FPGA based crosstalk-resistant adaptive decorrelator

Field Programmable Gate-Arrays (FPGAs) are increasingly becoming widespread in the area of communications and signal processing. This paper investigates the implementation of an adaptive decorrelator based on two cross-coupled least-mean squares (LMS) algorithms. The device was designed using the rapid prototyping software developed by National Instruments using a CompactRio. It enables two sound sources which are mixed in a real room environment to be separated by decorrelating the cross-coupling transfer functions that link them together. The work has application in such areas as requires blind-source separation of random signals. Typically this includes hearing aids, smart microphones and speech recognition systems.