Source-filter

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Source-filterUsually called subtractiveOriginally implemented in analogue "modu ...A complex source passes through a filter
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Source-filter
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Usually called subtractive
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But this is something of a misnomer
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As the result can look like subtraction, but the process is not direct subtraction...
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And more than subtraction can occur
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Originally implemented in analogue "modular" synthesizers
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A complex source passes through a filter
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A spectrally rich source
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commonly of well known shapes like saw or square
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or noise
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Band-limited algorithms should be used
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To avoid aliasing
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Types
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Ideally band-limited oscillators
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Additive synthesis
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Discrete summation formulae
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The Synthesis of Complex Audio Spectra by Means of Discrete Summation Formulae
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Publication Type Journal Article
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Year of Publication 1976
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Authors Moorer, J. A.
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Journal Journal of the Audio Engineering Society
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https://ccrma.stanford.edu/papers/synthesis-of-complex-audio-spectra-means-of-discrete-summation-formulae User Link
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Inverse FFT
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Wavetable synthesis
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Quasi band-limited oscillators
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BLIT (Band-limited impulse train)
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T. Stilson: Efficiently-variable non-oversampling al- gorithms in virtual-analog music synthesis – a root- locus perspective. Ph.D. thesis, Stanford University, Stanford, CA, 2006. Available online http://ccrma. stanford.edu/~stilti/papers/.
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T. Stilson, J. O. Smith: Alias-free digital synthesis of classic analog waveforms. Proc. Intl. Computer Music Conf., Hong Kong, China, 1996 332–335.
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BLEP (Band-limited step function)
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E. Brandt: Hard sync without aliasing. Proc. Intl. Computer Music Conf., Havana, Cuba, 2001, 365–368
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A. B. Leary, C. T. Bright: Bandlimited digital syn- thesis of analog waveforms. U.S. Patent 7,589,272, 2009
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fractional delay filters
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feedback frequency modulation
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modified FM pulses
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Alias suppressing oscillators
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Oversampling/Anti-aliased Resampling
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Filtering of full-wave rectified sine wave
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Differentiated piecewise polynomial waveform
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Special approaches to waveform synthesis
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Post-filtering alias reduction
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Waveshaping sinusoid
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Feedback amplitude modulation
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Bitwise logical modulation
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nonlinear modification of the trivially sampled sawtooth waveform
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From digital comb filters
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Source
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researchgate.net > Publication > 242020149 The Brief History of Virtual Analog Synthesis User Link
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Source:
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lib.tkk.fi > Diss > 2014 > Isbn9789526055862 > Isbn9789526055862 User Link
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is passed through a filter
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commonly a resonant low pass filter
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The mouth is a kind of resonant low pass filter
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So rich spectra run through this kind of filters sound somewhat "vocal"
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Filter design often seeks to produce very colored and characterisitc output
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Analog modeling
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Moog ladder filter
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EMS VCS3 filter
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Korg MS-20
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Envelopes
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Generally envelopes are applied to both the amplitude of the source and the frequency of the filter
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analog Filters that allow control of frequency are generally called VCF
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Voltage controlled filter
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This makes the timbre of the sound change over time
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Schematic
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