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首頁(yè)> 外文會(huì)議>8th World Multi-Conference on Systemics, Cybernetics and Informatics(SCI 2004) vol.6: Image, Acoustic, Signal Processing and Optical Systems, Technologies and Applications >On The Design Of A Class Of M-channel NPR And PR IIR Cosine Modulated Filter Banks Using Approximate Cosine Roll-off Prototype Filters And A Modified Model Reduction Technique
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On The Design Of A Class Of M-channel NPR And PR IIR Cosine Modulated Filter Banks Using Approximate Cosine Roll-off Prototype Filters And A Modified Model Reduction Technique

機(jī)譯：近似余弦滾降原型濾波器的M道NPR和PR IIR余弦調(diào)制濾波器組設(shè)計(jì)及模型簡(jiǎn)化技術(shù)研究

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摘要

An efficient and flexible method for designing M-channel nearly perfect reconstruction (NPR) and perfect reconstruction (PR) causal stable IIR cosine modulated filter banks (CMFBs) is proposed. A PR FIR CMFB of similar specification is first designed by using a FIR prototype filter with an approximate cosine-rolloff transition band. The PR FIR prototype filter is then model reduced to an NPR IIR CMFB by modifying a model reduction technique proposed by Brandenstein and Unbehauen. The NPR IIR CMFB has a reasonably good reconstruction error and it is employed as the initial guess to constrained nonlinear optimisation software such as fmincon from MATLAB for designing the PR IIR CMFB. Design results show that both NPR and PR IIR CMFBs with good frequency characteristics and different system delays can be obtained readily by the proposed method.
機(jī)譯：提出了一種有效且靈活的方法，用于設(shè)計(jì)M通道近乎完美重構(gòu)（NPR）和因果穩(wěn)定IIR余弦調(diào)制濾波器組（CMFB）的完美重構(gòu)（PR）。首先通過使用具有近似余弦滾降過渡帶的FIR原型濾波器來(lái)設(shè)計(jì)類似規(guī)格的PR FIR CMFB。然后，通過修改Brandenstein和Unbehauen提出的模型簡(jiǎn)化技術(shù)，將PR FIR原型濾波器模型簡(jiǎn)化為NPR IIR CMFB。 NPR IIR CMFB具有相當(dāng)好的重構(gòu)誤差，它被用作約束非線性優(yōu)化軟件（如MATLAB的fmincon）的初始猜測(cè)，用于設(shè)計(jì)PR IIR CMFB。設(shè)計(jì)結(jié)果表明，通過該方法可以容易地獲得具有良好頻率特性和不同系統(tǒng)延遲的NPR和PR IIR CMFB。

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