CN1334949A

CN1334949A - Concurrent display and data communicating system and method using LEDs

Info

Publication number: CN1334949A
Application number: CN99811843A
Authority: CN
Inventors: G·K·H·庞; E·S·杨; C·S·K·杨; M·K·M·洪; D·杨; H·S·刘; T·O·关; M·H·高; C·H·陈
Original assignee: Versitech Ltd
Current assignee: Versitech Ltd
Priority date: 1998-03-20
Filing date: 1999-03-19
Publication date: 2002-02-06
Also published as: EP1072026A4; HK1044061A1; WO1999049435A1; JP2002527917A; EP1072026A1

Abstract

A concurrent signalling and data communication system based on the modulation and encoding of digital information using the visible light emitted by light emitting diodes (LEDs) is provided. A general-purpose system includes a transmitter and receiver circuit coupled to respective computer system. The transmitter is further coupled to an LED beacon, LED dot matrix display, or other configuration of LEDs that can be used for simultaneous display and data communication. The computer (10)coupled to the transmitter is used to control the data communication function of the LEDs, and also may be used to control the display function. A separate computer may also be used to control the display function distinct from the data communication function. The computer (12) coupled to the receiver interprets the data communicated over the optical link between the transmitter and receiver, and may display this information to a user of the system. Two transmitter and receiver designs are provided, one for a non-multi-tasking environment, and the other design for a multi-tasking environment. Several applications of the general-purpose system are provided, including a vehicle seed limiting application, a vehicle location and guidance system application, and a portable traveler information and location system application.

Description

Use the concurrent demonstration of light emitting diode and data communications system and method

The application requires in 1 year applying date of the application the right of priority-U.S.'s sequence number 60/078,686 in four provisional application of U. S. application; 60/078,684; 60/082,626; And 60/078,691.

The application relates to LED display system and data communication field.Specifically, the invention provides concurrent demonstration and data communication system and the method for a kind of LED of use as concurrent demonstration and data communication parts.The present invention also provides the concurrent demonstration of being invented and the multiple application of data communication system.

The invention provides a kind of based on use by the modulation of the numerical information of one or more light emitting diodes (LED) visible light emitted and coding and signaling and data communication system.General-purpose system according to the present invention comprises the transmitter and receiver circuit that is coupled to each computer system.Transmitter also is coupled to the LED beacon, the LED matrix display, or can be used for showing simultaneously that other LED with data communication disposes.The computing machine that is coupled to transmitter is used to control the data communication function of LED, and is used for the Presentation Function of control system.A separate computer can alternatively be used to control the Presentation Function different with data communication function.Be coupled to the data of the optical link communication of computer interpretation between transmitter and receiver of receiver, and this information can be shown to the user of system.Two transmitter and receiver designs are provided, and one is used for non-multitask distribution environments, and another is designed for the multitask distribution environments.Several application of this general-purpose system are provided, comprise that the speed of a motor vehicle limit to use, vehicle location and guidance system are used, and portable traveler's tip and position system are used.

In addition, this general-purpose system is included in the one or more executable computer programs that move on the one or more computing machines that are coupled to the LED transmitter.These executable computer programs are provided for the software control of the data-transformation facility of system, and also are provided for the LED beacon or show the character that dot matrix shows, the demonstration control of decorative mode or message.Receiver comprises that one is used for the lens combination from light focusing to a photoelectric detector of LED.Use the executable computer program in suitable electron device and the receiving computer, demodulation from the information of the light emission of LED so that the emission data to be provided.Open a segment distance location receiver with the LED branch, and it is designed to separate light modulation emission data and follows the Computer Storage or the code displaying message of being correlated with.For eliminating, make by the frequency of transmitter on/off LED enough high so that the light of being launched by LED appears as constant illumination concerning human eye by the flicker in the caused LEDs of modulated data signal.

According to instruction of the present invention, except that its conventional func as indication and light fixture, can be with the communication facilities of LED with the transmission and the broadcasting that act on information and data.Therefore, LED shows that (or illumination) parts become open space, the part of radio optical communication system.

Go up in one aspect, the invention provides a kind of new short range beacon and communicate by letter to the roadside with support unit.Provide wherein this data to transmit the most favourable a lot of application.For example, traffic lights can be made of the LED with concurrent data-transformation facility of the present invention (and Presentation Function).The driver uses receiver to obtain the message from traffic lights.These message can comprise such as street name, speed limit, road conditions, or the position and the current transport information of the position of nearest hospital or refuelling station and so on.Perhaps the driver can check his Email by optical data link.Other application comprises from a computing machine to another computing machine, and perhaps the file of portable bidirectional transfer of information and receiving system transmits.Use such bilateral system, a student can use his/her notebook his/her shop problem to be downloaded to the counselor's who is positioned at the front portion, classroom computing machine by an optical data link.

According to another aspect of the present invention, one and signaling and data communication system are provided, comprise a data presentation and communication system, a data receiving system, and the one or more LED that are coupled to data presentation and communication system, a LED visible shows signal of emission and a modulating data signal of communication, thus operate as concurrent parts.

Another aspect of the present invention provides a speed of a motor vehicle to limit system, comprise concurrent demonstration and the data communication parts of a while as visual display unit (VDU) and the operation of data communication parts, wherein the data that sent by concurrent demonstration and data communication parts are that the speed of a motor vehicle limits data and one and is used for receiving the speed of a motor vehicle qualification data that sent and being used to handle data processing receiver in the automobile of the data that received from concurrent demonstration and data communication parts.

