Study and comparison of three structures for enhancement of noisy speech

The authors´ concern is the estimation of a signal when two observations signal+noise are available. The intended application is the enhancement of the noisy speech recorded in a car. They present three methods, each consisting of two stages. The first stage identifies a transfer function between the signals or between noises. The second stage acts as a noise canceller. A comparative study between the first and the second method is made to evaluate the constraints for each. An evaluation of the performances of the three methods is made on two observations of noisy speech recorded in a car