WindowedSinc

WindowedSinc is a software company that develops digital signal processing tools and reference implementations for audio, video, and communications applications. The company specializes in windowed sinc filters, a family of finite impulse response designs used for high-fidelity sample-rate conversion, anti-imaging reconstruction, and spectral analysis. Its products emphasize precise control over passband and stopband behavior through configurable windowing and polyphase architectures.

Founded in the early 2010s by engineers from academia and industry, WindowedSinc grew by releasing a mixture of proprietary libraries and openly licensed reference code, complemented by comprehensive documentation and tutorials. The company positions itself as a provider of reliable building blocks for developers, researchers, and educators.

Core offerings include the WindowedResampler library, which implements windowed-sinc-based resampling with polyphase decomposition and multiple window options such as Hann, Blackman, and Kaiser. The SincFilter toolkit covers FIR filter design, analysis, and visualization, including phase and group delay considerations. A real-time DSP engine targets desktop and embedded platforms, with language bindings for C++, Rust, and Python, and a plugin SDK for audio workstations.

Market reception cites WindowedSinc for its clear reference implementations and practical documentation. The company’s components are used in both commercial software and academic research, where they are appreciated for predictable performance and ease of integration. WindowedSinc also emphasizes community engagement, providing example projects, benchmarking datasets, and permissive licensing for non-commercial and open-source usage.

See also: Digital signal processing, sample-rate conversion, finite impulse response filters, window functions.