CN108173558B - Stenode circuit and signal acceptance method - Google Patents
Stenode circuit and signal acceptance method Download PDFInfo
- Publication number
- CN108173558B CN108173558B CN201810203549.9A CN201810203549A CN108173558B CN 108173558 B CN108173558 B CN 108173558B CN 201810203549 A CN201810203549 A CN 201810203549A CN 108173558 B CN108173558 B CN 108173558B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- unit
- intermediate frequency
- mixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The present invention provides a kind of stenode circuit and signal acceptance methods；Wherein, the tuning receiving unit in the circuit is used to receive external radiofrequency signal；Intermediate frequency local oscillator unit is for generating oscillation signals according；Mixing unit is used to radiofrequency signal and oscillation signals according carrying out a Frequency mixing processing, generates the first mixed frequency signal；Medium-high frequency filter unit is used to carry out intermediate frequency trap to the first mixed frequency signal and High frequency filter is handled, and generates medium-high frequency filtering signal；Secondary mixing unit is used to carry out secondary mixing processing to radiofrequency signal and medium-high frequency filtering signal, generates the second mixed frequency signal；Intermediate frequency filtering amplifying unit is used to carry out the second mixed frequency signal intermediate frequency filtering, amplification, exports amplified intermediate-freuqncy signal.The present invention can directly generate the medium-frequency oscillator signal for frequency transformation, stablize local oscillation signal without complicated compensation circuit for rectifying or phase-locked loop circuit, improve the stability of local oscillator IF frequency, simultaneously, it is easy to accomplish and cost is relatively low.
Description
Technical field
The present invention relates to fields of communication technology, more particularly, to a kind of stenode circuit and signal acceptance method.
Background technique
In existing medium wave broadcast receiver, receiving end needs to be provided with the tuning circuit for selecting reception signal,
And the local oscillator tuning circuit for synchronous change frequency；The local frequency of local oscillator tuning circuit output needs to receive frequency complete
A fixed value (for example, intermediate frequency 465kHz) within the scope of rate in the constant frequency higher than (or being lower than) received signals, in this way
After the local frequency of output can just be mixed with the reception signal of input, an intermediate-freuqncy signal is obtained, subsequent processing also needs
Multistage intermediate frequency is carried out to the intermediate-freuqncy signal to amplify.
However, the processing mode needs of above-mentioned receiving end change simultaneously and receive frequency and local frequency, it can usually pass through one
The varactors of the synchronous variation of a duplex potentiometer or two are realized；For example, receiving frequency in medium wave broadcast receiver
Rate range is 526.5kHz~1606.5kHz, Frequency scaling algorithm 1606.5/526.5=3.051, the local oscillator of traditional circuit
The variation range of frequency is 991.5kHz~2071.5kHz, Frequency scaling algorithm 2071.5/991.5=2.089；It is found that connecing
The Frequency scaling algorithm for receiving frequency differs (3.051-2.089)/2.089*100%=46% with the Frequency scaling algorithm of local frequency,
Cause circuit to be difficult to realize and realize constant synchronization in reception frequency range entirely, usually to take complicated and cumbersome front and back section point
Section compensation correction means are synchronous to realize approximately constant, or using more complicated phase-locked loop circuit come accurate compensation.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of stenode circuit and signal acceptance method, to improve
The stability of local oscillator IF frequency.
