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DSP Filters is a library desigend to harnesses the power of C++ templates to solve a useful problem in digital signal processing: the realization of multichannel IIR filters of arbitrary order and prescribed specifications with various properties such as Butterworth, Chebyshev, Elliptic, and Optimum-L (Legendre) responses.

Building on the work of cherished luminaries such as Sophocles Orfanidis, Andreas Antoniou, Martin Holters, and Udo Zolzer, this library harnesses the power of C++ templates to solve a useful problem in digital signal processing: the realization of multichannel IIR filters of arbitrary order and prescribed specifications with various properties such as Butterworth, Chebyshev, Elliptic, and Optimum-L (Legendre) responses. The library is provided under the MIT license and is therefore fully compatible with proprietary usage.

Classes are designed as independent re-usable building blocks. Use some or all of the provided features, or extend the functionality by writing your own objects that plug into the robust framework. Only the code that you need will get linked into your application.

Here's a list of features:

* Exclusive focus on IIR filters instead of boring FIR filters
* Complete implementation of all "RBJ Biquad" Cookbook filter formulas
* Butterworth, Chebyshev, Elliptic, Bessel, Legendre designs
* Low Pass, High Pass, Band Pass, Band Stop transformations
* Low, High, and Band Shelf filter implementations for most types
* Smooth interpolation of filter settings, pole/zeros, and biquad coefficients to achieve seamless parameter changes
* Representation of digital filters using poles and zeros
* Realization using Direct Form I, Direct Form II, or user provided class
* Fully factored to minimize template instantiations
* "Design" layer provides runtime introspection into a filter
* Utility template functions for manipulating buffers of sample data
* No calls to malloc or new, great for embedded systems
* No external dependencies, just the standard C++ library!
* Documentation!