CN206640720U - Ground digital television signal reception system based on power line transmission - Google Patents
Ground digital television signal reception system based on power line transmission Download PDFInfo
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Abstract
A kind of ground digital television signal reception system based on power line transmission, including the signal modulation equipment for being coupled to ground digital television signal system on power line and for the signal demodulating apparatus to the transmission signal demodulation on power line network, the input interface of the signal modulation equipment is connected with a digit signal receiver, and output interface is connected with the power line network；The input interface of the signal demodulating apparatus is connected with the power line network, and output interface is connected with an at least audio-visual devices.The ground digital television signal received is modulated into by the utility model by power line signal modulating equipment to be adapted to transmit in power line network, and the signal demodulating apparatus by being connected to power line network is demodulated and decoded to the signal of power line transfers on network can show terrestrial DTV program on audio-visual devices.
Description
Technical field
The utility model belongs to field of broadcast communication, and in particular to a kind of terrestrial DTV letter based on power line transmission
Number reception system.
Background technology
Power network is to be distributed most wide cable network in the world, and extra communication need not be laid by carrying out communication using power line
Circuit, to cut operating costs, reduce the expenditure for building new communication network.Meanwhile power line communication is as following " four net conjunctions
One " key technology, possesses vast potential for future development.It can be accomplished " plug and play " using power line communicationses, access power supply is
It is simple and convenient in the extreme equal to access network.Power line realizes all standing in each room substantially in building.Due to electricity
Line of force communication is (referred to as：Broadband PLC) various advantages, substantial amounts of research has been carried out to this both at home and abroad, its standardization effort is also just
It is underway.But due to being accessed while having a variety of power equipments on power line, disturbed sources of noise is more and big, and communication environment is very
Badly, the dielectric property plus power line in itself, transmission attenuation is big, and available communications band bandwidth is restricted, and it transmits speed
Rate is far less than coaxial cable.
On the other hand, ground digital television signal realizes transmission at a distance and large area by television transmitting tower base station
Covering, but due to being transmitted in a manner of radio magnetic wave, indoor ground digital television signal can significantly decay, one
As guided to exterior aerial to receive, it is necessary to lay longer feeder line on receiving device, except wiring inconvenience, can also cause letter
Number decay, influence reception.Chinese terrestrial digital TV standard is DTMB, has implemented in full construction at present, it is contemplated that
Overwhelming majority area is covered before the year two thousand twenty, and closes all simulated televisions.How so that indoors can with conveniently watching DTMB
Face DTV, which is one, to be needed to solve the problems, such as.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of ground digital television signal based on power line transmission
Reception system, it is intended to which ground digital television signal is transmitted by the power line network of indoor deployments.
Therefore, the utility model provides a kind of ground digital television signal reception system based on power line transmission, bag
Include signal modulation equipment for being coupled to ground digital television signal system on power line network and for power line network
Transmission signal demodulation signal demodulating apparatus,
The input interface of the signal modulation equipment is connected with a digit signal receiver, output interface and the power line
Net connection；
The input interface of the signal demodulating apparatus is connected with the power line network, output interface and an at least audio-visual devices
Connection.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the signal
Modulating equipment includes being used to pre-process ground digital television signal generating the pretreatment module of TS streams, for flowing into the TS
The up-converter circuit of the modulation circuit of row modulation, the radiofrequency signal for the TS streams after the modulation to be upconverted to uhf band
With for amplifying the rf power amplifier circuit of the radiofrequency signal and for the radiofrequency signal to be coupled into the power line
First isolation coupling circuit of net,
The input port of the signal pre-processing module is connected with the digit signal receiver, output port and the tune
Circuit, up-converter circuit, rf power amplifier circuit and the first isolation coupling circuit processed are sequentially connected；
The output port of the first isolation coupling circuit is connected with the power line network.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the pre- place
Reason module include it is multiple be used for lock the power line network transmission signal frequency tuner, for DTMB signals demodulation
First demodulator circuit, flow through for TS the TS stream process circuit of filter and descrambling generation TS transparent flows, for by the TS transparent flows
Multiplex circuit is flowed with the TS of PSI information tables multiplexing process generation TS transport streams, wherein,
The input port of the multiple tuner is connected with the digit signal receiver, output port and the described first solution
Circuit, TS stream process circuit and TS stream multiplex circuits is adjusted to be sequentially connected；