In a first aspect, circuit is applied to communication receiving device the embodiment of the invention provides a kind of stenode circuit,
Circuit include tuning receiving unit, intermediate frequency local oscillator unit, a mixing unit, medium-high frequency filter unit, secondary mixing unit and
Intermediate frequency filtering amplifying unit；Mixing unit and secondary mixing unit are connect with tuning receiving unit respectively；Primary mixing is single
Member is connect with intermediate frequency local oscillator unit and medium-high frequency filter unit respectively；Secondary mixing unit respectively with medium-high frequency filter unit and in
The connection of frequency filter and amplification unit；Tuning receiving unit is used to receive external radiofrequency signal；Intermediate frequency local oscillator unit is for generating this
Machine oscillator signal；Mixing unit is used to radiofrequency signal and oscillation signals according carrying out a Frequency mixing processing, generates first
Mixed frequency signal；Medium-high frequency filter unit is used to carry out intermediate frequency trap to the first mixed frequency signal and High frequency filter is handled, high in generation
Frequency filtering signal；Secondary mixing unit is used to carry out secondary mixing processing to radiofrequency signal and medium-high frequency filtering signal, generates the
Two mixed frequency signals；Intermediate frequency filtering amplifying unit is used to carry out intermediate frequency filtering to the second mixed frequency signal, generates intermediate-freuqncy signal, then centering
Frequency signal amplifies processing, exports amplified intermediate-freuqncy signal.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein on
Stating circuit further includes high-frequency amplifying unit；High-frequency amplifying unit respectively with tuning receiving unit, a mixing unit and secondary mixed
The connection of frequency unit；High-frequency amplifying unit is used to carry out High frequency amplification processing to radiofrequency signal.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein on
Stating intermediate frequency local oscillator unit includes crystal oscillator；Intermediate frequency local oscillator unit exports the local oscillation of IF frequency by crystal oscillator
Signal.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein on
The first mixed frequency signal for stating the output of a mixing unit includes at least fm+f0Signal, fm-f0Signal and f0Signal；Wherein, fmTo connect
The radiofrequency signal received；f0For oscillation signals according.
The third possible embodiment with reference to first aspect, the embodiment of the invention provides the 4th kind of first aspect
Possible embodiment, wherein above-mentioned first mixed frequency signal isWherein, f0For uL(t)=ULmcosω0t；Radio frequency letter
Number be us(t)=[Ucm+kauΩ(t)]cosωmt；fm+f0ForThe
Constant amplitude ingredient in one mixed frequency signal is
The third possible embodiment with reference to first aspect, the embodiment of the invention provides the 5th kind of first aspect
Possible embodiment, wherein High frequency filter unit includes intermediate frequency trap subelement and high-pass filtering subelement among the above；Intermediate frequency
Trap subelement is used to carry out the processing of intermediate frequency trap to the first mixed frequency signal, to inhibit f0The intensity of signal；High-pass filtering is single
Signal of the member for exporting to intermediate frequency trap subelement carries out high-pass filtering, to inhibit fm-f0Signal and f0Signal extracts fm+
f0Signal.
The 5th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 6th kind of first aspect
Possible embodiment, wherein above-mentioned secondary mixing unit is used for fmAnd fm+f0Signal carries out Frequency mixing processing, and it is mixed to generate second
Frequency signal；Second mixed frequency signal includes at least 2fm+f0Signal and f0Signal；Second mixed frequency signal is
The 6th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 7th kind of first aspect
Possible embodiment, wherein above-mentioned intermediate frequency filter and amplification unit includes intermediate frequency filtering subelement and intermediate frequency amplification subelement；In
Frequency filtering subunit is used to carry out intermediate frequency filtering to the second mixed frequency signal, generates intermediate-freuqncy signal；Intermediate frequency amplify subelement for pair
Intermediate-freuqncy signal amplifies processing, exports amplified intermediate-freuqncy signal.
The 7th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 8th kind of first aspect
Possible embodiment, wherein above-mentioned intermediate-freuqncy signal Intermediate-freuqncy signal
f0' in carry the modulation intelligence of radiofrequency signal.
Second aspect, the embodiment of the invention provides a kind of signal acceptance method, method is applied to above-mentioned superheterodyne reception
Circuit；Method includes: the radiofrequency signal tuned outside receiving unit reception；Intermediate frequency local oscillator unit generates oscillation signals according；One
Radiofrequency signal and oscillation signals according are carried out a Frequency mixing processing by secondary mixing unit, generate the first mixed frequency signal；Medium-high frequency filter
Wave unit carries out intermediate frequency trap to the first mixed frequency signal and High frequency filter is handled, and generates medium-high frequency filtering signal；Secondary mixing list
Member generates the second mixed frequency signal for carrying out secondary mixing processing to radiofrequency signal and medium-high frequency filtering signal；Intermediate frequency filtering is put
Big unit carries out intermediate frequency filtering to the second mixed frequency signal, generates intermediate-freuqncy signal, then amplify processing to intermediate-freuqncy signal, output is put
Intermediate-freuqncy signal after big.
