CN103475333A - Compounded multiphase cascade integrator comb filter - Google Patents
Compounded multiphase cascade integrator comb filter Download PDFInfo
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- CN103475333A CN103475333A CN2013103958728A CN201310395872A CN103475333A CN 103475333 A CN103475333 A CN 103475333A CN 2013103958728 A CN2013103958728 A CN 2013103958728A CN 201310395872 A CN201310395872 A CN 201310395872A CN 103475333 A CN103475333 A CN 103475333A
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Abstract
The invention discloses a compounded multiphase cascade integrator comb filter which is formed by a plurality of sets of cascade integrator comb filter units which are arranged in an up-down parallel mode. The input end of each set of cascade integrator comb filter unit is connected with a multiple down-sampling rate controller, and the output end of each set of cascade integrator comb filter unit is connected with an adder. A delayer is arranged between the multiple down-sampling rate controller of each next set of cascade integrator comb filter unit and the multiple down-sampling rate controller of the last set of cascade integrator comb filter unit. Moreover, a compensation filter is connected at the input end of the multiple down-sampling controller of the first set of cascade integrator comb filter unit. The compounded multiphase cascade integrator comb filter is simple in circuit, and after the compensation circuit is used, the compounded multiphase cascade integrator comb filter can have a transfer function universal with that of a traditional cascade integrator comb filter can be achieved, in other words, the compounded multiphase cascade integrator comb filter has the same filter performance as the traditional cascade integrator comb filter.
Description
Technical field
The present invention relates to a kind of filter, relate in particular to the heterogeneous cascade of a kind of mixing minute comb filter.
Background technology
The cascaded integrator-comb digital filter uses widely in desampling fir filter.The main feature of cascaded integrator-comb digital filter is, only utilizes adder, subtracter and register (without multiplier), therefore take resource few, realize simple and speed is high.A kind of cascaded integrator-comb digital filter is arranged at present, and major parameter is exponent number L and reduce sampling frequency M, and M means to reduce sample rate M doubly, main performance parameter is the passband maximum attenuation, minimum attenuation in stop band etc., and general exponent number is higher, 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.
The heterogeneous cascade integral comb filter of a kind of mixing is also arranged at present, although it is simple in structure, and operating frequency than the low M of traditional cascade integral comb filter doubly, but the transfer function of the two or different, cause the filtering performance that mixes heterogeneous cascade integral comb filter on some frequency bands, not have traditional cascade integral comb filter good.
Summary of the invention
Technical problem to be solved by this invention is, the heterogeneous cascade of a kind of mixing minute comb filter is provided, and can realize and the general transfer function of traditional cascade integral comb filter that same filtering performance is namely arranged.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: the heterogeneous cascade integral comb filter of a kind of mixing, by many groups cascade integral comb filter, formed side by side up and down, all be connected with multiple reduce sampling frequency controller on the input of described every group of cascade integral comb filter, output connects adder; Be provided with delayer between the multiple reduce sampling frequency controller of described next group on cascade integral comb filter and the multiple reduce sampling frequency controller on upper one group of cascade integral comb filter, and be connected with compensating filter on the input of the multiple reduce sampling frequency controller on first group of cascade integral comb filter.
Preferably, described cascade integral comb filter is comprised of integrator, comb device and multiple reduce sampling frequency controller, and multiple reduce sampling frequency controller is arranged between integrator and comb device.
Preferably, described integrator is comprised of adder and delayer, and the input of delayer connects the output of adder, and the output of delayer connects the input of adder; Described comb device is comprised of adder, subtracter and delayer, and the delayer input connects the adder input, and the delayer output connects subtracter, and subtracter connects adder.
Preferably, described compensating filter consists of delayer and adder, and delayer is attempted by adder.
Compared with prior art, usefulness of the present invention is: the heterogeneous cascade of this mixing divides comb filter circuit simple, after adopting compensating filter, can realize and the general transfer function of traditional cascade integral comb filter that same filtering performance is namely arranged.
the accompanying drawing explanation:
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the heterogeneous cascade integral comb filter structural representation of a kind of mixing of the present invention.
