Computationally Efficient Hammond Organ Synthesis
Computationally Efficient Hammond Organ Synthesis 14th International Conference on Digital Audio Effects (DAFx-11), Paris, France Jussi Pekonen, Tapani Pihlajamäki, and Vesa Välimäki (Poster presentation by Julian Parker) Department of Signal Processing and Acoustics Aalto University School of Electical Engineering Espoo, Finland September 20, 2011 Objective Create a digital model of the famous Hammond organ Image source: http://www.cameratim.com/reviews/ audio/hammond-123j3-organ/images/ hammond-123j3-organ.jpeg Properties Tone wheel synthesizer Timbre control via drawbars Leslie cabinet (rotating speaker units), important part of the sound! Computationally Efficient Hammond Organ Synthesis Pekonen, Pihlajamäki, & Välimäki (Parker) SPA @ Aalto ELEC 2/4 September 20, 2011 DAFx-11, Paris, France Implementation Organ Model Additive synthesizer (a few components) Components that are not heard not generated ⇒ Computational savings f0 0.5 × 1.5 1 2 3 5 4 6 8 × × × × × × × × + + + + + + + + “Key click” effect: Emulated with the sixth harmonic Computationally Efficient Hammond Organ Synthesis Pekonen, Pihlajamäki, & Välimäki (Parker) SPA @ Aalto ELEC 3/4 September 20, 2011 DAFx-11, Paris, France Implementation Leslie Cabinet Model Frequency and amplitude modulation Modulator 1 Input HPF SDF1 AM1 LPF SDF2 AM2 + Output Modulator 2 Frequency modulation with short spectral delay filters (SDFs) LIVE DEMO! Computationally Efficient Hammond Organ Synthesis Pekonen, Pihlajamäki, & Välimäki (Parker) SPA @ Aalto ELEC 4/4 September 20, 2011 DAFx-11, Paris, France
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