CN103107819A - Noise reduction device of receiver and method thereof - Google Patents
Noise reduction device of receiver and method thereof Download PDFInfo
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- CN103107819A CN103107819A CN2011103545849A CN201110354584A CN103107819A CN 103107819 A CN103107819 A CN 103107819A CN 2011103545849 A CN2011103545849 A CN 2011103545849A CN 201110354584 A CN201110354584 A CN 201110354584A CN 103107819 A CN103107819 A CN 103107819A
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Abstract
The invention discloses a noise reduction device of a receiver and a noise reduction method of the receiver. The noise reduction device of the receiver and the noise reduction method of the receiver comprise a baud rate occurrence part outputting forcing and maintaining a specific phase signal, a power supply part, a controller and a convertible circuit. The baud rate of the baud rate occurrence part is synchronized. The power supply part provides a direct current power supply for the receiver and is operated through a fixed frequency of the above signal. The receiver is controlled by the controller and the change of the fixing frequency is controlled by the controller. The convertible circuit is connected with the baud rate occurrence part and the frequency of the fixing frequency is changed by the convertible circuit. The noise reduction method of the receiver comprises a stage of comparison receiving frequency and a stage of the fixing frequency. The stage of the fixing frequency is controlled and changed by the controller when the receiving frequency and the fixing frequency are enlarged by the findings of the compared results. The fixing frequency is the phase locked loop (PLL) frequency output by the phase locked loop. The controller changes the fixing frequency by changing all resistance values of a frequency convertible circuit. The fixing frequency is changed.
Description
Technical field
The present invention relates to a kind of denoising device and method thereof of receiver, particularly, utilize changeable frequency circuit change PLL frequency, remove the devices and methods therefor of receiver noise.
Background technology
By reference to the accompanying drawings 1, the receiver in conventional art is described.Fig. 1 is the formation block diagram of receiver in conventional art.
As shown in Figure 1, the receiver in conventional art is divided into baud rate generating unit 10, DC-DC feeder ear 20, receiver system 30 and controller 40.
Baud rate generating unit 10 transmits PLL (Phase locked loop) frequency to DC-DC feeder ear 20.For the RF system normally moves, the frequency source that generates fixed frequency need to be arranged.But the output frequency that frequency source generates is owing to being subject to surrounding enviroment, such as, the impact of the formation of circuit itself, peripheral equipment, temperature and weather, the situation of slight jitter often occurs.
Because in order to generate the PLL of phase place or frequency stabilization, baud rate generating unit 10 is preferably phase-locked loop (Phase Locked Loop).
Phase-locked loop is by according to the VCO (Voltage Controlled Oscillator) of input voltage output characteristic frequency, the output frequency of exhaustion VCO, so that the counter (counter) that compares with reference frequency, crystal oscillator (the Temperature Compensated X-tal Oscillator of outputting stable frequency under the impacts such as variations in temperature; TCXO), the reference frequency sum counter by crystal oscillator, the output frequency of exhaustion relatively consists of according to the P/D (Phase Detector) of its difference output corresponding pulses, so the fixing PLL signal of frequency that can stable output.
DC-DC feeder ear 20 receives stable fixed frequency work from baud rate generating unit 10, and to receiver system 30 power supplies, receiver system 30 is under the control of controller 40, and the frequency that receives specific channel is exported.
According to above-mentioned conventional art, when the PLL frequency that occurs on the receive frequency of receiving channels and baud rate generating unit 10 is amplified, can produce the beat noise, reduce the reception sensitivity of receiver.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of by utilizing changeable frequency circuit change PLL frequency, can remove denoising device and the method thereof of the receiver of the beat noise that produces when there be concerning of mutual integral multiple in the frequency of receiver received signal and PLL frequency.
Purpose of the present invention is not subject to the above purpose that is mentioned to, and the practitioner of relevant industries can be well understood to by following explanation other purposes that do not relate to.
In order to solve above-mentioned technical problem, technical program of the present invention lies in: a kind of denoising device of receiver, comprise, baud rate is synchronous, and output forces to keep the baud rate generating unit of particular phases signal; By the fixed frequency action of above-mentioned signal, to the power supply of receiver supplying DC power source; Control receiver, the controller that the change of fixed frequency is controlled; Be connected to the baud rate generating unit, the changeable frequency circuit of change fixed frequency.
