CN103457619B - A kind of digital tuning receives device and control method thereof - Google Patents
A kind of digital tuning receives device and control method thereof Download PDFInfo
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- CN103457619B CN103457619B CN201310309384.0A CN201310309384A CN103457619B CN 103457619 B CN103457619 B CN 103457619B CN 201310309384 A CN201310309384 A CN 201310309384A CN 103457619 B CN103457619 B CN 103457619B
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Abstract
The present invention proposes a kind of digital tuning and receives device, including: for carrying out the analog-digital converter quantified, being filtered the real-time digital with frequency conversion and process logic, the real-time digital intermediate-freuqncy signal after processing is converted into the digital to analog converter of analog if signal and is used for filtering the low pass filter of image frequency components.The present invention uses digital form to realize, good stability, uses digital tuning and digital filtering mode, it is possible not only to realize the output of any intermediate frequency, avoid glitch to produce, it is also possible to realize the most variable of output intermediate-frequency bandwidth, improve selectivity and the Out-of-band rejection ability of intermediate frequency filtering.
Description
Technical field
The present invention relates to electronic technology field, receive device particularly to the digital tuning of one, further relate to a kind of numeral
Formula tuning receives the control method of device.
Background technology
Tuner is mainly used in radiofrequency signal being converted on required intermediate frequency, the function such as including amplification, frequency conversion, filtering.
Tuner is widely used in fields such as radar, communication, electronic reconnaissance, environmental monitoring, test measurements.
It is one of critical function tuning receiver that RF/Microwave signal becomes intermediate-freuqncy signal output, conventional typical case
Output IF-FRE have 10.7MHz, 21.4MHz, 70MHz, 140MHz, 160MHz etc..Typical tuning receives solution principle
Scheme as it is shown in figure 1, usual first local oscillator is tunable oscillator LO in the program1, through the first converter, input signal is become
Frequently, on fixed intermediate frequency, this IF-FRE is referred to as the first intermediate frequency FIF1.Second local oscillator is fixed oscillator LO2, through the second converter
By the first intermediate frequency (FIF1) signal is converted in a certain fixed intermediate frequency frequency again, the most externally exports this intermediate-freuqncy signal FIFout.For
Preferably being tuned receptivity, the program generally uses repeatedly conversion system.The intermediate frequency output of this receiver is solid
Fixed, it is impossible to realize the output of any IF-FRE, more cannot realize exporting the bandwidth varying filtering of intermediate frequency.
In order to realize the output of any intermediate frequency, existing common technology scheme is that the technical scheme shown in Fig. 1 is modified to Fig. 2
Shown technical scheme, is designed to tunable oscillator F by the second local oscillatorLO2, the tuned frequency of the second local oscillator is FLO2′=FIFout
±FIF1.In order to realize FIFoutThe filtering of signal, it is also possible to increase a tunable band-pass filtering after the second intermediate frequency amplifier
Device, the mid frequency of this wave filter is along with FIFoutDifference and change, filter bandwidht is intermediate frequency output bandwidth BIF.Shown in Fig. 2
Technical scheme use analog circuit to realize, circuit structure is complicated, and poor stability can produce substantial amounts of glitch, the most adjustable
Humorous being generally selected property of wave filter and Out-of-band rejection ability are poor, and cannot realize the most variable of intermediate-frequency bandwidth.
Summary of the invention
The invention discloses a kind of digital tuning and receive device and control method thereof, solve receiver intermediate frequency output frequency
Rate cannot arbitrarily adjust, the problem that output intermediate-frequency bandwidth cannot change flexibly.
