CN107317981A - A kind of channel based on DVB C and DTMB receives switching control and method - Google Patents
A kind of channel based on DVB C and DTMB receives switching control and method Download PDFInfo
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- CN107317981A CN107317981A CN201710518386.9A CN201710518386A CN107317981A CN 107317981 A CN107317981 A CN 107317981A CN 201710518386 A CN201710518386 A CN 201710518386A CN 107317981 A CN107317981 A CN 107317981A
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Switching control and method are received the invention discloses a kind of channel based on DVB C and DTMB, device includes tuner, channel controlling switch, DTMB demodulators and central processing unit, central processing unit output control signal gives channel controlling switch, to select to receive DVB C signals or DTMB signals, when selection receives DVB C signals, the intermediate-freuqncy signal for the DVB C that channel controlling switch exports tuner is connected with central processing unit, and the intermediate-freuqncy signal to DVB C is demodulated and demultiplexed；When selection receives DTMB signals, the DTMB intermediate-freuqncy signals that tuner is exported are exported and give DTMB demodulators by channel controlling switch, and DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, and central processing unit is demultiplexed to the TS streams of input again.The present invention can be received, handled, amplified and exported to DVB C and DTMB signals, flexibly just be used.
Description
Technical field
The invention belongs to digital television broadcasting field, more particularly to a kind of channel based on DVB-C and DTMB receives switching
Control device and method.
Background technology
Current broadcast type digital cable TV (DVB-C) signal and broadcast type digital terrestrial television (DTMB) signal are each
Individual city is highly developed sound.People will watch that the TV programme in DVB-C and DTMB networks need corresponding receive
The DTV STB of the standard network can just receive the TV programme in corresponding network signal.
DTV STB can be divided into satellite digital television receiver set top box, cabled digital electricity by the difference according to transmission medium
Depending on set top box, terrestrial wireless DTV STB, terrestrial wireless digital television standard is that China possesses entirely autonomous knowledge production
The transmission standard of the terrestrial wireless DTV of power, the operator scheme with high flexible, by selecting different modulation systems
And address information, support fixed, portable, mobile receive.Turn into Chinese broadcast service terrestrial television signal from the standard in 2007
Pressure standard, terrestrial wireless digital television business starts fast development, and current most cities have released one after another free ground
Digital television program, but most of DTV STBs all only support DVB-C standard, it is impossible to realize to DTMB standard signals
Receive, user will receive terrestrial DTV program and there was only purchase set top box in addition, not only cause to waste using upper but also very inconvenient.
The content of the invention
In view of this, switching control dress is received it is an object of the invention to provide a kind of channel based on DVB-C and DTMB
Put and method, disclosure satisfy that the signal of different broadcast type digital TV networks receives demand.
To reach above-mentioned purpose, switching control is received the invention provides a kind of channel based on DVB-C and DTMB,
Including tuner, channel controlling switch, DTMB demodulators and central processing unit, wherein,
The tuner receives digital television signal, and the signal is radiofrequency signal, and tuner turns received signal
It is changed into intermediate-freuqncy signal；
The central processing unit output control signal give the channel controlling switch, with select receive DVB-C signals or
DTMB signals, when selection receives DVB-C signals, the DVB-C that channel controlling switch exports tuner intermediate-freuqncy signal and center
Processor is connected, and central processing unit is demodulated and demultiplexed to DVB-C intermediate-freuqncy signal, is classified as video flowing, audio stream
And data flow；When selection receives DTMB signals, channel controlling switch exports the DTMB intermediate-freuqncy signals that tuner is exported to described
DTMB demodulators, the DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, and central processing unit is again to defeated
The TS streams entered are demultiplexed, and signal is divided into video flowing, audio stream and data flow.
Preferably, when the central processing unit selection receives DVB-C signals, the DVB-C that its QAM interface is exported with tuner
Intermediate-freuqncy signal connection.
Preferably, the channel controlling switch includes first switch module, second switch module and the 3rd switch module.
Preferably, the first switch module and second switch module respectively include an AZAW2210F chips.
Preferably, the tuner includes M88TC3800 chips, and DTMB demodulators include M88DD6301 chips.
