In this paper, we present an analysis of the delayless subbabnd adaptive filter structure previously proposed by the authors. We derive a simple expression for the excess MSE of the proposed structure, and show that it requires up to 3.7 times less computational complexity than the corresponding fullband LMS structure. Also, we establish a connection between subband and block adaptive filtering...

A technique is presented for subband adaptive ltering with nonuniform lter banks. The bandwidth allocations of the subband analysis and synthesis lters are adapted to the spectral characteristics of the input data in such a manner as to minimize an objective function built from the subband error powers. The nonuniform lter bank structure allows for fast convergence times for high order systems ...

Employing a recently introduced unified adaptive filter theory, we show how the performance of a large number of important adaptive filter algorithms can be predicted within a general framework in nonstationary environment. This approach is based on energy conservation arguments and does not need to assume a Gaussian or white distribution for the regressors. This general performance analysis ca...

Subband decomposition techniques have been extensively used for data coding and analysis. In most filter banks, the goal is to obtain subsampled signals corresponding to different spectral regions of the original data. However, this approach leads to various artifacts in images having spatially varying characteristics, such as images containing text, subtitles, or sharp edges. In this paper, ad...

Polyphase IIR structures are known to be very attractive for very high performance filters that can be designed using very few coefficients. This combined with their reduced sensitivity to coefficient quantization in comparison to standard FIR and IIR structures makes them very applicable to very fast filtering especially when implemented in fixed point arithmetic. In this paper we suggest repl...

This paper reports on the application of spatially variant IIR filter banks to subband image coding. The new filter bank is based on computationally efficient recursive polyphase decompositions that dynamically change in response to the input signal. In the absence of quantization, reconstruction can be made exact. However, by proper choice of an adaptation scheme, we show that subband image co...