Microcomputer based real-time student controlled fourier synthesizer

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dc.contributor.advisor Thomas, Gerald P. en_US
dc.contributor.author Toscano, Ralph A. en_US
dc.date.accessioned 2011-06-03T19:33:03Z
dc.date.available 2011-06-03T19:33:03Z
dc.date.created 1981 en_US
dc.date.issued 1981
dc.identifier LD2489.Z78 1981 .T67 en_US
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/handle/182433
dc.description.abstract Electronic solid state circuitry controlled by an SDK-85 microcomputer forms the basis of a digitally controlled Fourier synthesizer module. The hardware involved in this module is the major thrust of this particular research work. Ultimately, once properly machine programmed, the microcomputer will control the base frequency, the number of harmonics present in the output waveshape, and the relative amplitudes and phases of these harmonics.The first phase of the hardware interface entails the conversion of square waves (from 8253 timers via the microcomputer) to triangle waveforms (via LM741 integrators). The triangle waves are then sine shaped by special clipping circuitry. It is the resultant sine waves that are then digitally controlled by machine software. The first stage of the above process eliminates the problem of frequency dependence and gain dropoff of the LM741 operational amplifiers. The relative amplitude of the triangle wave output of the LM741 is compensated for such that the sine shaping circuitry receives a constant amplitude waveform. The second phase of the hardware interface uses digital control of the final sine waveform by means of a Voltage Controlled Amplifier (VCA) and a Digital to Analog Converter (DAC). The VCA acts as the actual interface between the computer and the module.Finally, the output of the VCA'a are mixed and sent through an audio amplifier or to an oscilloscope for user inspection.
dc.format.extent vii, 104 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Fourier series -- Computer programs. en_US
dc.title Microcomputer based real-time student controlled fourier synthesizer en_US
dc.description.degree Thesis (M.S.)
dc.identifier.cardcat-url http://liblink.bsu.edu/catkey/228334 en_US


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  • Master's Theses [5330]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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