In figure: 1, cascade integral comb filter; 2, delayer; 3, adder; 4, subtracter; 5, multiple reduce sampling frequency controller; 6, compensating filter.
embodiment:
Below in conjunction with the drawings and the specific embodiments, describe the present invention:
The heterogeneous cascade integral comb filter of a kind of mixing shown in Fig. 1, by many groups cascade integral comb filter 1, formed side by side up and down, described cascade integral comb filter 1 is by integrator, comb device and multiple reduce sampling frequency controller form, multiple reduce sampling frequency controller is arranged between integrator and comb device, all be connected with multiple reduce sampling frequency controller 5 on the input of described every group of cascade integral comb filter 1, output connects adder 3, described integrator is comprised of adder and delayer, the input of delayer connects the output of adder, the output of delayer connects the input of adder, described comb device is comprised of adder, subtracter and delayer, and the delayer input connects the adder input, and the delayer output connects subtracter, and subtracter connects adder, be provided with delayer 2 between multiple reduce sampling frequency controller 5 on described next group cascade integral comb filter 1 and the multiple reduce sampling frequency controller 5 on upper one group of cascade integral comb filter 1, and be connected with compensating filter 6 on the input of the multiple reduce sampling frequency controller 5 on first group of cascade integral comb filter 1, described compensating filter 6 consists of delayer and adder, and delayer is attempted by adder.
The heterogeneous cascade of this mixing divides comb filter circuit simple, after adopting compensating filter 6, can realize and the general transfer function of traditional cascade integral comb filter that same filtering performance is namely arranged.
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 (4)
1. one kind is mixed heterogeneous cascade integral comb filter, it is characterized in that: by many groups cascade integral comb filter (1), formed side by side up and down, all be connected with multiple reduce sampling frequency controller (5) on the input of described every group of cascade integral comb filter (1), output connects adder (3); Be provided with delayer (2) between multiple reduce sampling frequency controller (5) on described next group cascade integral comb filter (1) and the multiple reduce sampling frequency controller (5) on upper one group of cascade integral comb filter (1), and be connected with compensating filter (6) on the input of the multiple reduce sampling frequency controller (5) on first group of cascade integral comb filter (1).
2. the heterogeneous cascade integral comb filter of mixing according to claim 1, it is characterized in that: described cascade integral comb filter (1) is comprised of integrator, comb device and multiple reduce sampling frequency controller, and multiple reduce sampling frequency controller is arranged between integrator and comb device.
3. the heterogeneous cascade integral comb filter of mixing according to claim 2, it is characterized in that: described integrator is comprised of adder and delayer, and the input of delayer connects the output of adder, and the output of delayer connects the input of adder; Described comb device is comprised of adder, subtracter and delayer, and the delayer input connects the adder input, and the delayer output connects subtracter, and subtracter connects adder.
4. the heterogeneous cascade integral comb filter of mixing according to claim 1, it is characterized in that: described compensating filter (6) consists of delayer and adder, and delayer is attempted by adder.
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| CN2013103958728A CN103475333A (en) | 2013-09-04 | 2013-09-04 | Compounded multiphase cascade integrator comb filter |
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| CN2013103958728A CN103475333A (en) | 2013-09-04 | 2013-09-04 | Compounded multiphase cascade integrator comb filter |
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Cited By (1)
| 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 |
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| US20110060783A1 (en) * | 2006-02-16 | 2011-03-10 | Sigmatel, Inc. | Decimation filter |
| 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 |
| CN203406842U (en) * | 2013-09-04 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Mixing polyphase cascading integral comb filter |
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- 2013-09-04 CN CN2013103958728A patent/CN103475333A/en active Pending
Patent Citations (4)
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| US20110060783A1 (en) * | 2006-02-16 | 2011-03-10 | Sigmatel, Inc. | Decimation filter |
| CN101719769A (en) * | 2009-11-20 | 2010-06-02 | 中国电子科技集团公司第四十一研究所 | Arbitrary extracting and filtering device |
| 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 |
| CN203406842U (en) * | 2013-09-04 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Mixing polyphase cascading integral comb filter |
Non-Patent Citations (2)
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| 宋建波等: "CIC滤波器的设计与应用", 《CIC滤波器的设计与应用》, no. 06, 15 December 2012 (2012-12-15), pages 44 - 45 * |
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| 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 |
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Application publication date: 20131225 |