The output port of the TS streams multiplex circuit is connected with the input port of the modulation circuit.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the signal
Demodulated equipment includes：
The the second isolation coupling circuit for obtaining transmission signal for carrying out isolation coupling to the power line network, described second
The input port of isolation coupling circuit is connected with the power line network；
For being filtered to the transmission signal and the signal processing circuit of power amplification, the signal processing circuit
Input port is connected with the output port of the isolation coupling circuit；
For carrying out the lower frequency changer circuit of down-converted, the input port of the lower frequency changer circuit to the transmission signal
It is connected with the output port of the signal processing circuit；
For analog signal to be converted into the analog to digital conversion circuit of data signal, the input port of analog-digital conversion circuit as described
It is connected with the output port of the lower frequency changer circuit；
For to the data signal carry out TDS-OFDM demodulation the second demodulator circuit, second demodulator circuit it is defeated
The output port of inbound port and analog-digital conversion circuit as described connects；
For to the signal after demodulation decode the main process task circuit of simultaneously output display signal, the main process task circuit
Input interface is connected with the output port of second demodulator circuit, and output port is connected with the audio-visual devices.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, in addition to one
Remote control, the signal demodulating apparatus also include wireless communication line corresponding with the remote control, the wireless communication line
It is connected with the main process task circuit.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the remote control
Device is by infrared communication, Bluetooth communication, 2.4G is wireless and the demodulation of the one or more and signal of ZigBee communication mode is set
Standby connection.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the numeral
Signal receiver includes a terrestrial DTV antenna, and the power line signal modulating equipment passes through coaxial cable and the ground
Digital TV antenna connects.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the TS streams
Multiplex circuit includes a fpga chip, and the fpga chip connects the TS stream process circuit and modulation circuit.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, described first
Demodulator circuit includes DTMB chips, and the DTMB chips connect with one or more of tuners and TS stream process circuit respectively
Connect.
According to the ground digital television signal reception system provided by the utility model based on power line transmission, the modulation
Circuit includes a TDS-OFDM modulation chips, and the TDS-OFDM modulation chips flow multiplex circuit and up-converter circuit with TS respectively
Connection.
Compared to prior art, a kind of ground digital television signal based on power line transmission provided by the utility model connects
The ground digital television signal received is modulated into by receipts system by power line signal modulating equipment to be adapted in power line network
The signal of transmission, and the signal after modulation is coupled to power line transfers on network, by the signal solution for being connected to power line network
Terrestrial DTV can be showed on audio-visual devices by adjusting equipment to be demodulated and decode the signal of power line transfers on network
Program, realize the transmission and covering of ground digital television signal indoors using power line network, it is not necessary to extra laying TV letter
Number network.
Brief description of the drawings
Fig. 1 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Structural representation；
Fig. 2 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Signal modulation equipment structural representation；
Fig. 3 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Signal demodulating apparatus structural representation；
Fig. 4 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Workflow diagram；
Main element symbol description:
Following embodiment will further illustrate the utility model with reference to above-mentioned accompanying drawing.
Embodiment
In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool
The utility model is described in detail body embodiment.It should be noted that in the case where not conflicting, the implementation of the application
Feature in mode and embodiment can be mutually combined.Elaborate many details in order to abundant in the following description
Understand the utility model, described embodiment is only a part of embodiment of the utility model, rather than whole realities
Apply mode.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belong to the scope of the utility model protection.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.
Fig. 1 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Structural representation, as shown in figure 1, the ground digital television signal reception system include be used for ground digital television signal
System is coupled to the signal modulation equipment 100 on power line network 500 and the letter for being demodulated to the transmission signal on power line network 500
Number demodulated equipment 200, the input interface of the signal modulation equipment 100 are connected with a digit signal receiver 400, output interface
It is connected with the power line network 500.The digit signal receiver 400 includes a terrestrial DTV antenna, the power line
Signal modulation equipment 100 is connected by coaxial cable with the terrestrial DTV antenna.The signal demodulating apparatus 200 it is defeated
Incoming interface is connected with the power line network 500, and output interface is connected with an at least audio-visual devices 300.
