MusiCub 2002 (Swedish)Independent thesis Basic level (degree of Bachelor)Student thesis

Abstract [sv]

Children with defects such as C.P. (cerebral palsy) often have difficulties with coordination and consequently have problems performing tasks that might seem simple, such as pushing a button. These children benefit from help to make faster progress in their development. However, even children without these problems can make use of a helping hand. The goal of this thesis was to develop an apparatus that enables non-tactile interaction with sound and music. This to give mental stimulation and speed up the psychological development of children with disabilities. The apparatus should have an internal sound source and the ability to communicate with external MIDI compatible equipment. The technology chosen to enable non-tactile operation was capacitance sensing. The capacitance that appears between the hand of the operator and a metal plate was connected in parallel with the shunt capacitor of a feedback loop in a LC-oscillator. As the distance between the hand and the metal plate varied the capacitance changed, thus affecting the frequency of the LC-oscillator. The varying frequency was mixed with a fixed reference frequency in a nonlinear fashion. This created a difference frequency that could be converted to a proportional DC-voltage. Two identical channels were produced so that two DC-voltages could be generated; one for each hand. These voltages acted as a control voltages for a VCA and VCO respectively. They were also fed into a microcontroller responsible for transmitting appropriate MIDI-messages to any auxiliary device.

Place, publisher, year, edition, pages

2002.

Keywords [sv]

Theremin, beröringsfri, VCA, VCO, MIDI, ljud, musik

Identifiers

URN: urn:nbn:se:hh:diva-10404Local ID: U5277OAI: oai:DiVA.org:hh-10404DiVA, id: diva2:365523

Uppsok

Technology

Note

Denna uppsats kan beställas från arkivet / This paper can be ordered from the archive. Kontakta / Contact: arkivet@hh.seAvailable from: 2010-11-09 Created: 2010-11-09Bibliographically approved

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School of Information Science, Computer and Electrical Engineering (IDE)

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