CN102904734B - Network-based all-digital broadcasting system - Google Patents
Network-based all-digital broadcasting system Download PDFInfo
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- CN102904734B CN102904734B CN201210372347.XA CN201210372347A CN102904734B CN 102904734 B CN102904734 B CN 102904734B CN 201210372347 A CN201210372347 A CN 201210372347A CN 102904734 B CN102904734 B CN 102904734B
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Abstract
The invention provides a network-based all-digital broadcasting system which comprises a central broadcasting system and a plurality of station broadcasting systems, wherein the broadcasting system comprises broadcasting equipment and a web master; the broadcasting equipment comprises a control box, a speech synthesis module, a switchboard, a network-based digital power amplifier and a double-interface device; the control box, the speech synthesis module, the network-based digital power amplifier and the double-interface device are all connected with the switchboard; and the central broadcasting system and the station broadcasting systems are connected with the network by the double-interface device. The beneficial effects are as follows: the system has strong anti-jamming capability; each device in the system is small in size and light in weight; the system is convenient to maintain and not limited by broadcasting areas and signal sources and has excellent expansibility; extra equipment is not needed; the power amplifier can be automatically switched and the turn-on time can be delayed automatically; the main and standby relation of the power amplifier can be set randomly; the priority level of the system broadcasting can reach 65535 level and meet all requirements; and the overall efficiency of the system can reach over 85%.
Description
Technical field
The invention belongs to broadcasting system field, especially relate to the digital broadcast system of a kind of network-type.
Background technology
At present, the Ethernet audio transmission techniques of comparative maturity mainly CobraNet and EtherSound technology.
CobraNet is the network audio Real-time Transmission that comprehensive hardware, software and communication protocol are integrated, and its patent right is in PeakAudio company of the U.S..One of object of exploitation CobraNet find on the computer network platform of high speed development exactly a kind of in real time, the method for stable professional audio transfer of data, this is also one of important directions of developing of professional audio field in the future.
EtherSound is the open standard that a kind of digital audio developed by Digigram is networked, and it uses the Ethernet parts of standard, follows IEEE 802.3 agreement; These two kinds of technology respectively have length, but want that the system built all exists some gaps with us.
These two kinds of technology have respective Pros and Cons, select different transmission technologys according to different purposes.General meeting/broadcasting engineering design is laid particular stress on functional and autgmentability, is ignored the requirement of ultrashort time delay, should use CobraNet; On-the-spot performance occasion lays particular stress on the demand of ultrashort time delay and rapid Design installation, ignores complicated function and network management capabilities, should use EtherSound technology.
Although the Ethernet audio transmission techniques of above-mentioned two kinds of comparative maturities respectively has length, in these two kinds of technology, Ethernet and audio transmission techniques are independent, do not have a kind of scheme integrating network and audio transmission.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of broadcast system, the digital broadcast system of especially a kind of network-type.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The digital broadcast system of a kind of network-type, comprise a center broadcast system and multiple website broadcast system, described broadcast system comprises broadcasting equipment and webmaster terminal, it is characterized in that: described broadcasting equipment comprises control box, voice synthetic module, switch, network digital power amplifier and two net-port device with one, described control box, voice synthetic module, network digital power amplifier is all connected with described switch with described pair of net-port device with one, described center broadcast system and each website broadcast system are all connected to the network by described pair of net-port device with one, described pair of net-port device with one comprises network interface, arm processor, audio codec, serial ports, audio frequency exports and audio frequency input, described network interface, arm processor and described audio codec are linked in sequence successively, described audio codec exports with described audio frequency and audio frequency input is connected, described serial ports is connected with described arm processor, described pair of net-port device with one provides power supply by external power source module.
Described network digital power amplifier comprises power module, power amplifier, output transformer, output switching plate, network interface board and display control board, described power module is connected with described output switching plate, described output switching plate is connected with described display control board, described display control board is connected with described network interface board, described network interface board is connected with described power amplifier, described power amplifier and described display control board, output switching plate is connected with described output transformer, described output transformer is connected with loud speaker, described output switching plate is connected with power amplifier for subsequent use cascade for subsequent use, described power module is connected with AC power with insurance by switch.