Ground digital television signal (Digital Television Terrestrial Multimedia
Broadcasting, DTMB) transmitted from digit signal receiver 400 installed outdoors to 100 turns of signal modulation equipment
After change is processed into the low-rate signal for below the 30Mbps for being adapted to be transmitted in power line network 500, power line network is coupled in modulation
500 are transmitted.Indoor signal demodulating apparatus 200 is coupled to receive the transmission letter on power line network 500 from power line network 500
Number, audio-visual vision signal is exported by signal transacting, the backward audio-visual devices 300 of demodulation and decoding, is presented on audio-visual devices 300
The program of ground digital television signal, realize that the power line network 500 formed indoors using power line realizes ground digital electricity
Depending on the full in-door covering of signal.
Fig. 2 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Power line signal modulating equipment 100 structural representation, as shown in Fig. 2 the signal modulation equipment 100 include pretreatment mould
Block 110, modulation circuit 120, up-converter circuit 130, the isolation coupling circuit 150 of rf power amplifier circuit 140 and first.Its
In, the input port of the signal pre-processing module 110 is connected with the digit signal receiver 400, output port with it is described
Modulation circuit 120, up-converter circuit 130, the isolation coupling circuit 150 of rf power amplifier circuit 140 and first are sequentially connected；Institute
The output port for stating the first isolation coupling circuit 150 is connected with the power line network 500.
In present embodiment, pretreatment module 110 is used to pre-process ground digital television signal generation TS streams.It is described pre-
Processing module 110 includes multiple tuners 111, the first demodulator circuit 112, TS stream process circuit 113, TS stream multiplex circuits 114.
The input port of the multiple tuner 111 is connected with the digit signal receiver 400, output port and the described first demodulation
Circuit 112, TS stream process circuit 113 and TS stream multiplex circuits 114 are sequentially connected.The output end of the TS streams multiplex circuit 114
Mouth is connected with the input port of the modulation circuit 120.
In the pretreatment module 110 of present embodiment, tuner 111 is used for the transmission for locking the power line network 500
The frequency of signal.
First demodulator circuit 112 demodulates for DTMB signals.First demodulator circuit 112 includes DTMB chips, described
DTMB chips are connected with one or more of tuners 111 and TS stream multiplex circuits 114 respectively.
TS stream process circuit 113 is used to flow through the TS after demodulation filter and descrambling generation TS transparent flows.Wherein, the TS streams
Process circuit 113 includes field programmable gate array (FPGA) chip of a customization, fpga chip connection first solution
Adjust circuit 112 and TS stream multiplex circuits 114.In present embodiment, the fpga chip possesses ISO7816 intelligent card interfaces, and interior
Operating system is put, the communication with condition receiving system (CAS) and descrambling can be achieved, while single card can be achieved to multiplexed program
Descrambling.Processor 170 receives telecommand, controls the fpga chip, and the program PID selected by user is filtered and descrambled
Transparent flow, while Program Specific Information (Program Special Information, PSI) information table of necessary program
(including Program Association Table (Program Association Table, PAT), Program Map Table (Program Map Table,
PMT), network information table (Network Information Table, NIT), conditional access table (Condition Access
Table, CAT) etc.) also together it is sent into the transport stream that TS stream multiplexing process chips are multiplexed.
TS stream multiplex circuits 114 are used for the TS transparent flows and PSI information tables multiplexing process generation TS streams.
Modulation circuit 120 is used to be modulated the TS streams of multiplexing process generation.In present embodiment, the modulation
Circuit 120 includes a TDS-OFDM modulation chips, and the TDS-OFDM modulation chips flow multiplex circuit 114 and upper change with TS respectively
Frequency circuit 130 connects.
Up-converter circuit 130 is used for the radiofrequency signal that the TS streams after the modulation are upconverted to uhf band；Radio-frequency power
Amplifying circuit 140 is used to amplify the radiofrequency signal.
First isolation coupling circuit 150 is used to the radiofrequency signal being coupled to the power line network 500.
Fig. 3 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Signal demodulating apparatus 200 structural representation, as shown in figure 3, the signal demodulating apparatus 200 include be sequentially connected second
Isolation coupling circuit 210, signal processing circuit 220, lower frequency changer circuit 230, analog to digital conversion circuit 240, the second demodulator circuit 250
With main process task circuit 260, wherein, the input port of the second isolation coupling circuit 210 is connected with the power line network 500,
The output port of the main process task circuit 260 is connected with the audio-visual devices 300.
