2015-10-18 23:06:39 -07:00
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# random dsp code
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it's a bunch of half-baked python code that's kinda handy.
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don't expect commits, docs, or comments to be any verbose.
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2018-02-21 04:04:24 -08:00
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feel free to modify and adapt the [autoupdate](autoupdate)
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shell script for your own repos like this!
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2015-10-18 23:06:39 -07:00
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## the stuff
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* a basic BS.1770-3 normalization implementation
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— [bs.py](/lib/bs.py)
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2018-02-21 04:04:24 -08:00
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* biquad butterworth/chebyshev filters
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[(via DSPFilters)][dspf]
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2016-04-23 20:12:55 -07:00
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— [nsf.py](/lib/nsf.py)
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2015-10-18 23:06:39 -07:00
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2018-02-21 04:04:24 -08:00
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* modified bilinear transformation: s-plane to z-plane
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2015-10-18 23:06:39 -07:00
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— [planes.py](/lib/planes.py)
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* various functions for biquad filters
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2018-02-21 04:04:24 -08:00
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— [bq.py](/lib/bq.py)
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2015-10-18 23:06:39 -07:00
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2018-02-21 04:04:24 -08:00
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* some functions for state-variable filters
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[(via Raph Levien)][svf]
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2015-10-18 23:06:39 -07:00
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— [svf.py](/lib/svf.py)
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2018-02-21 04:04:24 -08:00
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* sine sweeps, and the Optimized Aoshima's Time-Stretched Pulse
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[(via here)][sweeps]
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2015-10-18 23:06:39 -07:00
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— [sweeps.py](/lib/sweeps.py)
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2018-02-21 04:04:24 -08:00
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* basic [cepstrum][cep] utilities like minimum-phase reconstruction
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[(via Julius Smith)][jos3]
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— [cepstrum.py](/lib/cepstrum.py)
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* utilities for magnitude plotting, including tilting and smoothing
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— [fft.py](/lib/fft.py) [smoothfft.py](/lib/smoothfft.py) [mag.py](/lib/mag.py)
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* a couple hard-coded polyphase halfband IIRs for nonlinear-phase resampling
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or approximating hilbert transforms
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(read more: [Olli Niemitalo][olli])
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— [piir.py](/lib/piir.py)
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* a dozen windowing functions and utility functions for constructing them
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— [windowing.py](/lib/windowing.py)
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2015-10-18 23:06:39 -07:00
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2018-02-21 04:04:24 -08:00
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* ad-hoc experiments with psychoacoustic equalization
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("neon pink" and other crap before i realized
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"grey noise" was the term i was looking for)
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— [data.py](/lib/data.py)
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2015-10-18 23:06:39 -07:00
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* miscellaneous matplotlib stuff
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— [plot.py](/lib/plot.py)
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* miscellaneous utility functions
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— [util.py](/lib/util.py) [wav.py](/lib/wav.py)
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2018-02-21 04:04:24 -08:00
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[dspf]: //github.com/vinniefalco/DSPFilters/
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[svf]: http://nbviewer.jupyter.org/github/google/music-synthesizer-for-android/blob/master/lab/Second%20order%20sections%20in%20matrix%20form.ipynb
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2015-10-18 23:06:39 -07:00
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[sweeps]: http://www.sound.sie.dendai.ac.jp/dsp/e-21.html
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2018-02-21 04:04:24 -08:00
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[cep]: //en.wikipedia.org/wiki/Cepstrum
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[jos3]: //ccrma.stanford.edu/~jos/fp/
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[olli]: http://yehar.com/blog/?p=368
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2015-10-18 23:06:39 -07:00
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2017-09-25 09:02:30 -07:00
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all wrapped up in a inconveniently named "lib" module!
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2015-10-18 23:06:39 -07:00
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## dependencies
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2017-09-25 09:02:30 -07:00
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python 3.5+
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2015-10-18 23:06:39 -07:00
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numpy scipy sympy matplotlib ewave
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usually run in an ipython environment.
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