The embodiment of the present invention bring it is following the utility model has the advantages that
A kind of stenode circuit and signal acceptance method provided in an embodiment of the present invention, it is raw by intermediate frequency local oscillator unit
At oscillation signals according；The radiofrequency signal received and oscillation signals according are carried out at primary mixing by a mixing unit
Reason generates the first mixed frequency signal；First mixed frequency signal carries out intermediate frequency trap through medium-high frequency filter unit and High frequency filter is handled
Afterwards, medium-high frequency filtering signal is generated；Above-mentioned radiofrequency signal and the medium-high frequency filtering signal are carried out by secondary mixing unit again
Secondary mixing processing, generates the second mixed frequency signal；Second mixed frequency signal carries out intermediate frequency filtering through intermediate frequency filtering amplifying unit, puts
Output after big；In which, the medium-frequency oscillator signal for frequency transformation can be directly generated by intermediate frequency local oscillator unit, be not necessarily to
Complicated compensation circuit for rectifying or phase-locked loop circuit stablizes local oscillation signal, improves the stability of local oscillator IF frequency, meanwhile,
It is easily achieved and cost is relatively low.
Other features and advantages of the present invention will illustrate in the following description, alternatively, Partial Feature and advantage can be with
Deduce from specification or unambiguously determine, or by implementing above-mentioned technology of the invention it can be learnt that.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, better embodiment is cited below particularly, and match
Appended attached drawing is closed, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of stenode circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another stenode circuit provided in an embodiment of the present invention；
Fig. 3 is the frequency response schematic diagram of intermediate frequency trap subelement provided in an embodiment of the present invention；
Fig. 4 is the frequency response schematic diagram of high-pass filtering subelement provided in an embodiment of the present invention；
Fig. 5 is the frequency response schematic diagram of intermediate frequency filtering subelement provided in an embodiment of the present invention；
Fig. 6 is a kind of flow chart of signal acceptance method provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
In view of in existing communication receiving device, the poor problem of the stability of local frequency, the embodiment of the present invention is mentioned
A kind of stenode circuit and signal acceptance method are supplied；The technology can be applied in communication receiving system, it is particularly possible to
Applied in broadcast receiver, medium wave AM receiver or medium wave broadcast receiver；The technology uses relevant software or hardware
It realizes, is described below by embodiment.
A kind of structural schematic diagram of stenode circuit shown in Figure 1；The circuit is applied to communication receiving device,
The circuit includes tuning receiving unit 10,11, mixing units 12 of intermediate frequency local oscillator unit, medium-high frequency filter unit 13, secondary
Mixing unit 14 and intermediate frequency filtering amplifying unit 15；
Mixing unit 12 and secondary mixing unit 14 are connect with tuning receiving unit 10 respectively；Mixing unit 12
It is connect respectively with intermediate frequency local oscillator unit 11 and medium-high frequency filter unit 13；Secondary mixing unit 14 respectively with medium-high frequency filter unit
13 and intermediate frequency filtering amplifying unit 15 connect；
Tuning receiving unit 10 is used to receive external radiofrequency signal；Intermediate frequency local oscillator unit 11 is for generating local oscillation letter
Number；Mixing unit 12 is used to radiofrequency signal and oscillation signals according carrying out a Frequency mixing processing, generates the first mixing letter
Number；Medium-high frequency filter unit 13 is used to carry out intermediate frequency trap to the first mixed frequency signal and High frequency filter is handled, and generates medium-high frequency filter
Wave signal；Secondary mixing unit 14 is used to carry out secondary mixing processing to radiofrequency signal and medium-high frequency filtering signal, generates second
Mixed frequency signal；Intermediate frequency filtering amplifying unit 15 is used to carry out intermediate frequency filtering to the second mixed frequency signal, generates intermediate-freuqncy signal, then centering
Frequency signal amplifies processing, exports amplified intermediate-freuqncy signal.
