CN105578158B - A kind of integration can cascade optical fiber reception tuner module - Google Patents
A kind of integration can cascade optical fiber reception tuner module Download PDFInfo
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- CN105578158B CN105578158B CN201610108448.4A CN201610108448A CN105578158B CN 105578158 B CN105578158 B CN 105578158B CN 201610108448 A CN201610108448 A CN 201610108448A CN 105578158 B CN105578158 B CN 105578158B
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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
-
- 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
Abstract
The invention discloses a kind of integration can cascade optical fiber receive tuner module, be related to digital TV Broadcasting Techniques field, it is desirable to provide it is a kind of it is compact-sized, production cost is low, support the optical fiber set-top box group that cascade optical fiber receives the tuner module and application module into.Technical key point：Including 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, demodulator circuit, decoding circuit, TV signal exit and cascade signal exit.Power supply is for each consuming parts power supply into set-top box circuitry.The intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter are linked in sequence.
Description
Technical field
The present invention relates to digital TV Broadcasting Techniques fields, particularly a kind of that cascade optical fiber is supported to receive tuner module
And the cascade compact optical fiber set-top box circuitry of support using the module.
Background technology
China's digital TV broadcast signal transmission and distribution substantially experienced three phases：
First stage：
The transmission and distribution of the digital TV broadcast signal of early stage, broadcast singal from digital front-end computer room modulation output after,
It is transmitted along trunk cable, being needed in transmission process, which increases trunk amplifier, is amplified signal, when signal is transmitted
To cell, to building, need to increase distributor and Lou Dong amplifiers, then subscriber household is admitted to through splitter.
Since cable transmission is larger to electric signal loss（Every 500 meters of about 25-40dB）, need to increase in transmission process big
The amplifier of amount, and power supply, connector of these amplifiers etc. can all increase signal interference, transmission quality be reduced, so generally
The signal transmission being suitable within 3 kilometers.The defects of being transmitted due to cable, present broadcasting and TV transmission largely use HFC, that is, light
Fine Coax is transmitted.
Second stage：
HFC HPA Hybrid Fiber Coaxials refer to broadcast singal after digital front-end computer room completes modulation, by light emitting
Machine equipment converts electrical signals to optical signal, is transmitted in the form of light along optical fiber, since optical fiber is smaller to the loss for transmitting signal,
Average every kilometer only 0.2dB, can accomplish that 20 km transmissions are non-relay, can pass the signal to farther distance, to light
After signal reaches cell, electric signal is converted optical signals to using photoreceiver equipment, enters back into coaxial cable distribution net network, passed through
Amplifier, distributor, splitter enter family.
Phase III：
In recent years, due to optical fiber and optical device, the significantly downslide of light device price, especially amplitude loss objective is big
Big to reduce, various regions broadcasting and TV Transmission Co., Ltd proceeds by the construction of all optical network.After i.e. broadcasting and TV optical signal transmission reaches cell, no longer turn
It is changed to electric signal and enters coaxial cable distribution net network, but directly optical signal is allocated, optical fiber directly arrives family, in user family
In small light receiver device is recycled to carry out broadcasting and TV conversion, Transmission system no longer needs a large amount of amplifier, and reduces pair
Its requirement being powered not only greatly reduces the generation of the loss of signal and interference, reliability, the maintainability of Transmission system
It greatly promotes, construction cost and maintenance cost substantially reduce, and since the anti-interference of light is much stronger than electric signal, and conveyor
It is wide wider, more programme informations can be transmitted to user's family, including tens sets of high-definition television programs, utilize wavelength-division multiplex skill
Art can also realize the duplex transmission of uplink and downlink signals, meet the integration of three networks requirement that client is surfed the Internet by CHINA RFTCOM Co Ltd,
Therefore broadcasting and TV fiber entering household is widely popularized throughout the country, and newly-built community CHINA RFTCOM Co Ltd construction was also become in 2015
Professional standard.
