https://audio.dev/ -- @audiodevcon
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PolyBLEP & PolyBLAMP Demystified - Nis Wegmann - ADCx Copenhagen 2026
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In this presentation from the Audio Developer Conference, Nis Wegmann demystifies the mathematical concepts behind PolyBLEP (polynomial band-limited step) and PolyBLAMP (polynomial band-limited ramp) techniques used to suppress aliasing in virtual analog oscillators. Geometric waveforms such as square, sawtooth, and triangle waves naturally produce harsh digital aliasing due to infinite harmonics folding back over the Nyquist frequency. Wegmann demonstrates the audible difference between naive signal generation and alias-free synthesis using these DSP correction methods.
Rather than relying on computationally heavy oversampling and filtering, the BLEP and BLAMP algorithms resolve aliasing by localizing corrections directly at the discontinuities of the waveform. Wegmann breaks down the relationship between these functions, tracing their roots back to the integration of a band-limited impulse. To transition these theoretical concepts into a highly efficient runtime implementation, the session explains how to approximate the infinite sinc function using cubic Catmull-Rom Hermite splines.
The talk concludes with a fully functional, self-contained C++ code walkthrough demonstrating a real-time anti-aliased oscillator. Wegmann outlines the step-by-step logic of tracking sub-sample discontinuities, shifting the correction polynomial, and applying it directly to a running sample buffer. This presentation provides audio developers and virtual analog designers with a clear, practical roadmap to deriving and programming efficient polynomial-based oscillators.
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ADC is an annual event celebrating all audio development technologies, from music applications and game audio to audio processing and embedded systems. ADC’s mission is to help attendees acquire and develop new audio development skills, and build a network that will support their audio developer career.
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Streamed & Edited by Digital Medium Ltd: https://online.digital-medium.co.uk
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Organized and produced by JUCE: https://juce.com/
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Special thanks to the ADC Team:
Bence Kovacs
Martin Swanholm
Sophie Carus
Derek Heimlich
Andrew Kirk
Bobby Lombardi
Tom Poole
Ralph Richbourg
Jim Roper
Jonathan Roper
Prashant Mishra
#adc #audiodev #dsp #audio #conferenceaudio #audioprocessing #audioproduction #audioprogramming #sound #music #musictech #soundtech #audiotech #audiotechnology
