On Frequency Domain Adaptive Filters using the Overlap-add Method
نویسنده
چکیده
Frequency Domain Adaptive Filters (FDAFs) are an important subject of current research in digital signal processing. One of the main reasons is that FDAFs have the ability to reduce complexity, especially when the filter length becomes very large. In Adaptive Filter (AF) configurations a convolution and a correlation have t o be carried out. These operations can be done by using overlap methods in combination with Discrete Fourier Transforms (DFTs). Two well-known overlap methods are the so-called overlap-save and the overlap-add method. In literature 111 it is stated that for A F configurations the overlap-save method is to be preferred to the overlap-add method for complexity reasons. By introducing a new F D A F structure we will show that this statement is not correct and that an F D A F using the overlap-add method can be realized with the same number of DFTs as the FDAF using the overlap-save method
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