Frequency domain adaptive filter based on cyclic convolution and frequency domain processing method thereof

• Main Authors: DONG PENGYU, LUO BENBIAO
• Format: Patent
• Language: Chinese; English
• Published: 15.04.2022
• Subjects: BASIC ELECTRONIC CIRCUITRY; CALCULATING; COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS; COMPUTING; COUNTING; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; PHYSICS; RESONATORS

The invention discloses a frequency domain adaptive filter based on cyclic convolution and a frequency domain processing method thereof, and the filter comprises a first time frequency analysis unit and a second time frequency analysis unit which are used for converting a reference signal and a near-end signal from a time domain to a frequency domain; the echo estimation unit is used for multiplying the frequency domain signal point of the reference signal by the frequency response of the adaptive filter to obtain an estimated echo signal; the residual error estimation unit is used for subtracting the estimated echo signal obtained by the echo estimation unit from the frequency domain signal of the near-end signal to obtain the residual error signal output of the frequency domain; the filter update item calculation unit is used for estimating an adaptive filter update item by using the residual signal of the frequency domain output by the residual estimation unit and the frequency domain signal of the referen