I am working with digital amplifiers and from what I can see there is a DC blocking filter that is placed at the start of the signal chain.
- Why is this DC filter placed at the start of the signal chain?
- The cutoff frequency of this filter is just 4Hz. Any intuition behind having a cut off as low as 4Hz?
- This filter is a double precision filter. Is there any reason why DC blocking should be done with a double precision filter rather than a single precision filter?