CN105578158A - Integrated cascadable optical fiber tuner module - Google Patents
Integrated cascadable optical fiber tuner module Download PDFInfo
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- CN105578158A CN105578158A CN201610108448.4A CN201610108448A CN105578158A CN 105578158 A CN105578158 A CN 105578158A CN 201610108448 A CN201610108448 A CN 201610108448A CN 105578158 A CN105578158 A CN 105578158A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses an integrated cascadable optical fiber tuner module, relates to the technical field of the digital video broadcast, especially an optical fiber tuner module which is compact in structure, low in cost and supportable in cascading and an optical fiber set top box applying the module. The technical key point of the invention is that the module comprises a light source, an optical fiber access end, a photoelectric conversion circuit, an impedance matching circuit, a preamplifier, a denoising filter, a self-adaption signal enhancement circuit, a first automatic gain amplifier, a power divider, a frequency converter, a local frequency generation circuit, an intermediate-frequency filter, a second automatic gain amplifier, a demodulation circuit, a decoding circuit, a television signal leading-out end and a cascade signal leading-out end; the power supply supplies power to each electric component in the set top box ; the optical fiber access end, the photoelectric conversion circuit, the impedance matching circuit, the preamplifier and the denoising filter are sequentially connected.
Description
Technical field
The present invention relates to digital TV Broadcasting Techniques field, particularly a kind of compact optical fiber set-top box circuitry of support cascade supported the optical fiber receiver turning module of cascade and apply this module.。
Background technology
China's digital TV broadcast signal transmission and distribution roughly experienced by three phases:
First stage:
The transmission of early stage digital TV broadcast signal and distribution, after broadcast singal exports from the modulation of digital front-end machine room, transmit along trunk cable, in transmitting procedure, need to increase trunk amplifier amplify signal, when signal is sent to community, to building, need to increase distributor and Lou Dong amplifier, then be admitted to subscriber household through splitter.
Because cable transmission is to signal of telecommunication loss comparatively large (every 500 meters of about 25-40dB), need to increase a large amount of amplifiers in transmitting procedure, and the power supply of these amplifiers, joint etc. all can increase signal disturbing, reduce transmission quality, so be generally suitable for the signal transmission within 3 kilometers.Due to the defect that cable transmits, therefore a large amount of HFC and the Hybrid Fiber Coaxial of using of broadcasting and TV transmission is now transmitted.
Second stage:
HFC Hybrid Fiber Coaxial, refer to that broadcast singal is after digital front-end machine room completes modulation, light signal is converted electrical signals to through optical sender equipment, in the form of light along Optical Fiber Transmission, because the loss of optical fiber to signal transmission is less, on average every kilometer only has 0.2dB, can accomplish that 20 km transmission are non-relay, farther distance can be passed the signal to, after arriving community to light signal, use optical receiver equipment that light signal is converted to the signal of telecommunication, then enter coaxial cable distribution net network, enter family through amplifier, distributor, splitter.
Phase III:
In recent years, due to the significantly downslide of optical fiber and optical device, light device price, the especially reduction greatly of amplitude loss objective, various places broadcasting and TV Transmission Co., Ltd starts the construction carrying out all optical network.Namely after broadcasting and TV optical signal transmission arrives community, no longer be converted to the signal of telecommunication and enter coaxial cable distribution net network, but directly light signal is distributed, optical fiber directly arrives family, broadcasting and TV conversion is carried out at user's family recycling small light receiver device, transmission system no longer needs a large amount of amplifiers, and decrease the requirement that it is powered, not only greatly reduce the generation of the loss of signal and interference, the reliability of transmission system, maintainability promotes greatly, construction cost and maintenance cost reduce greatly, and be far better than the signal of telecommunication due to the anti-interference of light, and transmission bandwidth is wider, more programme information can be transmitted to user's family, comprise tens cover high-definition television programs, utilize wavelength-division multiplex technique can also realize the duplex transmission of uplink and downlink signals, meet the integration of three networks requirement that client is undertaken by CHINA RFTCOM Co Ltd surfing the Net, therefore broadcasting and TV fiber entering household obtains extensive popularization throughout the country, the industry standard that newly-built community CHINA RFTCOM Co Ltd is built is also become in 2015.
