7.1. Noise Reduction with Filters

Try these first

1. 1.

   What is noise in signal processing?

   Hint

   Think about sources of error in your measurements.

2. 2.

   Name a type of filter that allows frequencies below a specific cutoff to pass.

   Hint

   Consider which frequencies you would keep.

3. 3.

   What is the purpose of a digital filter?

   • To enhance signal noise
   • To remove unwanted frequency components
   • To increase signal strength

   Hint

   Think about how filters improve data accuracy.

4. 4.

   True or False: A notch filter eliminates all frequencies.

   • True
   • False

   Hint

   Consider what a notch entails in filtering.

5. 5.

   A sensor collects data contaminated with 50 Hz noise. Propose a filtering strategy and justify your choice of filter.

   Hint

   Identify which filter idealistically removes only the unwanted frequency.

6. 6.

   Discuss how the sampling rate affects the application of digital filters in signal analysis.

   Hint

   Consider the relationship between sampling and data representation in frequency analysis.