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Digital filter based on distributed algorithm

A digital filter and distributed algorithm technology, applied in the field of digital signal processing and signal processing, can solve the problems of CIC filter passband attenuation, multiple hardware resources, transition bandwidth, etc., to reduce area, increase stopband attenuation, reduce The effect of small transition band bandwidth

Pending Publication Date: 2020-02-07
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CIC filters usually have problems such as severe passband attenuation and wide transition band.
And the stopband attenuation is related to the number of filter stages, a larger stopband attenuation will inevitably consume more hardware resources while suppressing sidelobes

Method used

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  • Digital filter based on distributed algorithm
  • Digital filter based on distributed algorithm
  • Digital filter based on distributed algorithm

Examples

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0024] Such as figure 1 As shown, the present invention is composed of a cascaded CIC filter, a CIC compensation filter and a half-band filter. The input signal is first decimated and filtered by a CIC filter to reduce the operating frequency of the high-speed system; then the signal is sent to the CIC compensation filter to compensate the passband attenuation of the signal in the CIC filter, and further increase the stopband attenuation to reduce the transition Bandwidth; after the signal passes through the half-band filter based on the distributed algorithm, the transition band becomes steeper, and the stop band attenuation is reduced again, and the useful signal is output after fully meeting...

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Abstract

The invention discloses a digital filter based on a distributed algorithm. The digital filter is formed by cascading a CIC filter, a CIC compensation filter and a half-band filter; an input signal issubjected to decimation filtering through a CIC filter, so that the working frequency of a high-speed system is reduced; then the signal is sent to the CIC compensation filter, the passband attenuation of the signal in the CIC compensation filter is compensated, the stop band attenuation is further increased, and the transition band width is reduced; and finally, after the signal passes through the half-band filter based on the distributed algorithm, the transition band is steeper, the stop band attenuation is reduced again, and a useful signal is output after the performance requirement of the digital filter is completely met. On the premise that all filter parameters reach the overall performance of the filter and meet the signal processing speed, hardware resource consumption is reducedto the maximum extent, and the area of an implementation circuit is reduced.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a digital filter, especially suitable for signal processing in a sigma-delta ADC system. It minimizes the use of hardware resources while ensuring digital filtering performance. Background technique [0002] Current digital filters are widely used in the field of data signal processing, such as decimation filters in ADCs and interpolation filters in DACs. IIR (Infinite ImpulseResponse) filter and FIR (FiniteImpulseResponse) filter are the most common digital filters in linear time-invariant systems. The IIR filter has high filtering efficiency, and it can obtain a better filter amplitude-frequency response with less hardware resources, but because it does not have strict linear phase characteristics, its application neighborhood will be limited; and IIR is implemented in the There is feedback in the architecture, and the finite word length effect must be considered in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/06
CPCH03H17/0671H03H2017/0081
Inventor 贺克军龙善丽吴传奇童紫平唐兴刚张紫乾武凤芹徐福彬张慧
Owner SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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