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Polyphase Structure of Two-Channel Orthogonal Mirror Filter Bank and Its Coefficient Design Method

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

Active Publication Date: 2020-04-21
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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  • Polyphase Structure of Two-Channel Orthogonal Mirror Filter Bank and Its Coefficient Design Method
  • Polyphase Structure of Two-Channel Orthogonal Mirror Filter Bank and Its Coefficient Design Method
  • Polyphase Structure of Two-Channel Orthogonal Mirror Filter Bank and Its Coefficient Design Method

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Embodiment Construction

[0091] The present invention will be further described below in conjunction with accompanying drawing.

[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 synthesis filter bank part, a total input port Input and a total output port Output. The analysis filter bank section includes an E 0 (z 2 ) module, 1 E 1 (z 2 ) module and a delay module z -1 . The input signal passes through the Input port through E 0 (z 2 ) module output to the port Output0, from the Input port first through the delay module z -1 then go through E 1 (z 2 ) module output to the port Output1; the output of the Output0 port and the output of the Output1 port are added to realize the QMFB low-pass analysis filter H 0 The output of (z). The output of the Output0 port is subtracted from the output of the Output1 port to realize the QMFB high-pass analysis filter H 1 The output of (z)...

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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 in particular relates to a novel multi-phase structure of a low-complexity two-channel quadrature image filter bank 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 sub-band coding of speech and image signals, wavelet base design, etc. For the design method of QMFB, there are more and more in recent years. However, most of the currently known two-channel QFMB design methods are optimized design of prototype filter coefficients, focusing on the refinement of performance indicators such as QMFB stopband attenuation and reconstruction error, while reducing the complexity of hardware implementation of the QMFB structure Didn't get much attention. Based on the QMFB design methods such as bee colony optimization algorithm, particle swarm ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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