CN109672460A - A kind of asynchronous LED screen receives the system and method for DAB emergency information - Google Patents
A kind of asynchronous LED screen receives the system and method for DAB emergency information Download PDFInfo
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- CN109672460A CN109672460A CN201910095988.7A CN201910095988A CN109672460A CN 109672460 A CN109672460 A CN 109672460A CN 201910095988 A CN201910095988 A CN 201910095988A CN 109672460 A CN109672460 A CN 109672460A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention belongs to public safety technical fields, disclose a kind of system and method for asynchronous LED screen reception DAB emergency information.The virtual USB disk for selecting LED screen to show that content is generated from external USB flash disk or DAB receiving module by USB switch chip.Under normal circumstances, in running background, the content that LED screen is shown obtains DAB receiving module from external USB flash disk.Once DAB receiving module detects that emergency information, triggering USB switch chip force selection LED to show that content comes from DAB receiving module.For the existing driving plate of compatible asynchronous LED screen, DAB receiving module uses virtual USB disk technology, the emergency information received is converted into a virtual USB disk, which is identified to show emergency information in LED screen by LED drive board.The method promptly and accurately can not only issue DAB emergency information to existing asynchronous LED screen, while not influence the original function of LED screen.
Description
Technical field
The invention belongs to the systems that public safety technical field more particularly to a kind of asynchronous LED screen receive DAB emergency information
And method.
Background technique
Currently, the prior art commonly used in the trade is such that
China has a vast territory, and geographical geology, weather conditions are complicated, is to endanger serious country by natural calamity in the world
One of.How to carry out effective early warning to disaster information to assure the safety for life and property of the people to the greatest extent is modern society
Always the great science and technology and livelihood issues paid close attention to.Nowadays, most of disaster can be obtained relatively accurate by scientific and technological means
Forecast information, and the approach for propagating these information mainly has mobile communication, internet, TV, broadcast, newspaper, phone etc..
Mobile communication and internet are easy blocking or damage in emergency although powerful, influence early warning letter
Cease the effect of publication.As communicated basic interruption after Wenchuan earthquake and Yaan earthquake, effective development of rescue work has been seriously affected；
The especially big mud-rock flow in the Minxian County of Gansu in 2012 and Beijing " 7.21 " torrential rain, Dongguan heavy hail in 2013, all because warning information is issued
It is not in place and lead to huge Loss of Life and property.On the other hand, simple, high reliablity and coverage area are broadcasted with its structure
Wide characteristic plays irreplaceable role in the information transmitting of Emergency time.Such as it is adjusted after Japanese Oc ean Tsunami for 2011
Look into display: 91% or more the common people are information to be obtained by various broadcast, and obtain only the 7% of information by internet, are led to
Cross newspaper and mobile phone obtain information less than 1%.
The most important feature of broadcast system is " a pair of of entirety (one to all) ", and is " a pair of the characteristics of communication system
Partially (one to some) ".For disaster occurs, compare communication system, using broadcast " a pair of all " the characteristics of can
The limitation of number of users is broken through, the user in coverage area can receive EWM (Emergency Warning Message)
That is warning information.Digital broadcasting is the broadcast system of new generation for replacing the analog broadcastings such as tradition FM and AM.Digital broadcasting is in addition to can
Outside the audio-frequency information for transmitting high quality, the multimedia messages such as picture, data can also be transmitted, this believes that digital broadcasting in early warning
The function of breath publication aspect is more powerful.Digital broadcasting professional standard DAB (Digital Audio is promulgated in 2006 in China
Broadcast), the ground such as Beijing, Guangdong have the broadcast of DAB signal.Currently, DAB further develops into DMB (Digital
Multimedia Broadcast) technology, it is possible to provide the more relatively rich media business such as video, navigation.National gas in 2008
The wide satellite DAB of generation, which is rented, as office carries out warning information publication.Within the system, after local the condition of a disaster is reported layer by layer by departments at different levels
By being issued by National Meteorological Bureau's connection satellite.Large range of covering may be implemented in this set system, some scholars it is also proposed that
Division warning and automatic early-warning technology based on the system.The system is mainly directed towards remote districts, the reception master of warning information
Will be based on the loudspeaker of fixed reception or dedicated reception terminal, content can only be text and voice, and receiver is being connected to early warning
The equipment such as electronic display can be output to after information by communication interface and show text information, can also external village " typhon " it is straight
Offer broadcast is provided.But in the densely populated environment such as city, this Terminal Type is using seldom, and main cause is because of loudspeaker mode
Early warning in noisy environment or is not easy to arouse attention or be easy to cause excessive fear；LED shows that text is currently one
The dedicated terminal of kind, i.e., this LED screen is only able to display DAB warning information, without other function, it is difficult to popularize in city.