The change of this transmission means brings following problem:
Realize the family of broadcasting and TV fiber entering household, its Drop cable joint can not directly access original CATV set-top-box, in order to not waste the resource of original CATV set-top-box, broadcasting and TV Transmission Co., Ltd needs to continue to use the client of CATV set-top-box to be equipped with an external small light receiver terminal equipment to these, after fiber-optic signal accesses this equipment, be converted to the cable TV signal of telecommunication, be transferred to the input of former CATV set-top-box through coaxial cable, after tuning, demodulation, decoding, be converted to standard television signal carry out program viewing.But this pattern is only applicable to the user to the less demanding grown-ups and children district of program quality.
For not providing the newly-built community of CATV set-top-box and requiring higher user to program quality, then for client provide brand-new can the Digital Television optical fiber Set Top Box of direct incoming fiber optic signal, former external small light receiver device is designed to a built-in module by this Set Top Box, be integrated in the signal input part of Set Top Box after Set Top Box inside realizes opto-electronic conversion, tuning reception is carried out, as Fig. 1 again through inner coaxial transit cable access tuner module.Such design, original external optical receiver terminal equipment and CATV set-top-box equipment are integrated and become an equipment, relatively, a kind of mode reduces equipment cost, and new equipment is promoted by circuit performance and adds high-definition program rating function, therefore improves equipment performance again.
As seen from Figure 1, existing Digital Television optical fiber Set Top Box is built-in optical receiver and tuner two modules, optical receiver module is arranged on before the input stage of tuner module, the output of optical receiver module and the input of tuner module are interconnected with coaxial transit cable, realize signal and are sent to tuner module from optical receiver module.
TV signal Drop cable access Digital Television optical fiber Set Top Box, first optical receiver module is inserted, light signal is converted to the signal of telecommunication by photoelectric switching circuit, after impedance matching, amplification, filtering, Attenuation adjustable, secondary amplify, the wide band radio-frequency modulation signal of output level amplitude stabilization, transfer through coaxial cable, access TV tuner module, again through impedance matching, filtering, amplification, frequency conversion, complete tuning reception, through intermediate frequency filtering and amplification, the intermediate-freuqncy signal of output level amplitude stabilization.After being converted to standard television signal by the inner follow-up demodulation of Set Top Box, decoding circuit, play by external cable access television set.
But adopt the optical fiber Set Top Box of prior art still to come with some shortcomings:
Optical receiver module and the tuner module of existing optical fiber Set Top Box all design according to existing industry standard, produce, and existing industry standard is in order to meet the output of single optical receiver module, the input of single tuner module can adapt to that the place in circuit of multiple types as far as possible proposes, in order to meet this requirement, industry standard adds some circuit modules in optical receiver module and single tuner module, and when such optical receiver module and telegon module are linked together, these circuit module effects are not very large, add production cost and the volume of Set Top Box on the contrary.
In addition, existing optical fiber Set Top Box can not support cascade function, but the lifting of social life level, increasing family has the television set of more than two, because broadcasting and TV Drop cable only has an optical fiber, a Digital Television optical fiber Set Top Box can only be accessed, user needs to install optical branching device voluntarily in own home, separate more optical fiber splice and could access more optical fiber Set Top Box, but this way, a road light signal of registering one's residence not only is made to be divided into multichannel, greatly reduce the light signal strength of incoming fiber optic Set Top Box along separate routes, have a strong impact on the TV receiving effect of optical fiber Set Top Box, cause easily occurring mosaic, and user needs to destroy house decoration, or directly walks optical fiber open-wire line, difficulty of construction is large, and technical complexity is high, more seriously, this way, the non-optical-fiber type CATV set-top-box needs that user had originally are eliminated and are changed or upgrading ancillary equipment, increase burden for users.
Summary of the invention
Technical problem to be solved by this invention is: for above-mentioned Problems existing, provides the optical fiber receiver turning module that a kind of compact conformation, production cost are low, support cascade, and applies the compact optical fiber Set Top Box of this module.
The technical solution used in the present invention is as follows: comprise shell, power supply, optical receiver that gain amplifier is adjustable and tuner; Described optical receiver, tuner and power supply are all packaged in described shell; In described enclosure, the output of optical receiver is connected with the input of tuner, and power supply is used for powering to optical receiver and tuner; The input of optical receiver and the output of tuner are all drawn from described shell; The output of tuner comprises cascade signal exit and intermediate-freuqncy signal output.