Another aspect of the present invention provides an automobile position and guidance system.This system comprises concurrent demonstration and the data communication parts of a while as visual display unit (VDU) and the operation of data communication parts, wherein the data that sent by concurrent demonstration and data communication parts comprise position and director information, with one be used for receiving position and the director information that is sent and being used to handle data processing receiver in the automobile of the data that received from concurrent demonstration and data communication parts, this receiver comprises a CPU (central processing unit), a visible light receiver module, and a locating module.

Another aspect of the present invention provides a kind of portable travel information and position system.This system comprises that a while is used to receive the data that sent by concurrent demonstration and data communication parts as the concurrent demonstration of visual display unit (VDU) and data communication parts operation and data communication parts and one and with the portable travel information system of this data presentation to the user of portable travel information system.

Should be noted that these only are some aspects in a lot of aspects of the present invention.To become apparent by reading the not specific others of listing of the detailed description of stating below.

Compare with current known data communication system and the invention provides lot of advantages.Is not to have these all advantages simultaneously implementing claims described when of the present invention, below listed only be to provide, the explanation of advantage type independent or combination.These advantages comprise: the demonstration of (1) concurrent operations LED beacon or other type is with the pattern of the pilot lamp that shows some operating conditions simultaneously and the ability that also sends modulating digital data; (2) provide receiver/transmitter circuitry of two types, a kind ofly be used for non-multitask distribution environments, another kind is used for the multitask distribution environments; (3) optical link between the transmitter and receiver of the present invention is in current not by the electromagnetic spectrum part of FCC or other similar management organization management; (4) lack the range operation; (5) low cost; And (6) are easy to scheduling.

As described in detail according to preferred embodiment, these only are some advantages in the lot of advantages of the present invention.As can recognizing, the present invention can be other and with the different embodiment of the following specific embodiment that lists, and its details can make amendment in all fields, all these does not break away from the present invention.Therefore, the accompanying drawing of preferred embodiment and description only are considered to schematically, and do not have limited.

Fig. 1 is that a LED light beacon used according to the invention is as the general concurrent demonstration of concurrent parts and the synoptic diagram of data communication system;

Fig. 2 is that a LED dot matrix used according to the invention shows as the general concurrent demonstration of concurrent parts and the synoptic diagram of data communication system;

Fig. 3 lists the representative communication agreement that is used for a Frame of the present invention;

Fig. 4 is the block scheme that is used for the digit preference data transmitter of concurrent demonstration of the present invention and data communication system;

Fig. 5 is the block scheme that is used for the digit preference data receiver of concurrent demonstration of the present invention and data communication system;

Fig. 6 is the block scheme that is used for the replacement digital data transmitter with a memory buffer unit of concurrent demonstration of the present invention and data communication system;

Fig. 7 is the synoptic diagram of the operating conditions relevant with the replacement digital data transmitter among Fig. 6, and wherein included serial input-output apparatus read time is lower than the PC that is coupled to data transmitter;

Fig. 8 is the synoptic diagram of the operating conditions relevant with the replacement digital data transmitter among Fig. 6, and wherein included serial input-output apparatus read time is higher than the PC that is coupled to data transmitter;

Fig. 9 is the block scheme that is used for the replacement digital data receiver with a memory buffer unit of concurrent demonstration of the present invention and data communication system;

Figure 10 is the synoptic diagram of the operating conditions relevant with the replacement digital data receiver among Fig. 9, does not wherein receive idle bytes;

Figure 11 is the synoptic diagram of the operating conditions relevant with the replacement digital data receiver among Fig. 9, wherein receives idle bytes between frame;

Figure 12 is the timing diagram of the source of error in the interpreted frame;

Figure 13 is used for traffic lights with LED, the street lamp, and the of the present invention concurrent demonstration of message display board or road sign and the speed of a motor vehicle of data communication system limit the figure that uses;

Figure 14 is the figure of the visible light LED transmitter relevant with application shown in Figure 13;

Figure 15 limits the block scheme of using relevant Che Nei system shown in the application with the speed of a motor vehicle of Figure 13;

Figure 16 is the block scheme of the VISIBLE LIGHT EMISSION machine module relevant with Che Nei system shown in Figure 15;

Figure 17 is used for traffic lights with LED, street lamp, the of the present invention concurrent demonstration of message display board or road sign and the bus location of data communication system and the figure of guidance system;

Figure 18 is the block scheme of the inertial positioning module relevant with system applies shown in Figure 17;

Figure 19 is used for traffic lights with LED, street lamp, the figure of the portable travel information system of the of the present invention concurrent demonstration of message display board or road sign and data communication system;

Figure 20 is the block scheme of a preferred portable travel information and position units; With

Figure 21 is the synoptic diagram that is used for the typical user interface of portable travel information shown in Figure 21 and position units.

1. use concurrent demonstration and the data communication system of LED

Get back to accompanying drawing now, Fig. 1 lists a LED light beacon 14B used according to the invention as the general concurrent demonstration of concurrent parts and the synoptic diagram of data communication system.The general application that this part of the present invention has been described system of the present invention according to communication between two computer systems using at the optical channel (or link) of single worker's pattern (that is, one-way data transmits) operation and signaling.Two designs (design one and design two) that the present invention are used for digital data transmitter and digital data receiver are also disclosed in addition in this section.Below in conjunction with Fig. 4,5,6 and 9 discuss these designs.The discussion that relates to digital communication below also comprises: (i) bit error rate; (ii) design of protocol; And encoding scheme.

