CN103944533A - Slotted filter - Google Patents
Slotted filter Download PDFInfo
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- CN103944533A CN103944533A CN201410135057.2A CN201410135057A CN103944533A CN 103944533 A CN103944533 A CN 103944533A CN 201410135057 A CN201410135057 A CN 201410135057A CN 103944533 A CN103944533 A CN 103944533A
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Abstract
The invention discloses a slotted filter which comprises a first adding device, a second adding device, a multiplying device, a shifting register, a slot width regulating module and a modular arithmetic module. The output end of the first adding device is connected with the input end of the second adding device, the output end of the second adding device is connected with the input end of the multiplying device, a constant exp (j*theta) is input to the other input end of the amplifying device, the output end of the multiplying device is connected with the input end of the shifting register, one output end of the shifting register is connected with the slot width regulating module, the other output end of the shifting register is connected with the input end of the second adding device, one output end of the slot width regulating module is connected with the input end of the first adding device, and the other output end of the slot width regulating module is connected with the input end of the modular arithmetic module. The influence of single-tone interference is greatly removed, and the system receiving performance is improved.
Description
Technical field
The present invention relates to digital processing field, particularly, relate to a kind of fluting filter.
Background technology
At present, in communication system, especially, in wide-band communication system, due to the impact of the factors such as harmonic wave or spuious and external environment, make system often receive that single-tone disturbs, and affects system receptivity.If at this moment, to disturbing the processing of correspondingly slotting, can greatly improve system receptivity.Although existing notching construction computing is simple, store less, function singleness, as shown in Figure 1.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of multi-functional fluting filter, greatly remove the impact that single-tone disturbs, improve system receptivity.
For achieving the above object, the technical solution used in the present invention is:
A kind of fluting filter, comprise first adder, second adder, multiplier, shift register, groove width adjusting module and modulo operation module, the output of described first adder is connected with the input of second adder, the output of described second adder is connected with the input of multiplier, another road input input constant exp (j* θ) of described multiplier, the output of described multiplier is connected with the input of shift register, output one tunnel of described shift register is connected with groove width adjusting module, another road of the output of shift register is connected with the input of second adder, output one tunnel of described groove width adjusting module is connected with the input of first adder, another road of the output of groove width adjusting module is connected with the input of modulo operation module.
According to preferred enforcement of the present invention, the initial value in described shift register is 0.
According to preferred enforcement of the present invention, the numerical value of N in groove width adjusting module has determined groove width, and N more vat is narrower., wherein N round numbers is just considered based on the facility realizing, corresponding to
situation.
According to preferred enforcement of the present invention, the output signal of modulo operation module has reflected the intensity that single-tone disturbs, and uses as single-tone detection or extraction.
Technical scheme of the present invention has following beneficial effect:
1) can do with the situation of gradual single-tone
2) slotting position is controlled:
time, deteriorate to DC case.
3) modulo operation module Output rusults Tone_Amp has reflected the intensity that single-tone disturbs, and can be used as single-tone detection or single-tone abstraction function and uses.
4), in the time that the time is not bottleneck, can considers that the several frequency locations to being concerned about are searched for, thereby while meeting fluting condition, be slotted in corresponding frequency position.
5) groove width is controlled, and N has determined groove width, and N is larger, and groove is narrower.
6), if change the number of shift register, can realize the equal portions fluting within the scope of nyquist frequency.If the number of shift register is 2, can except
outside place fluting, simultaneously will be
place fluting, two groove groove widths equate, and the half of groove width while being respectively single groove.
Technical scheme of the present invention, by drawings and Examples, is described in further detail technical scheme of the present invention.
Brief description of the drawings
Fig. 1 is time domain transfer principle schematic diagram;
Fig. 2 is fluting filter floating-point implementation structure figure;
Fig. 3 is the fluting Filter Principle schematic diagram described in technical solution of the present invention.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-first adder; 2-second adder; 3-multiplier; 4-shift register; 5-groove width adjusting module; 6-modulo operation module.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
The filter transfer function of slotting is again
Time domain impulse response is accordingly,
,
Obviously time domain impulse response is an exponential decay curve.Its corresponding implementation structure has a variety of.Common transposition two type structures as shown in Figure 1.
As shown in Figure 3, a kind of fluting filter, comprise first adder, second adder, multiplier, shift register, groove width adjusting module and modulo operation module, the output of first adder is connected with the input of second adder, the output of second adder is connected with the input of multiplier, another road input input constant exp (j* θ) of multiplier, the output of multiplier is connected with the input of shift register, output one tunnel of shift register is connected with groove width adjusting module, another road of the output of shift register is connected with the input of second adder, output one tunnel of groove width adjusting module is connected with the input of first adder, another road of the output of groove width adjusting module is connected with the input of modulo operation module.
