In electronics and signal processing, a Bessel filter is a type of analog linear filter with a maximally flat group delay (i.e., maximally linear phase response), which preserves the wave shape of filtered signals in the passband. [1] Bessel filters are often used in audio crossover systems.

Bessel filters are optimized for maximally-flat time delay (or constant-group delay). This means that they have linear phase response and excellent transient response to a pulse input.

besself designs analog Bessel filters, which are characterized by an almost constant group delay across the entire passband, thus preserving the wave shape of filtered signals in the passband. Lowpass Bessel filters have a monotonically decreasing magnitude response, as do lowpass Butterworth filters.

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.

Filters are networks that process signals in a frequency-dependent manner. The basic concept of a filter can be explained by examining the frequency dependent nature of the impedance of capacitors and inductors. Consider a voltage divider where the shunt leg is a reactive impedance.

2019年6月3日 · Bessel filters are also known as the “Maximally Linear Phase” filter. These filters are designed to let a few boosts and dips enter the pass band, with the overall goal of minimizing the group delay to keep it as consistent as possible.

The Bessel filter, the filter of choice for op amps if phase response is of concern, is one of multiple discrete circuits described in a series of mini tutorials.

2024年9月12日 · What is Bessel filter response? Bessel filters are designed to optimize maximally flat time delay, ensuring a constant group delay. This characteristic results in a linear phase response and an outstanding transient response to pulse inputs.

Bessel filter: good time domain response. A Bessel filter has maximally flat time delay, resulting in nearly linear phase. As frequency increases, a constant delay becomes an increasingly greater fraction of 360 degrees.

2023年11月9日 · Bessel filters are optimized for maximally-flat time delay (or constant group delay). This means that they have linear phase response and excellent transient response to a pulse input. This comes at the expense of flatness in the pass-band and rate of roll-off.