The change of this transmission mode brings problems with：
Realize the family of broadcasting and TV fiber entering household, Drop cable connector cannot directly access original cable TV top
Box, in order not to waste the resource of original CATV set-top-box, broadcasting and TV Transmission Co., Ltd needs to be continuing with cable television to these
The client of set-top box is equipped with an external small light receiver terminal equipment, after fiber-optic signal accesses the equipment, has been converted to
Line TV electric signal is transferred to the input terminal of former CATV set-top-box through coaxial cable, is converted after tuned, demodulation, decoding
Program viewing is carried out for standard television signal.But this pattern is suitable only for the user of the old residential area of less demanding to program quality.
For not providing the newly-built community of CATV set-top-box and being then client to the higher user of program quality requirement
There is provided the completely new DTV optical fiber set-top box for being directly accessed fiber-optic signal, the set-top box is by former external small-sized light-receiving
Machine equipment is designed as the module built in one, and the signal input part for being integrated in set-top box realizes that photoelectricity turns inside set-top box
After changing, reception, such as Fig. 1 are tuned using internal coaxial transit cable access tuner module.Such design, makes original
The external photoreceiver terminal device and CATV set-top-box equipment come is integrated as an equipment, with respect to former side
Formula reduces equipment cost, and new equipment increases high-definition program rating function, therefore carry again by circuit performance promotion
Equipment performance is risen.
As seen from Figure 1, built-in two modules of photoreceiver and tuner of existing DTV optical fiber set-top box,
Photoreceiver module is mounted on before the input stage of tuner module, the output of photoreceiver module and the input of tuner module
It is connected with each other with coaxial transit cable, realizes that signal is transmitted to tuner module from photoreceiver module.
TV signal Drop cable accesses DTV optical fiber set-top box, is firstly inserted into photoreceiver module, passes through photoelectricity
Conversion circuit converts optical signals into electric signal, after impedance matching, amplification, filtering, Attenuation adjustable, two level amplification, output electricity
The wide band radio-frequency modulated signal of flat amplitude stabilization, transfers through coaxial cable, accesses TV tuner module, again passes by impedance
Match, filter, amplifying, frequency conversion, completing tuning and receive, by intermediate frequency filtering and amplification, the intermediate-freuqncy signal of output level amplitude stabilization.
After being converted to standard television signal by demodulation subsequent inside set-top box, decoding circuit, television set is accessed by external cable
It plays out.
However the optical fiber set-top box of the prior art is used to still have some shortcomings：
The photoreceiver module and tuner module of existing optical fiber set-top box are set according to existing professional standard
Meter, production, and existing professional standard is in order to meet the input energy of the output of single photoreceiver module, single tuner module
The access circuit proposition of multiple types as far as possible is adapted to, in order to meet this requirement, professional standard is in photoreceiver module and list
Some circuit modules are increased in a tuner module, and such photoreceiver module and coordinator module are linked together
When, the effect of these circuit modules is not very big, increases the production cost and volume of set-top box instead.
In addition, existing optical fiber set-top box cannot support cascade function, however the promotion of social standard of living, it is more and more
Family have the television set of two or more, since broadcasting and TV Drop cable only has an optical fiber, only have access a number electricity
Depending on optical fiber set-top box, user needs voluntarily to install optical branching device in own home, and separating more fibre-optical splices could access more
More optical fiber set-top boxes, but this way not only make the optical signal all the way registered one's residence be divided into multichannel, greatly reduce branch and be followed by
Enter the light signal strength of optical fiber set-top box, seriously affected the TV receiving effect of optical fiber set-top box, cause to be susceptible to Marseille
Gram；Moreover, user needs to destroy house decoration or directly walks optical fiber open-wire line, difficulty of construction is big, and technical complexity is high；
More seriously, this way, the non-optical-fiber type CATV set-top-box needs that user possessed originally, which are eliminated, to be replaced or upgrades
Peripheral equipment increases burden for users.
