CN103475335A - Polyphase digital drop sampling filter - Google Patents
Polyphase digital drop sampling filter Download PDFInfo
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- CN103475335A CN103475335A CN2013103958662A CN201310395866A CN103475335A CN 103475335 A CN103475335 A CN 103475335A CN 2013103958662 A CN2013103958662 A CN 2013103958662A CN 201310395866 A CN201310395866 A CN 201310395866A CN 103475335 A CN103475335 A CN 103475335A
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Abstract
The invention discloses a polyphase digital drop sampling filter. The input end of a cascade integrator comb is connected with a multiple drop sampling rate controller, and the output end of the cascade integrator comb is connected with a summator. A delayer is arranged between a multiple drop sampling rate controller of a next cascade integrator comb and the multiple drop sampling rate controller of the last cascade integrator comb. Thus, the polyphase digital drop sampling filter integrates a plurality of same cascade integrator combs low in order into a whole body of the polyphase filter, and an effect of approaching a high-order cascade integrator comb is achieved.
Description
Technical field
The present invention relates to a kind of filter, relate in particular to a kind of multiphase digital desampling fir filter.
Background technology
Cascaded integrator-comb (CIC) digital filter uses widely in desampling fir filter.The main feature of CIC filter is, only utilizes adder, subtracter and register (without multiplier), therefore take resource few, realize simple and speed is high.In existing cic filter, arrow down shows it is to reduce sample rate.The major parameter of CIC filter is exponent number L and reduce sampling frequency M, and M means to reduce sample rate M doubly, but the main performance parameter of this filter is the passband maximum attenuation, minimum attenuation in stop band etc.General exponent number is higher, and filtering is stronger, and the minimal attenuation of stopband is less.
Same transfer function or performance of filter, can realize with multiphase filter, and multiphase filter can be put into most evaluation works of filtering the lower clock frequency domains after the reduction sample rate, thereby promote operating rate.The part that is operated in high sample frequency only has a string trigger.But this multiphase filter major defect is, cancelled the integral part of feedback, cause system complexity to rise, and need to use a plurality of multipliers, and only use the cascaded integrator-comb CIC filter ratio of adder, chip area increases greatly.
Summary of the invention
Technical problem to be solved by this invention is, providing a kind of can be attached in multiphase filter integral body organizing the cascade integral comb filter that identical exponent number is lower more, realizes the multiphase digital desampling fir filter close to high-order cascade integral comb filter effect.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of multiphase digital desampling fir filter, and the input of shape filter is connected with multiple reduce sampling frequency controller, and output connects adder; Be provided with delayer between multiple reduce sampling frequency controller on described next group cascade integral comb filter and the down-sampled controller of multiple on upper one group of cascade integral comb filter.
Preferably, described cascade integral comb filter consists of many groups of integrators of connecting successively and comb device, wherein between adjacent integrator and comb device, is provided with the down-sampled controller of multiple.
Preferably, described integrator and comb device form by adder and delayer, and the delayer input in integrator connects the output of adder, and the delayer output connects the adder input; Delayer input in the comb device and output all are connected the input of adder.
Compared with prior art, usefulness of the present invention is: this multiphase digital sampling filter can be attached in multiphase filter integral body organizing the cascade integral comb filter that identical exponent number is lower more, realizes close to high-order cascade integral comb filter effect.
the accompanying drawing explanation:
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is a kind of multiphase digital desampling fir filter of the present invention structural representation.
In figure: 1, cascade integral comb filter; 2, integrator; 3, reduce sampling frequency controller; 4, comb device; 5, delayer; 6, adder.
embodiment:
Below in conjunction with the drawings and the specific embodiments, describe the present invention:
A kind of multiphase digital desampling fir filter shown in Fig. 1, be comprised of the many groups of cascade integral comb filters that are set up in parallel up and down 1; Described cascade integral comb filter 1 consists of the many groups of integrators of connecting successively 3 and comb device 4, wherein between adjacent integrator 3 and comb device 4, is provided with the down-sampled controller of multiple; Described integrator 3 and comb device 4 form by adder and delayer, and the delayer input in integrator 3 connects the output of adder, and the delayer output connects the adder input; Delayer input in comb device 4 and output all are connected the input of adder; The input of described cascade integral comb filter 1 is connected with multiple reduce sampling frequency controller 3, and output connects adder 6; Be provided with delayer 5 between multiple reduce sampling frequency controller 3 on described next group cascade integral comb filter 1 and the down-sampled controller 3 of multiple on upper one group of cascade integral comb filter 1.