Above-mentioned tuning receiving unit can by LC oscillating circuit and antenna to the radio frequency signal in external environment into
Row selectivity receives；Above-mentioned radiofrequency signal may be high-frequency signal；If the radiofrequency signal that receives of tuning receiving unit compared with
It is weak, first the radiofrequency signal can be amplified, then is input in a subsequent mixing unit or secondary mixing unit.
Above-mentioned intermediate frequency local oscillator unit can export the intermediate-freuqncy signal of fixed frequency, for example, 465KHz or 10.7MHz etc.；It should
The frequency of intermediate-freuqncy signal is the IF frequency for needing to convert output；The intermediate frequency local oscillator unit can and work stable by output frequency
The fixed oscillator made in IF frequency realizes that the oscillator that can also can produce intermediate-freuqncy signal by other is real
It is existing.
A kind of stenode circuit provided in an embodiment of the present invention generates local oscillation letter by intermediate frequency local oscillator unit
Number；The radiofrequency signal received and oscillation signals according are subjected to a Frequency mixing processing by a mixing unit, generate first
Mixed frequency signal；First mixed frequency signal is high in generation after medium-high frequency filter unit carries out intermediate frequency trap and High frequency filter processing
Frequency filtering signal；Above-mentioned radiofrequency signal and the medium-high frequency filtering signal are carried out at secondary mixing by secondary mixing unit again
Reason generates the second mixed frequency signal；Second mixed frequency signal exports after intermediate frequency filtering amplifying unit carries out intermediate frequency filtering, amplification；
In which, the medium-frequency oscillator signal for frequency transformation can be directly generated by intermediate frequency local oscillator unit, without complicated benefit
Circuit for rectifying or phase-locked loop circuit are repaid to stablize local oscillation signal, improves the stability of local oscillator IF frequency, simultaneously, it is easy to accomplish
And cost is relatively low.
The structural schematic diagram of another stenode circuit shown in Figure 2；Circuit circuit base shown in Fig. 1
It is realized on plinth；The stenode circuit include tuning receiving unit 10,11, mixing units 12 of intermediate frequency local oscillator unit, in
High frequency filter unit 13, secondary mixing unit 14 and intermediate frequency filtering amplifying unit 15；The circuit further includes high-frequency amplifying unit 20；
The high-frequency amplifying unit 20 is connected with tuning receiving unit 10, mixing units 12, a secondary mixing units 14 respectively；The height
Frequency amplifying unit 20 is used to carry out High frequency amplification processing to radiofrequency signal.
The radiofrequency signal that above-mentioned tuning receiving unit receives can be set to 526.5kHz~1606.5kHz, certainly, receive
The radiofrequency signal arrived can also be other frequency ranges, extend also to any electromagnetic wave frequency range；In order to avoid amplifier itself is right
The interference of radiofrequency signal, the high-frequency amplifying unit include that low-noise amplifier is realized；The low-noise amplifier can pass through crystal
The devices such as pipe, field effect transistor, varactor diode parametric amplifier realize the low noise amplification to signal.
Above-mentioned intermediate frequency local oscillator unit includes crystal oscillator；Intermediate frequency local oscillator unit passes through frequent in crystal oscillator output
The oscillation signals according of rate.The crystal oscillator is specifically as follows quartz oscillator, the quartz oscillator usually by
Quartz crystal and IC circuit composition, and be packaged in shell.The quartz oscillator can export high-precision, high stability
Oscillator signal, be usually used in frequency generator.
Above-mentioned oscillation signals according f0It can be 465KHz or 10.7MHz；The f0It can also be according to the change for receiving band limits
Change, is adjusted to other numerical value, but the usually f0For constant-amplitude signal；First mixed frequency signal of above-mentioned mixing unit output is at least
Including fm+f0Signal, fm-f0Signal and f0Signal；Wherein, fmFor the radiofrequency signal received；f0For oscillation signals according.When
So, which can also include the signal of other frequencies.