Invention content
The technical problems to be solved by the invention are：In view of the above problems, provide it is a kind of it is compact-sized, be produced into
This compact optical fiber set-top box low, that cascade optical fiber is supported to receive tuner module and the application module.
The technical solution adopted by the present invention is as follows：Including shell, power supply, the adjustable photoreceiver of gain amplifier and tuning
Device；The photoreceiver, tuner and power supply are packaged in the shell；In the enclosure, the output of photoreceiver
End is connect with the input terminal of tuner, and power supply is used to power to photoreceiver and tuner；The input terminal of photoreceiver and tuning
The output terminal of device is drawn from the shell；The output terminal of tuner includes cascade signal exit and intermediate-freuqncy signal exports
End.
Further, photoreceiver includes intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, goes
It makes an uproar wave filter, adaptive signal enhancement circuit；Tuner includes automatic gain amplifier 1, power splitter, frequency converter, local frequency
Circuit, intermediate-frequency filter and automatic gain amplifier 2 occurs.
Power supply is for each consuming parts power supply into set-top box circuitry.
The optic fibre input end is the input terminal of photoreceiver.The intelligent acess end, photoelectric switching circuit, impedance matching
Circuit sequence connects, and the first signal output end of impedance matching circuit and the input terminal of preamplifier connect, impedance matching electricity
The second signal output terminal on road is connect with the first input end of comparator in adaptive signal enhancement circuit, preamplifier it is defeated
The input terminal of outlet and denoising filter connects；
Adaptive signal enhancement circuit is used to receive the signal of denoising filter output, defeated according to impedance matching circuit second
The signal strength of outlet output carries out the signal that denoising filter exports to be output to automatic gain amplifier after adaptively enhancing
1。
The signal output end of automatic gain amplifier 1 and the signal input part of power splitter connect, the first signal of power splitter
First signal input part of output terminal and frequency converter connects, and second signal output terminal and the cascade signal exit of power splitter connect
It connects, the signal output end of local frequency generating circuit is connect with the second signal input terminal of the frequency converter；
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output terminal are linked in sequence.
Preferably, the adaptive signal enhancement circuit is used for according to impedance matching circuit the second output signal power to going
The signal of wave filter of making an uproar output is adaptively enhanced.
Preferably, the adaptive signal enhancement circuit includes comparator, two-stage amplifier and either-or switch.
On the one hand the signal output end of denoising filter is connect with the first signal input part of either-or switch, on the other hand
It is also connect with the signal input part of two-stage amplifier, the signal output end of two-stage amplifier and the second signal of either-or switch are defeated
Enter end connection, the signal output end of either-or switch is connect with the signal input part of automatic gain amplifier 1.
The second signal output terminal of impedance matching circuit is also connect with the first input end of comparator, and the second of comparator is defeated
Enter end connection reference data electric signal, the output terminal of comparator and the control terminal of either-or switch connect.
Preferably, the local frequency generating circuit includes controller, phaselocked loop and local oscillator；The controller with
Phaselocked loop is connected with signal；Phaselocked loop with local oscillator there is signal to connect；The signal output end of local oscillator and change
The second signal input terminal connection of frequency device.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, simple production process, production cost are low
From the point of view of the production technology of DTV optical fiber set-top box, after applying the present invention, DTV optical fiber set-top box
Production, it is only necessary to which one module of erection welding needs two modules of erection welding photoreceiver and tuner and dress now relatively
With a coaxial cable, production process needs 3-4 to be reduced to 1 production process from present, and production efficiency higher produces people
Work cost, cost of supplementary product, quality cost are lower.
From the production management and control angle of DTV optical fiber set-top box, from present two modules of needs and a cable totally three
A component is reduced to only one module of needs, and the resources of production occupancy such as buying, neat set, inspection relatively is less, further reduced
Production cost.