The technical scheme is that and be achieved in that:
A kind of digital tuning receives device, including: for carrying out the analog-digital converter quantified, it is filtered and frequency conversion
Real-time digital processes logic, and the real-time digital intermediate-freuqncy signal after processing is converted into the digital to analog converter of analog if signal
With the low pass filter for filtering image frequency components；Described real-time digital processes the first digital copy in logic and shakes, first mixes
Frequently reception signal frequency conversion is zero intermediate frequency signals by device and the second frequency mixer, the first adaptive-bandwidth multi tate digital filter and second
Zero intermediate frequency signals is filtered by adaptive-bandwidth multi tate digital filter, the first fader and the second fader pair
Zero intermediate frequency signals carries out gain-adjusted；Second digital copy is shaken, three-mixer and the 4th frequency mixer will become in zero intermediate frequency signals
Frequency becomes the digital medium-frequency signal of output；The two paths of signals that adder generates after three-mixer and the 4th frequency mixer being mixed is added
Computing；Control unit controls the first digital copy and shakes and two duplicates shaking of the second digital copy shake signal output frequency, controls
First bandwidth varying wave digital lowpass filter and the bandwidth of the second bandwidth varying wave digital lowpass filter, control the first gain-adjusted
Device and the amount of gain of the second fader.
Alternatively, two-way orthogonal signalling are generated after described first frequency mixer and the mixing of the second frequency mixer.
Alternatively, described first bandwidth varying multi tate wave digital lowpass filter and the second bandwidth varying multi tate numeral are low
Bandpass filter is the digital filter that two-way is identical.
Alternatively, described first bandwidth varying multi tate wave digital lowpass filter and the second bandwidth varying multi tate numeral are low
Bandpass filter uses filtering extraction structure.
Alternatively, described first bandwidth varying multi tate wave digital lowpass filter and the second bandwidth varying multi tate numeral are low
Bandpass filter uses interpolation filtering structure.
Alternatively, described first bandwidth varying multi tate wave digital lowpass filter and the second bandwidth varying multi tate numeral are low
Bandpass filter uses variable coefficient filter structure.
Present invention also offers a kind of control method, it is adaptable to above-mentioned digital tuning receives device, including following step
Rapid:
Step (a), according to tuning frequency input signal, the output signal frequency that the first digital copy is shaken is arranged to
Frequency input signal is identical；
Step (b), configures the first bandwidth varying multi tate digital filter and second according to required output intermediate-frequency bandwidth
The parameter of bandwidth varying multi tate digital filter, the first bandwidth varying multi tate digital filter and the second bandwidth varying multi-speed
The parameter that rate digital filter is arranged is identical；
Step (c), according to the gain requirement of tuning filtering, arranges the first fader and the second fader；
Step (d), the IF-FRE value of tuning operation, sets the output signal frequency that the second digital copy is shaken as required
It is set to export IF-FRE identical；
Step (e), startup processes, complete by frequency input signal be tuned to the output of IF-FRE.
The invention has the beneficial effects as follows: use digital form to realize, good stability, use digital tuning and digital filtering side
Formula, be possible not only to realize the output of any intermediate frequency, it is to avoid glitch generation, it is also possible to realizes arbitrarily may be used of output intermediate-frequency bandwidth
Become, improve selectivity and the Out-of-band rejection ability of intermediate frequency filtering.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the control block diagram that existing tuning receives device；
Fig. 2 is the control block diagram of the tuning reception device of existing any intermediate frequency output；
Fig. 3 is the control block diagram of the digital tuning reception device of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
As it is shown on figure 3, the digital tuning that the present invention proposes receives device and includes: for by superheterodyne reception measuring instrument
Certain one-level intermediate-freuqncy signal f internalmCarry out the analog-digital converter 2 quantified, be filtered the process of the real-time digital with Up/Down Conversion and patrol
Collecting 15, the real-time digital intermediate-freuqncy signal after processing is converted into the digital to analog converter 12 of analog if signal and is used for filtering
The low pass filter 13 of image frequency components.Wherein real-time digital processes the first digital copy in logic 15 and shakes the 4, first frequency mixer 51
It is used for reception signal frequency conversion being zero intermediate frequency signals with the second frequency mixer 52, the first adaptive-bandwidth multi tate digital filter 61 He
Zero intermediate frequency signals is filtered by the second adaptive-bandwidth multi tate digital filter 62, the first fader 71 and the second gain
Actuator 72 is for carrying out gain-adjusted to zero intermediate frequency signals.Second digital copy is shaken 8, three-mixer 91 and the 4th frequency mixer
92 for being up-converted into the digital medium-frequency signal f of output by zero intermediate frequency signals0.Control unit 10 is for shaking to the first digital copy
4 and second digital copy shake 8 two duplicates shake the control of signal output frequency, be also used for controlling the first bandwidth varying number simultaneously
Word low pass filter 61 and the bandwidth of the second bandwidth varying wave digital lowpass filter 62, be additionally operable to control the first fader 71
Amount of gain with the second fader 72.