Described network digital power amplifier is provided with power amplifier and postpones start control circuit, described power amplifier postpones start control circuit and comprises main power source, accessory power supply, network interface board, 51-CPU plate, relay and alternating current input power supplying switch, when described alternating current input power supplying switch closes, namely described accessory power supply provides power supply to described network interface board and described 51-CPU plate, described network interface board postpones the regular hour, boot-strap information is sent to described 51-CPU plate by serial ports, described 51-CPU plate controls the described actuating of relay, connect described main power source, to time of delay to power amplifier power.
Described output switching plate is provided with standby usage power amplifier commutation circuit.
Described voice synthetic module comprises work indicating member, ARM core board, network card chip, transformer, network interface and SD card interface, described work indicating member and ARM core board, network card chip, transformer and network interface are linked in sequence successively, described SD card is connected with described ARM core board, and described voice synthetic module provides power supply by externally fed module.
Described control box is network-type control box, described network-type control box comprises audio frequency and power panel, control board, finger-board and network-type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described network-type control box interface board comprises emergent broadcast audio input interface, emergent broadcast audio output interface and emergency flight control interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, and emergency flight control interface is connected with control board.
Described control box is serial ports type control box, described serial ports type control box comprises audio frequency and power panel, control board, finger-board and serial ports type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described serial ports type control box interface board comprises broadcast audio input interface, broadcast audio output interface, monitors input interface, monitors output interface, emergency flight control input interface and emergency flight control output interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, and emergency flight control input interface is connected with control board.
Also comprise other interfaces, other interfaces described are the one or more interfaces in master control, ATC, clock, fire-fighting and telephone-broadcast interface.
The interface type of other interfaces described comprises RS422/485 interface, network interface, input dry contact interface, exports dry contact interface, analogue audio frequency input interface and analogue audio frequency output interface.
The advantage that the present invention has and good effect are:
1. audio signal adopts digital processing, and antijamming capability is strong
2. in system, each equipment volume is little, lightweight
3. system adopts network to connect, and is convenient to safeguard
4. the favorable expandability of system, without the restriction of service area and signal source
5. need not additional equipment, power amplifier can automatically switch, automatically delaying start
6. the standby usage relation of power amplifier is arranged arbitrarily
7. the priority of system broadcasts reaches 65535 grades, meets all demands
8. entire system efficiency is high, can reach more than 85%
Accompanying drawing explanation
Fig. 1 is broadcast system composition frame chart of the present invention
Fig. 2 is the theory diagram of of the present invention pair of net-port device with one
Fig. 3 is the block diagram that power amplifier of the present invention postpones start control circuit
Fig. 4 is standby usage power amplifier switching principle block diagram of the present invention
Fig. 5 is the operation principle block diagram of network digital power amplifier of the present invention
Fig. 6 is the theory diagram of voice synthetic module of the present invention
Fig. 7 is the theory diagram for network-type control box embodiment of the present invention
Fig. 8 is the theory diagram for serial ports type control box embodiment of the present invention
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further elaborated:
As shown in Figure 1, the invention provides the digital broadcast system of a kind of network-type, comprise a center broadcast system and multiple website broadcast system, described broadcast system comprises broadcasting equipment and webmaster terminal, it is characterized in that: described broadcasting equipment comprises control box, voice synthetic module, switch, network digital power amplifier and two net-port device with one, described control box, voice synthetic module, network digital power amplifier is all connected with described switch with described pair of net-port device with one, described center broadcast system and each website broadcast system are all connected to the network by described pair of net-port device with one.Center broadcast system and each website broadcast system can self-organizing systems independently, also can connect to form a large system by network.Two net-port device with one is responsible for forwarding related data information, and filters the data message not needing to forward.Described webmaster terminal comprises portable net tube terminal and fixed webmaster terminal, and portable net tube terminal is located at each website broadcast system, and fixed webmaster terminal is located at center broadcast system.
