CN205945983U - Duplexing harmonious module is kept apart in integration - Google Patents

Abstract

The utility model discloses a duplexing harmonious module is kept apart in integration relates to the digital television broadcasting technology field, and the technical scheme that utility model adopted is such: including metallic shield cover and a printed circuit board, printed circuit board welded fastening is in the metallic shield cover, the last integration of printed circuit has isolator circuit, diplexer circuit and tuner circuit, and isolator circuit, diplexer circuit connect with regard to the tuner circuit order, isolator circuit's input, diplexer circuit's network signal output part and tuner circuit's control end, output all cover from metallic shield draws forth.

Description

A kind of integration isolation duplex tuning module

Technical field

This utility model is related to digital TV Broadcasting Techniques field, particularly a kind of integration isolation duplex tuning module.

Background technology

In cable of cable TV transmitting procedure, may be because of wire electric leakage, loose contact, or lightning induction, high-tension electricity Source is incorporated in user family, causes receiving device to receive interference, damage even personal injury, in order to solve problems, needs In set-top box signal input external installation antenna isolator.Simultaneously for the numeral electricity using EOC or DOCSIS technical standard Depending on bi-directional set-top box, inside Set Top Box, need built-in use duplexer module and tuner module.Digital television bidirectional Set Top Box Using the connection of antenna isolator module, duplexer module and tuner module with realize principle such as Fig. 1.

Referring to Fig. 2, antenna isolator internal high-voltage isolation capacitance, to input with output ground, input signal heart yearn with defeated Go out to carry out high_voltage isolation and signal coupling between heart yearn, be in high impedance to direct current and low frequency signal, can eliminate because of input entoilage line, letter Number reception that between line and receiving device ground wire, holding wire, potential difference causes interference, it is to avoid receiving device spontaneous combustion, the danger such as on fire, Protection user's property and life security.

Antenna isolator, between input ground 1 and output ground 1, has two groups of ground connection high pressure and input ground 2 and output ground 2 between Isolation capacitance, each group of ground connection high_voltage isolation electric capacity may be formed by 1 to 5.Require for different isolation voltage, high pressure every It is divided into 500V, 1000V, 2000V or higher from electric capacity.

During the integration of three networks, for being difficult to carry out the old cell of fiber reforming, for realizing the function of online, broadcasting and TV Operator, on the basis of original CHINA RFTCOM Co Ltd, using frequency multiplexing technique, network signal and television broadcasting signal is loaded on not Same frequency, is mounted on original cable network, by cable tv coax, is transferred to customer households, realizes in family Net function.

It is radio and television users family in user side, input signal needs to first pass through a cable television duplexer, by network Signal and broadcast television signal are separated into two class outputs, and network signal enters NE and is changed into TCP/IP letter after treatment Number, the network equipment such as couple in router, switch, connects computer or mobile terminal realizes online；Broadcast television signal is accessed Set top box main, be tuned receive, demodulation, decoding be converted to standard television signal.

For meeting different application requirements, usually adopted by the technology that cable tv coax realizes family online Two kinds of standards of EOC and DOCSIS.EOC is the abbreviation of Ethernet Over Coxial, be one kind adopt coaxial cable transmit with The technical standard of too net, is issued and is used widely at home by domestic；DOCSIS also known as cable data System-Interface-Specification, It is another kind of technology by cable of cable TV high-speed transferring data, proposed by Cable Labs, by International Telecommunication Union ITU Adopt and be worldwide used widely.Two kinds of technology all employ frequency division multiplexing, are required for double using cable television Work device, meets the referred to as EOC duplexer of EOC standard, meets the referred to as DOCSIS duplexer of DOCSIS standard, two kinds of duplexers are only It is the difference of the wave filter that frequency partition is brought, ultimate principle has no difference.This patent is referred to as duplexer.

As Fig. 3, be that television carrier and the separation of network signal are realized by wave filter inside duplexer, duplexer defeated Enter signal and be divided into two-way through signal distributor, a road enters TV signal wave filter, another road enters network signal wave filter. It should be noted that when side circuit is realized, because the frequency shared by television carrier or network signal might not be continuous, two Frequency between person exists intersects, so the output of duplexer might not only have two-way, such as network signal may have 1 ~ 2 branch road Or may be more, so the two-way output signal Zhong Mei road of Fig. 3 description may comprise multiple tributary signals.