The input 1 of this device can be a certain fixed intermediate frequency signal in superhet frequency conversion system, by ADC transducer 2
It is acquired, becomes zero intermediate frequency signals 3.This zero intermediate frequency signals 3 is divided into two-way and enters the first frequency mixer 51 and the second frequency mixer 52,
With the first frequency controlled digital copy shake 4 signal be mixed, the first digital copy shake 4 be referred to as NCO1.First numeral is multiple
It is f that local oscillator 4 can produce frequency by controlmMultiple sinusoidal signal sequence 41 and multiple sinusoidal signal sequence 42, respectively cos (2 π
fmN) with-jsin (2 π fmn).The signal that the two-way that obtains after mixing is orthogonal, referred to as I road signal and Q road signal.First variable strip zone
Wide wave digital lowpass filter 61 and the second bandwidth varying wave digital lowpass filter 62 are to the first frequency mixer 51 and the second frequency mixer 52
The two paths of signals of output is filtered, and completes the intermediate-frequency bandwidth filtering needed.First fader 71 and the second gain-adjusted
Device 72 carries out Gain tuning to filtered signal 611 and signal 612 respectively.Two paths of signals after Gain tuning is with frequency controlled
The second digital copy shake 8 signal be mixed.Second digital copy is shaken and 8 is referred to as NCO2, and it can produce frequency by control
For f0Multiple sinusoidal signal sequence 81 and multiple sinusoidal signal sequence 82, respectively cos (2 π f0N) with-jsin (2 π f0n).Wherein,
Frequency f0It is the IF signal frequency needing output.The two paths of signals generated after mixing is respectively signal 911 and signal 912.
Adder 11 is for carrying out sum operation to signal 911 and signal 912, and the signal sequence obtained is become by DAC 12
Analog if signal.Low pass filter 13, for being filtered the analog if signal being converted into, filters image frequency signal, obtains
The analog if signal 14 of final output.Control unit 10 for control the first digital copy shake 4 and second digital copy shake 8
Output frequency value, is also used for controlling the first bandwidth varying wave digital lowpass filter 61 and the second bandwidth varying wave digital lowpass filter
The bandwidth of 62, is additionally operable to control the first fader 71 and amount of gain of the second fader 72.Wherein the first variable strip zone
Wide multi tate wave digital lowpass filter 61 is the numeral that two-way is identical with the second bandwidth varying multi tate wave digital lowpass filter 62
Wave filter, one of effect is to realize required intermediate-frequency bandwidth filtering, and the two of effect are output data rates, so that output data
The speed that speed is changed with DAC matches, i.e. identical with the speed of DAC conversion.This wave filter is not limited to one-level wave filter, can
Real according to structures such as intermediate-frequency bandwidth requirement and the filtering of input and output rate requirement selecting extraction, interpolation filtering or variable coefficient filtering
Existing.The digital processing part of the digital tuning filtering device of the present invention can use universal programmable chips to realize.
The present invention gives the control method of above-mentioned digital tuning filtering device, comprises the following steps:
Step (a), according to the frequency input signal f of tuningm, the first digital copy is shaken 4 output signal frequency arrange
Become fm, i.e. identical with frequency input signal；
Step (b), configures the first bandwidth varying multi tate digital filter 61 and according to required output intermediate-frequency bandwidth
The parameter of two bandwidth varying multi tate digital filters 62, the first bandwidth varying multi tate digital filter 61 and the second variable strip zone
The parameter that wide multi tate digital filter 62 is arranged is identical；
Step (c), according to the gain requirement of tuning filtering, arranges the first fader 71 and the second fader
72；
Step (d), as required IF-FRE value f of tuning operation0, the second digital copy is shaken 8 output signal frequency
Rate is arranged to f0, i.e. identical with output IF-FRE；
Step (e), startup processes, can complete frequency input signal fmBe tuned to IF-FRE be f0Output；
Step (f), when exporting IF-FRE and changing, resets according to step (a) to (e).
