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Orthogonal filter set designing method and apparatus

A design method, filter technology, applied in the direction of impedance network, digital technology network, electrical components, etc.

Inactive Publication Date: 2007-06-06
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0047] Using the existing 2-channel QMF group design method to design the filter bank, its amplitude-frequency characteristics have large distortion in the transition region of the adjacent sub-bands of the filter bank

Method used

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  • Orthogonal filter set designing method and apparatus
  • Orthogonal filter set designing method and apparatus
  • Orthogonal filter set designing method and apparatus

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Embodiment Construction

[0103] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0104] From formula (1.13), we can see that when the prototype filter H of the 2-channel QMF group 0 When the order N of is an even number, the amplitude-frequency characteristic of the 2-channel QMF group is:

[0105] A ( e jω ) = 1 2 e - jω ( N - 1 ) [ | H 0 ( e jω ) | 2 + | ...

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Abstract

A method for designing QMF set includes designing original filter according to preset initial cut-off frequency, calculating system function of analysis filter according to system function of original filter, calculating system function of each analysis filter and composition error under each cut-off frequency, obtaining system function of each analysis filter and each integrated filter on confirmed QMF set according to cut-off frequency corresponding to minimum composition error.

Description

technical field [0001] The invention relates to the technical field of filter bank design, in particular to a method and device for designing an orthogonal filter bank. Background technique [0002] The so-called filter bank is a group of filters with a common input signal or a common output signal. Among them, a filter bank with a common input signal and K (K>1) output signals is called an analysis filter bank; a filter bank with K (K>1) input signals and an output signal is called an integrated filter device group. At the analysis filter bank end, the input signal is divided into K sub-band signals, and the sampling rate can be reduced by decimation; at the synthesis filter end, the original signal can be reconstructed through zero-value interpolation and band-pass filtering. The filter bank has a wide range of applications and can be used for data compression such as: sub-band encoding for storage and transmission; it can be used to save computational workload suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
Inventor 张晨冯宇红邓昊
Owner VIMICRO CORP
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