Further, optical receiver comprises intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter, adaptive signal enhancement circuit; Tuner comprises automatic gain amplifier 1, power splitter, frequency converter, local frequency generating circuit, intermediate-frequency filter and automatic gain amplifier 2.
Power supply is used for powering to each consuming parts in set-top box circuitry.
Described optic fibre input end is the input of optical receiver.Described intelligent acess end, photoelectric switching circuit, impedance matching circuit are linked in sequence, first signal output part of impedance matching circuit is connected with the input of preamplifier, the secondary signal output of impedance matching circuit is connected with the first input end of comparator in adaptive signal enhancement circuit, and the output of preamplifier is connected with the input of denoising filter;
The signal that adaptive signal enhancement circuit exports for receiving denoising filter, outputs to automatic gain amplifier 1 after carrying out self adaptation enhancing according to the strong and weak signal exported denoising filter of the signal of impedance matching circuit second output output.
The signal output part of automatic gain amplifier 1 is connected with the signal input part of power splitter, first signal output part of power splitter is connected with the first signal input part of frequency converter, the secondary signal output of power splitter is connected with cascade signal exit, and the signal output part of local frequency generating circuit is connected with the secondary signal input of described frequency converter;
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output are linked in sequence.
Preferably, described adaptive signal enhancement circuit carries out self adaptation enhancing for outputing signal the strong and weak signal to denoising filter output according to impedance matching circuit second.
Preferably, described adaptive signal enhancement circuit comprises comparator, two-stage amplifier and either-or switch.
The signal output part of denoising filter is connected with the first signal input part of either-or switch on the one hand, also be connected with the signal input part of two-stage amplifier on the other hand, the signal output part of two-stage amplifier is connected with the secondary signal input of either-or switch, and the signal output part of either-or switch is connected with the signal input part of automatic gain amplifier 1.
The secondary signal output of impedance matching circuit is also connected with the first input end of comparator, and the second input of comparator connects the reference data signal of telecommunication, and the output of comparator is connected with the control end of either-or switch.
Preferably, described local frequency generating circuit comprises controller, phase-locked loop and local oscillator; Described controller and phase-locked loop have signal and are connected; Phase-locked loop and local oscillator have signal and are connected; The signal output part of local oscillator is connected with the secondary signal input of frequency converter.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, production technology is simple, and production cost is low
From the production technology of Digital Television optical fiber Set Top Box, after adopting the present invention, the production of Digital Television optical fiber Set Top Box, only need erection welding module, relatively need now erection welding optical receiver and tuner two modules, and an assembling coaxial cable, production process needs 3-4 to reduce to 1 production process from present, production efficiency is higher, and productive manpower cost, cost of supplementary product, quality cost are lower.
From the production management and control angle of Digital Television optical fiber Set Top Box, from present needs two modules and a cable totally three assemblies, reduce to and only need a module, the resources of production such as buying, neat cover, inspection take less relatively, reduce further production cost.
From the production angle of module, only produce a module and just can replace present production two modules and a cable, production technology significantly simplifies, and greatly reduces the production costs such as issuance of materials, production, inspection, examination at random, packaging, transport simultaneously.
2, optimize circuit to form and production technology, improve product quality
From quality and powder injection molding, after reducing to one from three assemblies, component count reduces, circuit forms more to optimize simplifies, production process reduces to 1 from 3-4, and the product quality of Digital Television optical fiber Set Top Box can obviously be promoted, and, effectively prevent index and the size matching problem of present three inter-modules, product failure rate and quality risk also can reduce further.
3, material cost is reduced
The present invention only needs one group of power subsystem and metallic shielding structure part, and internal circuit blocks quantity also greatly reduces, and does not need expensive coaxial transit cable, greatly reduces material cost.
4, reduce circuit space, be more suitable for product miniaturization
Volume of the present invention is less, for Digital Television optical fiber Set Top Box, only needs less internal circuit space, meets the development trend of digital terminal product miniaturization.
