CN203406842U - Mixing polyphase cascading integral comb filter - Google Patents
Mixing polyphase cascading integral comb filter Download PDFInfo
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- CN203406842U CN203406842U CN201320545547.0U CN201320545547U CN203406842U CN 203406842 U CN203406842 U CN 203406842U CN 201320545547 U CN201320545547 U CN 201320545547U CN 203406842 U CN203406842 U CN 203406842U
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- comb filter
- integral comb
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- cascading
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Abstract
The utility model relates to a mixing polyphase cascading integral comb filter. The filter comprises a plurality of groups of cascading integral comb filters in an up-down parallel order. The input end of each group of the cascading integral comb filters is connected with a multiple downsampling rate controller, and the input end of each group of the cascading integral comb filters is connected with an adder. A delayer is disposed between a multiple downsampling rate controller of a cascading integral comb filter of a lower group and a multiple downsampling rate controller of a cascading integral comb filter of an upper group. The input end of the multiple downsampling rate controller of the cascading integral comb filter of the first group is connected with a compensating filter. The mixing polyphase cascading integral comb filter has simple circuits, and uses the compensating circuit to achieve a transfer function that is in common use with the conventional cascading integral comb filter, i.e., the filter provided by the utility model achieves the same filtering performance as the conventional filters.
Description
Technical field
The utility model relates to a kind of filter, relates in particular to the heterogeneous cascade of a kind of mixing minute comb filter.
Background technology
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.Have at present a kind of cascaded integrator-comb digital filter, major parameter is exponent number L and reduce sampling frequency M, and M represents to reduce sample rate M doubly, main performance parameter is 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 reducing after 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.
Also there is at present the heterogeneous cascade integral comb filter of a kind of mixing, 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, causes 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 in the utility model 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, namely has same filtering performance.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: the heterogeneous cascade integral comb filter of a kind of mixing, by organizing cascade integral comb filter, form side by side up and down more, on the input of described every group of cascade integral comb filter, be all connected with multiple reduce sampling frequency controller, output connects adder; Between multiple reduce sampling frequency controller on described next group cascade integral comb filter and the multiple reduce sampling frequency controller on upper one group of cascade integral comb filter, be provided with delayer, 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 delayer input connects adder input, and 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 utility model is: the heterogeneous cascade of this mixing divides comb filter circuit simple, adopt after compensating filter, can realize and the general transfer function of traditional cascade integral comb filter, namely have same filtering performance.
accompanying drawing explanation:
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is that the utility model mixes heterogeneous cascade integral comb filter structural representation.
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, the utility model is described in detail:
The heterogeneous cascade integral comb filter of a kind of mixing shown in Fig. 1, by organizing cascade integral comb filter 1, form side by side up and down more, 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, on the input of described every group of cascade integral comb filter 1, be all connected with multiple reduce sampling frequency controller 5, 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 delayer input connects adder input, and delayer output connects subtracter, and subtracter connects adder, 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, be provided with delayer 2, 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, adopts after compensating filter 6, can realize and the general transfer function of traditional cascade integral comb filter, namely has same filtering performance.
It is emphasized that: be only preferred embodiment of the present utility model above, not the utility model is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above embodiment, all still belong in the scope of technical solutions of the utility model.
Claims (4)
1. one kind is mixed heterogeneous cascade integral comb filter, it is characterized in that: by organizing cascade integral comb filter (1), form side by side up and down more, on the input of described every group of cascade integral comb filter (1), be all connected with multiple reduce sampling frequency controller (5), output connects adder (3); 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), be provided with delayer (2), 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, 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 delayer input connects adder input, and delayer output connects subtracter, and subtracter connects adder.
4. the heterogeneous cascade integral comb filter of mixing according to claim 1, is characterized in that: described compensating filter (6) consists of delayer and adder, and delayer is attempted by adder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320545547.0U CN203406842U (en) | 2013-09-04 | 2013-09-04 | Mixing polyphase cascading integral comb filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320545547.0U CN203406842U (en) | 2013-09-04 | 2013-09-04 | Mixing polyphase cascading integral comb filter |
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| CN203406842U true CN203406842U (en) | 2014-01-22 |
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| CN201320545547.0U Expired - Fee Related CN203406842U (en) | 2013-09-04 | 2013-09-04 | Mixing polyphase cascading integral comb filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475333A (en) * | 2013-09-04 | 2013-12-25 | 苏州苏尔达信息科技有限公司 | Compounded multiphase cascade integrator comb filter |
| 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 |
-
2013
- 2013-09-04 CN CN201320545547.0U patent/CN203406842U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475333A (en) * | 2013-09-04 | 2013-12-25 | 苏州苏尔达信息科技有限公司 | Compounded multiphase cascade integrator comb filter |
| 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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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20140904 |
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| EXPY | Termination of patent right or utility model |