From the point of view of the production angle of module, only one module of production just can replace present two modules of production and an electricity
Cable, production technology significantly simplifies, while greatly reduces the production costs such as material issuing, production, inspection, examination at random, packaging, transport.
2nd, circuit composition and production technology are optimized, improves product quality
From the point of view of quality and powder injection molding, after three components are reduced to one, component count is reduced, and circuit is formed more
Optimization is simplified, and production process is reduced to 1 from 3-4, and the product quality of DTV optical fiber set-top box can be obviously improved,
Also, the index and size matching problem of present three inter-modules are effectively prevented, product failure rate and quality risk can also be into
One step reduces.
3rd, material cost is reduced
The present invention only needs one group of power supply unit and metallic shielding structure part, internal circuit blocks quantity also to greatly reduce,
And expensive coaxial transit cable is not needed to, greatly reduces material cost.
4th, circuit space is reduced, is more suitable for product miniaturization
Volume smaller of the present invention, for DTV optical fiber set-top box, it is only necessary to which smaller internal circuit space meets number
The development trend of word terminal product miniaturization.
5th, cascaded-output function is increased,
The present invention is reducing cost, volume, on the basis of reducing production process, also adds cascaded-output function, adapts to
In the demand of one family multiple TV set viewing digital television program.It should be noted that different from the prior art will cascade
Output signal is drawn from tuning part, and cascaded-output signal of the invention is drawn from light receiving part, therefore the present invention was both
Optical fiber can be used as to receive tuner module directly to use, simple photoreceiver module is also used as, increases simple peripheral circuit
It is used as an external photoreceiver equipment, the optical signal that optical fiber inputs is converted to the input of existing CATV set-top-box
Signal uses CATV set-top-box existing in user family.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the prior art and the circuit applied to DTV optical fiber set-top box.
Fig. 2 is the circuit of the present invention and the circuit applied to set-top box.
Fig. 3 be the present invention be applied to set-top box when in the case that cascade connection diagram.
Specific embodiment
All features or disclosed all methods disclosed in this specification or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification, unless specifically stated, can be equivalent by other or with similar purpose
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
First embodiment
The present embodiment includes shell, power supply, the adjustable photoreceiver of gain amplifier and tuner；The photoreceiver, tune
Humorous device and power supply are packaged in the shell；In the enclosure, the output terminal of photoreceiver and the input terminal of tuner
Connection, power supply are used to power to photoreceiver and tuner；The input terminal of photoreceiver and the output terminal of tuner are from described
It is drawn on shell；The output terminal of tuner includes cascade signal exit and intermediate-freuqncy signal output terminal.
Specifically, photoreceiver includes intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, goes
It makes an uproar wave filter and adaptive signal enhancement circuit.Tuner includes automatic gain amplifier 1, power splitter, frequency converter, local frequency
Circuit, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output terminal and cascade signal exit occurs.
Power supply be used for the present invention can cascade optical fiber receive each consuming parts power supply in tuner modular circuit.
Intelligent acess end is the input terminal of photoreceiver.The intelligent acess end and photoelectric switching circuit, impedance matching electricity
Road is linked in sequence, and the first signal output end of impedance matching circuit and the input terminal of preamplifier connect, impedance matching circuit
Second signal output terminal connect with the first input end of comparator in adaptive signal enhancement circuit, the output of preamplifier
End is connect with the input terminal of denoising filter；
Adaptive signal enhancement circuit is used to receive the signal of denoising filter output, defeated according to impedance matching circuit second
The signal strength of outlet output carries out the signal that denoising filter exports to be output to automatic gain amplifier after adaptively enhancing
1。
The signal output end of automatic gain amplifier 1 and the signal input part of power splitter connect, the first signal of power splitter
First signal input part of output terminal and frequency converter connects, and second signal output terminal and the cascade signal exit of power splitter connect
It connects, the signal output end of local frequency generating circuit is connect with the second signal input terminal of the frequency converter.