Based on above-mentioned purpose, method for handover control is received present invention also offers a kind of channel based on DVB-C and DTMB,
It is characterised in that it includes following steps：
Tuner receives digital television signal, and the signal is radiofrequency signal, and received signal is changed into by tuner
Intermediate-freuqncy signal；
Central processing unit output control signal gives channel controlling switch, and selection receives DVB-C signals or DTMB signals；
If selection receives DVB-C signals, the intermediate-freuqncy signal for the DVB-C that channel controlling switch exports tuner is with
Central processor is connected, and central processing unit is demodulated and demultiplexed to DVB-C intermediate-freuqncy signal, is classified as video flowing, audio
Stream and data flow；
If selection receives DTMB signals, channel controlling switch exports the DTMB intermediate-freuqncy signals that tuner is exported to described
DTMB demodulators, the DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, and central processing unit is again to defeated
The TS streams entered are demultiplexed, and signal is divided into video flowing, audio stream and data flow.
Preferably, if selection receives DVB-C signals, the QAM interfaces of central processing unit are with the DVB-C's of tuner output
Intermediate-freuqncy signal is connected.
Preferably, the channel controlling switch includes first switch module, second switch module and the 3rd switch module.
Preferably, the first switch module and second switch module respectively include an AZAW2210F chips.
Preferably, the tuner includes M88TC3800 chips, and DTMB demodulators include M88DD6301 chips.
The beneficial effects of the present invention are：
By setting tuner, channel controlling switch and DTMB demodulators, DVB-C signals and DTMB signals are changed
With branch transmission；When user needs to receive DVB-C signals, central processing unit makes channel control by control channel controlling switch
Switch process DVB-C signals processed, are transferred directly to central processing unit, so as to realize DVB-C by the DVB-C intermediate-freuqncy signals handled well
The broadcasting of signal program.When user needs to receive DTMB signals, central processing unit makes channel by control channel controlling switch
Controlling switch handles DTMB signals, and the DTMB intermediate-freuqncy signals handled well are transferred directly to after the demodulation of DTMB demodulators, flowed with TS
Form be transferred to central processing unit processing, so as to realize the broadcasting of DTMB signal programs.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 shows for the structure that the channel based on DVB-C and DTMB of apparatus of the present invention embodiment receives switching control
It is intended to；
Fig. 2 is former for the circuit that the channel based on DVB-C and DTMB of apparatus of the present invention embodiment receives switching control
Reason figure；
The step of Fig. 3 receives method for handover control for the channel based on DVB-C and DTMB of the inventive method embodiment is flowed
Cheng Tu.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Referring to Fig. 1, the channel based on DVB-C and DTMB for showing apparatus of the present invention embodiment receives switching control
Structural representation, including tuner 1, channel controlling switch 2, DTMB demodulators 3 and central processing unit 4, wherein,
Tuner 1 receives digital television signal, and the signal is radiofrequency signal, and tuner 1 changes received signal
For intermediate-freuqncy signal；
The output control signal of central processing unit 4 is to channel controlling switch 2, to select to receive DVB-C signals or DTMB signals,
When selection receives DVB-C signals, the DVB-C that channel controlling switch 2 exports tuner 1 intermediate-freuqncy signal and central processing unit 4
Connection, central processing unit 4 is demodulated and demultiplexed to DVB-C intermediate-freuqncy signal, is classified as video flowing, audio stream and data
Stream；When selection receives DTMB signals, the DTMB intermediate-freuqncy signals that tuner 1 is exported are exported and demodulated to DTMB by channel controlling switch 2
Device 3, DTMB demodulators 3, which are demodulated to it and export TS, to flow to central processing unit 4, and central processing unit 4 flows to the TS of input again
Demultiplexed, signal is divided into video flowing, audio stream and data flow.
By above-mentioned setting, device can flexibly receive DVB-C signals or DTMB signals.DVB-C signals are received in selection
When, it is that, by tuner 1 and channel controlling switch 2, the control channel controlling switch 2 of central processing unit 4 exports tuner 1
DVB-C intermediate-freuqncy signal is exported to central processing unit 4；When selection receives DTMB signals, channel controlling switch 2 is by tuner 1
The DTMB of output intermediate-freuqncy signal is connected with DTMB demodulators 3, is exported again after demodulation to central processing unit 4,4 pairs of central processing unit
The signal demultiplexing received, is classified as video flowing, audio stream and data flow, can then export to amplifirer, finally lead to
Cross loudspeaker broadcasting.