Fig. 1 illustrates data communication and the signaling between two computing machines 10,12 that use LED beacon light 14B.In transmitter one side, computing machine 10 is coupled to LED beacon light 14B by transmitter circuitry 14A through parallel port 18, and parallel port 18 is general relevant with computing machine 10.Describe the embodiment of transmitter circuitry 14A below in detail.In addition, executable computer program of computing machine 10 operation, this program is used to format and control the data transmission through optical link.One or more LED 14B can be used for launching light signal, and LED 14B is current as visual signaling equipment and data communication parts operation (that is, the light by the LEDs14B emission plays signaling gear and data communication mechanism).In receiver one side, preferably have one or more and receiver circuit 16, and to the relevant photoelectric detector of the parallel interface 18 of another computing machine 12, computing machine 12 may be a PC, workstation, notes computing machine, or flush bonding processor.Be coupled to the suitable lenticular unit that is used for the visible light from beacon light 14B is focused on a relevant photoelectric detector or other photodetector that also has of receiver (although not shown).Be transmitted into the preferably formatted a plurality of Frames of data traffic signals of receiver 16 from LED transmitter 14B, and can be unpacked and demonstration on computers for receiving by computing machine 12.

Fig. 2 is to use the LED dot matrix to show 22 synoptic diagram according to general concurrent demonstration of the present invention and data communication system as concurrent parts.This LED display panel 22 is used for providing the visible message signal with the form of the concurrent demonstration of information, and data transmission.The transmission equipment side of this system comprises two computing machine 10A, 10B.A data communication function that is used to control concurrent LED demonstration 22 among the computing machine 10A, and the information display function of another computing machine 10B control LED dot matrix 22.These computing machines 10A, 10B is coupled to LED dot matrix 22 by a suitable interface circuit 20, this interface circuit 20 can comprise a transmitter circuitry (similar with the embodiment of 14A among Fig. 1 and the 14A that discusses below), and can comprise the circuit of the Presentation Function that is used to control dot matrix 22.As a kind of replacement, replace the computing machine 10A that is used to control dot matrix 22,10B can only use a computing machine by two functions of interface circuit 20 management.An executable computer program operates on these two computing machines, and computing machine is used to control the data presented communication function and another computing machine is used for the character on the display panel 22, the visual display control of decorative mode or message.

Usually, there is two types the operating system that is used for IBM-compatible personal computer (PC), as illustrated in fig. 1 and 2: DOS, Windows.DOS OS is the operating system of old type that is used for PC.It is characterized in that its single task (that is, non--multitask distributes), the environment of command driven, DOS OS is used for the compatible PC of all IBM-before the Windows 3.1 or 95 that Microsoft introduces.First kind of design of data transmitter shown in the Figure 4 and 5 and receiver (no memory buffer unit) (design one, below) be the transmitter and receiver version that is used for non--multitask distribution environments.Under Windows 95 environment, OS has accidental interruption to all working procedures, just looks like that to be in the multitask distribution environments the same.These interruptions will influence data transmission procedure and may lose some data.Under the DOS environment, there is not such problem.Therefore, the decision design of the digital data transmitter of Figure 4 and 5 and receiver can not be used for the Windows95 environment and provide another version shown in Fig. 6 and 9 (design two) to be used for the multitask distribution environments.This second design is based on memory buffer unit appended to interface circuit.

Get back to discuss be used for two designs of data transmitter (14 or 22) and receiver (16) before, consider that several data communication of the present invention aspect is useful, comprising: (i) bit error rate; (ii) design of protocol; (iii) encoding scheme.

A. the bit error rate (BER)

The inventor has set up the test of the bit error rate (" BER ") of the described data general-purpose communication system of the application.Such as frame size, data transfer rate, lighting environment, distance, and the bit pattern of Frame and so on factor is changed, so that the BERs under the different condition takes on a different character.Use the direct sight line between the transmitter and receiver to set up this test.These factors change as follows: (1) oscillator frequency: 62.5kbps/125kbps/250kbps/500kbps; (2) environment: normal/dark/interference; (3) distance: 2.5ft/3ft; (4) signal mode: 0101.../0011...; And (5) frame size: 1kbyte/2kbyte/5kbyte.

Help above-mentioned test with the C Plus Plus written program.This program can write down and comprise average error rate, the various combinations of the condition of the maximum error code in the frame and the distribution of error code.Each test can be used the transmission of 1,000,000 data.Can use the combination of all conditions, and this test can be repeated repeatedly with the bit rate of being less than or equal to 500kbps.This test makes BER so low so that it can not be by the current experiments testing equipment.Like this, BER of the present invention is considered to acceptable.

B. design of protocol

Fig. 3 illustrates the example of a communication protocol that is applicable to the data transmission on the optical link shown in the Fig. 1 and 2 between transmitter (14 or 22) and the receiver (16), use this agreement, be converted into one group of Frame 30 from the digital data stream of transmitted from transmitter to receiver communication.Each frame 30 preferably is made up of 1024 bytes, although can use other frame size.A preferred frames, have 48 data blocks, each data block 20 byte.The increase that begins in each data block 36 begins byte 34 (" Stx ").In addition, increase sync byte 32 (" Sync ") in 30 beginnings of each frame with when finishing, have two idle bytes 38 in the end of frame.

The byte number that is used for Sync32 generally should be longer than a data block 36, even therefore 18 byte data pieces 36 have the pattern that equals Sync byte 32 just, receiver still can be distinguished them.The function of Stx byte 34 is indicated number beginnings according to piece 36, and allows Sync byte 32 and data byte 36 to be distinguished.In operation, the number of receiver counting Sync byte 32.If the number of the Sync byte 32 that receives is greater than a determined value (for example, greater than 25), this value is greater than the size of data block 36, and then receiver can be known the beginning that it is in a frame or the end of a frame.32 bytes are assigned to are in the Sync byte 32 that frame begins, and 30 bytes that are in end, so that provide some surplus of counting Sync byte number.