5, cascaded-output function is added,
The present invention reducing costs, volume, reduce on the basis of production process, also add cascaded-output function, be adapted to the demand of one family multiple TV set viewing digital television program.It should be noted that to be different from prior art and cascaded-output signal is drawn from tuning part, cascaded-output signal of the present invention is drawn from light receiving part, therefore the present invention both can be used as optical fiber receiver turning module and had directly used, can also as simple light receiver module, increase simple peripheral circuit and become an external optical receiver equipment use, the light signal that optical fiber inputs is converted to the input signal of existing CATV set-top-box, CATV set-top-box existing in user family is used.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is prior art and the circuit being applied to Digital Television optical fiber Set Top Box.
Fig. 2 is circuit of the present invention and the circuit being applied to Set Top Box.
Fig. 3 is the connection diagram of the present invention when being applied to Set Top Box in cascade situation.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
First embodiment
The present embodiment comprises shell, power supply, optical receiver that gain amplifier is adjustable and tuner; Described optical receiver, tuner and power supply are all packaged in described shell; In described enclosure, the output of optical receiver is connected with the input of tuner, and power supply is used for powering to optical receiver and tuner; The input of optical receiver and the output of tuner are all drawn from described shell; The output of tuner comprises cascade signal exit and intermediate-freuqncy signal output.
Concrete, optical receiver comprises intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter and adaptive signal enhancement circuit.Tuner comprises automatic gain amplifier 1, power splitter, frequency converter, local frequency generating circuit, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output and cascade signal exit.
Power supply is used for can each consuming parts in the optical fiber receiver turning modular circuit of cascade powering to the present invention.
Intelligent acess end is the input of optical receiver.Described intelligent acess end and photoelectric switching circuit, impedance matching circuit are linked in sequence, first signal output part of impedance matching circuit is connected with the input of preamplifier, the secondary signal output of impedance matching circuit is connected with the first input end of comparator in adaptive signal enhancement circuit, and the output of preamplifier is connected with the input of denoising filter;
The signal that adaptive signal enhancement circuit exports for receiving denoising filter, outputs to automatic gain amplifier 1 after carrying out self adaptation enhancing according to the strong and weak signal exported denoising filter of the signal of impedance matching circuit second output output.
The signal output part of automatic gain amplifier 1 is connected with the signal input part of power splitter, first signal output part of power splitter is connected with the first signal input part of frequency converter, the secondary signal output of power splitter is connected with cascade signal exit, and the signal output part of local frequency generating circuit is connected with the secondary signal input of described frequency converter.
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output are linked in sequence.
This medium frequency output end is as the output of the present invention's integration module, signal input part for the demodulator circuit inner follow-up with Set Top Box is connected, the signal output part of demodulator circuit is connected with the signal input part of decoding circuit, and the signal output part of decoding circuit is connected with TV signal exit.
In other embodiments, photoelectric switching circuit can be realized by light electric transducer.Described local frequency generating circuit comprises controller, phase-locked loop and local oscillator; Described controller and phase-locked loop have signal and are connected; Phase-locked loop and local oscillator have signal and are connected; The signal output part of local oscillator is connected with the secondary signal input of frequency converter.
TV light signal is by optic fibre input end access Digital Television optical fiber Set Top Box, light signal is converted to the signal of telecommunication by photoelectric switching circuit, applicable impedance is converted electrical signals to after impedance matching circuit, through preamplifier, 20dB is amplified to the signal of telecommunication after impedance matching, choose the signal component of the corresponding television signal modulation frequency after amplification in the signal of telecommunication again through denoising filter, adaptive signal enhancement circuit outputs signal the strong and weak signal to denoising filter output according to impedance matching circuit second to be strengthened.
Signal after self adaptation strengthens is amplified further by automatic gain amplifier 1 pair of television modulation signal, its signal amplitude is stablized, reduce because the change of input optical fibre signal amplitude is on the impact of signal strength signal intensity, signal access power splitter after amplification, this power splitter unit makes the signal after automatic gain amplifier 1 amplifies be divided into two, one tunnel access frequency converter unit, another road exports as cascade signal, and this cascade signal can the CATV transmission path of direct access user family.
