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- SMLib : Signal processing for Mapping -
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SMLib is an external objects library for PD (pure data). It complements PD
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with a set of objects for vector processing, vector analysis, vector
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synthesis, number stream analysis, number stream filters.
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I was missing objects that could do dsp-like operations on control signals.
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PD is event-driven by nature (except the dsp-objects and [delay], [metro],
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...). A slider that does not change does not transmit anything. Event-driven
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events can be sampled by eg. using a [float] with a [metro] on its main input,
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and a slider on its right inlet. SMLib has objects designed to process such
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streams. Eg. [lavg] is a leaky integrator, it smoothes abrupt changes. Leaky
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processes are interesting in mapping because our attention is also leaky.
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Eg. [hp] is a high-pass filter (just like [hp~]), and it only passes changes,
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and decays to zero when there are no changes. Likewise our attention shifts
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towards remarkable changes in our environment. You can detect 'events' in
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float streams with [threshold]. A vector is a list of floats.
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These objects are suitable for gesture and high-level music analysis
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This library is written by Johannes Taelman (johannes.taelman@rug.ac.be). The
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code is free+open (GNU GPL license). I have only tested/compiled the code on
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win32, but porting to linux or macOs should be easy.
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processing stream of floats (context) (float output)
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lstd leaky standard deviation
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decimator passes 1 in n input values
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threshold detection with hysteresis
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hip first order high-pass filter
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bp second order (resonant) high-pass filter
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analyzing stream of floats (vector output)
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lhist leaky histogram, clips samples
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lhisti leaky histogram, ignore samples
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itov bin index to value (for the histograms
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prevl previous floats in a list
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deltas difference between last float and
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immediate vector analysis (float output)
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vsum sum of vector elements
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vcog center of gravity
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vmax maximum and its location
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vmin minimum and its location
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vstd standard deviation
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vector processors (vector output)
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vv- vector substraction
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vvconv vector convolution
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vfmod floating point modulo
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vthreshold detections with hysteresises
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unit conversions on vectors
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vftom frequency to midi
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vmtof midi to frequency
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vector synthesis (vector output)
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linspace linearly spaced vector
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vector stream processing (vector output) (context)
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vdelta difference between successive vectors
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Requires PD on the win32 platform (for now). Put SMLib.dll in a directory in
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your PD path. Put the help patches in pd\doc\5.reference.
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Start PD with "-lib SMLib"
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Create an object [SMLib]
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Right-click on this object after creation. Choose help.
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This gives you the main SMLib patch with all objects and a brief explanation
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of them. Choose help for the objects to get details. Have a look at the
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example patches for design ideas.
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http://crca.ucsd.edu/~msp/software.html
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http://iem.kug.ac.at/pd/
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http://www.puredata.info
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README.txt