When finishing, increase by two idle bytes 38 to separate frame 30.These idle bytes 38 also are used for the timing between synchro transmitter (14 or 22) and the receiver 16.When not sending data, send idle bytes 38 continuously from transmitter (14 or 22).

In the beginning of data transmission, receiver 16 will receive idle bytes 38, and this idle bytes also is used for synchronously.When receiving Sync byte 32, receiver 16 will stop synchronizing process and count Sync byte 32.Determine amount (for example, 25) if the number of Sync byte 32 reaches one, then receiver is handled following byte as data block 36.Receiver 16 is followed reset counter and is counted the number of Sync byte 32 once more.Determine amount (for example, 25) if the number of Sync byte 32 reaches one, then receiver 16 will know that it is in the end of frame 30, and then use idle bytes 38 to be used for system synchronization once more.

Although should be noted that at Fig. 3 and described a certain protocol, this just can be used for an example in polytype format of the present invention and the framingization.

C. encoding scheme

Human eye is very responsive for light intensity.Preferred light link between the described transmitter and receiver of the application, digital data communication is handled the light intensity that should not influence LEDs, otherwise flicker will appear in the procedure for displaying of LEDs.Therefore, provide a kind of encoding scheme that is used for during normal data communication, keeping constant light intensity.This optimized encoding scheme is to use the Manchester coding.At the Manchester coding, a data bit is two data bits by map.For example, data " 0 " are " 01 " with rising edge by map, and data " 1 " are " 10 " with negative edge by map.

Use the Manchester coding to have three advantages.At first, it is easy to realize.The second, it provides an additional timing signal from transmitted from transmitter to receiver.The 3rd, its maintenance has the constant LEDs brightness of 50% working cycle.Yet this encoding scheme needs two bits representing a data bit, and the system bandwidth that halves thus.Use the Manchester coding, the Frame of described 1024 bytes of Fig. 3 only sends the real data of 512 bytes.Although the Manchester coding is an optimized encoding scheme of the present invention, should be realized that and also can use much other coding techniquess, and these all is within the scope of the present invention.

General concurrent demonstration of the present invention and data communication system have been described, and several problem relevant with the optical data communication link, two kinds of designs that are used for transmitter (14 or 22) and receiver (16) provided now.Figure 4 and 5 are described first kind of design, and Fig. 6-12 describes second kind of design.Just as noted earlier, design one is preferably used in PC (or embedded) computing machine (or other non-multitask batch operation system) of operation DOS, and designs the two multitask batch operation systems that are used for such as the Windows of Microsoft.Should be noted that these two kinds of designs only are to can be used for operating schematically illustrating of the transmitter and receiver type of preferred concurrent demonstration and data communication system.Other design also is possible and is within the scope of the present invention.

Get back to accompanying drawing, Fig. 4 is the block scheme that is used for the digit preference data transmitter 40 of concurrent demonstration of the present invention and data communication system.This design (design one) is preferably used in the PC of the non-multitask batch operation of one of operation system, workstation, or embedded computer.Transmitter 40 can be coupled to beacon LED14 shown in Figure 1, or LED matrix display 22 shown in Figure 2.This preferred emission machine 40 comprises: parallel port interface 42; Data latches 44; Interface control circuit 43; System oscillator 56; System, control circuit 50; The pre-scalar 58 of baud rate; Cycle counter 54; Parallel-to-serial converter 48; And data transmitter 46.

The parallel port of PC (10A, 10B or 12) replaces RS232 mouth (serial port) and is used for digital data transmission.This is more desirable, because the RS232 agreement can change the brightness of LEDs and have a low data transfer rate.The general utility functions of transmitter 40 are that the parallel data from PC is converted to continuous serial data serial data, so that it can be sent out by the optical link between the transmitter and receiver.Also can use agreement similar to the above and encoding scheme.In this case, the software that moves on the computing machine that is coupled to transmitter 40 (executable program) comprises the software instruction that is used for according to selected agreement and encoding scheme formatted data.

A system oscillator 56 that provides a high-frequency signal (" SYSOSC ") to give the pre-scalar 58 of baud rate is provided transmitter 40, and the pre-scalar 58 of this baud rate is the binary counters that are used for the oscillator signal frequency division.This circuit 58 provides a programmable system clock frequency (" SYSOSC ") that is used for transmitter 40, so transfer rate is based on exercisable application of this system and condition changing.

Data latches 44 receives parallel digital signal from the parallel port 42 of PC.Data latches 44 is the scale-of-eight D-D-flip flops with the output of 3 attitudes.When it received signal from PC, the parallel data that is input to data latches 44 was latched in the output of parallel-to-serial converter 48 (buffered data, 8).

Cycle counter 54 and system controller 50 circuit are used for the timing of control transmission.What be coupled to these circuit is the SysINIT signal, and this is the system initialization signal from PC.Cycle counter 54 is synchronous 4 the addition/subtraction counters that preset.It provides 3 digit counter S[0..2 that are used for by system, control circuit 50 decoded state], system, control circuit 50 provides one to be used for its operated system control function.As signal S[0..2 from cycle counter 54] when all being zero, transmitter clock signal TXCLK is low and latchs data in the input of parallel-to-serial converter 48.

