# Biquad Calculator

The term biquad is used in signal processing. It is also known as a digital bi-quad filter. It is a second-order recursive linear filter, containing two poles and two zeros. This online biquad calculator is used in calculating biquad filter coefficients (a0, a1, a2, b1 and b2) using sample rate, frequency, bandwidth and gain.

## Calculating Biquad Filter Coefficients

A biquad is used as the basic building blocks for complex filters. Biquads come in several forms. Direct form I, Direct form II, Transposed Direct Form II and Direct Form I. Use our Biquad calculator to know the biquad filter coefficients.