Analysis and design of multirate systems for cancellation of acoustical echoes

An analysis of the multirate concept for the echo cancellation problem is presented that results in the consideration of two classes of solutions. For the first class the solution is derived explicitly, whereas for the second class a general approach and a subclass are discussed. Regarding the application to the cancelling of acoustical echoes the design problem for the frequency-subband concept-which is shown to be a solution of the first class-is examined in more detail and results are presented verifying the efficiency of this method.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>