Be connected to the clock signal of interface control circuit 43 from the GetBuff signal of system, control circuit 50, interface control circuit 43 can be a J-K flip flop.The state of the negative edge of GetBuff conversion J-K flip flop makes BuffCLR lowly be ready to receive data from the parallel port that is used to transmit with indication transmitter 40.

Parallel-to-serial change-over circuit 48 is used for that parallel data is converted to serial data and it is controlled by the timing signal TXCLK from system, control circuit 50, and wherein parallel-to-serial change-over circuit 48 is one 8 bit parallel input/serial Output Shift Registers.

Interface control circuit 43 also is used to produce the handshake of getting back to PC.Interface control circuit 43 is one and has the marginal two J-K flip flops along trigger circuit that reset.Its J and K input are connected to the output of himself.When data were not sent out, the StrData signal was 0, this signal zero clearing trigger, so it is output as 1.When StrData was set to 1 during data transmission, the output of trigger was set to 0.Therefore, the function of this trigger provides the buffering reset signal (BuffCLR) of getting back to personal computer.

Interface control circuit 43 also is used to produce the rub-out signal of getting back to PC.StrDATA is not set at the rub-out signal that PC is got back in interface control circuit 43 generations when hanging down after 8 bit data bytes are transmitted.In this case, system error signal (SysERR) is set at 0 and send it to there is the twice transmission of 8 bit data in PC with indication mistake (copy transmissions).

After 8 specific bit data bytes are converted to suitable serial data stream with one by converter 48, these data (" TxData ") appear at data transmission circuit 46, data transmission circuit 46 amplifies these serial signals and is used to be coupled to light source (demonstration of for example LED beacon of Fig. 1, or the dot matrix of Fig. 2).

Fig. 5 is the block scheme that is used for the digit preference data receiver 60 of concurrent demonstration of the present invention and data communication system.The design receiver module 60 feasible light checkout equipment receiving digital datas that can use one or more photoelectric detectors or other type.Receiver 60 receives the light signal that is sent and the serial data that is received is converted to parallel 8 bit data with suitable timing and then by its parallel port these data is sent to the PC that is connected.The preferred embodiment of this digital data receiver 60 shown in Figure 5 comprises: parallel port interface 62; Data latches 66; Data receiver 68; Serial-to-parallel converter 70; Interface control circuit 76; Sync synchronizing circuit 78; System oscillator 82; The pre-scalar 80 of baud rate; Cycle-counter circuit 74; With system, control circuit 72.The operation of these preferred components is described below.

Receiver 60 comprises that one provides the system oscillator of high-frequency signal (" SYSOSC ") to the pre-scalar 80 of baud rate, and the pre-scalar 80 of baud rate is the binary counters that are used for the oscillator signal frequency division.Use these circuit 80,82, can select to be used for the different system clock frequency of receiver 60 so that the transfer rate of the transmitter 40 that coupling is correlated with.

Serial-to-parallel circuit 70 is one 8 bit serial input/parallel Output Shift Registers, and 8 bit serial input/parallel Output Shift Register is used for serial data is converted to the parallel data of data latches 66.Serial-to-parallel circuit 70 is by the timing signal RXCLK control from system, control circuit 72.This data latches 66 latchs 62 parallel digital data of the parallel port that is used for PC.Data latches 66 is the scale-of-eight D-D-flip flops with the output of 3 attitudes.When PC will obtain data, from the output of the signal GetDATA log-on data latch 66 of PC.Then, arrive data latches 66, the parallel data of its input is latched into its output owing to be used to store the signal (" StrBUFF ") of buffered data.

Cycle counter 74 and system controller 72 circuit are used to be controlled at the timing that receiver receives the data of input.The purpose that is used for system synchronization from the synchronous counter signal SynCNTR of sync synchronizing circuit 78.Cycle-counter circuit 74 is synchronous 4 the addition/subtraction counters that preset.It provides 3 digit counter S[0..2 that are used for the state of decode system control circuit 72] (3 to 8 row decoder), system, control circuit 50 provides one to be used for its operated system control function.

System, control circuit 72 is one 3 to 8 row decoders.It is accepted from cycle-counter circuit 74 S[0..2] counter output.As all input position S[0..2] when being high, signal StrBUFF is sent to data latches 66 by system, control circuit 72, so that latch data.Latch this data 1/8 o'clock of master clock frequency, so that latch shifted data from serial-to-parallel circuit 70 at reasonable time.Also the StrBUFF signal is sent to interface control circuit 76, this circuit propagates into PC with ready for data signal (" DataRDY ").If interface control circuit 76 can not receive the GetDATA signal, then system error signal SysERR is sent to PC.This just indicates in rewriteeing input 8-bit data and has mistake.

Be synchro system clock and the data that received, PC sends to sync clock circuit 78 with the SysSYNC signal.This just can receive by RXDATA up to sync clock circuit 78 till the negative edge of input data by the count value of SynCNTR signal suspension and reset pre-scalar 80 of baud rate and cycle-counter circuit.Then, its send the SysLOCK signal to PC with indication mechanism with import data sync.

Describe the decision design of the transmitter and receiver that is used for non--multitask batch operation system in detail, described second design (design two) now.This second design is preferably used in the computing machine with multitask batch operation system.Fig. 6-12 describes the preferred embodiment of this design.

Fig. 6 is the block scheme that is used for a digit preference data transmitter 110 with memory buffer unit of concurrent demonstration of the present invention and data communication system.This design (design two) is preferably used in the computing machine of the multitask batch operation system that has such as the Windows of Microsoft.In existing design, transmitter 110 is coupled to the parallel port 18 of PC (or on knee or embedded computer) through parallel port interface 126.The preferred embodiment of this circuit comprises: timing control circuit 112; Handshake circuit 114; First address generator 116 that is used for transmitter; Serial I/O (5IO) circuit 118; Multiplexer 120, dual port RAM impact damper 122; And second address generator 124 that is used for PC.

