ADAPTIVE PHASE-DISTORTIONLESS MAGNITUDE RESPONSE EQUALIZATION (MRE) FOR BEAMFORMING APPLICATIONS

摘要

A time domain impulse response filter may be used to equalize signals in the time domain to avoid error and artifacts that are introduced by domain transforms such as the IFFT. The disclosed time domain impulse response filter is based on the magnitude responses of the individual signals. The magnitude responses for each signal may be calculated in the frequency domain or with other techniques such as auto-regressive analysis and mathematical signal approximations algorithms, such as Padé approximations. An adaptive filter may then equalize the input sensor signals in their original time domain form using a filter calculated based on the processed signals.

主权项

1. A method, comprising:
receiving, by a processor coupled to a plurality of sensors, at least a first input signal and a second input signal in a time domain from the plurality of sensors; converting, by the processor, the first and second input signals from the time domain to a frequency domain input signal; estimating, by the processor, a magnitude response difference between the first and second input signals based, at least in part, on the frequency domain input signal; converting, by the processor, the magnitude response difference into a time domain impulse response; constraining, by the processor, the time domain impulse response to have a linear phase response; and filtering, by the processor, at least one of the first input signal and the second input signal based, at least in part, on the constrained time domain impulse response.