"These sound files demonstrate bandlimited synthesis of a ramp wave from its fourier series. Limiting the synthesis to a particular number of harmonics affects the quality of the output. The question is how many are necessary for a satisfactory output?
The table below has example sound files of bandlimited ramps with increasing numbers of harmonics. There are tones over three octaves, starting from roughly 85Hz. Note that for the very large numbers of harmonics, there may be aliasing distortion present, since the harmonics will go above the Nyquist frequency for the 44.1KHz sample rate used for the examples."
You can find the table and samples on electric druid's Synth DIY pages.
Tuesday, January 06, 2009
2 comments:
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MATRIXSYNTH - EVERYTHING SYNTH
© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
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MATRIXSYNTH - EVERYTHING SYNTH
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This is an interesting topic WRT additive synthesis. The test page is nice, although the author must not have good speakers. The difference between 300 and 400 partials on the bass sound is obvious, let alone that between 100 and 150, which he refers to as 'negligible.' As far as satisfactory quality goes I think 300 partials is the minimum for the bass example, and this number halves at each octave. Any way you slice it, though, this method is far less practical than oversampled blits or something of that nature. I encourage the author to run tests with blits alongside these additive examples, as the format of the page is concise and effective.
ReplyDeleteClick here for a basic blit algorithm
Thanks for the link to the blit algorithm. that was a good read.
ReplyDelete