Second isolation coupling circuit 210 is used to carry out the power line network 500 isolation coupling acquisition transmission signal；
Signal processing circuit 220 is used to be filtered the transmission signal and power amplification；
Lower frequency changer circuit 230 is used to carry out down-converted to the transmission signal；
Analog to digital conversion circuit 240 is used to analog signal being converted into data signal, the input of analog-digital conversion circuit as described 240
Port is connected with the output port of the lower frequency changer circuit 230；
Second demodulator circuit 250 is used to carry out TDS-OFDM demodulation, second demodulator circuit 250 to the data signal
Input port be connected with the output port of analog-digital conversion circuit as described 240.
Main process task circuit 260 is used to the signal after demodulation decode and output display signal, the main process task circuit
260 input interface is connected with the output port of second demodulator circuit 250.
In the above-described embodiment, the ground digital television signal reception system can also include a remote control, described
Signal demodulating apparatus 200 also includes wireless communication line 270 corresponding with the remote control, and the signal modulation equipment 100 has
There is communication module 180 corresponding with the remote control, the wireless communication line 270 is connected with the main process task circuit 260, described
Communication module 180 is connected with processor 170.The remote control is by infrared communication, Bluetooth communication, 2.4G is wireless and ZigBee leads to
The one or more of letter mode are connected with the signal demodulating apparatus 200 and signal modulation equipment 100.Remote control and wireless telecommunications
Circuit 270 be operated in low rate, low-order-modulated, high-penetration wireless frequency wireless mode under, pass through wireless communication line 270
Control signal demodulated equipment 200, the communication module 180 of signal modulation equipment 100 wirelessly with signal demodulating apparatus
200 signal wireless communication line 270 connects, and realizes the mutual transmission of control command.Remote control and signal demodulating apparatus 200 are
Correspondingly, when multiple signal demodulating apparatus 200 and remote control be present, the remote control only controls corresponding signal solution
Adjust equipment 200 and shared signal modulation equipment 100.
When user watches TV programme, signal demodulating apparatus 200 provides Man Machine Interface, and remote control can be with control signal
Demodulated equipment 200 carries out program searching, program switching, and relevant control instruction is sent to signal by synchronous signal demodulated equipment 200
Modulating equipment 100, synchronous frequency handover, demodulation, decoding and the TS of carrying out of control signal modulating equipment 100 flow through filter etc. science and engineering
Make.Signal modulation equipment 100 and signal demodulating apparatus 200 synchronously complete under the communication protocol of control and the setting of remote control
Respective work.
Fig. 4 is the ground digital television signal reception system based on power line transmission described in the embodiment of the utility model one
Workflow diagram.As shown in figure 4, the workflow of ground digital television signal reception system includes step S401~S405.
Wherein, step S401~S403 is completed by signal modulation equipment 100, and step S404 and S405 is completed by signal demodulating apparatus 200.
Step S401：To terrestrial television Signal Pretreatment, TS transport streams are exported.
During work, the digital television signal that digit signal receiver 400 receives is admitted to one or more tuners 111,
Processor 170 controls tuner 111 to lock corresponding frequency, and the intermediate-freuqncy signal after down coversion is sent into the first demodulator circuit
In 112 DTMB chips.The program PID that DTMB chips are selected by user, which is filtered and descrambled, transparent flow, while necessary
Program PSI information tables (including PAT, PMT, NIT, CAT etc.) also together be sent into TS stream multiplex circuit 114 TS stream multiplexing at
Reason chip handles the TS transport streams being multiplexed.
Step S402：CDMA (TDS-OFDM) modulation chip of the Domain Synchronous of modulation circuit 120, according to multiplexed code
The bandwidth selection suitable parameters of stream are modulated, to reach preferably laser propagation effect.Under the premise of bandwidth is met, parameter selection with
It is criterion to tackle more complicated electric power environmental and transmission range.TDS-OFDM modulation chips are directly exported in zero after I/Q is synthesized
Frequency signal, the radiofrequency signal of some frequency of uhf band, frequency bandwidth 8M are upconverted to by up-converter circuit 130.
Step S403：Power amplification processing and power line signal coupling processing.In order to ensure transmission range farther out, radio frequency
Power amplification circuit 140 radiofrequency signal is amplified after again by the coupling coil of the first isolation coupling circuit 150 by radiofrequency signal
It is coupled on power line network 500 and is transmitted.
Step S404：From the reception signal of power line network 500 and down coversion and demodulation process are carried out, exports TS transport streams.
