Digital Audio Processing
Brad Caldwell and Mike Pinkel
Advisors: Dr. T. L. Stewart and Dr. D. R. Schertz
The function of an audio crossover network is to divide an audio signal
into separate frequency bands which then may be amplified and fed into
suitable speakers for each band. Traditionally, this has been done in the
analog world using passive components. In this project the crossover function
is performed in the digital domain. Operating in the digital domain has
many advantages with the main one being flexibility, since no hardware
changes are needed to alter the filter characteristics, only code modifications.
An audio signal is sampled using an A/D converter, transferred into a microprocessor
where digital filtering takes place, passed on to three D/A converters,
one for each band, and finally amplified. Serial converters and the Motorola
6816 micro-controller board are used for hardware.
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