Life & fun · November 17, 2025
KFR 7 – major update for C++ DSP library
Key additions: RVV SIMD support for RISC-V devices. Elliptic IIR filter design and zero-phase IIR filtering via filtfilt. Audio reading/writing completely reworked and now supports WAV, W64, RF64/BW64, AIFF, FLAC, CAF, ALAC, MP3, and raw formats. New high-level Audio module for multichannel processing. There are also performance improvements since KFR6 for DFT (up to 40% on ARM) and matrix transpose (up to 30%).
Does the same job
all alternatives →- L1Libsoundio 1.0.0 – cross-platform audio input and output2015 · libsound.io · ▲129
- WDWeb DSP audio editor2018 · dsp.audio · ▲133
- T3TB-303 Synth, Drum Machine and Sequencer in Web Audio2016 · errozero.co.uk · ▲238
- SLSOUL Language 1.0 – A platform for writing and running audio code2021 · soul-lang.github.io · ▲119
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
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