In present embodiment, the coupling of signal modulation equipment 100 can be received by being distributed on the power line network 500 in each room
The transmission signal in power line network 500 is closed, the second isolation coupling circuit 210 of signal demodulating apparatus 200 is to the coupling of power line network 500
Close the radiofrequency signal obtained after isolation to be first filtered according to its center frequency point and bandwidth by signal processing circuit 220, filter out
Signal is amplified by low-noise amplifier after interference signal outside bandwidth.Then by lower frequency changer circuit 230 by down coversion at
Reason obtains intermediate-freuqncy signal, and intermediate-freuqncy signal is sent into analog to digital conversion circuit 240 and is transformed into data signal, passes through the second demodulator circuit 250
TDS-OFDM chips demodulate to obtain the whole TS transport streams transmitted on power line network 500.
Step S405：TS flows signal transacting, exports audio-video signal.
TS transport streams are sent into be handled with decoding function, the main process task circuit 260 of display output interface.Main process task electricity
Road 260 can receive the instruction of remote control by wireless communication line 270, and the TS transmission transmitted is parsed in program searching
PSI information in stream, obtains programme information.When playing, program is selected according to user, selects to be transmitted across to audio-visual devices 300
Corresponding audio frequency and video in the TS transport streams come.
A kind of power line for ground digital television signal reception system based on power line transmission that present embodiment provides
After signal modulation equipment 100 receives ground digital television signal, signal modulation equipment 100 first passes through 110 biographies of pretreatment module
The programme information of defeated user's selection, so as to which communication bandwidth is greatly reduced, turning into its transmission on power line network 500 can
Can, while in pretreatment, support to descramble while locking and Polymera while multiple frequencies, it is only necessary to a descrambling
Card, so that it may so that multiple users can be inserted in special receiving device on electric power line socket in each room while watch different sections
Mesh.
It is adapted to further, since the ground digital television signal received is modulated into by signal modulation equipment 100 in power line
The signal transmitted in net 500, and the signal after modulation is coupled on power line network 500 and transmitted, by being connected to power line
The signal demodulating apparatus 200 of net 500 is demodulated and decoded to the signal transmitted on power line network 500 can be in audio-visual devices
Terrestrial DTV program is showed on 300, using power line network 500 realize indoors ground digital television signal transmission and
Covering, it is not necessary to additionally lay television signals network, provide the user more preferably cost performance service, there is wide market to apply
Prospect.
In several embodiments provided by the utility model, it should be understood that disclosed system and method,
It can realize by another way.For example, system embodiment described above is only schematical, for example, described
The division of module or circuit, only a kind of division of logic function, can there is other dividing mode when actually realizing.For this
For art personnel, it is clear that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and without departing substantially from this reality
In the case of with new spirit or essential attributes, the utility model can be realized in other specific forms.Therefore, no matter from
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the utility model is by appended
Claim rather than described above limit, it is intended that will fall the institute in the implication and scope of the equivalency of claim
Change and be included in the utility model.Any reference in claim should not be considered as to the involved right of limitation will
Ask.Furthermore, it is to be understood that the word of " comprising " one is not excluded for other units or step, odd number is not excluded for plural number.Stated in system claims
Multiple units or device can also be realized by same unit or device by software or hardware.The first, the second grade word
Pragmatic represents title, and is not offered as any specific order.
Embodiment of above is only unrestricted to illustrate the technical solution of the utility model, although preferably real with reference to more than
Mode is applied the utility model is described in detail, it will be understood by those within the art that, can be new to this practicality
The technical scheme of type is modified or equivalent substitution should not all depart from the spirit and scope of technical solutions of the utility model.
Claims (10)
1. a kind of ground digital television signal reception system based on power line transmission, it is characterised in that including for ground
Digital television signal system is coupled to signal modulation equipment on power line network and for the transmission signal solution on power line network
The signal demodulating apparatus of tune,
The input interface of the signal modulation equipment is connected with a digit signal receiver, and output interface connects with the power line network
Connect；
The input interface of the signal demodulating apparatus is connected with the power line network, and output interface connects with an at least audio-visual devices
Connect.
2. the ground digital television signal reception system based on power line transmission as claimed in claim 1, it is characterised in that institute
Stating signal modulation equipment includes being used to pre-process ground digital television signal generating the pretreatment module of TS streams, for described
The upper change of the modulation circuit that TS streams are modulated, the radiofrequency signal for the TS streams after the modulation to be upconverted to uhf band
Frequency circuit and for amplifying the rf power amplifier circuit of the radiofrequency signal and described for the radiofrequency signal to be coupled to
First isolation coupling circuit of power line network,
The input port of the signal pre-processing module is connected with the digit signal receiver, output port and the modulation electricity
Road, up-converter circuit, rf power amplifier circuit and the first isolation coupling circuit are sequentially connected；
The output port of the first isolation coupling circuit is connected with the power line network.
