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Digital Notch Filter (ADC & DAC)
Embedded Systems Lab
A signal is fed to the ADC of a microcontroller, and replicates it using an external DAC, except for a 60Hz signal, which it attenuates.
A signal is fed to the ADC of a microcontroller, and replicates it using an external DAC, except for a 60Hz signal, which it attenuates.
The video below shows it in action. A function generator is connected to the ADC. The sampled data goes through an algorithm that attenuates 60 Hz signals. Finally, using timers and interrupts, the DAC plots the desired output, with 60 Hz signals filtered. The video shows how frequencies other than 60 Hz have a Vpp of ~4.5V, and at 60 Hz exactly, Vpp drops to ~1.6V.
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