In specific embodiment, when the selection of central processing unit 4 receives DVB-C signals, its QAM interface is exported with tuner 1
DVB-C intermediate-freuqncy signal connection.Channel controlling switch 2 includes first switch module, second switch module and the 3rd switch module
First switch module and second switch module respectively include the AZAW2210F chips of Amazing limited company, the 3rd switch
Module includes the AZAW2210T chips of Amazing limited company.Tuner 1 includes Lan Qi Science and Technology Ltd.s
M88TC3800 chips, the DTMB demodulators 3 of cooperation include the M88DD6301 chips of Lan Qi Science and Technology Ltd.s, central processing unit
4 include the HI3716 chips of HiSilicon of Huawei.
Circuit theory diagrams are referring to Fig. 2, if selection accesses DVB-C signals, the 44 of the HI3716 chips U4 of central processing unit 4
The control triode Q1 conductings of foot control signal output high level, triode Q2 cut-offs, so that the first of channel controlling switch 2 opens
The 10 pin input for closing module U2_1 is low level, and the 3rd switch module U2_3 10 pin input is low level, second switch module
U2_2 1 pin input is low level, and the input of 7 pin is high level；Make 11,12,16, the 17 of the M88TC3800 chips U1 of tuner 1
Signal and communications pins are connected with the HI3716 chips U4 of central processing unit 4 88,87,83,82 signals and communications pins, lead to
Letter uses IIC modes, so that the HI3716 chips U4 of central processing unit 4 is demodulated to the DVB-C intermediate-freuqncy signals received, solved
Multiplexing, is divided into video flowing, audio stream and data flow by signal.If during selection access DTMB signals, the HI3716 of central processing unit 4
Chip U4 44 foot control signal output low level control triode Q1 cut-offs, triode Q2 conductings, so that channel control is opened
The 10 pin input for closing 2 first switch module U2_1 is high level, and the 3rd switch module U2_3 10 pin input is high level, the
Two switch module U2_2 1 pin input is high level, and the input of 7 pin is low level；Make the M88TC3800 chips U1's of tuner 1
11st, the M88DD6301 chips U3 of 12,16,17 signals and communications pins and DTMB demodulators 3 17,16,25,24 signals and logical
Letter pin is connected, so as to after the DTMB intermediate-freuqncy signals that 3 pairs of DTMB demodulators are received are demodulated, export TS signals to center
The HI3716 chips U4 of processor 4.The HI3716 chips U4 of central processing unit 4 is demultiplexed to the TS streams of input again, will be believed
Number it is divided into video flowing, audio stream and data flow.Tuner 1, channel controlling switch 2, DTMB demodulators 3 and central processing unit 4 it
Between communicated by IIC, central processing unit 4 is also sent in AGC control signals, specific embodiment to channel controlling switch 2
To be sent to second switch module U2_2, the M88TC3800 chips of second switch module U2_2 respective pin also with tuner 1
AGC pins be connected with the AGC pins of the M88DD6301 chips of DTMB demodulators 3.
Corresponding with the above-mentioned channel reception switching control based on DVB-C and DTMB, present invention also offers one
Plant the channel based on DVB-C and DTMB and receive method for handover control.
Referring to Fig. 3, the channel based on DVB-C and DTMB for showing the inventive method embodiment receives method for handover control
Step flow chart, comprise the following steps：
S101, tuner receives digital television signal, and the signal is radiofrequency signal, and tuner turns received signal
It is changed into intermediate-freuqncy signal；
S102, central processing unit output control signal gives channel controlling switch, and selection receives DVB-C signals or DTMB letters
Number；
S103, if selection receives DVB-C signals, the intermediate frequency letter for the DVB-C that channel controlling switch exports tuner
Number it is connected with central processing unit, central processing unit is demodulated and demultiplexed to DVB-C intermediate-freuqncy signal, is classified as video
Stream, audio stream and data flow；
S104, if selection receives DTMB signals, the DTMB intermediate-freuqncy signals that channel controlling switch exports tuner are exported
DTMB demodulators are given, DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, central processing unit is again to input
TS stream demultiplexed, signal is divided into video flowing, audio stream and data flow.
