Welcome to the home of Frank Nothaft's senior project in the TJHSST Microelectronics lab.

I am building a 8 channel, 12 bit, digital audio mixer, with a built in digital equalizer. This system uses a MC68000 processor, AD7545 DAC's and MAX122 and ADC0809 ADC's. The digital equalizer will be a FIR filter. Instead of using the MC68000 to do multiplication, I am using a lookup table made out of an array of 4 27C4096 EPROM's. The anti-aliasing and anti-imaging filters are 18kHz Bessel filters. The circuit is designed to sample at about 35kHz, with the processor running at 10MHz.

I hope to see an increase in audio quality (a decrease in signal noise) by increasing the sampling frequency and by increasing the amount of bits used to describe the signal. I also hope to use this project to learn more about FIR filters and associated DSP concepts.

Currently, I am working on code and interrupt setups for my first experiment, in which I will move data from the ADC to the processor, and then from the processor to the DAC.