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- SOFTWARE-BASED DIGITAL AUDIO ON PCs
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- Copyright (C) 1990 David T. Chappell
- All Rights Reserved
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- ABSTRACT
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- Digital audio techniques were investigated with special
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- concentration on computer applications. Experimentation showed
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- that the Intel 8253 programmable interval timer, found on all IBM
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- PCs and compatibles, can output digitized sound. The
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- relationship between pulse amplitude modulation and pulse width
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- modulation signals was found to be significant to this process.
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- Feeding digitized sound data to the chip results in an inherent
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- transfer from pulse amplitude modulation to pulse width
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- modulation encoding. The relationship in signal modulation
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- allows IBM PCs to play digitized sound without the use of extra
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- hardware.
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- Biography:
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- David T. Chappell is a senior in the computer science
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- curriculum at North Carolina State University. In addition, he
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- participates in the co-op program and works for IBM. His
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- interests are in the areas of advanced input/output,
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- technological research, and scientific applications. David plans
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- to attend graduate school in computer science or a related field.
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