The digital tuning of the present invention receives device and control method uses digital form to realize, good stability, uses number
The harmonious digital filtering mode of the tone of Chinese characters, be possible not only to realize the output of any intermediate frequency, it is to avoid glitch generation, it is also possible to realizes output
Intermediate-frequency bandwidth the most variable, improves selectivity and the Out-of-band rejection ability of intermediate frequency filtering.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. a digital tuning receives device, it is characterised in that including: for carrying out the analog-digital converter quantified, filter
The real-time digital of ripple and frequency conversion processes logic, and the real-time digital intermediate-freuqncy signal after processing is converted into analog if signal
Digital to analog converter and for filtering the low pass filter of image frequency components；
Described real-time digital processes logic and includes: the first digital copy is shaken, the first frequency mixer and the second frequency mixer, will receive signal
Frequency conversion is zero intermediate frequency signals；First adaptive-bandwidth multi tate digital filter and the second adaptive-bandwidth multi tate digital filter pair
Zero intermediate frequency signals is filtered；First fader and the second fader carry out gain-adjusted to zero intermediate frequency signals；The
Two digital copy are shaken, zero intermediate frequency signals is up-converted into the digital medium-frequency signal of output by three-mixer and the 4th frequency mixer；Add
The two paths of signals sum operation that musical instruments used in a Buddhist or Taoist mass generates after three-mixer and the 4th frequency mixer being mixed；Control unit controls the first numeral
Duplicate shakes and two duplicates shaking of the second digital copy shake signal output frequency, controls the first bandwidth varying wave digital lowpass filter
With the bandwidth of the second bandwidth varying wave digital lowpass filter, control the first fader and the gain of the second fader
Amount；
It is a certain fixed intermediate frequency signal in superhet frequency conversion system that digital tuning receives the input of device, passes through analog digital conversion
Device is acquired, and becomes digital medium-frequency signal；This digital medium-frequency signal is divided into two-way and enters the first frequency mixer and the second frequency mixer,
The signal shaken with the first frequency controlled digital copy respectively is mixed；First digital copy is shaken by control generation frequency
fmMultiple sinusoidal signal sequence cos (2 π fmn)-jsin(2πfmN), wherein cos (2 π fmN) the first frequency mixer is inputted, after mixing
To I road signal ,-jsin (2 π fmN) inputting the second frequency mixer, obtaining Q road signal, I road signal and Q road signal after mixing is two-way
Orthogonal signal；First bandwidth varying wave digital lowpass filter and the second bandwidth varying wave digital lowpass filter mix first respectively
Frequently the two paths of signals of device and the output of the second frequency mixer is filtered, and completes the intermediate-frequency bandwidth filtering needed；First fader
Respectively filtered two paths of signals is carried out Gain tuning with the second fader；Two paths of signals after Gain tuning and frequency
The signal that the second controlled digital copy is shaken is mixed；It is f that second digital copy is shaken by controlling generation frequency0Multiple sine
Signal sequence cos (2 π f0n)-j sin(2πf0N), wherein, frequency f0It is the IF signal frequency needing output, cos (2 π
f0N) three-mixer is inputted ,-j sin (2 π f0N) input the 4th frequency mixer；The two paths of signals generated after mixing, enters in adder
Row sum operation, the signal sequence obtained becomes analog if signal by digital to analog converter；Low pass filter is for conversion
The analog if signal become is filtered, and filters image frequency signal, the analog if signal finally exported；Wherein first is variable
Bandwidth multi tate wave digital lowpass filter and the second bandwidth varying multi tate wave digital lowpass filter are the numeral filters that two-way is identical
Ripple device, one of effect is to realize required intermediate-frequency bandwidth filtering, and the two of effect are output data rates, so that output data speed
The speed that rate is changed with analog-digital converter matches, i.e. identical with the speed of analog-digital converter conversion.
2. a kind of digital tuning as claimed in claim 1 receives device, it is characterised in that described first bandwidth varying multi-speed
Rate wave digital lowpass filter and the second bandwidth varying multi tate wave digital lowpass filter use filtering extraction structure.