On the other hand, in the big place of flows of the people such as shop doorway, unit doorway, street, crossing, it is dispersed with a large amount of use
In the asynchronous LED screen of propaganda or advertising.For these LED screens mostly based on text importing, content is concise, have largely by
Many groups, but these screens are voluntarily controlled by installation unit at present, and content passes through USB disk drive and replacement by manual type.Such as
It is rationally utilized, allows these screens to force the DAB warning information of display government publication in Emergency time, usually and not
Its normal function is influenced, undoubtedly there is important social value and the people's livelihood to be worth.
In conclusion problem of the existing technology is:
(1) the real-time sex-intergrade for issuing warning information towards high-volume user using internet and mobile communication, is easy
Existing information is lost and network blockage phenomenon；
(2) existing DAB Forewarning Terminal, the mainly special-purpose terminal based on audio and text, are mainly used for remotely
The warning information in area receives, and audient is limited；
(3) existing DAB Forewarning Terminal, although all can be with output character to LED screen, this LED screen it is dedicated, only
It can be used to DAB warning information show, can not show other information；
(4) existing installed asynchronous LED screen, does not support the reception of DAB warning information at present because lack with
The matched DAB receiver of LED drive board and control software.
Solve the difficulty of above-mentioned technical problem:
Technological difficulties are that existing hardware connection must not be influenced by increasing DAB receiver in existing asynchronous LED screen, with
The improvement cost of reduction system；The commercial use of LED screen usually cannot be influenced simultaneously；Warning information should only encounter nature calamity
Display is covered when harmful or emergency event in LED screen.
Solve the meaning of above-mentioned technical problem:
The present invention may make the existing asynchronous LED screen being largely distributed before not influencing its commercial use and normal use
It puts, it is automatic to receive DAB warning information and cover display by simple add-assembly.Since asynchronous LED screen is distributed in quotient more
The big place of flows of the people such as shop door mouth, unit doorway, street, crossing, the present invention are remarkably improved the coverage effect of warning information,
Important technological means is provided for the transmission of warning information；Meanwhile the present invention has also expanded the application range of digital broadcast technologies,
Digital broadcasting is converted to for the following analog broadcasting, and one new business scenario is provided.
Summary of the invention
In view of the problems of the existing technology, the present invention provides the sides that a kind of asynchronous LED screen receives DAB emergency information
Method.
The invention is realized in this way the system that a kind of asynchronous LED screen receives DAB emergency information.The asynchronous LED receives
The system of DAB emergency information includes: DAB radio frequency chip, demodulator chip, MCU chip, memory chip (virtual USB disk), USB
Switch chip, external USB flash disk, LED drive board, LED display.
The asynchronous LED receives in the system of DAB emergency information, and the function of each section is respectively as follows:
(1) DAB radio frequency chip moves the DAB signal received by antenna to intermediate frequency from radio frequency；
(2) demodulation chip demodulates DAB transmission frame data in the intermediate-freuqncy signal that radio frequency chip exports.Transmission frame data packet
Include fast traffic channel data (FIC) and main service channel (MSC) data；In general, emergency information is included in FIC data
In；
(3) MCU chip connects for controlling RF chip, demodulation chip, memory chip, USB switch chip and usb data
Mouthful；
(4) memory chip demodulates the data come for storing DAB, meanwhile, also as the storage of virtual USB disk；
(5) USB switch chip is the usb bus selection chip an of alternative, can be by a control signal by two
Being transmitted on output bus in the input bus of road all the way；
(6) external USB flash disk is exactly general USB flash disk, and asynchronous LED screen is exactly to be shown by reading the file in the USB flash disk；
(7) LED drive board is responsible for for the file in external USB flash disk or virtual USB disk being converted into the pixel-matrix of LED screen, and presses
It is shown according to the pixel of certain scanning mode driving LED screen；In general, LED drive board manufacturer can provide one specially
LED screen content generate software, can be identified to Content Transformations such as the text, the pictures that show user at LED drive board
Private file；
(8) LED screen is used to show the pixel-matrix content of LED drive board transmission.
Further, the function of the MCU chip includes:
(1) MCU chip configures RF chip and demodulation chip by data-interfaces such as I2C, SPI, to complete the solution of DAB signal
Reconciled data decoding；
(2) MCU chip controls memory chip by memory interface and generates virtual USB disk；
(3) MCU chip generates new file in virtual USB disk and modifies file content by memory interface；
(4) MCU chip controls the selection signal of USB switch chip by programmable I/O；
(5) level and transmission data that MCU chip passes through programming Control USB interface；
Further, the memory chip is either nonvolatile memory (such as Flash, EEPROM), can also be with
It is volatile memory (such as SRAM, SDRAM)；The interface of memory chip is either parallel interface (AHB, FSMC interface
Deng), it is also possible to serial line interface (SPI, I2C etc.)；
Further, the capacity of the memory chip is depending on the demand of the size of LED screen and LED drive board；Generally
For, LED screen pixel is more, and the size of display file required for LED screen driving plate is bigger, and the memory chip just needs
Memory capacity that will be bigger；The particular capacity of memory chip, it is necessary to depending on the technical parameter in conjunction with LED screen driving plate, it is assumed that
It is M byte that LED screen content corresponding with LED screen driving plate, which generates software display file size generated, then memory chip
Particular capacity have to be larger than M byte.
The system that the asynchronous LED screen receives DAB emergency information, mounting means are as follows:
(1) before not installing device of the present invention, the composition of asynchronous LED screen includes external USB flash disk, LED control panel and LED
Display screen；Wherein, it is connected between external USB flash disk and LED control card by USB interface；
(2) before not installing device of the present invention, the brief working principle of asynchronous LED screen is that user passes through in LED screen
Hold generation software and the contents such as text to be shown, picture are converted into a special file；User copies the file to outer
It sets in USB flash disk；External USB flash disk is connect by user with LED drive board；LED drive board detects external USB flash disk, reads file therein, and
It is shown in LED screen；
(3) mounting means of device of the present invention can be briefly described as, original asynchronous LED screen external USB flash disk and
Between LED control panel, apparatus of the present invention are installed additional；
(4) it is connected between device of the present invention and LED drive board still through USB interface；Meanwhile the present apparatus provides one
A additional USB socket, for the external USB flash disk of grafting user, which is connected to by the USB switch chip 5 inside device
LED drive board；At this point, for a user, application method with not install apparatus of the present invention additional completely the same；
(5) due to being pluggable USB connection type in former asynchronous LED screen, between external USB flash disk and LED drive board, because
This, the installation of the present apparatus is very convenient, and does not need to do any change to original hardware；
Further, above-mentioned installation process can be briefly described as three steps:
(1) the external USB flash disk in former asynchronous LED screen is pulled out；
(2) device of the present invention is connected to LED drive board；
(3) the external USB flash disk pulled out is reinserted into device of the present invention.
In conclusion advantages of the present invention and good effect are as follows:
1, the good effect that the present invention has:
(1) direct effect: can correctly show DAB warning information the invention enables existing asynchronous LED display screen, and
Restore normal display state automatically after warning information revocation.
(2) present invention improves the coverage effect of warning information, provides important technological means for the transmission of warning information；
Meanwhile the present invention has also expanded the application range of digital broadcast technologies, provides a new business scenario for digit broadcasting system.
2, the advantages of present invention has:
(1) it is warning information that digital broadcasting mode is issued that the present invention is received, since digital broadcasting is in information transmitting
The problem of there is no blocking and delays, the warning information that the present invention receives is than the early warning based on mobile communication and interconnected network mode
Information is faster；
(2) due to digital broadcast technologies the characteristics of, all to be shown in advance in synchronization using asynchronous LED screen of the invention
Alert information, ensure that the consistency and instantaneity of warning information；
(3) method due to having used location matches, the present invention can effectively avoid displaying target region not comprising LED screen institute
False warning information in position, avoids excessive early warning from generating a panic；
(4) device of the present invention can directly be powered by the USB interface of LED drive board, be not necessarily to external power supply；Together
When, method proposed by the invention is to install module additional on existing asynchronous LED screen system, does not change the existing any hardware of system
Connection, therefore it can be readily applied to existing asynchronous LED display screen, reduce popularization difficulty；
(5) it can be used as Forewarning Terminal the invention enables existing a large amount of asynchronous LED screens to use, so that warning information covers
Range and crowd greatly expand；
(6) present invention will not generate any influence to the normal function of asynchronous LED screen, only strong when there is emergency news release
System display, and normal display is recovered immediately after emergency information revocation.,
Detailed description of the invention
Fig. 1 is the working principle diagram for the method that asynchronous LED provided in an embodiment of the present invention receives DAB emergency information.
In figure: 1, DAB radio frequency chip；2, demodulator chip；3, singlechip chip；4, memory chip (virtual USB disk)；5,
USB switch chip；6, USB disk；7, LED drive board；8, LED display.
Fig. 2 is the work flow diagram of asynchronous LED screen provided in an embodiment of the present invention.
Fig. 3 is the flow chart of the initialization procedure of virtual USB disk provided in an embodiment of the present invention.
Fig. 4 is the algorithm flow chart that the embodiment of the present invention provides that LED screen shows emergency information.
Fig. 5 is the flow chart of work methods in SCM program provided in an embodiment of the present invention.
Fig. 6 is the test pictorial diagram that the specific embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the method that asynchronous LED provided in an embodiment of the present invention receives DAB emergency information includes: DAB radio frequency
Chip 1；Demodulator chip 2；Singlechip chip 3；Memory chip (virtual USB disk) 4；USB switch chip 5；USB disk 6；LED
Driving plate 7；LED display 8.
Asynchronous LED screen described in virtual USB disk virtual USB disk DAB virtual USB disk virtual USB disk virtual USB disk receives DAB emergency information
System, receive emergency information workflow are as follows:
S101: in device of the present invention installation, necessary initialization, including setting LED are done to system operation first
Geographical location information, the DAB of screen receive frequency point, initialization of virtual USB flash disk etc.；
S102: installing in device and after the operation that is powered, and MCU passes through I2C, SPI according to the DAB frequency point information of setting
Interface configures DAB radio frequency chip and demodulation chip, realizes that the demodulation to DAB signal receives；
The demodulation of S103:DAB data is mainly completed by demodulation chip；After demodulation chip has demodulated a transmission frame, pass through
Interrupt signal notice MCU chip is read out；
After S104:MCU receives interruption, the solution adjusting data an of transmission frame is read out from demodulation chip；Since emergency is believed
Breath is transmitted in the fast traffic channel (FIC) of DAB, and MCU finds out FIC data from the solution adjusting data received, and
Further decoding；
S105:MCU identified from FIC data and further decodes emergency information according to agreement as defined in DAB standard, with
Detailed emergency information content is obtained, such as the type of emergency condition, Emergency Class, the region of emergency condition generation, guidance information
Deng.
Which kind of S106: no matter in the case of, as long as device is in energized state, the demodulation of DAB signal can all be carried out always；
S107: when DAB emergency information is not detected, MCU, which controls USB switch chip by programmable I/O, keeps its selection outer
The access (path A) of USB flash disk is set, therefore, the content that LED screen is shown is driven by external USB flash disk；At this point, being still logical for a user
Cross external USB flash disk and change LED screen and show content, usage mode with it is completely the same before not installing the present apparatus additional；
S108: once MCU detects that emergency information is converted into be driven by LED by emergency information, MCU from FIC data
The file of plate identification, this document is written in virtual USB disk, and controls that access of USB switch chip selection virtual USB disk
(path B), to force display in LED screen emergency information；
S109:MCU controls USB switch core slice weight after detecting emergency information revocation in FIC data, through programmable I/O
That access (path A) of external USB flash disk is newly selected, LED screen comes back to the normal mode of operation driven by external USB flash disk.
Further, the realization of LED screen location information and the initialization procedure of DAB frequency point information described in above-mentioned steps one
Method is such that
(1) geographic position data where LED screen is obtained by GPS receiver device；GPS position information can be used dedicated
GPS receiver, GPS navigator or mobile phone built in GPS receiver and obtain；
(2) the exploitation software provided using MCU manufacturer, using the programming interface of MCU, by the geographic position data of LED screen,
DAB is received built in the information such as frequency point write-in MCU in Flash；After MCU energization, corresponding address of the MCU program from built-in Flash
Middle these information of reading, and further according to these information configurations RF chip and demodulation chip；It should be noted that these information
The address of Flash built in MCU rearward should be written, conflict to avoid with the program space of MCU itself.
Further, the initialization procedure of virtual USB disk described in above-mentioned steps one is achieved in that
S201, physical space of one piece of continuous region as storage virtual USB disk, the region are divided in memory chip
First address correspond to 0 address of virtual USB disk；
S202, in MCU program, according to the interface of memory chip, establish the bottom layer driving library to the storage chip, packet
Include the basic operations such as reading and writing, the erasing to memory chip；
S203, on the basis of the bottom layer driving library of storage chip, utilize FAT16 the or FAT32 file operation generation of open source
Code establishes the file manipulation function library for being directed to the memory chip in MCU program；By these file manipulation function libraries,
What MCU can be convenient creates in memory chip, modifies or deletes file；
S204, the USB disk operating code using open source close above-mentioned file manipulation function library and USBStorage agreement
Connection, so that the memory chip can be identified as a USB disk unit by LED drive board.
Further, LED screen described in above-mentioned steps eight shows that the process of emergency information is achieved in that
(1) MCU, according to the definition of DAB standard, checks whether there is emergency information from the FIC data read；
(2) once detecting that emergency information, MCU do further decoding to emergency information, geographical location letter therein is obtained
Breath；If the geographical location information of emergency information and the geographical location information of LED screen mismatch, ignore the emergency information；Such as
The geographical location information of fruit emergency information and the geographical location information of LED screen match, then carry out subsequent operation；
(3) emergency information is converted into the file that can be identified by LED drive board by MCU, and this document is written to virtual USB disk
In；
(4) MCU controls the control signal of USB switch by programmable I/O, and the output for switching USB is changed to select virtual U
That access (path B) of disk；
(5) the D+ line of USB data line is pulled down to about 500 milliseconds of low level by programmable I/O by MCU, is then pulled up again
To high level；According to the definition of usb protocol, which will notify LED drive board (as usb host) that detection is connected to it again
USB device；
(6) LED drive board detects virtual USB disk, and automatic read wherein contains the file of emergency information, thus will emergency
Information is shown in LED screen.
Further, emergency information is converted to the file that can be identified by LED drive board, realization process is such that
Vegetarian refreshments is imaged in text conversion in emergency information by S301, the definition according to LED drive board to input data format
Battle array data；Since different LED screens and different LED drive boards are different to the definition of input data format, specific transfer algorithm
It needs the data format definition in conjunction with LED drive board and specifically treats；
S302, the definition according to LED drive board to input data format, by emergency type, the emergency etc. in emergency information
The information such as grade are converted into the pixel-matrix data of graphic form according to the icon of predefined；Likewise, due to different LED screens
Different with definition of the different LED drive boards to input data format, specific transfer algorithm needs the number in conjunction with LED drive board
It defines according to format and specifically treats；
S303, due to the type of asynchronous LED screen driving plate it is more, all transfer algorithms, which are all integrated in MCU program, is
It is unpractical；Feasible method is the transfer algorithm that the LED screen driving plate of several mainstreams is integrated in MCU program, and is being installed additional
When apparatus of the present invention, according to the type of LED screen driving plate, selection executes suitable algorithm；Meanwhile it is non-mainstream to being mounted with
The LED screen of LED drive board should be avoided and use it as Forewarning Terminal, or drive it the LED drive board that plate is changed to mainstream.
The method that DAB receiving module receives emergency information specifically includes:
S401, single-chip microcontroller configure DAB radio frequency chip and demodulation chip by SPI, I2C interface, complete the reception of DAB signal
And demodulation；
S402, single-chip microcontroller identify emergency information from solution adjusting data, and emergency information, which is converted to LED drive board, to be known
Other file, and virtual USB disk is written into file；
USB switch control signal is changed to selection path B by S403, single-chip microcontroller；
The D+ line of USB is pulled down 500 milliseconds by S404, single-chip microcontroller, and then pull-up notice LED drive board detects again is connected to
Its external USB flash disk；Path B is switched by USB and is selected, and file identification is simultaneously shown in the data generated in virtual USB disk；
After S405, cancellation warning, single-chip microcontroller changes USB switch control signal, and path A is reactivated, and LED screen is restored just
Normal state.
Combined with specific embodiments below, the validity of mentioned method of the invention is verified.
The present invention tests the small-sized DAB emission system progress in Chongqing Mail and Telephones Unvi, which includes one 5 watts of DAB
Transmitter and 6 asynchronous LED screens play two-way emergency information in transmitting terminal simultaneously.Fig. 6 shows that one of them is larger-size
The test result of LED screen reception EWM.Test result shows that 6 pieces of LED displays can correctly show warning message, and is alerting
Normal condition is returned after revocation.As needed for generating the extra time of virtual USB disk file and LED drive board forced to detect again
Time, be published to LED screen from warning information and show that the response time of warning information is about 0.6-1.5 seconds.
It is as follows to the supplementary explanation of the test result in the table:
(1) sensitivity in table, electric current are to utilize specific chip (DAB RF FC2501 chip, demodulation chip state
ID200 chip, single-chip microcontroller STM32F103 chip, memory chip IS62WV51216 chip, the USB switch of production are used
SGM7222 chip) realize above-mentioned function and the result that obtains.It such as uses other chips instead, can get difference or even more preferably result.
(2) program size and EMS memory occupation in table is the software to prove the technical feasibility and Preliminary Exploitation.User
It should be known that the size and memory consumption of the program can be reduced by special optimization design.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. the system that a kind of asynchronous LED screen receives DAB emergency information, which is characterized in that the asynchronous LED screen receives DAB emergency
The system of information includes: DAB radio frequency chip, DAB demodulator chip, singlechip chip, memory chip, USB switch chip, outer
Set USB flash disk, LED drive board, asynchronous LED display screen；
LED screen is selected to show that content is from USB disk or DAB receiving module by USB switch chip；
Under normal circumstances, in running background, the content that LED screen is shown obtains DAB receiving module from USB disk；Once DAB connects
It receives module and detects that emergency information, triggering USB switch chip force selection LED to show that content comes from DAB receiving module；
For the existing driving plate of compatible asynchronous LED screen, DAB receiving module uses virtual USB disk, and the emergency information received is converted
At a virtual USB disk, which is identified to show emergency information in LED screen by LED drive board.
2. the system that asynchronous LED screen as described in claim 1 receives DAB emergency information, which is characterized in that the DAB receives mould
Block includes: DAB radio frequency chip, DAB demodulator chip, singlechip chip, memory chip, USB switch chip.
3. the system that asynchronous LED screen as described in claim 1 receives DAB emergency information, which is characterized in that the memory chip
4 are initialized to generate virtual USB disk by scm software, and the content of virtual USB disk can also be repaired by scm software
Change.
4. the asynchronous LED for the system that asynchronous LED screen described in a kind of operation claim 1 receives DAB emergency information receives DAB emergency
The method of information, which is characterized in that the method that the asynchronous LED screen receives DAB emergency information: DAB receiver needs to judge LED
Whether screen position matches with the geographical location information for including in emergency information.
5. the method that asynchronous LED as claimed in claim 4 receives DAB emergency information, which is characterized in that the DAB receives mould
The method that block receives emergency information specifically includes:
Step 1: single-chip microcontroller configures DAB radio frequency chip and demodulation chip by SPI, I2C interface, complete DAB signal reception and
Demodulation；
Step 2: single-chip microcontroller identifies emergency information from solution adjusting data, and emergency information, which is converted to LED drive board, to be identified
File, and virtual USB disk is written into file；
Step 3: USB switch control signal is changed to selection path B by single-chip microcontroller；
Step 4: the D+ line of USB is pulled down 500 milliseconds by single-chip microcontroller, and then pull-up notice LED drive board detects again is connected to it
USB device；At this point, choosing since path B is switched by USB, the file in virtual USB disk is displayed in LED screen；
Step 5: after cancelling warning, single-chip microcontroller changes USB switch control signal, and path A is reactivated, and LED screen restores normal
State.
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| CN201910095988.7A CN109672460B (en) | 2019-01-31 | 2019-01-31 | System and method for receiving DAB emergency information by asynchronous LED screen |
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| CN201910095988.7A CN109672460B (en) | 2019-01-31 | 2019-01-31 | System and method for receiving DAB emergency information by asynchronous LED screen |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090257602A1 (en) * | 2008-04-09 | 2009-10-15 | Andrew Darby | Transmission device |
| CN201937600U (en) * | 2010-10-29 | 2011-08-17 | 深圳市华波美通信技术有限公司 | Pre-warning digital audio broadcasting (DAB) receiver |
| CN202077185U (en) * | 2011-05-25 | 2011-12-14 | 西安华运天成通讯科技有限公司 | Two-way interactive emergency communication terminal based on Beidou satellite |
| CN102868468A (en) * | 2012-10-23 | 2013-01-09 | 厦门四信通信科技有限公司 | Wireless pre-warning broadcasting system |
| CN202661827U (en) * | 2012-05-14 | 2013-01-09 | 盘锦辽河油田欧泰隆实业有限公司 | Well site HSE information early-warning publishing system |
| CN104852930A (en) * | 2015-06-11 | 2015-08-19 | 张迪 | Emergency communication equipment with function of information analysis and processing based on Beidou |
| CN105577304A (en) * | 2014-10-14 | 2016-05-11 | 张从辉 | DAB receiving terminal based on FPGA and DSP |
-
2019
- 2019-01-31 CN CN201910095988.7A patent/CN109672460B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090257602A1 (en) * | 2008-04-09 | 2009-10-15 | Andrew Darby | Transmission device |
| CN201937600U (en) * | 2010-10-29 | 2011-08-17 | 深圳市华波美通信技术有限公司 | Pre-warning digital audio broadcasting (DAB) receiver |
| CN202077185U (en) * | 2011-05-25 | 2011-12-14 | 西安华运天成通讯科技有限公司 | Two-way interactive emergency communication terminal based on Beidou satellite |
| CN202661827U (en) * | 2012-05-14 | 2013-01-09 | 盘锦辽河油田欧泰隆实业有限公司 | Well site HSE information early-warning publishing system |
| CN102868468A (en) * | 2012-10-23 | 2013-01-09 | 厦门四信通信科技有限公司 | Wireless pre-warning broadcasting system |
| CN105577304A (en) * | 2014-10-14 | 2016-05-11 | 张从辉 | DAB receiving terminal based on FPGA and DSP |
| CN104852930A (en) * | 2015-06-11 | 2015-08-19 | 张迪 | Emergency communication equipment with function of information analysis and processing based on Beidou |
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| CN109672460B (en) | 2021-05-14 |
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