The local frequency of another input access local oscillator generation of frequency converter, controller controls phase-locked loop adjustment local frequency, the signal of telecommunication after itself and two-stage are amplified forms a stable difference on the frequency, frequency converter export two input signals frequency and and difference frequency, this difference frequency signal is selected through intermediate-frequency filter, through automatic gain amplifier 2, this intermediate-freuqncy signal is amplified again, the intermediate-freuqncy signal of output level amplitude stabilization.This intermediate-freuqncy signal is play by external cable access television set after being converted to standard television signal by the inner follow-up demodulating unit of Set Top Box, decoding unit.
In other embodiments, adaptive signal enhancement circuit outputs signal according to impedance matching circuit second and strong and weak carries out self adaptation enhancing to the signal that denoising filter exports.
Second embodiment
As Fig. 2, the adaptive signal enhancement circuit in the present embodiment comprises comparator, two-stage amplifier and either-or switch.
The signal output part of denoising filter is connected with the first signal input part of either-or switch on the one hand, also be connected with the signal input part of two-stage amplifier on the other hand, the signal output part of two-stage amplifier is connected with the secondary signal input of either-or switch, and the signal output part of either-or switch is connected with the signal input part of automatic gain amplifier 1.
The secondary signal output of impedance matching circuit is also connected with the first input end of comparator, and the second input of comparator connects the reference data signal of telecommunication, and the output of comparator is connected with the control end of either-or switch.
Comparator receives impedance matching circuit second output signal voltage, the reference voltage of itself and benchmark is compared, the comparator output low level when being less than reference voltage, otherwise then export high level, the level that comparator exports is for controlling the switching of either-or switch, the output signal of the two-stage amplifier that either-or switch selects access newly-increased during low level, during high level, either-or switch selects the signal directly accessing denoising filter output, thus ensure that when photoelectric conversion unit amplitude output signal is less, this signal demand amplifies through preamplifier and two-stage amplifier two-stage could access automatic gain amplifier 1, when photoelectric conversion unit amplitude output signal is larger, this signal only needs to amplify just access automatic gain amplifier 1 through pre-amplifier unit one-level.Regulate the height of comparator reference voltage, the benchmark that this compares can be changed.
Application Example
Suppose that in one family, parlor is furnished with a television set, is also furnished with a television set in addition in bedroom, an existing CATV set-top-box in family.
As Fig. 3, Drop cable is connected with the intelligent acess end comprising TV set-top box of the present invention, the TV signal exit of TV set-top box is connected with living-room TV machine, and cascade signal exit of the present invention is connected by cable, CATV set-top-box and another TV of being positioned at bedroom.
The present invention is also applicable to the situation that family only has a television set and a CATV set-top-box, and now, cascade signal exit of the present invention is connected with TV by cable, CATV set-top-box.
Visible, the present invention not only can realize cascade function, also can be used as Digital Television light/signal of telecommunication modular converter, CATV set-top-box existing in user family is re-used.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (8)
1. integration can the optical fiber receiver turning module of cascade, it is characterized in that, comprises shell, power supply, optical receiver that gain amplifier is adjustable and tuner;
Described optical receiver, tuner and power supply are all packaged in described shell;
In described enclosure, the output of optical receiver is connected with the input of tuner, and power supply is used for powering to optical receiver and tuner;
The input of optical receiver and the output of tuner are all drawn from described shell;
The output of tuner comprises cascade signal exit and intermediate-freuqncy signal output.
2. a kind of integration according to claim 1 can the optical fiber receiver turning module of cascade, it is characterized in that, described receiver comprises intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter and adaptive signal enhancement circuit;
Optic fibre input end is the input of optical receiver; Described intelligent acess end, photoelectric switching circuit, impedance matching circuit are linked in sequence, and the first signal output part of impedance matching circuit is connected with the input of preamplifier, and the output of preamplifier is connected with the input of denoising filter;
The signal that adaptive signal enhancement circuit exports for receiving denoising filter, and carry out exporting after self adaptation strengthens according to the strong and weak signal exported denoising filter of signal that impedance matching circuit second output exports;
The output of adaptive signal enhancement circuit is the output of optical receiver.