Transmitter is preferably designed as data are sent out by the parallel port among the PC 18.Yet, under the environment of Windows95, there is the periodic interruption of parallel port, do not transmit data at intercourse.Like this, the transmitter serious delay of appearance in sending data that in interrupt cycle, does not have memory buffer unit.Therefore, provide digital data transmitter not to be sent out so that data can have interruptedly by optical link with memory buffer unit.

Another advantage of configuration shown in Figure 6 is transmitter is realized some requirement in hardware a communication protocol.This can simplify the timing controlled of software design and transmitter.Then this computing machine concentrates on and writes data into memory buffer unit.

Dual port RAM 122 is as the memory buffer unit in the transmitter 110.Because dual port RAM allows the data of read and write simultaneously, so use such storer, this has also simplified design.Can also use the technology of paging memory management.Dual port RAM 122 is divided into two parts that are called locked memory pages.When PC write data into a page storage, transmitter was read, and sent data from another locked memory pages.After finishing from the write and read of a page, the swapping memory page, and the exchange page read data that transmitter is writing data from PC is to be used for transmission.A serial i/O circuit 118 (SIO) is used for the parallel data from PC is converted to serial data stream to be used to be transferred to receiver.

When realizing design shown in Figure 6, also there are two the relevant operating conditionss of the timing with the data read and write that to consider.In the following description, tPC represents that PC finishes and writes the used time of one page, and tSIO represents that SIO circuit 118 is finished and reads the used time of one page.Two conditions shown in Fig. 7 and 8 are described below.

Fig. 7 is schematically illustrating of an operating conditions relevant with the digital data transmitter among Fig. 6, and wherein included serial input-output apparatus read time is lower than the PC that is coupled to data transmitter, tPC＜tSIO, that is and, the SIO read time is lower than PC and writes the time.Shown in Figure 90, when SIO118 was relatively slowly reading a data block, PC write a data block, and PC only waits for that SIO circuit 118 reads and then exchange memory page to finish data.

Fig. 8 is the synoptic diagram of an operating conditions relevant with replacing digital data transmitter, wherein included serial input-output apparatus read time than the PC that is coupled to data transmitter fast-(2) tPC＞tSIO, that is, it is fast that the SIO read time is write the time than PC.As shown in the drawing, to read a data block than SIO118 slow when PC writes a data block, and SIO118 only sends idle bytes (previously described) after SIO118 has read and sent this data block.PC finished write a data block after, then the swapping memory page is to be used for the transmission of another page.

Get back to Fig. 6, illustrate and use the block scheme of a dual port RAM as the digital data transmitter of a memory buffer unit.Being coupled to circuit shown in Figure 6 is a parallel port interface 126.This interface is with 8 position datawires, and four output control contact pins and two input control contact pins are connected to and are used for the transmitter circuitry that data transmit and shake hands.8 position datawires represent to be sent by transmitter 110 data byte of (serial).Four output control contact pins are called as #INIT, #PCStore, FrameStx and PCNext.Two input control contact pins are called as TerPC and TerSIO.

#INIT output control contact pin is used for the initialization transmitter.#PCStore is the signal that an indication writes data dual port RAM 122.FrameStx be used to reset PC and SIO124,116 address generator (address counter).PCNext is used to increase the address counter of each 8 bit data bytes.TerSIO is used to indicate SIO118 whether to finish the data of sending a locked memory pages.And whether TerPC is used to indicate PC to finish to write locked memory pages data.

Two address counters 124,116 of PC and SIO are preferably counter separately.These two counters are increased to produce the address of dual port RAM 122 by signal PCNext and INC (from timing control circuit 112).These two counters are resetted by the FrameStx signal from PC.They also produce two signals that are called as TerSIO and TerPC and finish with the storage access of indicating SIO and PC respectively.

Comprise a handshake circuit 114 to be used for the swapping memory page, also when decision selects the idle bytes sent by SIO 118.Handshake circuit 114 is read two signals from two address generators, TerSIO and TerPC, and generation is called as PC-MSB, SIO-MSB, and three outputs of SelSync.PC-MSB is the highest significant position of the address of the highest significant position of address of the dual port RAM 122 on the PC side of storer and the dual port RAM 122 on the SIO side that SIO-MSB is storer.When PC-MSB is set to when high, SIO-MSB must be set to low, and vice versa.Observe TerSIO and TerPC is set when handshake circuit 114, the state of its conversion PC-MSB and PC-SIO is so that can the swapping memory page.In addition, when TerPC is set to after TerSI when low handshake circuit 114 SelSync is set at height.The SelSync signal is used to select SIO118 whether to send idle bytes or dual port RAM data.

Timing control unit 112 is used for producing time-controlled three signals that are used for SIO 118.These signals are BitShift, StrBuff and INC.BitShift is used for the clock signal of SIO118 so that displacement is changed serial output data with parallel data.Per 8 bit periods send StrBuff, so that parallel 8 bit data are stored in impact damper on the SIO118 to be used for transmission.And INC is used to increase the address generator 116 on the SIO side of double port memory 122.SIO118 is a shift register so that the parallel data line displacement is exported (TxDataOutput) to drive the LEDs of concurrent demonstration and data communication system for serial.

