In this paper, an acoustic echo canceller (AEC) based on an M-channel infinite-impulse response (IIR) cosine-modulated filter bank (CMFB) with near-perfect reconstruction (PR) property is proposed. The use of a 2-channel lossless lattice section with 1 st order allpass filter in the design of the prototype filter that is common to both the analysis and the synthesis filter banks permits the fil...

In this paper, various algorithms for designing quadrature mirror filter are reviewed and a new algorithm is presented for the design of near perfect reconstruction quadrature mirror filter bank. In the proposed algorithm, objective function is formulated using the perfect reconstruction condition or magnitude response condition of prototype filter at frequency (ω = 0.5π) in ideal condition. Th...

This paper presents an efficient implementation of oversampled filter banks derived from a prototype filter by modulation. Via a polyphase analysis, redundancies in the filter operations are removed. With some modifications, a very simple and efficient implementation is found, which is briefly compared to existing realisations.

Cet article presente des implantations optimisées de filtres prototypes de bancs de filtres modulés à reconstruction parfaite, à retard quelconque. Les implantations proposées sont basées sur des "schémas de liftage". Ici, l’approximation des coefficients "de liftage" est faite de manière à ce que le filtrage n’emploie que peu d’operations de décalage et addition. Comme le "schéma de liftage" e...

Making no claim of being exhaustive, a review of the most popular MFCC (Mel Frequency Cepstral Coefficients) implementations is made. These differ mainly in the particular approximation of the nonlinear pitch perception of human, the filter bank design, and the compression of the filter bank output. Then, a comparative evaluation of the presented implementations is performed on the task of text...

Abstract : In this paper we derive first−order sensitivity expressions for constant−resistance analog filters, that can be used in tree−structured analog filter banks. It is shown that the passband sensitivity is approximately equal to that of a singly resistively terminated ladder network, but weighted with the squared magnitude of the frequency response in the stopband. This makes properly de...

Based on the concept of losslessness in digital filter structures, this paper derives a general class of maximally decimated Mchannel quadrature mirror filter hanks that lead to perfect reconstrnction. The perfect-reconstruction property guarantees that the reconstructed signal f ( a ) is a delayed version of the input signal x (n), i.e., 2 ( n ) = n ( n a,,). It is shown that such a property c...

The spectral factorization approach to pseudo-QMF design doesn't involve any optimization in order to obtain the prototype filter used in the cosine modulation. In this paper, the initial phase factor influence on amplitude distortion is analyzed and a new expression to design pseudo-QMF bank without restriction on the filter's length is proposed. This filter bank introduces a very small aliasi...

Prediction of sinusoidal signals with time-varying frequencies has been an important research topic in power electronics systems. To solve this problem, we propose a new fuzzy predictive filtering scheme, which is based on a Finite Impulse Response (FIR) filter bank. Fuzzy logic is introduced here to provide appropriate interpolation of individual filter outputs. Therefore, instead of regular ‘...

In the present paper, a new design method for continuous-time powersymmetric active RC filters for Hybrid Filter Bank (HFB) is proposed. Some theoretical properties of continious-time power-symmetric filters bank in a more general perspective are studied. This includes the derivation of a new general analytical form, and a study of poles and zeros locations in s-plane. In the proposed design me...