In simulation and digital television signal transmitting procedure, for improving transmission quality and efficiency of transmission, the quilt of different programs Transmission signal needs to be modulated on different channel with certain modulation system, carries out broadcast type biography in a wired or wireless manner Defeated, in user terminal receiver, then the carrier channel corresponding to the program that will need to receive, through amplification, frequency conversion, frequency-selecting filter Ripple, filters other channel carrier frequency, and corresponding channel carrier signal is transformed to the frequency specified, and to this assigned frequency（It is probably Intermediate frequency, Low Medium Frequency or zero intermediate frequency）It is demodulated, to be reduced into the signal modulated, the such as TS stream of digital television program or simulation PAL, NTSC or SECAM signal of TV.In the process, amplification, frequency conversion, frequency-selective filtering function are integrated in a radio frequency mould Realize in group, this radio frequency module is commonly referred to as high-frequency electronic tuner.

It can be seen that, the product above three module not merged in prior art, people need to buy above-mentioned three respectively Plant module, connect together.With continued reference to Fig. 1, isolator is installed on outside digital bidirectional set up box, be one independent Module, cable of cable TV of registering one's residence is plugged in the rf inputs of isolator module, by internal ground connection high_voltage isolation electric capacity, Signal high_voltage isolation electric capacity realize to the input of isolator and output ground between, between radio-frequency input signals and output signal High_voltage isolation, from the signal through high_voltage isolation of the coaxial output line output of isolator module, by coaxial cable or coaxial Adapter, accesses the television signal input end of digital television bidirectional Set Top Box, realizes register one's residence cable of cable TV and numeral High_voltage isolation on holding wire and ground wire for the TV bi-directional set-top box and signal coupling.

Duplexer module and tuner module are all built in digital television bidirectional Set Top Box, from the signal of isolator output Access duplexer module through radio frequency input coaxial connector, through signal distribution and traffic filter, be separated into television carrier With network signal and from the output of duplexer module.

The network signal of duplexer module output, inputs to the built-in network communication processing unit of Set Top Box, realizes TCP/ The unpacking of IP, error correction and Communication processing, are exported from Set Top Box with RJ45 joint, connect by external router, switch or directly Enter computer terminal, complete family online.

The TV carrier signal of duplexer module output, through joint and coaxial cable switching, inputs to tuner module, warp After filtering, amplification, frequency conversion reception, intermediate frequency amplify, from the output of tuner module, input to the solution on follow-up set-top box circuitry plate Tune, decoding circuit, are converted to standard television signal and export from Set Top Box, access television set and are watched.

There is certain defect in existing way, for example：

1）Isolator, duplexer, three independent modules of tuner and at least one coaxial cable is needed to carry out between module Connection；

2）Three individual module need to be required for single metallic shield, coaxial connector, circuit board, wherein isolator Module due to be in Set Top Box outside in addition it is also necessary to a set of plastic housing realizes personal contact's safety, three modules each individually produce, Debugging, inspection, packaging, material cost, production cost are higher；

3）Need a coaxial transit cable and corresponding cooperation joint to connect duplexer and two modules of tuner, enter one Step increased material cost and production cost；

4）Isolator module is coaxially connected between duplexer module, and between duplexer module and tuner module Coaxial transit cable and accordingly coordinate joint, increased the signal Insertion Loss of TV carrier signal, reduce signal receive sensitive Degree；

5）Isolator module, duplexer module and the tuner module independently producing, after connecting cooperation, because each The systematic error producing, checking, easily produces cooperation index bad, thus affecting whole system performance；

6）The production of three module independences, checkout procedure, and follow-up increased coaxial transit cable, joint, produced Journey is complicated, and the quality of production is difficult to be effectively controlled.

Utility model content

Goal of the invention of the present utility model is：For above-mentioned problem, provide a kind of isolation duplex of integration Tuning module.