With f0=465KHz, fmFor=900KHz, f0With radiofrequency signal fmAfter being input to a mixing unit, through being mixed
Afterwards, above-mentioned f is obtainedm+f0Signal, fm-f0Signal and f0Signal；Wherein, fm+f0=1365KHz, fm-f0=435KHz, f0=
465KHz。
Specifically, if the amplitude-modulated wave of the radiofrequency signal received is us(t)=[Ucm+kauΩ(t)]cosωmt；The machine vibration
Swinging signal is uL(t)=ULmcosω0t；Wherein, ULmFor local oscillator amplitude；ω0For local oscillator angular frequency；UcmFor modulated signal, kaFor
Modulation sensitivity, uΩIt (t) is modulated signal angular frequency, ωmFor carrier angular frequencies；
Then, after the mixing of an above-mentioned mixing unit, available first mixed frequency signal is
In first mixed frequency signal, fm+f0Signal isFirst
Constant amplitude ingredient in mixed frequency signal is
High frequency filter unit includes intermediate frequency trap subelement 131 and high-pass filtering subelement 132 among the above；The intermediate frequency trap
Subelement 131 is used to carry out the processing of intermediate frequency trap to the first mixed frequency signal, to inhibit f0The intensity of signal；Intermediate frequency trap is single
Member can be used for the intermediate-freuqncy signal f in the first mixed frequency signal0It filters out.Frequency response such as Fig. 3 institute of the intermediate frequency trap subelement
Show；The high frequency initial frequency of the intermediate frequency trap subelement can be in fmIt is same or similar, to guarantee fm+f0Signal is not attenuated, band
Interior decaying can be greater than 30-40dB.For example, working as fmWhen=900KHz, the high frequency initial frequency of the intermediate frequency trap subelement can be with
For 900KHz.
The signal that the high-pass filtering subelement 132 is used to export intermediate frequency trap subelement carries out high-pass filtering, to inhibit
fm-f0Signal and f0Signal extracts fm+f0Signal.By to fm-f0Signal and f0Signal is inhibited, and signal phase can be obtained
To stronger fm+f0Signal.The high-pass filtering subelement can be used for the f in the first mixed frequency signalm-f0Signal and f0Signal filter
It removes, the frequency response of the high-pass filtering subelement is as shown in figure 4, the band attenuation of the high-pass filtering subelement can be greater than 30-
40dB。
Above-mentioned secondary mixing unit is used for fmAnd fm+f0Signal carries out Frequency mixing processing, generates the second mixed frequency signal；This
Two mixed frequency signals include at least 2fm+f0Signal and f0Signal；Second mixed frequency signal can also include the signal of other frequencies；It should
Secondary mixing unit can be used for generating the intermediate-freuqncy signal f containing modulated signal0’。
Second mixed frequency signal is
Above-mentioned intermediate frequency filter and amplification unit includes intermediate frequency filtering subelement 151 and intermediate frequency amplification subelement 152；Intermediate frequency filter
Marble unit 151 is used to carry out intermediate frequency filtering to the second mixed frequency signal, generates intermediate-freuqncy signal；The frequency of the intermediate frequency filtering subelement
Response is as shown in Figure 5.Intermediate frequency amplification subelement exports amplified intermediate frequency letter for amplifying processing to intermediate-freuqncy signal
Number.
Above-mentioned intermediate frequency filtering subunit can be by way of resonance by the f in above-mentioned second mixed frequency signal0Signal extraction
Out, the intermediate-freuqncy signal extracted isIntermediate-freuqncy signal f0' in carry
The modulation intelligence of radiofrequency signal.
Above-mentioned stenode circuit shows the intermediate-freuqncy signal of final output through Multisim simulating, verifying, verification result,
I.e. above-mentioned f0' whole modulation intelligences of the radiofrequency signal received are carried, which may be implemented superhet
Receive the signal receiving function of circuit.
Above-mentioned stenode circuit can directly generate the medium-frequency oscillator for frequency transformation by intermediate frequency local oscillator unit
Signal stablizes local oscillation signal without complicated compensation circuit for rectifying or phase-locked loop circuit, improves the stability of local frequency.