This multiphase digital sampling filter can be attached in multiphase filter integral body organizing the cascade integral comb filter 1 that identical exponent number is lower more, realizes close to high-order cascade integral comb filter effect.
It is emphasized that: above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. a multiphase digital desampling fir filter, it is characterized in that: by the many groups of cascade integral comb filters that are set up in parallel up and down (1), formed, the input of described cascade integral comb filter (1) is connected with multiple reduce sampling frequency controller (3), and output connects adder (6); Be provided with delayer (5) between multiple reduce sampling frequency controller (3) on described next group cascade integral comb filter (1) and the down-sampled controller of multiple (3) on upper one group of cascade integral comb filter (1).
2. multiphase digital desampling fir filter according to claim 1, it is characterized in that: described cascade integral comb filter (1) consists of many groups of integrators of connecting successively (3) and comb device (4), wherein between adjacent integrator (3) and comb device (4), is provided with the down-sampled controller of multiple.
3. multiphase digital desampling fir filter according to claim 1, it is characterized in that: described integrator (3) and comb device (4) form by adder and delayer, delayer input in integrator (3) connects the output of adder, and the delayer output connects the adder input; Delayer input in comb device (4) and output all are connected the input of adder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103958662A CN103475335A (en) | 2013-09-04 | 2013-09-04 | Polyphase digital drop sampling filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103958662A CN103475335A (en) | 2013-09-04 | 2013-09-04 | Polyphase digital drop sampling filter |
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| CN103475335A true CN103475335A (en) | 2013-12-25 |
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| CN2013103958662A Pending CN103475335A (en) | 2013-09-04 | 2013-09-04 | Polyphase digital drop sampling filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106470022A (en) * | 2015-08-14 | 2017-03-01 | 中兴通讯股份有限公司 | A kind of filter circuit and method |
| CN108881754A (en) * | 2018-07-19 | 2018-11-23 | 重庆湃芯入微科技有限公司 | A kind of interior desampling fir filter for realizing correlated-double-sampling of numeric field |
| CN113325215A (en) * | 2021-04-28 | 2021-08-31 | 哈尔滨工业大学 | Design method of optical fiber current transformer output controller based on multistage comb filtering |
Citations (4)
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| US5689449A (en) * | 1993-04-05 | 1997-11-18 | Saramaeki; Tapio | Decimation filter |
| CN1635706A (en) * | 2003-12-29 | 2005-07-06 | 华为技术有限公司 | A CIC filter and realizing method therefor |
| CN103117730A (en) * | 2012-12-28 | 2013-05-22 | 上海贝岭股份有限公司 | Multichannel comb filter and implement method thereof |
| CN203406840U (en) * | 2013-09-04 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Polyphase digital downsampling filter |
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2013
- 2013-09-04 CN CN2013103958662A patent/CN103475335A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5689449A (en) * | 1993-04-05 | 1997-11-18 | Saramaeki; Tapio | Decimation filter |
| CN1635706A (en) * | 2003-12-29 | 2005-07-06 | 华为技术有限公司 | A CIC filter and realizing method therefor |
| CN103117730A (en) * | 2012-12-28 | 2013-05-22 | 上海贝岭股份有限公司 | Multichannel comb filter and implement method thereof |
| CN203406840U (en) * | 2013-09-04 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Polyphase digital downsampling filter |
Non-Patent Citations (2)
| Title |
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| 宋建波等: "CIC滤波器的设计与应用", 《信息通信》 * |
| 张公礼: "《全数字接收机理论与技术》", 31 January 2005, 科学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106470022A (en) * | 2015-08-14 | 2017-03-01 | 中兴通讯股份有限公司 | A kind of filter circuit and method |
| CN108881754A (en) * | 2018-07-19 | 2018-11-23 | 重庆湃芯入微科技有限公司 | A kind of interior desampling fir filter for realizing correlated-double-sampling of numeric field |
| CN108881754B (en) * | 2018-07-19 | 2020-07-31 | 重庆湃芯创智微电子有限公司 | Down-sampling filter for realizing correlated double sampling in digital domain |
| CN113325215A (en) * | 2021-04-28 | 2021-08-31 | 哈尔滨工业大学 | Design method of optical fiber current transformer output controller based on multistage comb filtering |
| CN113325215B (en) * | 2021-04-28 | 2022-04-26 | 哈尔滨工业大学 | Design method of optical fiber current transformer output controller based on multistage comb filtering |
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Application publication date: 20131225 |