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output terminal are linked in sequence.
Output of the medium frequency output end as module of the invention integrated, for demodulator circuit subsequent inside set-top box
Signal input part connection, the signal input part of the signal output end of demodulator circuit and decoding circuit connects, the letter of decoding circuit
Number output terminal is connect with TV signal exit.
In other embodiments, photoelectric switching circuit can be realized by light electric transducer.The local frequency generating circuit packet
Include controller, phaselocked loop and local oscillator；The controller with phaselocked loop there is signal to connect；Phaselocked loop and local oscillator
It is connected with signal；The signal output end of local oscillator and the second signal input terminal of frequency converter connect.
TV optical signal accesses DTV optical fiber set-top box by optic fibre input end, is believed light by photoelectric switching circuit
Number electric signal is converted into, suitable impedance is converted electrical signals to after impedance matching circuit, through preamplifier to impedance
Electric signal amplification 20dB after matching, then correspondence television signal modulation frequency after denoising filter chooses amplification in electric signal
Signal component, adaptive signal enhancement circuit export denoising filter according to impedance matching circuit the second output signal power
Signal is enhanced.
Television modulation signal is further put by automatic gain amplifier 1 by adaptive enhanced signal
Greatly, stablize its signal amplitude, reduce influence of the variation because of input optical fibre signal amplitude to signal strength, amplified signal
Power splitter is accessed, which makes to be divided into two through 1 amplified signal of automatic gain amplifier, accesses frequency converter all the way
Unit, another way are exported as cascade signal, which can be directly accessed the CATV transmission access of user's family.
The local frequency that another input terminal access local oscillator of frequency converter generates, controller control phaselocked loop adjustment
Local frequency makes itself and the amplified electric signal of two-stage form a stable difference on the frequency, and frequency converter exports two input signals
Frequency and and difference frequency, select the difference frequency signal, then through automatic gain amplifier 2 in this by intermediate-frequency filter
Frequency signal is amplified, the intermediate-freuqncy signal of output level amplitude stabilization.The intermediate-freuqncy signal passes through demodulation subsequent inside set-top box
After unit, decoding unit are converted to standard television signal, television set is accessed by external cable and is played out.
In other embodiments, adaptive signal enhancement circuit according to impedance matching circuit the second output signal power to going
The signal of wave filter of making an uproar output is adaptively enhanced.
Second embodiment
Such as Fig. 2, the adaptive signal enhancement circuit in the present embodiment is opened including comparator, two-stage amplifier and alternative
It closes.
On the one hand the signal output end of denoising filter is connect with the first signal input part of either-or switch, on the other hand
It is also connect with the signal input part of two-stage amplifier, the signal output end of two-stage amplifier and the second signal of either-or switch are defeated
Enter end connection, the signal output end of either-or switch is connect with the signal input part of automatic gain amplifier 1.
The second signal output terminal of impedance matching circuit is also connect with the first input end of comparator, and the second of comparator is defeated
Enter end connection reference data electric signal, the output terminal of comparator and the control terminal of either-or switch connect.
Comparator receives the second output signal voltage of impedance matching circuit, and the reference voltage of itself and benchmark is compared,
The comparator output low level when less than reference voltage, on the contrary then export high level, the level of comparator output is for control two
Select the switching of a switch, the output signal of the newly-increased two-stage amplifier of either-or switch selection access during low level, during high level
Either-or switch selection is directly accessed the signal of denoising filter output, works as photoelectric conversion unit output signal width so as to ensure that
When degree is smaller, which needs that by preamplifier and the amplification of two-stage amplifier two-stage automatic gain amplifier 1 could be accessed；
When photoelectric conversion unit amplitude output signal is larger, which only needs just to access by the amplification of pre-amplifier unit level-one
Automatic gain amplifier 1.Adjust the height of comparator reference voltage, thus it is possible to vary the benchmark compared.