Fig. 9 is a block scheme that is same as the digital data receiver with storage buffer of concurrent demonstration of the present invention and data communication system.Use this design in conjunction with transmitter (not shown) shown in Figure 6.These preferred receiver 150 designs comprise: parallel port interface 168; Synchronizing circuit 152; SIO circuit 154; Latch 156; Dual port RAM impact damper 158; The address generator 160 that is used for the SIO side of dual port RAM impact damper 158; Handshake circuit 162; Timing control circuit 164; And the address generator 166 that is used for the PC side of dual port RAM impact damper 158.

Except that having increased synchronizing circuit 152 and Sync counter, the design of receiver aspect a lot of with the design class of the transmitter with memory buffer unit shown in Figure 6 seemingly.Dual port RAM 158 is as the memory buffer unit in the receiver, and is similar with corresponding transmitter circuitry.Also can use above-mentioned paging memory administrative skill.According to this technology, dual port RAM 158 is divided into two locked memory pages.When page sense data in storer of PC, receiver will receive and write data to another page.After the write and read of finishing a page, the swapping memory page, then PC reads the data that are used to transmit from the exchange page that receiver has just write data.Serial i/O (SIO) circuit 154 is used for serial data is converted to parallel data, and the mode used with the transmitter circuitry of Fig. 6 is opposite.

When realizing design shown in Figure 9, should consider and relevant several operating conditionss of reception from the idle bytes of transmitter, and the source of error frame.Figure 10 that is described below-12 illustrates this three conditions.

Figure 10 is the synoptic diagram of the operating conditions relevant with the digital data receiver among Fig. 9, does not wherein receive idle bytes.During data transmission, this situation appears when transmitter is not sent any idle bytes.This situation also appears in the data that can send than the SIO of transmitter as the PC of transmitter when sending data soon.Figure 10 is illustrated in this case, and receiver receives the required timing (130) of data.The PC of receiver will wait for another locked memory pages by the SIO154 filling of receiver.After SIO 154 had received a page, PC began the page sense data that write by SIO from just.

Figure 11 is the synoptic diagram of the operating conditions relevant with the digital data receiver among Fig. 9, wherein receives idle bytes between frame.This situation appears when the PC of transmitter sends data slowly than the SIO of transmitter.Figure 11 illustrates the required timing of receiver reception data under this situation.The PC of receiver will wait for the beginning of next incoming frame.Received after a page begins at SIO 154, PC begins the page sense data that write by SIO from just.

It is long that the time that receiver receives a frame and this idle bytes should be read time of a locked memory pages (that is a frame) than PC.Equally, may go wrong and have the possibility of losing a frame.Yet to read time of locked memory pages of receiver side long if PC writes the time ratio PC of locked memory pages of emission pusher side, has nothing to do with the SIO transfer rate.Explain this characteristics at Figure 12.

Figure 12 is the timing diagram in the mistake source in the interpreted frame.As shown in the drawing, the time that sends idle bytes is based on time T pc Tx.If Tpc tx increases, the time that then is used to send idle bytes also increases.This means that the time that allows receiver PC to read the page also increases.Therefore, as long as TpcRx＜Tpctx, then receiver can receive all frames of zero defect.In fact, if receiver PC can not catch up with transmission, then can postpone to realize by in transmitter PC, increasing some.

Get back to Fig. 9, illustrate and use the block scheme of a dual port RAM as the numerical data of a memory buffer unit.Being coupled to circuit shown in Figure 9 is a parallel port interface 168.This interface 168 comprises one 8 position datawire byte, three output control contact pins and three input control contact pins, and these three input control contact pins are used for data and transmit and the purpose of shaking hands.8 position datawires represent to be sent by transmitter 110 data byte of (serial).Four output control contact pins are called as #INIT, #PCStore, FrameStx and PCNext.Three input control contact pins are called as TerPC, TerSIO and Error.

#INIT control contact pin is used for the initialization transmitter.The FrameStx address generator 166 (address counter) on the PC side that is used to reset.PCNext is used to increase the address counter of each 8 bit data.TerSIO is used to indicate SIO154 whether to finish a reception operation and a locked memory pages data storage is arrived dual port RAM 158.Reading of the data that TerPC is used to indicate PC whether to finish a locked memory pages.8 position datawires are used for actual data and transmit.

Two address counters 166,160 (being used for PC and SIO) are counter.These two counters are increased to produce the address of dual port RAM 158 by signal PCNext and INC.These two counters are resetted by the FrameStx signal from PC.They also produce two signals, and TerSIO and TerPC finish with the storage access of indicating SIO and PC respectively.

A handshake circuit 162 also produces an error signal (Error) to PC to be used for the swapping memory page.Handshake circuit 162 is read two signals, TerSIO and TerPC, and generation is called as PC-MSB, SIO-MSB, and three outputs of Error.PC-MSB is that the highest significant position and the SIO-MSB of the address of the dual port RAM 158 on the PC side is highest significant positions of the address of the dual port RAM 158 on the SIO side.When PC-MSB is set to when high, SIO-MSB must be set to low, and vice versa.Observe TerSIO and TerPC when handshake circuit 162 and be set to when high, the state of its conversion PC-MSB and PC-SIO is so that can the swapping memory page.In addition, when TerPC is set to after TerSI when low handshake circuit 162 Error is set at height.Error signal be used to the report to the police PC of the Frame that may lose.

Timing control unit 164 is used for producing time-controlled three signal-BitShift, StrBuff and the INC that are used for SIO 154.BitShift is used for the clock signal of SIO154 so that displacement is changed parallel input data with serial data.Per 8 bit periods send StrBuff, so that parallel 8 bit data of displacement are stored in latch 156.And INC is used to increase the address generator 160 of SIO.

