Filtering method and filter

A filter and synthesis filter technology, applied in the field of signal processing, can solve the problems of amplitude distortion, phase distortion, high computational complexity, etc., and achieve the effects of reducing time delay, eliminating phase distortion, and eliminating amplitude variation distortion

Active Publication Date: 2011-10-26
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This solution solves the problem of phase distortion introduced by IIR, but there is still some amplitude distortion, and using FIR filter for phase compensation will introduce high computational complexity

Method used

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Embodiment Construction

[0030] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the drawings and embodiments.

[0031] Such as figure 1 As shown, it is a flowchart of a filtering method according to an embodiment of the present invention, which specifically includes the following steps:

[0032] Step 101, receiving the first filtered signal processed by low-pass filtering and the second filtered signal processed by high-pass filter;

[0033] Step 102. Obtain a third filtered signal according to the first filtered signal and the second filtered signal, and perform phase-equalized all-pass filtering on the third filtered signal;

[0034] Step 103, obtaining a fourth filtered signal according to the first filtered signal and the second filtered signal, and performing phase equalization all-pass filtering on the fourth filtered signal;

[0035] Step 104: Synthesize the third filtered signal and the fourth filtered signal tha...

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Abstract

The embodiment of the invention relates to a filtering method and a filter. The method comprises the following steps: receiving a first filtering signal after low-pass filtering processing and a second filtering signal after high-pass filtering processing; performing all-pass filtering processing with phase equalization on a third filtering signal; performing the all-pass filtering processing with the phase equalization on a fourth filtering signal; and performing synthesis processing on the third filtering signal and the fourth filtering signal after the all-pass filtering processing with the phase equalization to acquire output signals. The filter comprises synthesis filter banks, and a synthesis filter comprises a receiving module, a first all-pass filtering module, a second all-pass filtering module and a synthesis processing module. The filtering method and the filter can eliminate aliased distortion, magnitude distortion and phase distortion, and reduce calculation complexity and the algorithmic time delay.

Description

technical field [0001] Embodiments of the present invention relate to the field of signal processing, and in particular, to a filtering method and a filter. Background technique [0002] A quadrature mirror filter bank (Quadrature Mirror Filter, hereinafter referred to as: QMF) is widely used in the field of signal processing, especially in the fields of speech coding, digital video, communication system and short-term spectrum analysis. Various QMF structures and filtering methods are provided in the prior art, for example, using an infinite impulse response (Infinity Impulse Response, hereinafter referred to as: IIR) / finite impulse response (Finity Impulse Response, hereinafter referred to as: FIR) hybrid filter to achieve approximate A complete reconstruction of QMF (NPR-QMF) is used to approximate the scheme of PR-QMF. In this scheme, the IIR filter is used to divide and combine frequency bands, and the FIR filter is used to compensate the phase distortion caused by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
CPCH03H17/0272H03H17/0266H03H17/027
Inventor 海因里希·W·鲁尔门皮特·瓦里霍克·克鲁格本特·凯瑟张德明张琦
Owner HUAWEI TECH CO LTD
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