A C++ template library for designing and implementing multichannel IIR filters with various response types and seamless parameter interpolation.
DSPFilters is a C++ template library for digital signal processing that specializes in designing and implementing multichannel Infinite Impulse Response (IIR) filters. It solves the problem of scarce publicly available source code for high-order IIR filters by providing a comprehensive collection of reusable classes supporting various filter types like Butterworth, Chebyshev, and Elliptic, with seamless parameter interpolation for real-time audio applications.
Audio plugin developers, VST synthesizer coders, embedded systems engineers working on audio processing, and students or professionals studying C++ or digital signal processing who need practical IIR filter implementations.
Developers choose DSPFilters for its exclusive focus on IIR filters, complete implementation of all RBJ Biquad Cookbook formulas, and its modular, dependency-free design that minimizes template instantiations and avoids dynamic memory allocation, making it ideal for performance-critical and embedded applications.
A Collection of Useful C++ Classes for Digital Signal Processing
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Supports Butterworth, Chebyshev, Elliptic, Bessel, and Legendre filter types, offering a wide range of responses for precise audio processing as detailed in the README.
Implements smooth interpolation of filter settings and coefficients, enabling click-free audio processing during real-time parameter changes, a key feature highlighted for audio plugins.
Has no external dependencies and avoids dynamic memory allocation, making it ideal for embedded systems and performance-critical applications without malloc/new calls.
Built as reusable C++ classes that allow developers to link only necessary components, minimizing code bloat and enhancing flexibility, as emphasized in the library's philosophy.
Exclusively focuses on IIR filters, admitting to ignoring 'boring FIR filters,' which limits its use for projects requiring finite impulse response designs.
Heavy use of C++ templates can lead to difficult-to-debug compile errors, increased compilation times, and a steeper learning curve, especially for those new to template metaprogramming.
The demonstration program requires the separately licensed Juce framework, adding complexity for users wanting to explore examples without investing in Juce.