Jean-Claude Risset is a French composer, best known for his pioneering contributions to computer music. He is a former student of André Jolivet and former coworker of Max Mathews at Bell Labs.
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Arriving at Bell Labs, New Jersey in 1964, he used Mathew’s MUSIC IV software to digitally recreate the sounds of brass instruments. He made digital recordings of trumpets and then studied their timbral composition using “pitch-synchronous” spectrum analysis tools, revealing that the harmonics of these instruments would differ greatly depending on pitch, duration and loudness. He is also credited with performing the first experiments on a range of synthesis techniques including FM Synthesis and waveshaping.
After the discrete Shepard scale Risset created a version of the scale where the steps between each tone are continuous, and it is appropriately called the continuous Risset scale or Shepard-Risset glissando.
He has also created a similar effect with rhythm in which tempo seems to increase or decrease endlessly.
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