Published on Jan 10, 2015 Jacob Watters
"A silly experiment making a FIR filter with CMOS chips.
More info here: http://www.jacobwatters.com/blog/cmos..."
"The idea for this experiment came while chatting with some other synth builders about digital FIR filters. One person had previously mentioned that a Lunetta delay circuit I had made was similar to a FIR filter. It used shift registers like a bucket brigade to delay pulses from a square wave Lunetta oscillator. The taps were divided by increasing amounts along the delay line. The idea was to emulate the decaying level of feedback (echo) in a bucket brigade delay circuit.
So I figured I would give it a try again, but this time with the intent of emulating a FIR filter.
Not Technically a FIR
Before getting into the details of this project, I have to make some disclaimers.
This is an emulation of a FIR filter, and not a replacement.
This circuit is entirely impractical. There are far easier analog methods to filter sound.
This circuit only works with pulse waves. Other waveforms are converted into pulse before being used.
This circuit is noisy due to the low sample rate."
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