Application Example
Assuming that parlor is furnished with a television set in one family, a television set is in addition also equipped in bedroom, is had in family
One CATV set-top-box.
Such as Fig. 3, Drop cable is connect with the intelligent acess end of the TV set-top box comprising the present invention, TV set-top box
TV signal exit is connected with living-room TV machine, and cascade signal exit of the invention passes through cable, CATV set-top-box
It is connect with another TV positioned at bedroom.
It is suitable for family only has the situation of a television set and a CATV set-top-box, at this point, this hair
Bright cascade signal exit is connected by cable, CATV set-top-box and TV.
As it can be seen that the present invention can not only realize cascade function, DTV optical electrical signal conversion module is alternatively arranged as, it will
Existing CATV set-top-box re-uses in user family.
The invention is not limited in aforementioned specific embodiments.The present invention, which expands to, any in the present specification to be disclosed
The step of new feature or any new combination and any new method or process disclosed or any new combination.
Claims (6)
1. a kind of integration can cascade optical fiber receive tuner module, which is characterized in that including shell, power supply, gain amplifier
Adjustable photoreceiver and tuner；
The photoreceiver, tuner and power supply are packaged in the shell；
In the enclosure, the output terminal of photoreceiver and the input terminal of tuner connect, power supply be used for photoreceiver with
Tuner is powered；
The input terminal of photoreceiver and the output terminal of tuner are drawn from the shell；
The output terminal of tuner includes cascade signal exit and intermediate-freuqncy signal output terminal；
The receiver includes intelligent acess end, photoelectric switching circuit, impedance matching circuit, preamplifier, denoising filter
And adaptive signal enhancement circuit；
Optic fibre input end is the input terminal of photoreceiver；The intelligent acess end, photoelectric switching circuit, impedance matching circuit sequence
Connection, the first signal output end of impedance matching circuit and the input terminal of preamplifier connect, the output terminal of preamplifier
It is connect with the input terminal of denoising filter；
Adaptive signal enhancement circuit is used to receive the signal of denoising filter output, and is exported according to impedance matching circuit second
The signal strength of output is held to the signal that denoising filter exports export after adaptively enhancing；
The output terminal of adaptive signal enhancement circuit is the output terminal of photoreceiver；
The tuner include 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 terminal of tuner；The signal output end of automatic gain amplifier 1 with
The signal input part connection of power splitter, the first signal output end of power splitter and the first signal input part of frequency converter connect, work(
The second signal output terminal of device is divided to be connect with cascade signal exit, the signal output end of local frequency generating circuit and the change
The second signal input terminal connection of frequency device；
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output terminal are linked in sequence.
2. a kind of integration according to claim 1 can cascade optical fiber receive tuner module, which is characterized in that it is described
Adaptive signal enhancement circuit includes comparator, two-stage amplifier and either-or switch；
On the one hand the signal output end of denoising filter connect with the first signal input part of either-or switch, another aspect also with
The signal input part connection of two-stage amplifier, the signal output end of two-stage amplifier and the second signal input terminal of either-or switch
Connection, the signal output end of either-or switch are connect with the signal input part of automatic gain amplifier 1；
The second signal output terminal of impedance matching circuit is also connect with the first input end of comparator, the second input terminal of comparator
Reference data electric signal is connected, the output terminal of comparator and the control terminal of either-or switch connect.
3. a kind of integration according to claim 1 can cascade optical fiber receive tuner module, which is characterized in that it is described
Local frequency generating circuit includes controller, phaselocked loop and local oscillator；The controller with phaselocked loop there is signal to connect；
Phaselocked loop with local oscillator there is signal to connect；The signal output end of local oscillator and the second signal input terminal of frequency converter
Connection.