Through above-mentioned steps, DVB-C and DTMB transmitting-receiving control can be carried out, can receive and handle two kinds of signals to play.
Method specific embodiment will not be described here referring to said apparatus embodiment.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (10)
1. a kind of channel based on DVB-C and DTMB receives switching control, it is characterised in that including tuner, channel control
System switch, DTMB demodulators and central processing unit, wherein,
The tuner receives digital television signal, and the signal is radiofrequency signal, and received signal is changed into by tuner
Intermediate-freuqncy signal；
The central processing unit output control signal gives the channel controlling switch, is believed with selecting to receive DVB-C signals or DTMB
Number, when selection receives DVB-C signals, the DVB-C that channel controlling switch exports tuner intermediate-freuqncy signal and central processing unit
Connection, central processing unit is demodulated and demultiplexed to DVB-C intermediate-freuqncy signal, is classified as video flowing, audio stream and data
Stream；When selection receives DTMB signals, the DTMB intermediate-freuqncy signals that tuner is exported are exported and solved to the DTMB by channel controlling switch
Device is adjusted, the DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, the TS of central processing unit again to input
Stream is demultiplexed, and signal is divided into video flowing, audio stream and data flow.
2. the channel according to claim 1 based on DVB-C and DTMB receives switching control, it is characterised in that institute
When stating central processing unit selection reception DVB-C signals, the intermediate-freuqncy signal for the DVB-C that its QAM interface is exported with tuner is connected.
3. the channel according to claim 1 based on DVB-C and DTMB receives switching control, it is characterised in that institute
Stating channel controlling switch includes first switch module, second switch module and the 3rd switch module.
4. the channel according to claim 3 based on DVB-C and DTMB receives switching control, it is characterised in that institute
Stating first switch module and second switch module respectively includes an AZAW2210F chips.
5. the channel according to claim 1 based on DVB-C and DTMB receives switching control, it is characterised in that institute
Stating tuner includes M88TC3800 chips, and DTMB demodulators include M88DD6301 chips.
6. a kind of channel based on DVB-C and DTMB receives method for handover control, it is characterised in that comprise the following steps：
Tuner receives digital television signal, and the signal is radiofrequency signal, and received signal is changed into intermediate frequency by tuner
Signal；
Central processing unit output control signal gives channel controlling switch, and selection receives DVB-C signals or DTMB signals；
If selection receives DVB-C signals, the DVB-C that channel controlling switch exports tuner intermediate-freuqncy signal and centre
Manage device connection, central processing unit is demodulated and demultiplexes to DVB-C intermediate-freuqncy signal, be classified as video flowing, audio stream and
Data flow；
If selection receives DTMB signals, channel controlling switch exports the DTMB intermediate-freuqncy signals that tuner is exported to the DTMB
Demodulator, the DTMB demodulators, which are demodulated to it and export TS, to flow to central processing unit, and central processing unit is again to input
TS streams are demultiplexed, and signal is divided into video flowing, audio stream and data flow.
7. the channel according to claim 6 based on DVB-C and DTMB receives method for handover control, it is characterised in that if
When selection receives DVB-C signals, the intermediate-freuqncy signal for the DVB-C that the QAM interfaces of central processing unit are exported with tuner is connected.
8. the channel according to claim 6 based on DVB-C and DTMB receives method for handover control, it is characterised in that institute
Stating channel controlling switch includes first switch module, second switch module and the 3rd switch module.
9. the channel according to claim 8 based on DVB-C and DTMB receives method for handover control, it is characterised in that institute
Stating first switch module and second switch module respectively includes an AZAW2210F chips.
10. the channel according to claim 6 based on DVB-C and DTMB receives method for handover control, it is characterised in that institute
Stating tuner includes M88TC3800 chips, and DTMB demodulators include M88DD6301 chips.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710518386.9A CN107317981B (en) | 2017-06-29 | 2017-06-29 | Channel receiving switching control device and method based on DVB-C and DTMB |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710518386.9A CN107317981B (en) | 2017-06-29 | 2017-06-29 | Channel receiving switching control device and method based on DVB-C and DTMB |
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| CN107317981B (en) | 2024-04-19 |
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