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Construction method of non-uniform dft modulated filter bank based on phase modulation

A filter bank, phase modulation technology, applied in impedance network, digital technology network, electrical components, etc., can solve the problem of inability to effectively realize the overall performance of non-uniform DFT modulation filter, etc., to ensure reconstruction characteristics and frequency characteristics. Effect

Active Publication Date: 2018-05-18
GUILIN UNIV OF ELECTRONIC TECH
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the construction method of the existing non-uniform DFT modulation filter bank cannot effectively realize the non-uniform DFT modulation filter with good overall performance, and a non-uniform DFT modulation filter bank based on phase modulation is provided build method

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  • Construction method of non-uniform dft modulated filter bank based on phase modulation
  • Construction method of non-uniform dft modulated filter bank based on phase modulation
  • Construction method of non-uniform dft modulated filter bank based on phase modulation

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Embodiment Construction

[0019] A method for building a non-uniform DFT modulated filter bank based on phase modulation, comprising the steps of:

[0020] The first step: the structure of a uniform DFT modulated filter bank of M channels is as follows figure 1 shown. The sub-band filters of the uniform filter bank are properly combined and phase-modulated to generate a non-uniform DFT modulated filter bank (structure such as figure 2 shown), each subband filter:

[0021]

[0022]

[0023] In the formula, Denotes the ith analysis subband filter of the non-uniform DFT modulated filter bank, H k (z) denotes the k-th analysis subband filter of the uniform DFT modulated filter bank, Denotes the i-th synthetic subband filter of the non-uniform DFT modulated filter bank, F k (z) represents the kth analysis subband filter of the uniform DFT modulated filter bank, K represents the sampling factor of the uniform DFT modulated filter bank, θ k Indicates the modulation phase of the kth subband filt...

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Abstract

The invention discloses a method for constructing a non-uniform DFT modulated filter bank based on phase modulation. Firstly, a prototype filter of a uniform filter bank is designed; then a uniform DFT modulated filter bank is constructed according to the prototype filter; finally, the uniform filter bank is Each sub-band filter of the group is combined and phase-modulated to generate each sub-band filter of the non-uniform DFT modulated filter bank. The present invention adopts sub-band combining and phase modulation methods to theoretically establish the connection between the non-uniform DFT modulation filter bank and the uniform DFT modulation filter bank, and the constructed filter bank has good overall performance.

Description

technical field [0001] The invention belongs to the field of multi-rate signal processing, and in particular relates to a construction method of a non-uniform DFT (discrete Fourier transform) modulation filter bank based on phase modulation. Background technique [0002] Non-uniform filter banks allow for non-uniform band division, a property that is desirable in many applications. For example, in the hearing assistance system, a cochlear filter bank with non-frequency characteristic division is used; in ECG signal denoising, a non-uniform filter bank is usually used for the extraction and interpretation of the characteristic frequency range signal. [0003] The original non-uniform filter bank adopts a tree structure, such as multi-layer wavelet decomposition, and each layer uses a two-channel wavelet filter bank. The tree type is simple, but its frequency division is not arbitrary, and the frequency characteristics of the equivalent filter are difficult to guarantee. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 周芳蒋俊正刘庆华欧阳缮谢跃雷晋良念丁勇周丽军
Owner GUILIN UNIV OF ELECTRONIC TECH