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Digital signal frequency-division filter method and system

A digital signal, frequency division filtering technology, applied in the digital signal frequency division filtering method and its system field, can solve the problems that the IIR filter cannot achieve linear phase response, instability, etc.

Active Publication Date: 2010-06-09
ALI CORP
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  • Claims
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Problems solved by technology

However, IIR filters cannot achieve an exact linear phase response and may cause instability

Method used

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  • Digital signal frequency-division filter method and system
  • Digital signal frequency-division filter method and system
  • Digital signal frequency-division filter method and system

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Embodiment Construction

[0038] Such as image 3 As shown, it is a schematic block diagram of a frequency division filtering system for processing digital signals in the present invention. The frequency division filter system 10 includes: an analysis filter end 300 , an encoding / decoding unit 400 and a synthesis filter end 500 .

[0039] The analysis filter terminal 300 is used to receive the digital signal X(n), divide the digital signal X(n) into multiple branches first, generate multiple branch analysis stream signals, and output the analysis stream signals of these branches to the encoder after processing / Decoding unit 400. The analysis filter end 300 includes an input filter unit 310 and an input sampling unit 320 .

[0040] The input filter unit 310 includes a first input filter 311 and a second input filter 312 . The first input filter 311 is used for low-pass filtering the branch analysis stream signal to generate a low-frequency branch analysis stream signal, so the first input filter 311...

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Abstract

The method includes steps: first, dividing digital signals into multiple branched stream signals of analytic strings; after process, generating multiple branched stream signals of synthetic strings; finally, combining the multiple branched stream signals of synthetic strings to form the output signal so as to reach high operation efficiency of infinite impulse response filter, and good linear phase response characteristic and stability of finite impulse response. Based on a mirror filter bank the frequency division filtering system uses half frequency filter to filter out stream signals of these branched analytic strings and stream signals of synthetic strings.

Description

technical field [0001] The invention relates to a signal processing system, in particular to a digital signal frequency division filtering method and system thereof. Background technique [0002] Digital filters for processing discrete-time signals are widely used in commercial electronic applications such as CD players, digital stereos, or other audio and non-audio signal processing products. In order for a digital filter to be suitable for processing real-time information, its design must have low computational complexity and be able to output signals quickly. In addition, many products require that when the signal passes through the pass band of the filter, its waveform cannot be distorted, so the frequency of the designed digital filter must have a linear phase characteristic. [0003] Generally speaking, digital filters can be divided into two categories: infinite impulse response filters (Infinite impulse response, IIR) and finite impulse response filters (finite impu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 萧诗骏
Owner ALI CORP
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