Corresponding to the embodiment of above-mentioned stenode circuit, the embodiment of the invention also provides a kind of receiving side signals
Method, this method are applied to above-mentioned stenode circuit；As shown in Figure 6；This method comprises:
Step S602 tunes the radiofrequency signal outside receiving unit reception；Intermediate frequency local oscillator unit generates oscillation signals according；
Radiofrequency signal and oscillation signals according are carried out a Frequency mixing processing by step S604, a mixing unit, generate the
One mixed frequency signal；
Step S606, medium-high frequency filter unit carries out intermediate frequency trap to the first mixed frequency signal and High frequency filter is handled, and generates
Medium-high frequency filtering signal；
Step S608, secondary mixing unit are used to carry out secondary mixing processing to radiofrequency signal and medium-high frequency filtering signal,
Generate the second mixed frequency signal；
Step S610, intermediate frequency filtering amplifying unit carry out intermediate frequency filtering to the second mixed frequency signal, generate intermediate-freuqncy signal, then right
Intermediate-freuqncy signal amplifies processing, exports amplified intermediate-freuqncy signal.
Signal acceptance method provided in an embodiment of the present invention generates oscillation signals according by intermediate frequency local oscillator unit；Pass through
The radiofrequency signal received and oscillation signals according are carried out a Frequency mixing processing by mixing unit, generate the first mixing letter
Number；First mixed frequency signal generates medium-high frequency filtering after medium-high frequency filter unit carries out intermediate frequency trap and High frequency filter processing
Signal；Secondary mixing processing is carried out to above-mentioned radiofrequency signal and the medium-high frequency filtering signal by secondary mixing unit again, is generated
Second mixed frequency signal；Second mixed frequency signal exports after intermediate frequency filtering amplifying unit carries out intermediate frequency filtering, amplification；Which
In, the medium-frequency oscillator signal for frequency transformation can be directly generated by intermediate frequency local oscillator unit, corrected without complicated compensation
Circuit or phase-locked loop circuit stablize local oscillation signal, improve the stability of local oscillator IF frequency.
The embodiment of the invention also provides a kind of communication receiving device, which includes above-mentioned stenode circuit.
Communication receiving device provided in an embodiment of the present invention has phase with stenode circuit provided by the above embodiment
Same technical characteristic reaches identical technical effect so also can solve identical technical problem.
Stenode circuit and signal acceptance method provided in an embodiment of the present invention, the local oscillator of no setting is required changeable frequency
Tuning circuit, does not need that generate a stable IF frequency poor with frequency is received yet, therefore no setting is required in circuit local oscillator
Tuning circuit；Local oscillator can export stable IF frequency signal, just can reach relatively stable essence using crystal oscillator
Degree, it is easy to accomplish, and circuit manufacture and debugging cost be greatly reduced.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. a kind of stenode circuit, which is characterized in that the circuit is applied to communication receiving device, and the circuit includes adjusting
Humorous receiving unit, intermediate frequency local oscillator unit, a mixing unit, medium-high frequency filter unit, secondary mixing unit and intermediate frequency filtering are put
Big unit；
Mixing unit and the secondary mixing unit are connect with the tuning receiving unit respectively；The primary mixing
Unit is connect with the intermediate frequency local oscillator unit and the medium-high frequency filter unit respectively；The secondary mixing unit respectively with it is described
Medium-high frequency filter unit is connected with the intermediate frequency filtering amplifying unit；
The tuning receiving unit is used to receive external radiofrequency signal；The intermediate frequency local oscillator unit is for generating local oscillation letter
Number；Mixing unit is used to the radiofrequency signal and the oscillation signals according carrying out a Frequency mixing processing, generates
First mixed frequency signal；The medium-high frequency filter unit is used to carry out at intermediate frequency trap and High frequency filter first mixed frequency signal
Reason generates medium-high frequency filtering signal；The secondary mixing unit is used for the radiofrequency signal and the medium-high frequency filtering signal
Secondary mixing processing is carried out, the second mixed frequency signal is generated；The intermediate frequency filtering amplifying unit is used for second mixed frequency signal
Intermediate frequency filtering is carried out, generates intermediate-freuqncy signal, then processing is amplified to the intermediate-freuqncy signal, exports the amplified intermediate frequency letter
Number；
First mixed frequency signal of the mixing unit output includes at least fm+f0Signal, fm-f0Signal and f0Signal；
Wherein, fmFor the radiofrequency signal received；The f0For the oscillation signals according；
First mixed frequency signal is
Wherein, the f0For uL(t)=ULm cosω0t；The radiofrequency signal is us(t)=[Ucm+kauΩ(t)]cosωmt；
The fm+f0ForConstant amplitude in first mixed frequency signal
Ingredient is
It wherein, is ULmLocal oscillator amplitude；For ω0Local oscillator angular frequency；UcmFor modulated signal, kaFor modulation sensitivity, uΩIt (t) is modulation
Signal angular frequency, ωmFor carrier angular frequencies.
2. circuit according to claim 1, which is characterized in that the circuit further includes high-frequency amplifying unit；The high frequency
Amplifying unit is connect with the tuning receiving unit, a mixing unit and the secondary mixing unit respectively；
The high-frequency amplifying unit is used to carry out High frequency amplification processing to the radiofrequency signal.
3. circuit according to claim 1, which is characterized in that the intermediate frequency local oscillator unit includes crystal oscillator；
The intermediate frequency local oscillator unit exports the oscillation signals according of IF frequency by the crystal oscillator.
4. circuit according to claim 1, which is characterized in that the medium-high frequency filter unit includes intermediate frequency trap subelement
With high-pass filtering subelement；
The intermediate frequency trap subelement is used to carry out the processing of intermediate frequency trap to first mixed frequency signal, to inhibit the f0Signal
Intensity；
The signal that the high-pass filtering subelement is used to export the intermediate frequency trap subelement carries out high-pass filtering, to inhibit
State fm-f0Signal and the f0Signal extracts the fm+f0Signal.
5. circuit according to claim 4, which is characterized in that the secondary mixing unit is used for the fmWith the fm+
f0Signal carries out Frequency mixing processing, generates the second mixed frequency signal；Second mixed frequency signal includes at least 2fm+f0Signal and f0Letter
Number；
Second mixed frequency signal is
It wherein, is ULmLocal oscillator amplitude；For ω0Local oscillator angular frequency；UcmFor modulated signal, kaFor modulation sensitivity, uΩIt (t) is modulation
Signal angular frequency, ωmFor carrier angular frequencies.
6. circuit according to claim 5, which is characterized in that the intermediate frequency filtering amplifying unit includes that intermediate frequency filtering is single
Member and intermediate frequency amplify subelement；
The intermediate frequency filtering subelement is used to carry out intermediate frequency filtering to second mixed frequency signal, generates intermediate-freuqncy signal；
The intermediate frequency amplification subelement is used to amplify the intermediate-freuqncy signal processing, exports the amplified intermediate frequency letter
Number.
7. circuit according to claim 6, which is characterized in that the intermediate-freuqncy signal
The intermediate-freuqncy signal f0' in carry the modulation intelligence of the radiofrequency signal.
8. a kind of signal acceptance method, which is characterized in that the method is applied to the described in any item superhet of claim 1-7
Receive circuit；The described method includes:
Tune the radiofrequency signal outside receiving unit reception；Intermediate frequency local oscillator unit generates oscillation signals according；
The radiofrequency signal and the oscillation signals according are carried out a Frequency mixing processing by mixing unit, generate the first mixing
Signal；
Medium-high frequency filter unit carries out intermediate frequency trap to first mixed frequency signal and High frequency filter is handled, and generates medium-high frequency filtering
Signal；
Secondary mixing unit is used to carry out secondary mixing processing to the radiofrequency signal and the medium-high frequency filtering signal, generates the
Two mixed frequency signals；
Intermediate frequency filtering amplifying unit carries out intermediate frequency filtering to second mixed frequency signal, generates intermediate-freuqncy signal, then to the intermediate frequency
Signal amplifies processing, exports the amplified intermediate-freuqncy signal；
First mixed frequency signal of the mixing unit output includes at least fm+f0Signal, fm-f0Signal and f0Signal；
Wherein, fmFor the radiofrequency signal received；The f0For the oscillation signals according；
First mixed frequency signal is
Wherein, the f0For uL(t)=ULm cosω0t；The radiofrequency signal is us(t)=[Ucm+kauΩ(t)]cosωmt；
The fm+f0ForConstant amplitude in first mixed frequency signal
Ingredient is