Wherein, the initial value in shift register is 0.Numerical value of N in groove width adjusting module has determined groove width, and N more vat is narrower.The output signal of modulo operation module has reflected the intensity that single-tone disturbs, and uses as single-tone detection or extraction.
Numeric format in Fig. 2 and Fig. 3 represents with (S, I, F):
S: sign bit, 0 is unsigned number; 1 is signed number
I: integer bit number
F: mark bit number
For example: (1,9,2) are 9 bit integer, the signed number of 2 bit fractional
Sat to S10 in Fig. 2: be saturated to 10 than peculiar symbol plural number.
Exp (j* θ)=cos (θ)+j*sin (θ), θ is the angular frequency in above-mentioned formula
.
Twiddle factor:
Modulo operation module Output rusults, Tone_Amp is single-tone amplitude.
D is initialized as 0.
for normalized radian frequency, f is the monotony frequency of wanting setting, and Fs is sample frequency.The real part rotating again by register configuration and imaginary part mode realize (1,1,14).While realization, by configuration cos_reg=round (cos θ * 2
14), sin_reg=round (sin θ * 2
14), can certainly realize by CORDIC.
Abs is for asking for the modulus of complex number
operation, can realize with following being similar to
simplify, only need displacement relatively can realize:
For improving precision, available following implementation:
" >> " is right-shift operation.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a fluting filter, it is characterized in that, comprise first adder, second adder, multiplier, shift register, groove width adjusting module and modulo operation module, the output of described first adder is connected with the input of second adder, the output of described second adder is connected with the input of multiplier, another road input input constant exp (j* θ) of described multiplier, the output of described multiplier is connected with the input of shift register, output one tunnel of described shift register is connected with groove width adjusting module, another road of the output of shift register is connected with the input of second adder, output one tunnel of described groove width adjusting module is connected with the input of first adder, another road of the output of groove width adjusting module is connected with the input of modulo operation module.
2. fluting filter according to claim 1, is characterized in that, the initial value in described shift register is 0.
3. fluting filter according to claim 2, is characterized in that, the numerical value of N in above-mentioned groove width adjusting module has determined groove width, and N more vat is narrower, and described N round numbers is the facility based on realizing, corresponding to
.
4. fluting filter according to claim 2, is characterized in that, the output signal of above-mentioned modulo operation module has reflected the intensity that single-tone disturbs, and uses as single-tone detection or extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135057.2A CN103944533B (en) | 2014-04-04 | 2014-04-04 | Fluting wave filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135057.2A CN103944533B (en) | 2014-04-04 | 2014-04-04 | Fluting wave filter |
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| Publication Number | Publication Date |
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| CN103944533A true CN103944533A (en) | 2014-07-23 |
| CN103944533B CN103944533B (en) | 2017-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108133239A (en) * | 2018-01-17 | 2018-06-08 | 北京中星微人工智能芯片技术有限公司 | For the method and apparatus for the treatment of classification device sample |
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| US20080256157A1 (en) * | 2006-12-07 | 2008-10-16 | Bostaman Anas Bin Muhamad | Information Processing Device and Information Processing Method |
| CN101621285A (en) * | 2003-06-25 | 2010-01-06 | 美商内数位科技公司 | Digital high pass filter compensation module and wireless transmission/reception unit |
| CN102185587A (en) * | 2011-03-21 | 2011-09-14 | 浙江大学 | Low-power-consumption multi-order interpolation half-band filter with two-phase structure |
| CN102201797A (en) * | 2010-03-23 | 2011-09-28 | 卓胜微电子（上海）有限公司 | Digital filter device |
-
2014
- 2014-04-04 CN CN201410135057.2A patent/CN103944533B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621285A (en) * | 2003-06-25 | 2010-01-06 | 美商内数位科技公司 | Digital high pass filter compensation module and wireless transmission/reception unit |
| US20080256157A1 (en) * | 2006-12-07 | 2008-10-16 | Bostaman Anas Bin Muhamad | Information Processing Device and Information Processing Method |
| CN102201797A (en) * | 2010-03-23 | 2011-09-28 | 卓胜微电子（上海）有限公司 | Digital filter device |
| CN102185587A (en) * | 2011-03-21 | 2011-09-14 | 浙江大学 | Low-power-consumption multi-order interpolation half-band filter with two-phase structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108133239A (en) * | 2018-01-17 | 2018-06-08 | 北京中星微人工智能芯片技术有限公司 | For the method and apparatus for the treatment of classification device sample |
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| CN103944533B (en) | 2017-08-18 |
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Address after: 214000 A3 building, No. 777 West building, Binhu District, Binhu District, Jiangsu, Wuxi, 11 Patentee after: Jiangsu Zhuo Sheng microelectronics Limited by Share Ltd Address before: 214000 Jiangsu province Binhu District of Wuxi City Liyuan Economic Development Zone No. 1 building, twelve floor 530 room 1203 Patentee before: JIANGSU MAXSCEND TECHNOLOGY CO., LTD. |
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