The technical solution adopted in the utility model is such：Including metallic shield and a printed circuit board, described Printed circuit board is fixedly welded in metallic shield；

Isolator circuit, duplexer circuit and tuner circuit, isolator circuit, duplex are integrated with described printed circuit Device circuit is linked in sequence with regard to tuner circuit；

The control end of the input of isolator circuit, the network signal outfan of duplexer circuit and tuner circuit, defeated Go out end to draw all from metallic shield.

Further, the input of isolator circuit is isolated form coaxial fitting；Isolated form coaxial fitting include input ground and Center signal line；

Between the input ground of isolated form coaxial fitting and metallic shield, electrical isolation is realized with dielectric, wear to input Cross metallic shield to be directly welded on printed circuit board, and by being grounded the ground wire on high_voltage isolation electric capacity and printed circuit board It is connected, the ground wire of printed circuit board is electrically connected with metallic shield；Described center signal line is welded on through metallic shield On printed circuit board, and it is connected with the input of duplexer circuit by signal high_voltage isolation electric capacity.

Further, described duplexer circuit is used for the Signal separator of input is TV carrier signal and network signal；Double The TV carrier signal outfan of work device circuit is connected with the input of tuner circuit.

Further, described tuner circuit be used for input signal carry out controllable gain amplification, frequency conversion, intermediate frequency filtering and Intermediate frequency controllable gain amplifies, and exports intermediate-freuqncy signal；

Described tuner circuit includes controller and the denoising filter being linked in sequence, controllable gain amplifier, variable-frequency electric Road, intermediate frequency digital wave filter and intermediate frequency controllable gain amplifier；Controllable gain amplifier, frequency changer circuit, intermediate frequency digital wave filter All with controller, there is signal to be connected；The control end of tuner circuit is the control end on controller.

Further, described duplexer circuit includes signal distributor, TV signal wave filter and network signal wave filter；Institute The signal input part stating signal distributor is the input of duplexer；One outfan of signal distributor is filtered with TV signal The input of device connects, and another outfan is connected with the input of network signal wave filter；The output of TV signal wave filter Hold the TV carrier signal outfan for duplexer circuit；The outfan of network signal wave filter is the network letter of duplexer circuit Number outfan.

Further, described frequency changer circuit includes crystal oscillator, converter, local oscillator and phaselocked loop；Crystal oscillation Device is connected with controller, and controller is used for working in assigned frequency by phase lock control local oscillator, and local oscillator produces The local oscillated signal of raw assigned frequency is simultaneously transferred to converter, and converter also receives the signal of controllable gain amplifier output, The outfan of converter is connected with the input of intermediate frequency digital wave filter.

Further, described TV signal wave filter is that multistage LC filter stage joint group becomes.

Further, described network signal wave filter has 1 tunnel ~ 3 road filter branch, and each branch road is multistage LC filter stage Joint group becomes.

Further, described ground connection high_voltage isolation electric capacity has two groups, and every group of ground connection high_voltage isolation electric capacity is by 1 ~ 5 capacitance group Become.

Due to employing technique scheme, the beneficial effects of the utility model are：

1）Only need to one group of metallic shield, one piece of PCBA circuit board, a production process, greatly reduce material cost With production, packing cost；

2）Built-in isolator, can lift safety in utilization and the capacity of resisting disturbance of Set Top Box；

3）Do not need coaxially connected between isolator and duplexer, and the co-axial connecting cable between duplexer and tuner With corresponding joint, reduce the material cost of bi-directional set-top box, decrease the loss of signal of transmitting procedure, improve receipt signal Sensitivity；

4）Greatly reduce small product size；

5）Prevent independent module design, production, connected brought systematic error, improve product quality.

Brief description

Fig. 1 is existing isolator, the connection diagram of duplexing module and tuning module.

Fig. 2 is existing isolator internal structure schematic diagram.

Fig. 3 is existing duplexer internal structure schematic diagram.

Fig. 4 is this utility model structural representation.

Specific embodiment

Below in conjunction with the accompanying drawings, this utility model is described in detail.

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only in order to explain This utility model, is not used to limit this utility model.