4. a kind of integration can cascade optical fiber receive tuner module, which is characterized in that including power supply, intelligent acess end, light
Power conversion circuit, impedance matching circuit, preamplifier, denoising filter, adaptive signal enhancement circuit, automatic gain amplification
Device 1, power splitter, frequency converter, local frequency generating circuit, intermediate-frequency filter, automatic gain amplifier 2, intermediate-freuqncy signal output terminal
And cascade signal exit；
Power supply is used to receive each consuming parts power supply in tuner modular circuit to optical fiber；
The intelligent acess end, photoelectric switching circuit, impedance matching circuit are linked in sequence, and the first signal of impedance matching circuit is defeated
The input terminal of outlet and preamplifier connects, and the output terminal of preamplifier and the input terminal of denoising filter connect；
Adaptive signal enhancement circuit is used to receive the signal of denoising filter output, according to impedance matching circuit second output terminal
The signal strength of output carries out the signal that denoising filter exports to be output to automatic gain amplifier 1 after adaptively enhancing；
The signal output end of automatic gain amplifier 1 and the signal input part of power splitter connect, the first signal output of power splitter
End is connect with the first signal input part of frequency converter, and the second signal output terminal of power splitter is connect with cascade signal exit, this
The signal output end of ground frequency generating circuit is connect with the second signal input terminal of the frequency converter；
Frequency converter, intermediate-frequency filter, automatic gain amplifier 2 and intermediate-freuqncy signal output terminal are linked in sequence.
5. a kind of integration according to claim 4 can cascade optical fiber receive tuner module, which is characterized in that it is described
Adaptive signal enhancement circuit includes comparator, two-stage amplifier and either-or switch；
On the one hand the signal output end of denoising filter connect with the first signal input part of either-or switch, another aspect also with
The signal input part connection of two-stage amplifier, the signal output end of two-stage amplifier and the second signal input terminal of either-or switch
Connection, the signal output end of either-or switch are connect with the signal input part of automatic gain amplifier 1；
The second signal output terminal of impedance matching circuit is also connect with the first input end of comparator, the second input terminal of comparator
Reference data electric signal is connected, the output terminal of comparator and the control terminal of either-or switch connect.
6. a kind of integration according to claim 4 can cascade optical fiber receive tuner module, which is characterized in that it is described
Local frequency generating circuit includes controller, phaselocked loop and local oscillator；The controller with phaselocked loop there is signal to connect；
Phaselocked loop with local oscillator there is signal to connect；The signal output end of local oscillator and the second signal input terminal of frequency converter
Connection.
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| CN2810069Y (en) * | 2005-07-25 | 2006-08-23 | 武汉电信器件有限公司 | An optical receiving module for television signals |
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| CN204442596U (en) * | 2015-03-09 | 2015-07-01 | 潮州市潮星科技有限公司 | A kind of radio and television Set Top Box of built-in miniaturized optical receiver |
| CN205408057U (en) * | 2016-02-29 | 2016-07-27 | 四川九洲智能装备有限公司 | Tuner module can be received by cascaded optic fibre to integration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2810069Y (en) * | 2005-07-25 | 2006-08-23 | 武汉电信器件有限公司 | An optical receiving module for television signals |
| WO2012072626A1 (en) * | 2010-11-29 | 2012-06-07 | Telefonica, S.A. | System for signals indoor distribution on optical fiber |
| CN103607548A (en) * | 2013-11-13 | 2014-02-26 | 四川福润得数码科技有限责任公司 | AV modulation output-tuning receiving integrated module group |
| CN203761398U (en) * | 2013-12-27 | 2014-08-06 | 广东省广播电视网络股份有限公司 | FTTH (Fiber To The Home) extension equipment suitable for point-to-point axial access |
| CN204442596U (en) * | 2015-03-09 | 2015-07-01 | 潮州市潮星科技有限公司 | A kind of radio and television Set Top Box of built-in miniaturized optical receiver |
| CN205408057U (en) * | 2016-02-29 | 2016-07-27 | 四川九洲智能装备有限公司 | Tuner module can be received by cascaded optic fibre to integration |
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| CN105578158A (en) | 2016-05-11 |
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