OnChip Systems
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Curtis Electromusic Specialties or CEM was a producers of analogue ICs for synthesizers between 1979 and 1988. In 1988 the company became OnChip Systems.
History[edit]
Founded by Doug Curtis in 1979, CEM developed a family of signal processing products for electronic music synthesizers and audio equipment. In 1988, Doug migrated the company to become OnChip Systems. Dave Smith of Sequential Circuits revised the design of the Prophet synthesizer to use CEM (Curtis ElectroMusic) ICs.[1][2] In 2016, it was announced that the CEM3340 VCO had been remanufactured by OnChip using the original design, the CEM3340 RevG. Other manufacturers manufactured copies of the Curtis Chips as well since the patents had expired. Cool Audio produces the V3340 and the V3320. AS ALFA RPAR released the AS3310, AS3320, AS3330, AS3340, AS3345 and AS3360 in DIP and SMD packages.
Major products[edit]
ICs are more compact and economical than discrete circuitry to implement subtractive synthesis modules such as voltage-controlled oscillators, voltage-controlled filters and voltage-controlled amplifier. Even a complete synthesizer voice can be packaged in a integrated circuit. SSM and CEM ICs were used in many synthesizers produced by various electronic music instrument manufacturers, such as Sequential Circuits, Oberheim, Roland, Crumar, EMU, Moog Music and Doepfer. ICs were key components enabling the first programmable polyphonic synthesizers such as the Prophet 5.
See also[edit]
References[edit]
- ↑ Electro-Music Engineer Electronics & Music Maker, Apr 1983
- ↑ About, Curtis Electromusic Specialties (archived)
- The Prophet from Silicon Valley: The Complete Story of Sequential Circuits by David Abernethy, CreateSpace Independent Publishing Platform, 2015, ISBN 1512198323 Search this book on
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External links[edit]
- Curtis Electromusic
- Sound Semiconductor, Inc.
- ICs for Electro-Music (Part 1) by Charles Blakey, Electronics & Music Maker, March 1981, pp. 12-13
- ICs for Electro-Music (Part 2) by Charles Blakey, Electronics & Music Maker, April 1981, pp. 13-16
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