The noise-reduction method of the receiver of another execution mode according to the present invention, comprise, controller compares the stage of receive frequency and fixed frequency, and comparative result is found, when receive frequency and fixed frequency are amplified, the stage of the change of fixed frequency being controlled by controller.
Here, fixed frequency is preferably the PLL frequency of phase-locked loop output, and controller can change above-mentioned fixed frequency by the whole resistance value of change changeable frequency circuit.
Beneficial effect of the present invention is:
According to the inventive method, utilize the changeable frequency circuit to change the PLL frequency, so can remove the beat noise that produces when the frequency of receiver received signal and PLL frequency are in concerning of mutual integral multiple, help to improve the receptivity of receiver.
Description of drawings
Fig. 1 is the block diagram that in conventional art, receiver consists of;
Fig. 2 is the denoising device block diagram according to the receiver of one embodiment of the present invention;
Fig. 3 is according to one embodiment of the present invention, consists of an execution mode of the changeable frequency circuit of receiver denoising device;
Fig. 4 is another execution mode according to the present invention, the noise-reduction method precedence diagram of receiver.
Embodiment
With reference to the embodiment of accompanying drawing and following detailed introduction, just can understand advantages and features of the invention and concrete methods of realizing.But the present invention is not limited to the embodiment of introducing below, can also have various distortion.Present embodiment just is used for intactly illustrating the present invention, and the practitioner that the technical field under the present invention is grasped certain knowledge intactly informs category of the present invention.The present invention only can define by the category of claim.In addition, the term that uses in this specification just is used for illustrating execution mode, is not to limit the present invention.Unless special explanation is arranged, the odd number in this specification also comprises plural number.
Below in conjunction with accompanying drawing, introduce in detail the specific embodiment of the present invention.
By reference to the accompanying drawings 2 and accompanying drawing 3, the denoising device of the receiver of one embodiment of the present invention is described.Fig. 2 is the denoising device block diagram according to the receiver of one embodiment of the present invention, and Fig. 3 is an execution mode according to the changeable frequency circuit of the formation receiver denoising device of one embodiment of the present invention.
As shown in Figure 2, the denoising device 200 of the receiver of an enforcement side is divided into baud rate generating unit 210, power supply 220, controller 230 and changeable frequency circuit 240 according to the present invention.
Baud rate generating unit 210 be baud rate synchronous after, output is forced to keep the signal of particular phases, and is sent to power supply 220.For output phase or the frequency dimension fixed signal that keeps steady, such as, be phase-locked loop (Phase Locked Loop) according to one embodiment of the present invention baud rate generating unit 210, the fixed frequency of above-mentioned phase-locked loop institute output signal can be PLL (Phase Locked Loop) frequency.
Phase-locked loop is by according to the VCO (Voltage Controlled Oscillator) of input voltage output characteristic frequency, the output frequency of exhaustion VCO, so that crystal oscillator (the Temperature Compensated X-tal Oscillator of outputting stable frequency in the situations such as the counter (counter) that compares with reference frequency, variations in temperature; TCXO), the reference frequency sum counter by crystal oscillator, the output frequency of exhaustion relatively consists of according to the P/D (Phase Detector) of its difference output corresponding pulses, can stably export fixed frequency.
In addition, the receive frequency of controller 230 specific channel that receiver is received and the fixed frequency of 210 output signals of baud rate generating unit compare.Comparative result is found what receive frequency and fixed frequency were amplified, and the change of fixed frequency is controlled.
Here, receive frequency and fixed frequency are amplified, and mean that there are the relation of integral multiple in receive frequency and fixed frequency.When receive frequency and fixed frequency were amplified, the beat noise can occur in the broadcasting channel of reception, so of the present inventionly be intended to remove these noises.
For this reason, be necessary to change receive frequency or fixed frequency, prevent two kinds of frequencies amplifications.But the receive frequency of institute's receiving channels is inalterable, is feature of the present invention places so change the fixed frequency of 210 output signals of baud rate generating unit.Below in conjunction with accompanying drawing 3, introduce in detail.
In order to change fixed frequency, controller 230 utilizes changeable frequency circuit 240.As shown in Figure 3, changeable frequency circuit 240 is that a plurality of resistance and the switch by parallel connection consists of, and is connected to baud rate generating unit 210.
The action of controller 230 control frequency adjusted circuit 240 switches changes fixed frequency.Such as, after controller 230 is identified the receive frequency of institute's receiving channels, compare with fixed frequency, judge whether two kinds of frequencies amplify.
Judged result is found what two kinds of frequencies were amplified, by the switch of controller 230 frequency of operation adjusted circuits 240, changes the whole resistance value of changeable frequency circuit.Such as, during closing switch, generate fixed frequency (PLL1) by the B resistance value, when opening switch, by the total resistance value generation fixed frequency (PLL2) of A resistance value and B resistance value.
So, controller 230 can by changing the whole resistance value of changeable frequency circuit 240, change fixed frequency.
By reference to the accompanying drawings 4, introduce the noise-reduction method of the receiver of another embodiment of the invention.Fig. 4 illustrates the precedence diagram of receiver noise-reduction method for according to another implementation of the invention.
At first, execution in step S410, the receive frequency of controller identification institute receiving channels, execution in step S420 judge whether receive frequency and the synchronous fixed frequency that is used for starting receiver are exaggerated.
Judged result, receive frequency and fixed frequency are amplified, execution in step S430, controller is controlled the change of fixed frequency.
For example, controller utilizes the changeable frequency circuit, the control break fixed frequency.Particularly, the switch motion of controller control frequency adjusted circuit, change fixed frequency.
That is, the switch of controller function changeable frequency circuit, the whole resistance value of change changeable frequency circuit thus can the control break fixed frequency.
The practitioner of the technical field of the invention is to be understood that and can also has other the embodiment that need not to change its technological thought or indispensable characteristics.Therefore, execution mode of the present invention is all exemplary in all respects, and is not confined to this.Scope of the present invention delimited by claims, and the form of all changes of deriving in the meaning of claims and scope and equivalent concepts thereof or distortion all should be understood to belong to category of the present invention.
Claims (6)
1. the denoising device of a receiver, is characterized in that, comprises, baud rate is synchronous, and output forces to keep the baud rate generating unit of particular phases signal;
By the fixed frequency work of described signal, to the power supply of receiver supplying DC power source;
The receive frequency of more described receiver and fixed frequency, comparative result are found, when receive frequency and fixed frequency are all amplified, control the controller of fixed frequency change;
And along with the control of controller, the changeable frequency circuit of change fixed frequency.
2. the denoising device of receiver according to claim 1, it is characterized in that, described changeable frequency circuit is to be made of two above resistance of parallel connection and switch, the switching action of above-mentioned controller control frequency adjusted circuit, whole resistance values of change changeable frequency circuit change described fixed frequency.
3. the denoising device of receiver according to claim 1, is characterized in that, described baud rate generating unit is phase-locked loop, and described natural frequency is the PLL frequency.
4. the noise-reduction method of a receiver, is characterized in that, comprising: controller is with the receiving channels frequency of receiver and stage that the fixed frequency of receiver operation is compared;
Comparative result is found, when above-mentioned receive frequency and fixed frequency are amplified, controls the stage of fixed frequency change.
5. the noise-reduction method of receiver according to claim 4, is characterized in that, described fixed frequency is the PLL frequency of phase-locked loop output.
6. the noise-reduction method of receiver according to claim 4, it is characterized in that, the stage that controller is controlled the change of fixed frequency, comprise: control the switching action of the changeable frequency circuit that two above resistance in parallel and switch consist of, the whole resistance value of change changeable frequency circuit, the stage of change fixed frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110354584.9A CN103107819B (en) | 2011-11-10 | 2011-11-10 | Noise reduction device of receiver and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110354584.9A CN103107819B (en) | 2011-11-10 | 2011-11-10 | Noise reduction device of receiver and method thereof |
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| CN103107819A true CN103107819A (en) | 2013-05-15 |
| CN103107819B CN103107819B (en) | 2017-03-22 |
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| CN201110354584.9A Active CN103107819B (en) | 2011-11-10 | 2011-11-10 | Noise reduction device of receiver and method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540874A (en) * | 2003-04-21 | 2004-10-27 | 夏普株式会社 | PLL circuit and TV receiver using it, and improvement in beat of TV receiver |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540874A (en) * | 2003-04-21 | 2004-10-27 | 夏普株式会社 | PLL circuit and TV receiver using it, and improvement in beat of TV receiver |
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| CN103107819B (en) | 2017-03-22 |
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