As shown in Figure 2, two net-port device with one comprises network interface, arm processor, audio codec, serial ports, audio frequency exports and audio frequency inputs, described network interface, arm processor and described audio codec are linked in sequence successively, described audio codec exports with described audio frequency and audio frequency input is connected, described serial ports is connected with described arm processor, and described pair of net-port device with one provides power supply by external power source module.The combination of Audiotechnica and network transmission technology is achieved by simple, controlled two net-port device with ones.Described pair of net-port device with one is 44.1kHz/16bit to the sample rate of audio signal, and described audio codec selects the chip of band volume and tone control, is mainly used in substituting complicated DSP process.
As shown in Figure 4, described network digital power amplifier comprises power module, power amplifier, output transformer, output switching plate, network interface board and display control board, described power module is connected with described output switching plate, described output switching plate is connected with described display control board, described display control board is connected with described network interface board, described network interface board is connected with described power amplifier, described power amplifier and described display control board, output switching plate is connected with described output transformer, described output transformer is connected with loud speaker, described output switching plate is connected with power amplifier for subsequent use cascade for subsequent use, described power module is connected with AC power with insurance by switch.The cascade that described output switching plate completes power amplifier output switches, monitors sampling and mains switch control etc., and described network interface board adopts unified network interface board, completes the transmitting-receiving process of the network information.
Power module in described network digital power amplifier is AC/DC Switching Power Supply, described Switching Power Supply has ± and 37V and ± 15V two groups output, to meet equipment needs; Described power amplifier is D class power amplifier, and output audio power is not less than 240W; Described output transformer is toroidal transformer, and power is not less than 300W, and no-load voltage ratio is 26.8:100; Described display control board comprises LCD display and CPU controls, and LCD is 122*32 dot matrix, monochromatic; CPU is STC series main flow model.In addition, also should have action button at the front panel of power amplifier, the operation carrying out some necessity controls.Spiral should be selected to fly shuttle.
In a broadcast system, generally there is multiple stage power amplifier, if all power amplifiers are started shooting simultaneously, larger impact will be caused to electrical network, therefore, require that the power amplifier in system postpones start, to reduce the impact to electrical network by platform.So, network digital power amplifier also comprises power amplifier and postpones start control circuit (as shown in Figure 3), described power amplifier postpones start control circuit and comprises main power source, accessory power supply, network interface board, 51-CPU plate, relay and alternating current input power supplying switch, when described alternating current input power supplying switch closes, described accessory power supply (± 15V) namely provides power supply to described network interface board and described 51-CPU plate, described network interface board postpones the regular hour, boot-strap information is sent to described 51-CPU plate by serial ports, described 51-CPU plate controls the described actuating of relay, connect described main power source, to time of delay to power amplifier power, power amplifier is started shooting, be in the value determination starting-up delay time of the network interface board in power amplifier according to IP, every platform power amplifier postpones 250 milliseconds.
In broadcast system, it is one of very important function that primary/standby devices switches, so the output switching plate in network digital power amplifier is provided with standby usage power amplifier commutation circuit (as shown in Figure 5), in order to complete when primary power amplifier breaks down, be switched to power amplifier for subsequent use.In figure, have two relays in each power amplifier, stain represents the normally closed point of relay, and white point represents the normal battle of relay.When primary power amplifier is normal, two relays are all in attracting state, and primary power amplifier exports by self and drives loud speaker, and power amplifier for subsequent use exports then through to the most next power amplifier; When primary power amplifier fault (in as figure shown in second primary power amplifier), two relays all discharge, then drive loud speaker by power amplifier for subsequent use, meanwhile, disconnect the connection of power amplifier for subsequent use and the most next power amplifier.
The implementation method that power amplifier switches is as follows:
(1) arranged power amplifier for subsequent use by network, the content of setting comprises the quantity of administrative primary power amplifier and the numbering of each primary power amplifier, and wherein, numbering corresponds to the 4th byte of IP address.
System specifies, the minimum backup as 1 primary power amplifier of every platform power amplifier for subsequent use, can back up 8 primary power amplifiers at most.
(2) in system cloud gray model, the power amplifier being in stand-by state sends monitoring information, monitoring administrative primary power amplifier state, when finding certain primary power amplifier fault, automatically substituting the work (receive and play corresponding audio data stream) of corresponding primary power amplifier.
(3), during device power, after the power amplifier being in master state receives the monitoring information of power amplifier for subsequent use, relevant information is sent, the operating state of expression itself.The power amplifier being in master state sends the state information of self by network timing, fixed time interval is 100-500 millisecond.
In power amplifier, network interface board can obtain the running status of this power amplifier by serial ports.
(4) switching of power amplifier has priority: the power amplifier priority that IP value is little is higher.
Certainly, even if there is primary power amplifier fault, but when not broadcasting, also without the need to switching.
As shown in Figure 6, voice synthetic module comprises work indicating member, ARM core board, network card chip, transformer, network interface and SD card interface, described work indicating member and ARM core board, network card chip, transformer and network interface are linked in sequence successively, described SD card is connected with described ARM core board, and described voice synthetic module provides power supply by externally fed module.This unit can be applicable in network-type broadcast system, completes phonetic synthesis information and plays.As shown in the figure, the core on phonetic synthesis doorway is ARM core board, extends out network interface and SD card interface.
The power supply of voice synthetic module is input as DC12V.
The circuit main devices of voice synthetic module is selected:
ARM core board is the embedding core board in sky, and its CPU is S3C2440 (ARM9).Core board contains FLASH and RAM of expansion.
The power supply chip of voice synthetic module selects TL2575 and SPX1117, and wherein, SPX1117 is that two panels is in parallel.
Power supply monitoring chip selects SP706S.
Other circuit hardware process of voice synthetic module:
(1) after power supply access arrangement, first rectifier diode is connect, to prevent reverse power connection.
(2) the quick twin zener dioder of the power sources in parallel of access arrangement, prevents surge.
(3) power supply monitoring IC is set in circuit.
The process of voice synthetic module software:
Voice synthetic module, only for the broadcast of phonetic synthesis, need write corresponding software according to application purpose.
So-called speech play is the voice document on time reading SD card, converts PCM code to, sends coded message by network.
The control box external interface of this broadcast system is network interface, by network transmitting-receiving audio-frequency information and control information.In addition, by changing the interface board of control box inside, the system that serial ports controls can be adapted to.
As shown in Figure 7, network-type control box comprises audio frequency and power panel, control board, finger-board and network-type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described network-type control box interface board comprises emergent broadcast audio input interface, emergent broadcast audio output interface and emergency flight control interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, and emergency flight control interface is connected with control board.
As shown in Figure 8, serial ports type control box comprises audio frequency and power panel, control board, finger-board and serial ports type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described serial ports type control box interface board comprises broadcast audio input interface, broadcast audio output interface, monitors input interface, monitors output interface, emergency flight control input interface and emergency flight control output interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, and emergency flight control input interface is connected with control board.
As shown in Figure 7,8, control box inside comprises 4 wiring boards, and its sound intermediate frequency and power panel, control board, finger-board are identical in two kinds of control boxes, and difference is only interface board.
In control box, the Main Function of each wiring board is as follows:
(1) audio frequency and power panel (hereinafter referred to as audio board)
Audio board completes the amplification of audio signal, volume controls and Power convert etc., and comprises part external interface.
(2) control board
Control board mainly contains core board, network interface card, sound card, also has display interface, completes control and Graphics Processing.
(3) finger-board
Mainly comprise key circuit, provide push button signalling to control board.
(4) network-type control box interface board
For in network-type Broadcasting Control box.Because the information exchange of network-type Broadcasting Control box carrys out automatic network, so its interface board is fairly simple, only comprise the output of emergent broadcast, input and control.
(5) serial ports type control box interface board
Exporting for comprising broadcast audio in serial ports type Broadcasting Control box, monitoring audio frequency input and emergent broadcast control etc.
Control box functional realiey illustrates:
(1) microphone and audio frequency amplify:
Microphone is gooseneck type, electret, is inserted on the panel of control by card agriculture socket, then connects audio board by CH2.54-2 socket.
Microphone audio amplifier circuit be two-stage amplify, and after the first order amplifying circuit parallel diode, to prevent audio output signal excessive.
(2) volume controls
Volume controls to comprise microphone broadcast volume, circuit broadcast volume and monitor volume to control, and adopt TDA7448 chip, this chip is 6 passages, utilizes 3 passages wherein, and control the volume of microphone, circuit and monitoring respectively, the control interface of TDA7448 chip is I
2c.
(3) intercut
In audio board, arrange one " adder " after volume controls, microphone audio frequency and circuit audio frequency are added, the volume that can control microphone and circuit respectively realizes the function intercutted.
(4) monitor
Monitor chip and select TDA7052, simple circuit, peak power output is about 1W.
(5) Power convert in audio board
In audio board, the 24V electricity of input is converted to+9V and two+5V ,+a 9V and adopts 7809 three-terminal regulator blocks to change out, for amplifier and volume control circuit, the electric current of+9V is about 20mA; + 5V is two-way, and a road TL2575 changes out, maximum output current 1A, and for monitoring circuit, monitoring circuit about needs 350mA (1W); Another road LM2576 changes out, maximum output current 3A, and for control board work, control board operating current is about 1.5A.
(6) network and RS422 switch
Network-type Broadcasting Control box output network signal, serial ports type Broadcasting Control box exports RS422 signal.For this reason, in audio board, arrange a CH2.54-7 socket and a RJ45 socket, these two sockets are corresponding in the circuit board to be connected, and CH2.54-7 socket is by cable connection control plate.When selecting network, the network interface of CH2.54-7 socket connection control plate, signal wherein comprises network transmitting-receiving, connection, speed and 3.3V power supply; When selecting RS422, the RS422 mouth of CH2.54-7 socket connection control plate, signal wherein comprises the net of RS422 and receives and dispatches, receives and dispatches instruction and 3.3V power supply.
(7) core board
Core board is the heart of Broadcasting Control box, running control software, with LINUX operating system.
Core board is TQ2440_V2 (Guangzhou Tian Qian computer Science and Technology Ltd.), and 4 socket pins, connect corresponding signal as required.
(8) sound card
Sound card chip is UDA1341TS, and band AD and DA, passes through I
2s and L3 interface connects core board.
(9) network interface card
Network card chip is DM9000, connects core board by data/address bus.
(10) display screen
Display screen is 5.6 inches of TFT screens, and model is AT056TN52_V.3, drives it to show by core board.
(11) Power convert on control board
The power supply of control board, from audio board, is DC5V, maximum current 3A.
On control board, need the various power supplys changed out needed for 3.3V and display screen.
3.3V LM1117-33 changes, and considers that electric current needed for control board is comparatively large, needs with two panels LM1117-33 in parallel.
The power supply MAX8726 that display screen needs changes, and can change out the power supplys such as+9.3V ,+15V ,-10V, meet the needs of display screen.
(12) keyboard
Keyboard is one piece of independent wiring board, adopts touchly to touch keyboard, and keystroke handling chip is ST08B, and each chip can be with 8 buttons.
Finger-board arranges two ST08B, totally 16 buttons.These 16 buttons comprise 10 numerical keys, circuit key, voice key, monitoring key, standard-sized sheet/complete shut-down key, arrange key and cancel key etc.
Each button is all with lamp.
Finger-board is connected with control board by 4 line cables, and the signal in cable comprises I
2c and VDD-to-VSS.
(13) microphone and emergence button
Microphone button and emergence button are two independently buttons, do not belong to finger-board.These two buttons also connection control plate.When key is pressed, optocoupler conducting, CPU identifies key-press status, and meanwhile, the lamp in button is lit.
This broadcast system has also comprised other interfaces that broadcast system is connected with other system, other interfaces described are interfaces of broadcast system and other system, complete corresponding function, other interfaces described are the one or more interfaces in master control, ATC (automatic traveling crane), clock, fire-fighting and telephone-broadcast interface.
Described interface type comprises RS422/485 interface, network interface, input dry contact interface, exports dry contact interface, analogue audio frequency input interface, analogue audio frequency output interface.In addition, in order to adapt to the application of noise probe, interface unit reserves power output terminal.
For simplified design, plan the separately design of each class interface, be defined as corresponding functional unit, and effectively reduce unit volume.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (9)
1. the digital broadcast system of network-type, comprise a center broadcast system and multiple website broadcast system, described broadcast system comprises broadcasting equipment and webmaster terminal, it is characterized in that: described broadcasting equipment comprises control box, voice synthetic module, switch, network digital power amplifier and two net-port device with one, described control box, voice synthetic module, network digital power amplifier is all connected with described switch with described pair of net-port device with one, described center broadcast system and each website broadcast system are all connected to the network by described pair of net-port device with one, described pair of net-port device with one comprises network interface, arm processor, audio codec, serial ports, audio frequency exports and audio frequency input, described network interface, arm processor and described audio codec are linked in sequence successively, described audio codec exports with described audio frequency and audio frequency input is connected, described serial ports is connected with described arm processor, described pair of net-port device with one provides power supply by external power source module.
2. the digital broadcast system of network-type according to claim 1, it is characterized in that: described network digital power amplifier comprises power module, power amplifier, output transformer, output switching plate, network interface board and display control board, described power module is connected with described output switching plate, described output switching plate is connected with described display control board, described display control board is connected with described network interface board, described network interface board is connected with described power amplifier, described power amplifier and described display control board, output switching plate is connected with described output transformer, described output transformer is connected with loud speaker, described output switching plate is connected with power amplifier for subsequent use cascade for subsequent use, described power module is connected with AC power with insurance by switch.
3. the digital broadcast system of network-type according to claim 2, it is characterized in that: described network digital power amplifier is provided with power amplifier and postpones start control circuit, described power amplifier postpones start control circuit and comprises main power source, accessory power supply, network interface board, 51-CPU plate, relay and alternating current input power supplying switch, when described alternating current input power supplying switch closes, namely described accessory power supply provides power supply to described network interface board and described 51-CPU plate, described network interface board postpones the regular hour, boot-strap information is sent to described 51-CPU plate by serial ports, described 51-CPU plate controls the described actuating of relay, connect described main power source, to time of delay to power amplifier power.
4. the digital broadcast system of network-type according to claim 2, is characterized in that: described output switching plate is provided with standby usage power amplifier commutation circuit.
5. the digital broadcast system of network-type according to claim 1, it is characterized in that: described voice synthetic module comprises work indicating member, ARM core board, network card chip, transformer, network interface and SD card interface, described work indicating member and ARM core board, network card chip, transformer and network interface are linked in sequence successively, described SD card is connected with described ARM core board, and described voice synthetic module provides power supply by externally fed module.
6. the digital broadcast system of network-type according to claim 1, it is characterized in that: described control box is network-type control box, described network-type control box comprises audio frequency and power panel, control board, finger-board and network-type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described network-type control box interface board comprises emergent broadcast audio input interface, emergent broadcast audio output interface and emergency flight control interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, and emergency flight control interface is connected with control board.
7. the digital broadcast system of network-type according to claim 1, it is characterized in that: described control box is serial ports type control box, described serial ports type control box comprises audio frequency and power panel, control board, finger-board and serial ports type control box interface board, described audio frequency and power panel, control board and finger-board are linked in sequence, described serial ports type control box interface board comprises broadcast audio input interface, broadcast audio output interface, monitor input interface, monitor output interface, emergency flight control input interface and emergency flight control output interface, described emergent broadcast audio input interface is connected with audio frequency and power panel, emergency flight control input interface is connected with control board.
8. the digital broadcast system of network-type according to claim 1, is characterized in that: also comprise other interfaces, and other interfaces described are the one or more interfaces in master control, ATC, clock, fire-fighting and telephone-broadcast interface.
9. the digital broadcast system of network-type according to claim 8, is characterized in that: the interface type of other interfaces described comprises RS422/485 interface, network interface, input dry contact interface, exports dry contact interface, analogue audio frequency input interface and analogue audio frequency output interface.
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| CN103944659A (en) * | 2014-04-29 | 2014-07-23 | 天津市黎明时代轨道交通技术有限公司 | Digital amplifier server based on public broadcasting system |
| CN103929262A (en) * | 2014-04-29 | 2014-07-16 | 天津市黎明时代轨道交通技术有限公司 | Digital broadcasting server based on public broadcasting system |
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