error rates (reference result) [Matlab]
Calculates the symbol error rate of QPSK/16QAM/64QAM/256QAM/1024QAM modulation for additive white Gaussian noise Output: ... posted by Markus Nentwig on Oct 21 2010
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Fitting Filters to Measured Amplitude Response Data Using invfreqz in Matlab [Matlab]
In the 1980s I wrote the matlab function invfreqz that implements a fast (FFT-based) equation-error method for recursive filter design given samples of the desired frequency response. This method des... posted by Julius Orion Smith III on Nov 8 2010
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Equal Loudness Curves (ISO226) [Matlab]
What is loudness? No, it is not the setting of your volume knob. In audio processing, loudness refers to a family of curves that generally describes how the the human ear perceives how "lo... posted by sparafucile17 on Jun 21 2011
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Spectrum analyzer [Matlab]
Determines the power spectrum, similar to a hardware measurement instrument The function takes an input signal and gives the two-sided power spectrum. Results are similar to what is obtained using a ... posted by Markus Nentwig on Dec 10 2011
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Resampling by Lagrange-polynomial interpolation [Matlab]
Calculates Lagrange-resampler coefficients and resamples an example signal.A Lagrange-resampler evaluates the unique n-th order polynomial that crosses through n+1 input samples. This code snippet map... posted by Markus Nentwig on Aug 17 2011
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GSM (GMSK) power spectrum equation [Matlab]
A simple, empirical model for the power spectrum shape of a GMSK-modulated GSM signal, generated according to 3GPP TS 45.004 section 2 on a signal stream without slot structure. The picture shows t... posted by Markus Nentwig on Sep 18 2011
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Peak/Notch Filter Design [Matlab]
This function will generate the coefficients for a single IIR biquad that is a "peak/notch" design. Wierldy enough, this filter type is not part of the standard Matlab filter design toolbox.&nbs... posted by sparafucile17 on May 21 2011
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Audio interpolation (Catmull-Rom/Cubic Hermite Spline) [Matlab]
Matlab example for Cubic Hermite Spline audio interpolation for sample-rate conversion or variable-speed playback. It is computationally efficient and audio quality is good.... posted by Markus Nentwig on Oct 24 2010
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