3. a kind of integration according to claim 1 and 2 can the optical fiber receiver turning module of cascade, it is characterized in that, described tuner comprises automatic gain amplifier 1, power splitter, frequency converter, local frequency generating circuit, intermediate-frequency filter and automatic gain amplifier 2;
The signal input part of automatic gain amplifier 1 is the input of tuner; The signal output part of automatic gain amplifier 1 is connected with the signal input part of power splitter, first signal output part of power splitter is connected with the first signal input part of frequency converter, the secondary signal output of power splitter is connected with cascade signal exit, and the signal output part of local frequency generating circuit is connected with the secondary signal input of described frequency converter;
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output are linked in sequence.
4. a kind of integration according to claim 2 can the optical fiber receiver turning module of cascade, and it is characterized in that, described adaptive signal enhancement circuit comprises comparator, two-stage amplifier and either-or switch;
The signal output part of denoising filter is connected with the first signal input part of either-or switch on the one hand, also be connected with the signal input part of two-stage amplifier on the other hand, the signal output part of two-stage amplifier is connected with the secondary signal input of either-or switch, and the signal output part of either-or switch is connected with the signal input part of automatic gain amplifier 1;
The secondary signal output of impedance matching circuit is also connected with the first input end of comparator, and the second input of comparator connects the reference data signal of telecommunication, and the output of comparator is connected with the control end of either-or switch.
5. according to claim 3 a kind of can the optical fiber receiver turning modular circuit of cascade, it is characterized in that, described local frequency generating circuit comprises controller, phase-locked loop and local oscillator; Described controller and phase-locked loop have signal and are connected; Phase-locked loop and local oscillator have signal and are connected; The signal output part of local oscillator is connected with the secondary signal input of frequency converter.
6. an integration can the optical fiber receiver turning module of cascade, it is characterized in that, comprise power supply, intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter, adaptive signal enhancement circuit, automatic gain amplifier 1, power splitter, frequency converter, local frequency generating circuit, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output and cascade signal exit;
Power supply is used for powering to each consuming parts in optical fiber receiver turning modular circuit;
Described intelligent acess end, photoelectric switching circuit, impedance matching circuit are linked in sequence, and the first signal output part of impedance matching circuit is connected with the input of preamplifier, and the output of preamplifier is connected with the input of denoising filter;
The signal that adaptive signal enhancement circuit exports for receiving denoising filter, outputs to automatic gain amplifier 1 after carrying out self adaptation enhancing according to the strong and weak signal exported denoising filter of the signal of impedance matching circuit second output output;
The signal output part of automatic gain amplifier 1 is connected with the signal input part of power splitter, first signal output part of power splitter is connected with the first signal input part of frequency converter, the secondary signal output of power splitter is connected with cascade signal exit, and the signal output part of local frequency generating circuit is connected with the secondary signal input of described frequency converter;
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output are linked in sequence.
7. a kind of integration according to claim 6 can the optical fiber receiver turning module of cascade, and it is characterized in that, described adaptive signal enhancement circuit comprises comparator, two-stage amplifier and either-or switch;
The signal output part of denoising filter is connected with the first signal input part of either-or switch on the one hand, also be connected with the signal input part of two-stage amplifier on the other hand, the signal output part of two-stage amplifier is connected with the secondary signal input of either-or switch, and the signal output part of either-or switch is connected with the signal input part of automatic gain amplifier 1;
The secondary signal output of impedance matching circuit is also connected with the first input end of comparator, and the second input of comparator connects the reference data signal of telecommunication, and the output of comparator is connected with the control end of either-or switch.
8. a kind of integration according to claim 6 can the optical fiber receiver turning module of cascade, and it is characterized in that, described local frequency generating circuit comprises controller, phase-locked loop and local oscillator; Described controller and phase-locked loop have signal and are connected; Phase-locked loop and local oscillator have signal and are connected; The signal output part of local oscillator is connected with the secondary signal input of frequency converter.
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| CN109922748A (en) * | 2016-08-01 | 2019-06-21 | 德雷塞尔大学 | Device and method for handling skin conditions |
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| CN109922748A (en) * | 2016-08-01 | 2019-06-21 | 德雷塞尔大学 | Device and method for handling skin conditions |
| US11571249B2 (en) | 2016-08-01 | 2023-02-07 | Drexel University | Devices and methods for treatment of skin conditions |
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| CN105578158B (en) | 2018-06-08 |
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