This utility model passes through circuit optimization, devises a kind of integration isolation duplex tuning module, this integrated module It is integrated in a metallic shield, built-in isolator, duplexer and tuner circuit, this utility model module is installed on numeral Inside TV bi-directional set-top box, it is directly welded on Set Top Box internal circuit board, its input can be directly connected to cable television and enter Family cable.

As shown in figure 4, this utility model includes metallic shield and a printed circuit board, such as pcb board or PCBA board, institute State printed circuit board to be fixedly welded in metallic shield；Isolator circuit, duplexer circuit are integrated with described printed circuit And tuner circuit, isolator circuit, duplexer circuit are linked in sequence with regard to tuner circuit；The input of isolator circuit, double The control of the network signal outfan of work device circuit and tuner circuit, outfan are drawn all from metallic shield.

In one embodiment, the input of isolator circuit is isolated form coaxial fitting；Isolated form coaxial fitting includes Input ground and center signal line.

Between the input ground of isolated form coaxial fitting and metallic shield, electrical isolation is realized with dielectric, wear to input Cross metallic shield to be directly welded on printed circuit board, and by being grounded the ground wire on high_voltage isolation electric capacity and printed circuit board It is connected, the ground wire of printed circuit board is electrically connected with metallic shield；Described center signal line is welded on through metallic shield On printed circuit board, and it is connected with the input of duplexer circuit by signal high_voltage isolation electric capacity.

In another embodiment, isolated form coaxial fitting has two groups of input ground, and every group of input ground is high by one group of ground connection Pressure isolation capacitance is connected with the ground wire on printed circuit board, and every group of ground connection high_voltage isolation electric capacity includes 1 ~ 5 electric capacity.

Described duplexer circuit includes signal distributor, TV signal wave filter and network signal wave filter；Described signal The signal input part of allotter is the input of duplexer；One outfan of signal distributor is defeated with TV signal wave filter Enter end to connect, another outfan is connected with the input of network signal wave filter；The outfan of TV signal wave filter is double The TV carrier signal outfan of work device circuit；The outfan of network signal wave filter is the network signal output of duplexer circuit End.

In one embodiment, described TV signal wave filter is that multistage LC filter stage joint group becomes, described network signal Wave filter has 1 tunnel ~ 3 road filter branch, and each branch road is that multistage LC filter stage joint group becomes.

Described tuner circuit can for carrying out controllable gain amplification, frequency conversion, intermediate frequency filtering and intermediate frequency to the signal inputting Control gain is amplified, and exports.

In one embodiment, described tuner circuit includes controller and the denoising filter being linked in sequence, controlled increasing Beneficial amplifier, frequency changer circuit, intermediate frequency digital wave filter and intermediate frequency controllable gain amplifier；Controllable gain amplifier, frequency changer circuit, Intermediate frequency digital wave filter all has signal with controller and is connected.Controller has control end, and a concrete form of control end is Probe-type interface, this interface is the control end of tuner circuit, and available I C bus is communicated with extraneous control device.

Described frequency changer circuit is conventional circuit in tuner, and one embodiment includes crystal oscillator, converter, basis Ground agitator and phaselocked loop；Crystal oscillator is connected with controller, and controller is used for by phase lock control local oscillator work Make in assigned frequency, local oscillator produces the local oscillated signal of assigned frequency and is transferred to converter, and converter also receives The signal of controllable gain amplifier output, the signal of controllable gain amplifier output and local oscillated signal that converter receives Difference frequency simultaneously exports, and the outfan of converter is connected with the input of intermediate frequency digital wave filter.

During use, the isolated form coaxial input adapter of this utility model module is connected with cable television drop cable, through connecing The high_voltage isolation that ground high_voltage isolation electric capacity and signal high_voltage isolation electric capacity complete to register one's residence coaxial cable input signal and ground wire is high Signal transmission after pressure isolation, to signal distribution circuit and TV signal wave filter, network signal wave filter, is separated into TV Carrier signal and network signal, network signal directly exports from module, subsequently inputs to the built-in network communication of Set Top Box and processes Unit, realizes unpacking, error correction and the Communication processing of TCP/IP, is exported from Set Top Box with RJ45 joint, by external router, friendship Change planes or be directly accessed computer terminal, complete family online.