3. a kind of digital tuning as claimed in claim 1 receives device, it is characterised in that described first bandwidth varying multi-speed
Rate wave digital lowpass filter and the second bandwidth varying multi tate wave digital lowpass filter use interpolation filtering structure.
4. a kind of digital tuning as claimed in claim 1 receives device, it is characterised in that described first bandwidth varying multi-speed
Rate wave digital lowpass filter and the second bandwidth varying multi tate wave digital lowpass filter use variable coefficient filter structure.
5. a control method, it is adaptable to the digital tuning described in any one of Claims 1-4 receives device, and its feature exists
In, comprise the following steps:
Step (a), according to the frequency input signal of tuning, is arranged to the output signal frequency that the first digital copy is shaken and input
Signal frequency is identical；
Step (b), configures the first bandwidth varying multi tate digital filter and second variable according to required output intermediate-frequency bandwidth
The parameter of bandwidth multi tate digital filter, the first bandwidth varying multi tate digital filter and the second bandwidth varying multi tate number
The parameter that word wave filter is arranged is identical；
Step (c), according to the gain requirement of tuning filtering, arranges the first fader and the second fader；
Step (d), the IF-FRE value of tuning operation, is arranged to the output signal frequency that the second digital copy is shaken as required
Identical with output IF-FRE；
Step (e), startup processes, complete by frequency input signal be tuned to the output of IF-FRE.
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| CN105490692A (en) * | 2014-09-19 | 2016-04-13 | 成都振芯科技股份有限公司 | Bandwidth-adjustable zero-intermediate-frequency narrow-band receiving processing method |
| CN105490691A (en) * | 2014-09-19 | 2016-04-13 | 成都振芯科技股份有限公司 | Bandwidth-adjustable zero-intermediate-frequency narrow-band receiving circuit |
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| JP2005020659A (en) * | 2003-06-30 | 2005-01-20 | Maruko & Co Ltd | Programmable digital filter |
| CN101188590A (en) * | 2007-08-21 | 2008-05-28 | 京信通信系统（中国）有限公司 | Digital downlink frequency conversion system and digital downlink frequency conversion method in multi-carrier signal processing |
| CN201114162Y (en) * | 2007-08-31 | 2008-09-10 | 京信通信系统（中国）有限公司 | Multi- carrier digital receiver system based on digital intermediate frequency technology |
| CN101854744A (en) * | 2009-03-31 | 2010-10-06 | 奥维通信股份有限公司 | GSM (Global System for Mobile Communication) digital multichannel frequency-selecting repeater and multichannel digital frequency-selecting digital signal processing method adopted thereby |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2427091A (en) * | 2005-06-08 | 2006-12-13 | Zarlink Semiconductor Ltd | Baseband quadrature frequency down-converter receiver having quadrature up-converter stage |
| GB2462211B (en) * | 2007-04-25 | 2012-01-18 | Telekom Malaysia Berhad | Transceiver front end for software radio systems |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005020659A (en) * | 2003-06-30 | 2005-01-20 | Maruko & Co Ltd | Programmable digital filter |
| CN101188590A (en) * | 2007-08-21 | 2008-05-28 | 京信通信系统（中国）有限公司 | Digital downlink frequency conversion system and digital downlink frequency conversion method in multi-carrier signal processing |
| CN201114162Y (en) * | 2007-08-31 | 2008-09-10 | 京信通信系统（中国）有限公司 | Multi- carrier digital receiver system based on digital intermediate frequency technology |
| CN101854744A (en) * | 2009-03-31 | 2010-10-06 | 奥维通信股份有限公司 | GSM (Global System for Mobile Communication) digital multichannel frequency-selecting repeater and multichannel digital frequency-selecting digital signal processing method adopted thereby |
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Address after: Huangdao Xiangjiang Road 266555 Shandong city of Qingdao Province, No. 98 Patentee after: CLP kesiyi Technology Co.,Ltd. Address before: 266000 No. 98 Xiangjiang Road, Huangdao District, Shandong, Qingdao Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd. |
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