3. the ground digital television signal reception system based on power line transmission as claimed in claim 2, it is characterised in that institute
State pretreatment module include it is multiple be used for lock the power line network transmission signal frequency tuner, for DTMB signals
First demodulator circuit of demodulation, flow through for TS the TS stream process circuit of filter and descrambling generation TS transparent flows, for by the TS
The TS stream multiplex circuits of transparent flow and PSI information tables multiplexing process generation TS transport streams, wherein,
The input port of the multiple tuner is connected with the digit signal receiver, output port and the described first demodulation electricity
Road, TS stream process circuit and TS stream multiplex circuits are sequentially connected；
The output port of the TS streams multiplex circuit is connected with the input port of the modulation circuit.
4. the ground digital television signal reception system based on power line transmission as claimed in claim 1, it is characterised in that institute
Stating signal demodulating apparatus includes：
The the second isolation coupling circuit for obtaining transmission signal for carrying out isolation coupling to the power line network, second isolation
The input port of termination power is connected with the power line network；
For being filtered to the transmission signal and the signal processing circuit of power amplification, the input of the signal processing circuit
Port is connected with the output port of the isolation coupling circuit；
For carrying out the lower frequency changer circuit of down-converted, the input port of the lower frequency changer circuit and institute to the transmission signal
State the output port connection of signal processing circuit；
For analog signal to be converted into the analog to digital conversion circuit of data signal, the input port of analog-digital conversion circuit as described and institute
State the output port connection of lower frequency changer circuit；
For carrying out the second demodulator circuit of TDS-OFDM demodulation, the input of second demodulator circuit to the data signal
Mouth is connected with the output port of analog-digital conversion circuit as described；
For to the signal after demodulation decode the main process task circuit of simultaneously output display signal, the input of the main process task circuit
Interface is connected with the output port of second demodulator circuit, and output port is connected with the audio-visual devices.
5. the ground digital television signal reception system based on power line transmission as claimed in claim 4, it is characterised in that also
Including a remote control, the signal demodulating apparatus also includes wireless communication line corresponding with the remote control, the channel radio
News circuit is connected with the main process task circuit.
6. the ground digital television signal reception system based on power line transmission as claimed in claim 5, it is characterised in that institute
State remote control by infrared communication, Bluetooth communication, 2.4G is wireless and the one or more and signal of ZigBee communication mode
Demodulated equipment connects.
7. the ground digital television signal reception system based on power line transmission as claimed in claim 1, it is characterised in that institute
Stating digit signal receiver includes a terrestrial DTV antenna, and the power line signal modulating equipment passes through coaxial cable and institute
State the connection of terrestrial DTV antenna.
8. the ground digital television signal reception system based on power line transmission as claimed in claim 3, it is characterised in that institute
Stating TS stream multiplex circuits includes a fpga chip, and the fpga chip connects the TS stream process circuit and modulation circuit.
9. the ground digital television signal reception system based on power line transmission as claimed in claim 3, it is characterised in that institute
Stating the first demodulator circuit includes DTMB chips, the DTMB chips respectively with the multiple tuner and the TS stream process circuit
Connection.
10. the ground digital television signal reception system based on power line transmission as claimed in claim 3, it is characterised in that
The modulation circuit includes a TDS-OFDM modulation chips, and the TDS-OFDM modulation chips flow multiplex circuit and upper with TS respectively
Frequency changer circuit connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720395977.7U CN206640720U (en) | 2017-04-14 | 2017-04-14 | Ground digital television signal reception system based on power line transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720395977.7U CN206640720U (en) | 2017-04-14 | 2017-04-14 | Ground digital television signal reception system based on power line transmission |
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| Publication Number | Publication Date |
|---|---|
| CN206640720U true CN206640720U (en) | 2017-11-14 |
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ID=60245664
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720395977.7U Active CN206640720U (en) | 2017-04-14 | 2017-04-14 | Ground digital television signal reception system based on power line transmission |
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| Country | Link |
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| CN (1) | CN206640720U (en) |
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2017
- 2017-04-14 CN CN201720395977.7U patent/CN206640720U/en active Active
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