filterwizard • 19 implied HN points • 19 Sep 24
- When comparing analog and digital filters, analog filters tend to perform better in terms of noise, especially at low frequencies. Digital filters can introduce quantization noise that isn't present in analog filters.
- Digital filters, specifically the Direct Form filter, can have significant noise gain, which means they can amplify noise from quantization, making their performance worse in certain situations.
- To improve the noise performance of digital filters, increasing the bit depth of the processing can help, but there are also alternative filter topologies that can reduce noise without needing more bits.