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Multi-phase structure of two-channel orthogonal mirror image filter bank and coefficient design method thereof

A filter bank and multi-phase structure technology, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problem of high complexity of FIR filter bank

Active Publication Date: 2019-10-22
HANGZHOU DIANZI UNIV
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Problems solved by technology

When the frequency domain performance requirements of the filter bank are high, the FIR filter in the two-channel QMFB filter bank usually requires a high order, which makes the FIR filter bank have high complexity in hardware implementation

Method used

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  • Multi-phase structure of two-channel orthogonal mirror image filter bank and coefficient design method thereof
  • Multi-phase structure of two-channel orthogonal mirror image filter bank and coefficient design method thereof
  • Multi-phase structure of two-channel orthogonal mirror image filter bank and coefficient design method thereof

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Embodiment Construction

[0091] The present invention will be further described below in conjunction with the drawings.

[0092] Such as figure 1 As shown, a two-channel QMFB conventional polyphase structure includes an analysis filter bank part, two up-2 samplers, two down-2 samplers, a comprehensive filter bank part, a total input port Input and a total output port Output. The analysis filter bank part includes 1 E 0 (z 2 ) Module, 1 E 1 (z 2 ) Module and 1 delay module z -1 . The input signal passes through E from the Input port 0 (z 2 ) Module output to port Output0, from Input port through delay module z -1 Go through E 1 (z 2 ) The module outputs to the port Output1; the output of the Output0 port and the output of the Output1 port are added together to realize the QMFB low-pass analysis filter H 0 (z) output. The output of the Output0 port and the output of the Output1 port are subtracted to realize the QMFB high-pass analysis filter H 1 (z) output. Since this structure is mentioned in many docu...

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Abstract

The invention discloses a multi-phase structure of a two-channel orthogonal mirror image filter bank and a coefficient design method of thereof. At present, most known two-channel QFMB design methodsare optimization design of prototype filter coefficients, and do not pay much attention to reduction of hardware implementation complexity of a QMFB structure. The multi-phase structure of the two-channel orthogonal mirror image filter bank comprises an H0 module, an M (z) module, q modules, a module connecting part, a main input port Input, a main output port Output0 and a main output port Output1. According to the multi-phase structure of the two-channel QMFB analysis filter bank part provided by the invention, a traditional QMFB prototype filter coefficient is converted into a form of an extrapolation pulse response filter, and LU decomposition is adopted, so that more 0 and 1 exist in the coefficient, and multiplier and adder resources are saved.

Description

Technical field [0001] The invention belongs to the technical field of digital signal processing, and specifically relates to a novel low-complexity two-channel quadrature mirror filter group with a multiphase structure and a coefficient design method thereof. Background technique [0002] Two-channel quadrature mirror filter bank (QMFB, quadrature mirror filter bank) is used in more and more fields, such as subband coding of voice and image signals, wavelet basis design, etc. There have been more and more design methods for QMFB in recent years. However, most of the currently known two-channel QFMB design methods are optimized design of the prototype filter coefficients, focusing on the improvement of performance indicators such as QMFB stopband attenuation and reconstruction error, while reducing the hardware implementation complexity of the QMFB structure There is not much attention on it. Based on the design methods of QMFB such as bee colony optimization algorithm, particl...

Claims

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Application Information

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IPC IPC(8): H03H17/02H03H17/00
CPCH03H17/0009H03H17/0225H03H17/0272
Inventor 王浩赵晨子靳一赵知劲李伟琪李祥振
Owner HANGZHOU DIANZI UNIV
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