It wherein, is ULmLocal oscillator amplitude；For ω0Local oscillator angular frequency；UcmFor modulated signal, kaFor modulation sensitivity, uΩIt (t) is modulation
Signal angular frequency, ωmFor carrier angular frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203549.9A CN108173558B (en) | 2018-03-12 | 2018-03-12 | Stenode circuit and signal acceptance method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203549.9A CN108173558B (en) | 2018-03-12 | 2018-03-12 | Stenode circuit and signal acceptance method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108173558A CN108173558A (en) | 2018-06-15 |
| CN108173558B true CN108173558B (en) | 2019-08-27 |
Family
ID=62511105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810203549.9A Active CN108173558B (en) | 2018-03-12 | 2018-03-12 | Stenode circuit and signal acceptance method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108173558B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365350B (en) * | 2019-06-24 | 2021-11-16 | 成都振芯科技股份有限公司 | Method and device for enhancing adaptability of receiving channel orthogonal correction algorithm |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3463388B2 (en) * | 1994-12-28 | 2003-11-05 | ミツミ電機株式会社 | Quadrature detection circuit |
| JP2892971B2 (en) * | 1995-06-21 | 1999-05-17 | アンリツ株式会社 | Multipath delay spread measuring apparatus and method |
| CN104967458A (en) * | 2015-06-11 | 2015-10-07 | 哈尔滨工程大学 | CPCI bus control type radio frequency receiving board card and transceiving board card |
| CN106209129B (en) * | 2016-07-20 | 2019-11-26 | 大连昊洋科技发展有限公司 | A kind of dedicated ultrashort wave Data transfer system and method for ocean fisheries administration communication |
| CN207884611U (en) * | 2018-03-12 | 2018-09-18 | 浙江传媒学院 | Stenode circuit and communication receiving device |
-
2018
- 2018-03-12 CN CN201810203549.9A patent/CN108173558B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108173558A (en) | 2018-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105359408B (en) | Logafier with universal demodulation ability | |
| CN105453419A (en) | Frequency selective logarithmic amplifier with intrinsic frequency demodulation capability | |
| EP2978139B1 (en) | Receiving device and receiving method | |
| CN107395200A (en) | A kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard | |
| CN102594342A (en) | Voltage-controlled oscillator | |
| CN108173558B (en) | Stenode circuit and signal acceptance method | |
| US10056989B2 (en) | Single RF oscillator technique for built-in tune, test, and calibration of a transceiver | |
| WO2005107059A1 (en) | Pulling-free lo generation system and method | |
| CN207884611U (en) | Stenode circuit and communication receiving device | |
| CN106899269B (en) | High-frequency LC voltage-controlled oscillator combining coarse tuning and fine tuning and tuning method | |
| CN203399199U (en) | Universal tuner and digital television receiver system | |
| CN105634410A (en) | Radio frequency down-conversion channel apparatus | |
| US8478220B2 (en) | Discrete time polyphase mixer | |
| CN202364176U (en) | Clock circuit | |
| CN207117599U (en) | A kind of ultra-low noise frequency synthesis and Frequency Transfer circuit for rubidium frequency standard | |
| CN113114113A (en) | Frequency signal generating circuit and method based on double-frequency wireless power supply | |
| US7098747B2 (en) | Precision tunable voltage controlled oscillation and applications thereof | |
| CN101539624B (en) | Method and device for extracting local oscillation from wideband carrier | |
| US20080136543A1 (en) | Oscillator System, Method Of Providing A Resonating Signal And A Communications System Employing The Same | |
| CN103747219B (en) | A kind of DVB carrier wave receives system | |
| CN102820899A (en) | Integrated radio broadcasting receiver | |
| JP4126043B2 (en) | Phase demodulator and mobile phone device | |
| CN215990763U (en) | Device for improving stability of two local oscillator frequencies | |
| CN204718583U (en) | The phase laser distance measurement instrument of single phase-locked loop | |
| CN211670838U (en) | Amplification and mixing integrated experimental device adopting double-gate field effect transistor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |