CN2456417Y - Digital video mixer for highway and bridge toll system - Google Patents
Digital video mixer for highway and bridge toll system Download PDFInfo
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- CN2456417Y CN2456417Y CN00241185U CN00241185U CN2456417Y CN 2456417 Y CN2456417 Y CN 2456417Y CN 00241185 U CN00241185 U CN 00241185U CN 00241185 U CN00241185 U CN 00241185U CN 2456417 Y CN2456417 Y CN 2456417Y
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Abstract
The utility model relates to a digital video mixer for highway and bridge toll systems. The digital video mixer is composed of an input module, an output module, a character superposition module, a communication module and a control module circuit, wherein, the character superposition module is composed of a synchronous extraction circuit, a shadow generator, a character generator and a shadow depth regulating and character brightness regulating circuit; the synchronizing circuit is composed of synchronous chips; the shadow and character generators respectively comprise an analog switch circuit and a shadow and a character generation circuits. The utility model provides the digital video mixer; highway and bridge toll closed circuit television monitoring and statistical management systems communicate through the digital video mixer.
Description
The utility model relates to digital video mixing arrangement in a kind of digital video mixing arrangement, especially road, the bridge Fare Collection System.
Along with the develop rapidly of expressway construction, to also corresponding the having higher requirement of function of intelligent transportation highway three big systems (computer charge system, supervisory control system, communication system).Wherein, road toll system is being brought into play very important effect as the important means of highway recovery of the capital in intelligent transportation system.
At present, the general charge method that adopts of China is the semi-enclosed manual toll collection mode of " manual toll collection, detector check, closed-circuit television supervision, computer statistics management ".In the Fare Collection System of routine, close-circuit television,closed-circuft televishon and computer statistics management system are to disconnect mutually, from the video tape of closed-circuit television system, can't see the data messages such as toll amount of vehicular traffic, from the computer statistics form, also can't see vehicle, Che Qing of the amount of money correspondence of receiving etc.
The purpose of this utility model is: a kind of digital video mixing arrangement is provided, be digital video mixer (Video Digital Mixer, be called for short VDM), toll on the road and bridge's close-circuit television,closed-circuft televishon and computer statistics are managed two cover systems gets in touch by the digital video mixing arrangement, make it become the complete supervision and check mechanism of a cover, so that serve intelligent transportation system better.
The purpose of this utility model is achieved in that a kind of digital video mixing arrangement, and comprise input module, output module, character laminating module, communication module, control module circuit composition: wherein the input module circuit comprises 75 ohm of input impedance matching circuit and overvoltage crowbar; The output module circuit is then penetrated a grade follower by video amplifier circuit and two-way and is formed, and is provided with the video output of 75 ohm of two-way or multichannels; The communication module circuit adopts the ICL232 integrated chip; The control module circuit mainly is made of microprocessor, described character laminating module is by synchronous extraction, the shade generator, the character generator and the shade depth are regulated and the character brightness regulating circuit is formed: synchronous circuit is made of synchronizing chip, shade, character generator comprises analog switching circuit, shade, character produces circuit, the two-way input of first analog switch is respectively the vision signal without decay and the decay of process potentiometer, control by shade control logic circuit (being the shade generator), output image has shade, and it is again simultaneously one tunnel input of second path analoging switch; Other one tunnel of second path analoging switch is input as the adjustable direct current signal of level, and switch is controlled by character control logic circuit (being character generator), thereby makes output image be superimposed with character.
Further improvement of the utility model is: other is provided with the hardware watchdog circuit, adopts monitoring device able to programme, to improve anti-interference, the anti-deadlock performance of system;
Characteristics of the present utility model are: the character laminating module then is the core of VDM equipment, this equipment is linked in the closed-circuit television system, and from computer management system, receive the data of charge situation at any time, dynamically be inserted in the video pictures that has vehicle image, like this, information such as vehicle, vehicle condition, charge situation, operator's job number, track just come into plain view in supervisory control system; Along with charge operator's button operation dynamic refresh, just finished combining of video in data in the computer management system and the video monitoring system, thereby reached the needs of supervision and check.The utility model can show information such as letter, numeral and Chinese character simultaneously, has advantages such as features simple structure, reliable in function be flexible, with low cost, can be widely used in the various TV monitor systems.Order overlaying character data message on inputted video image that the utility model sends according to computer, and a transparent shade of rectangle is set selectively, thereby design a kind of new digital video blender to satisfy the highway tolling system requirement, expansion is also improved charge station's system information demonstration, forms a kind of good charge station supervision verification mechanism.
The utility model is described in further detail below in conjunction with accompanying drawing and by embodiment:
Fig. 1 is exterior I of the present utility model/O structured flowchart
Fig. 2 is the utility model structured flowchart
Fig. 3 is the utility model input module circuit diagram
Fig. 4 is the utility model output module circuit diagram
Fig. 5 is the utility model communicating circuit figure
Fig. 6 is the utility model synchronous extraction circuit figure
Fig. 7 is the utility model analog switching circuit figure
Fig. 8 is the utility model point pierce circuit figure
The utility model is applied to the video superimpose technology in the monitoring, charge computer management system of highway and bridge.Digital video apparatus mainly at intelligent transportation system (ITS) design, guarantee that overlapped information is high-visible under the high brightness background condition, and assurance equipment long-term stability under the on-the-spot bad working environment of highway is moved reliably.Mainly comprise following circuit:
1. single-chip microcomputer control technology and compunication circuit
This technology makes equipment directly carry out data communication with the COM port of computer, is convenient to realize man-machine interaction, finishes multiple function as required.Overlapped information and stack opportunity receive control command, the realization of control character overlaying function by computer control, the serial port that must utilize the MCS51 series monolithic and serial communication function, realization and computer RS232 port communications function from computer.
2. transparent shade circuit
For realizing anti-high light function, character shows the allotment of employing foreground/background, the prospect character is highlighted white, the character background is the translucent transparent shade of rectangle that is provided with in the character viewing area one by one, so both can prevent daytime road reflection daylight and car light dazzle at night to the influence of overlaying character brightness and definition, guarantee under the high brightness background, to see clearly the character overlapped information; Can not influence the identification of background image again.The depth of shade is adjustable continuously according to background image brightness.
3.Watch Dog Timer circuit
In order to ensure equipment under the on-the-spot abominable noise jamming environment of highway, can be for a long time normally, work reliably, specialized designs the hardware watchdog circuit.House dog is constantly waken it up when running software, in case the deadlock situation that generation causes because of interference, house dog automatically resets, thereby reaches anti-interference, the anti-effect that crashes.
4. based on the communication protocol of ITS
Special communication protocol is formulated in the application of the digital video of combining closely mixing apparatus in intelligent transportation system (ITS), is very suitable for occasions such as toll on the road and bridge, bayonet socket monitoring.
The external interface of VDM equipment, from the outside, VDM equipment can be described as shown in Figure 2:
As seen from the figure, from the original video of video camera with from the character information of computer, after the VDM device processes, output image is the vision signal of the character information that superposeed.
Each VDM device interior has two just the same and circuit boards independently mutually; Each piece plank all has a video inputs mouth, two video-out ports, and therefore, whole VDM equipment has two video inputs, four video output terminals.Because principle is identical, this paper only gets a circuit board as research object, the deployment analysis discussion.
As shown in Figure 1, VDM equipment roughly can be divided into input module, output module, character laminating module, communication module, control module and hardware watchdog six major parts.Wherein input module mainly is to realize 75 ohm of input impedance matching and overvoltage protection; Output module is then penetrated a grade follower by video amplifier circuit and two-way and is formed, and can drive the video output of 75 ohm of two-way; Communication module adopts the ICL232 integrated chip to realize the conversion of logic level, can by serial port directly and computer communicate; Control module mainly is the AT89C52 single-chip microcomputer, by the controlled function of its realization to whole system; Hardware watchdog adopts X25045 monitoring device able to programme, to improve anti-interference, the anti-deadlock performance of system; The character laminating module then is the core of VDM equipment.
According to the block diagram of VDM equipment, analyze the operation principle of each module successively below.
As shown in Figure 3, input module mainly is that the vision signal of input is carried out 75 ohm of input impedance matching, and realizes isolating and the overvoltage protection effect.Through 9014 penetrate the level follow after, vision signal is transmitted to the character laminating module.The circuit diagram that it is concrete.
As shown in Figure 4, output module mainly is level is amplified, penetrated to the vision signal after the character stack follow, and is divided into two-way, drives the video output (1Vp-p) of 75 ohm of two-way respectively.
The circuit diagram that it is concrete.
As shown in Figure 5, communication module is the bridge between computer and the VDM.It adopts the ICL232 chip, realizes logic level transition, and relevant display command and character information are sent to the character laminating module.Referring to its concrete circuit diagram,
Shown in Figure 5, in the control module circuit diagram,
The core devices of VDM control module is the AT89C52 single-chip microcomputer.Adopt the master controller spare of AT89C52 single-chip microcomputer as VDM:
AT89C52 has three Timer, a full duplex asynchronous communications serial interface, can select one
Individual Timer is as the serial port Baud rate generator, so just can realize with computer easily
Communication function;
AT89C52 has the internal RAM of 256 bytes, satisfies the requirement of the data processing amount of VDM; It also has
The E2PROM of 8K byte can deposit in chip internal with whole programs and character library, and can programme repeatedly,
And simple to operate, be convenient to the exploitation debugging;
Have four 8 parallel-by-bit mouths, I/O mouth aboundresources;
Six interrupt vectors are arranged, allow eight interrupt sources.
Adopt the PL/M-51 high-level programming language that AT89C52 is programmed among the VDM.Character laminating module circuit comprises Fig. 6-7
The character laminating module is the core of VDM equipment.The character laminating module is mainly by synchronous extraction as can be known by theory diagram, and shade generator, character generator and adjusting of the shade depth and character brightness regulation etc. are partly formed.
Fig. 6 extracts among the figure synchronously
In order to satisfy the accuracy of shade and character locating, the field synchronization and the row that need to extract in the vision signal are synchronous.Extract the part physical circuit as shown in Figure 6 synchronously.It adopts Sync Separator Chip LM1881, from vision signal row synchronously and field synchronization separate and offer AT89C52, shade generator and character generator.
Shade generator and character generator
Analog switch is the Primary Component that produces shade and character, and VDM has adopted two-way analog switch CD4053.As shown in Figure 7: the two-way input of first analog switch is respectively the vision signal without decay and the decay of process potentiometer, control by shade control logic circuit (being the shade generator), output image has shade, and it is again simultaneously one tunnel input of second path analoging switch; Other one tunnel of second path analoging switch is input as the adjustable direct current signal of level, and switch is controlled by character control logic circuit (being character generator), thereby makes output image be superimposed with character.
1〉shade produces partly and is combined by programmable logic chip ATF16V8B, counter chip 74HC4040, two monostable trigger 74LS221 (U24, U1), NAND gate 74HC00, and its output signal is as the first via of control two-way analog switch CD4053.
Two monostable trigger 74LS221 and electric capacity, potentiometer are formed delay circuit.This delay circuit is synchronous to row, field synchronization is handled, and forms the rectangle shade on screen.
The pulsewidth Tw of 74LS221 output pulse is by the value decision of external R, C, and computing formula is:
Tw=R·C
Capacitor C is taken as definite value, and resistance R adopts potentiometer, can change the pulsewidth of the output pulse of 74LS221 within the specific limits, thereby changes the delay value to row, field sync signal, realize to about shade, the character, the adjustment of position, the left and right sides.
Transparent shade generation circuit: in fact the rectangle shade is exactly the vision signal through overdamping, and its brightness is dark partially, but background image can discern fully, and promptly the rectangle shade is transparent.Adopting transparent shade technology is necessary in ITS, can adapt to background luminance complicated and changeable like this, is convenient to the identification of background image and overlapped information.
The numeral row selects circuit engineering: GAL device ATF16V8B (U13) and counter 74HC4040 (U10) to combine, row is counted synchronously, and judge it is to show delegation or two row (it is synchronous to be equivalent to 25 or 50 row), thereby realize that the numeral row selects function.Adopting the advantage of numeral row selecting technology is to guarantee the steady display of shade, character, can not shake up and down.
Physical circuit is asked for an interview the U1 on the schematic diagram, U10, U13, parts such as U24.
2〉generation of character
The generation of character needs a some oscillator, and it is the cycle with the time width of single pixel, is combined by 74HC14 and L, C, R, as shown in Figure 8.U13 realizes that the numeral row selects function, and is by the starting of oscillation time of switching circuit control point oscillator, in full accord to guarantee the original position of overlapped information on screen.
74HC14 is the inverter that has Schmidt trigger, when output end vo is high level, by R3, L1, C2 loop capacitor C 2 is charged, when C2 goes up voltage Vc greater than forward threshold voltage V
IT+The time, Vo becomes low level, makes C2 go up voltage Vc and reduce that Vc is less than negative sense threshold voltage V
IT-The time, output becomes high level once more, so repeatedly, has produced waveform.
The DOTEN of ATF16V8B (U13) (16 pin) is the oscillator control end, and when DOTEN was high level, switch transistor T 5 was ended, some oscillator operate as normal; When DOTEN is low level, switch transistor T 5 saturation conductions, the some blocking of oscillator.
3〉read-write of character information
The displayable character words stock of VDM is placed among the E2PROM of AT89C52 inside, and AT89C52 writes lattice information among the display chip RAM6116 after receiving display command.Character pattern information is that unit is placed in 6116 with BYTE, delivers to 6116 address input end from the count value that the address value sum counter 4040 of MCS51 series CPU produces behind the 74HC157 gating.74HC157 selects the address value sent here by single-chip microcomputer and data is write in 6116 when writing state; 74HC157 gated counter count value is in the address input 6116 when read states, and the data that read out are produced character superposing control signal through GAL chip ATF16V8B again, removes to control analog switch by this signal, finally reaches the effect of character stack.
Here, the clock signal of two counters 4040 and reseting logic are vital.Wherein first is 4040 as the octal representation device, and its spill over has so just been realized the one-to-one relationship from stack pixel (BIT) to memory cell (BYTE) as another clock of 4040 input.Because delegation will show 256 pixels (promptly 16 dot matrix are 16 * 16 Chinese character width), when octal representation device meter completely 256 time, the octal representation device should be resetted, simultaneously its input clock is shielded, until showing next line.Therefore, how counter reset signal, input clock form, not only with row synchronously, field synchronization is closely related, and must consider count value, their logical relation is realized by three GAL chips.Wherein U3 mainly to the address value decoding of AT89C52, removes gating RAM6116, and is responsible for providing a reset signal by 256 o'clock in each line character pixel counts.U13 realizes that the numeral row selects function, and by starting of oscillation time of switching circuit control point oscillator, in full accord to guarantee the original position of overlapped information on screen.
Memory cell in the display random access memory 6116 (is unit with BIT) be with video image on the rectangular area in pixel one to one, the read-write to 6116 then is unit with BYTE.This conversion when character display, is realized by GAL chip ATF16V8B (U14); Writing at 6116 o'clock, CPU finishes by software control MCS51 series.
The shade depth is regulated and the character brightness regulation
The shade depth is regulated and the character brightness regulation is realized by potentiometer.Circuit as shown in Figure 7, the shade depth regulate to be to select the amplitude of the vision signal that is attenuated on the section to realize by being controlled at first via analog switch; The character brightness regulation is to select the amplitude of the direct current signal on the section to realize by being controlled at second path analoging switch.
The X25045 hardware watchdog
Because VDM is mainly used in the intelligent transportation system (ITS), necessary assurance equipment can steady in a long-term, operation reliably under the on-the-spot bad working environment of highway.For this reason, need the special watchdog circuit of design, to improve anti-interference, the anti-deadlock performance of system.
X25045 is three kinds of functions commonly used: WatchDog Timer, voltage monitoring, E
2PROM is combined within the encapsulation, thereby has reduced system cost and reduced requirement to circuit board space.
WatchDog Timer provides the independent protection system to microprocessor.In the system work process, timing property ground sends the ResetWatchDog order to X25045, if system breaks down, then program richochet, ResetWatchDog is not performed, and at optional time out period (timeoutinterval) afterwards, X25045 will make response with the Reset signal.The user can select this cycle from three values that preset (representative value is 0.2s, 0.6s, 1.4s), in case selected, even after power cycle changes, this cycle does not change yet.
Utilize X25045 to hang down the Vcc testing circuit, can protection system avoid the influence of low voltage conditions.When Vcc drops to minimum Vcc transfer point when following, system reset.Reset and remain to Vcc always and rise to minimum Vcc and detect till the above 200ms of level.
The memory of X25045 partly is the 4096 Bits Serial E2PROM of CMOS, organizes according to 512 * 8, and it has and allows the serial peripheral of simple three-way bus work to connect (SerialPerpheral Interface) and software protocol.
X25045 has utilized the proprietary Direct Write of Xicor company
TMWafer, it is the useful life (endurane) of 100,000 cycles/byte and the data retention period that minimum is 100 years that minimum is provided.
The utility model main performance feature
On charge station's supervisory control system vision signal superposition car Taoist monastic name, operator's job number, vehicle,
Information such as inlet, Che Qing.
The content and the opportunity of overlaying character are controlled by serial port by computer.
Have the high light inhibit feature, clear to guarantee the information that under strong background light, superposes
As seen clear.
Has anti-deadlock function.
The key technical indexes
Defeated 1Vp-p 75 Ω
Output 1Vp-p 75 Ω
Bandwidth 6MHz
Gain 0dB
Differential gain DG＜2%
Differential phase DP＜2%
0-0.7V is adjustable for the overlaying character level
0-0.7V is adjustable in transparent background brightness
Claims (2)
1, the digital video mixing arrangement in road, the bridge Fare Collection System, comprise input module, output module, character laminating module, communication module, control module circuit composition: wherein the input module circuit comprises 75 ohm of input impedance matching circuit and overvoltage crowbar; The output module circuit is then penetrated a grade follower by video amplifier circuit and two-way and is formed, and is provided with the video output of 75 ohm of two-way or multichannels; The communication module circuit adopts the ICL232 integrated chip; The control module circuit mainly is made of microprocessor, described character laminating module is by synchronous extraction, the shade generator, the character generator and the shade depth are regulated and the character brightness regulating circuit is formed: synchronous circuit is made of synchronizing chip, shade, character generator comprises analog switching circuit, shade, character produces circuit, the two-way input of first analog switch is respectively the vision signal without decay and the decay of process potentiometer, control by shade control logic circuit (being the shade generator), output image has shade, and it is again simultaneously one tunnel input of second path analoging switch; Other one tunnel of second path analoging switch is input as the adjustable direct current signal of level, and switch is controlled by character control logic circuit (being character generator), thereby makes output image be superimposed with character.
2,, it is characterized in that being provided with in addition the hardware watchdog circuit that adopts monitoring device able to programme by the digital video mixing arrangement in the described road of claim 1, the bridge Fare Collection System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00241185U CN2456417Y (en) | 2000-11-29 | 2000-11-29 | Digital video mixer for highway and bridge toll system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00241185U CN2456417Y (en) | 2000-11-29 | 2000-11-29 | Digital video mixer for highway and bridge toll system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2456417Y true CN2456417Y (en) | 2001-10-24 |
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ID=33601705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00241185U Expired - Fee Related CN2456417Y (en) | 2000-11-29 | 2000-11-29 | Digital video mixer for highway and bridge toll system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2456417Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1969550B (en) * | 2004-06-15 | 2010-05-05 | 三星电子株式会社 | System for displaying character and a method thereof |
| CN105072361A (en) * | 2015-08-20 | 2015-11-18 | 河北上元工控技术有限公司 | Video character superposition circuit and electronic device |
| WO2018209824A1 (en) * | 2017-05-17 | 2018-11-22 | 威创集团股份有限公司 | Video character superimposition method and system |
-
2000
- 2000-11-29 CN CN00241185U patent/CN2456417Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1969550B (en) * | 2004-06-15 | 2010-05-05 | 三星电子株式会社 | System for displaying character and a method thereof |
| CN105072361A (en) * | 2015-08-20 | 2015-11-18 | 河北上元工控技术有限公司 | Video character superposition circuit and electronic device |
| WO2018209824A1 (en) * | 2017-05-17 | 2018-11-22 | 威创集团股份有限公司 | Video character superimposition method and system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |