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Heterogeneous filter bank filtering method based on tree structure

A filter bank, tree structure technology, applied in impedance networks, digital technology networks, electrical components, etc., can solve the problem that non-uniform filters cannot design non-uniform filter systems with good reconstruction performance.

Active Publication Date: 2017-10-24
HARBIN ENG UNIV
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a non-uniform filter bank filtering method based on a tree structure that solves the problem that the existing non-uniform filter bank construction scheme cannot design a non-uniform filter system with good reconstruction performance

Method used

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  • Heterogeneous filter bank filtering method based on tree structure

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Embodiment Construction

[0076] Below in conjunction with accompanying drawing description, design scheme in the present invention is specifically introduced:

[0077] Step 1: Use the dual-channel FIR standard quadrature mirror filter bank to build a tree-structured non-uniform filter bank, figure 1 is a tree-structured 4-channel non-uniform filter bank of the present invention, figure 2 is the tree structure 4-channel equivalent diagram of the present invention, in the dual-channel filtering system, the low-channel filter H in the analysis module l (z) and high pass filter H h (z) The relationship condition is set to:

[0078] h h (z)=H l (-z) (1)

[0079] The filter relationship between the synthesis module and the analysis module is set as:

[0080] f l (z)=H h (-z), F h (z)=-H l (-z) (2)

[0081] At this time, the whole system has no aliasing distortion and phase distortion.

[0082] Step 2: figure 2 Each channel filter in can be expressed as:

[0083]

[0084]

[0085] and ...

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Abstract

The invention provides a heterogeneous filter bank filtering method based on a tree structure; the method comprises the following steps: using a dual-channel FIR quadrature mirror filter bank as a basic module, and employing the tree structure to build a heterogeneous filter bank; deriving reconstruction conditions of the whole tree structure heterogeneous filter bank, and resulting the whole system complete reconstruction conditions as to design a prototype filter satisfying specific conditions; using an iteration passband cut-off frequency to enable the designed prototype filter to satisfy reconstruction conditions. In a prototype filter special designing process, the method can employ a discrete weight square error criterion; compared with other methods, the criterion can better realize the passband flat characteristics and bigger stop band attenuation; the design scheme can effectively reduce the iteration complexity, can obtain bigger stop band attenuation and excellent system reconfiguration performance, thus providing important application values for a radar broadband channelization receiver and voice and picture signal processing.

Description

technical field [0001] The invention belongs to the technical field of filter banks, and in particular relates to a tree structure-based non-uniform filter bank filtering method. Background technique [0002] Multi-channel filter bank theory is widely used in radar, voice, image and other signal processing fields. The use of this technology effectively reduces the data processing rate requirements, data storage space, and computational complexity. A filter bank system can divide the input signal into frequency bands through multiple filters with different frequency band characteristics in the front-end analysis module of the system, then extract and reduce the speed, and then process sub-band signals of different frequency bands according to actual needs. Then at the back end of the system, the sub-band signal is reconstructed into the required original signal as much as possible through interpolation and the corresponding integrated filter bank. Therefore, the reconstructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/0202H03H2017/021
Inventor 张春杰田春雨杨珑琪李善双郝东斌
Owner HARBIN ENG UNIV
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