The PCB trace through module internal for the TV carrier signal, inputs to follow-up denoising filter, completes FM/WIFI etc. and does Disturb filtering of signal, from the signal of denoising filter output, after amplified, frequency-conversion processing, intermediate frequency filtering, intermediate frequency amplify, from mould Group output intermediate-freuqncy signal, inputs to demodulation on follow-up Set Top Box internal circuit board, decoding circuit, is converted to standard television letter Number from Set Top Box output, access television set watched.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this Any modification, equivalent and improvement made within the spirit of utility model and principle etc., should be included in this utility model Protection domain within.

Claims (9)

1. a kind of integration isolation duplex tuning module is it is characterised in that include metallic shield and a printed circuit board, institute State printed circuit board to be fixedly welded in metallic shield；

Isolator circuit, duplexer circuit and tuner circuit, isolator circuit, duplexer electricity are integrated with described printed circuit Road is linked in sequence with tuner circuit；

The control end of the input of isolator circuit, the network signal outfan of duplexer circuit and tuner circuit, outfan Draw all from metallic shield.

2. according to claim 1 a kind of integration isolation duplex tuning module it is characterised in that isolator circuit defeated Entering end is isolated form coaxial fitting；Isolated form coaxial fitting includes input ground and center signal line；

Between the input ground of isolated form coaxial fitting and metallic shield, electrical isolation is realized with dielectric, input ground passes through gold Belong to radome to be directly welded on printed circuit board, and by being grounded the ground wire phase on high_voltage isolation electric capacity and printed circuit board Even, the ground wire of printed circuit board and metallic shield are electrically connected；Described center signal line is welded on print through metallic shield On circuit board processed, and it is connected with the input of duplexer circuit by signal high_voltage isolation electric capacity.

3. a kind of integration isolation duplex tuning module according to claim 1 is it is characterised in that described duplexer circuit For the Signal separator of input is TV carrier signal and network signal；The TV carrier signal outfan of duplexer circuit with The input of tuner circuit connects.

4. a kind of integration isolation duplex tuning module according to claim 1 is it is characterised in that described tuner circuit Amplify for the signal inputting is carried out with controllable gain amplification, frequency conversion, intermediate frequency filtering and intermediate frequency controllable gain, and export；

Described tuner circuit include controller with the denoising filter being linked in sequence, controllable gain amplifier, frequency changer circuit, in Frequency digital filter and intermediate frequency controllable gain amplifier；Controllable gain amplifier, frequency changer circuit, intermediate frequency digital wave filter all with control Utensil processed has signal to connect；The described control end of tuner circuit is the control end on controller.

5. a kind of integration isolation duplex tuning module according to claim 3 is it is characterised in that described duplexer circuit Including signal distributor, TV signal wave filter and network signal wave filter；The signal input part of described signal distributor is double The input of work device；One outfan of signal distributor is connected with the input of TV signal wave filter, another outfan It is connected with the input of network signal wave filter；The outfan of TV signal wave filter is the TV carrier signal of duplexer circuit Outfan；The outfan of network signal wave filter is the network signal outfan of duplexer circuit.

6. a kind of integration isolation duplex tuning module according to claim 4 is it is characterised in that described frequency changer circuit bag Include crystal oscillator, converter, local oscillator and phaselocked loop；Crystal oscillator is connected with controller, and controller is used for passing through Phase lock control local oscillator works in assigned frequency, and local oscillator produces the local oscillated signal of assigned frequency and transmits To converter, converter also receives the signal of controllable gain amplifier output, the outfan of converter and intermediate frequency digital wave filter Input connect.

7. one kind integration isolation duplex tuning module according to claim 5 is it is characterised in that described TV signal is filtered Ripple device is that multistage LC filter stage joint group becomes.

8. one kind integration isolation duplex tuning module according to claim 5 is it is characterised in that described network signal is filtered Ripple utensil has 1 tunnel ~ 3 road filter branch, and each branch road is that multistage LC filter stage joint group becomes.

9. a kind of integration isolation duplex tuning module according to claim 2 it is characterised in that described ground connection high pressure every There are two groups from electric capacity, every group of ground connection high_voltage isolation electric capacity is made up of 1 ~ 5 electric capacity.