Howtosignalprocessing
- Why use Bessel filter?
- What Bessel filter has as advantage compared to other filter types?
- Is a Bessel filter low pass?
Why use Bessel filter?
The Bessel filter (sometimes called the “Thomson” filter) is optimized to provide a constant group delay in the filter passband, while sacrificing sharpness in the magnitude response. Bessel filters are sometimes used in applications where a constant group delay is critical, such as in analog video signal processing.
What Bessel filter has as advantage compared to other filter types?
The Bessel filter has the gentlest response of the group. Even though it doesn't have a sharp cutoff, it offers superior phase shift (delay) compared to the other filters in the group.
Is a Bessel filter low pass?
The purpose of the Bessel filter is to achieve approximately linear phase, linear phase being equivalent to a time delay. This is the best phase response from an audible standpoint, assuming you don't want to correct an existing phase shift. Bessels are historically low-pass or all-pass.
