Modular Diary

Here’s my first take at putting together a Frequency Shifter in Audulus. Once again, one of Rob Hordijk’s NOVARS tutorials has provided the inspiration and point of departure.

Hordijk describes the frequency shifter as kind of luxury ring modulator – with the added feature that it’s possible to split the upper and lower sidebands and achieve some special transformations through that. In essence it’s a ring modulator and an all-pass filter network, with the filters making it possible to remove one of the sidebands through phase cancellations.

The all-pass filter is something that Hordijk covers succinctly in his video on the Physics of Sound, and I’d already made one on the basis of his description while putting together an Audulus version of his Dual Phaser. While Hordijk provides a good explanation of the principles behind the frequency shifter and a thorough demonstration of his own module, I needed to do a little detective work before I could figure out what was going on with the filter network.

Modular Diary: Here’s my first take at putting together a Frequency Shifter in @Audulus. Once again, one of Rob Hordijk’s @novars_research tutorials has provided the inspiration and point of departure. Hordijk describes the frequency shifter as… rdgr.me/u/17ksgmq

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Rudiger Meyer is a composer interested in the play between traditional concert music and new media.


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