A synchronizing circuit 152 is increased in the receiver.This unit is used for the timing between synchro transmitter and the receiver, and counts the Sync byte number that is received.It is read to produce a ValidData signal to timing control circuit 164 from RxData and 8 bit parallel data.When this circuit has been counted enough Sync bytes, set ValidData so that this frame can be used for being written into dual port RAM 158.

Described the general-purpose system of the present invention (comprising two types the design that is used for transmitter and receiver) of the concurrent demonstration and the data communication that are used to use LED in detail, should be appreciated that the instruction of this system and openly can be used for a plurality of application.Describe three-(a) speed of a motor vehicle qualification application in these a plurality of application below in detail, (b) application of parking stall and guidance system and (c) portable travel information and position system.Yet, should be noted that this is three possible application in the above-mentioned general-purpose system.The principle of general concurrent demonstration and data communication system and notion can be used for a plurality of not specifically described other application.

2. vehicle-speed limit system

Figure 13-16 has described a use and has had LED as the concurrent demonstration of concurrent parts and the vehicle-speed limit application of data communication system, and wherein LED embeds traffic lights, street lamp, message display board, road sign or similar device.

System shown in Figure 13 can comprise several parts that are installed in the automobile, and for example: visible light receiver module 190, central processing module 196 is reported to the police or display unit 192,194, and vehicle speed sensor 198.Receiver module 190 can be operated with like above-mentioned two receiver design class that are used for general-purpose system.At automobile external, this system can comprise the demonstration of using LED and one or more concurrent sources of data communications, and for example street lamp 180, traffic lights 182, message display board 184 or road sign 186.Concurrent demonstration/data communication the parts of other type also can be used for this application.

According to system shown in Figure 13, modulation is by the traffic lights 182 in regulation zone, street lamp 180, and the visible light that the light emitting diodes (LED) in message display board 184 or the road sign 186 send is so that have speed limit from the visible signal of LED.In these light sources each comprises a suitable transmitter circuitry (rule relevant with above-mentioned general-purpose system is similar) that is used to use the proper data modulated light source and the LED that powers.By this way, LEDs is as display unit (for example part of traffic lights 182) and data communication parts (as the speed limit of the data of being communicated by letter) operation.The automobile 188 that moves in the regulation zone has one and is used for detecting by each traffic lights 182 street lamp 180, the receiver module 180 of the visible luminous energy of modulation that display board 184 or road sign 186 send.The visible signal that receiver module 190 demodulation on the automobile 188 and processing are received is to obtain speed limiting information.Processing unit 196 is carried out from the comparison between the car speed of mileometer and the speed limiting information that sent.The Che Nei system can also provide the warning and the display unit 192,194 of one or more types, if so that its automobile surpasses the speed limiting information that is sent then sends signal to the driver, wherein warning and display unit 192,194 can increase the audio frequency indication.As a kind of replacement, can use some increment speed, limit a predetermined value so that surpass the speed that is sent at automobile, for example, per hour 5 miles per hours use warning indicator.In addition, this system also sends signal to automobile control unit 210 and mates this speed and limit to reduce the speed of a motor vehicle.By this way, system is complete closed loop.

Figure 14 is the figure of a visible light LED transmitter 200 relevant with application shown in Figure 13.This transmitter 200 can be installed near concurrent display unit 180,182,184 or 186, perhaps can be placed on some position, for example the bottom of lamp stand or be in some auxiliary electronic equipment shell.This circuit comprises a control circuit (" MCU ") 202, a plurality of drive circuits 204, and the one or more LED206 that are connected to each drive circuit 204.According to specific data protocol MCU202 suitable car speed restricting data is packaged as suitable data block.Coding and protocol scheme example about general-purpose system have been described above.Then use this data-driven led array 206.Data block from MCU202 comprises the sync byte that triggers car inner receiver module 190.Also can use error correction coding.Driver/buffer circuit 204 provides enough electric currents to drive the LED206 of one group of series connection, although may be that a driver is used for each LED206 in this replacement.Repeat to be provided with driver 204 and LED206 to constitute needed led array size.Should be noted that above-mentioned instruction and principle about universal transmitter and receiver design, and the coding techniques of being discussed, data communication protocols etc. can be used to any application as herein described.

Figure 15 is a block scheme of using relevant Che Nei system with the vehicle-speed limit of Figure 13.The Che Nei system can comprise a central processing module 196, VISIBLE LIGHT EMISSION machine module 190, speed of a motor vehicle module 198, alarm unit 192 and display unit 194.Central processing module 196 is preferably controlled other module.It receives the data from VISIBLE LIGHT EMISSION machine module 190 and speed of a motor vehicle module 198.The purpose of speed of a motor vehicle module 198 is to determine the present speed of automobile.Can obtain this reading from sensing data, for example from mileometer.Sensing data is sent to central microprocessor 196 by a serial line interface.Data from speed of a motor vehicle module 198 and VISIBLE LIGHT EMISSION machine module 190 are handled by central processing module 196, and suitable information is outputed to demonstration 194 and the Unit 192 of reporting to the police.What also show is optional automobile control unit 210, and this unit is coupled to CPU (central processing unit) 196 makes it limit consistent with the speed that sends so that adjust the speed of automobile automatically.By this way, the Che Nei system prevents that as one automobile from surpassing the long-range actuation control of the closed loop system of the speed qualification that is marked.

Figure 16 is the block scheme of a visible light receiver module relevant with automotive system shown in Figure 15.The instruction and the disclosure that should be noted that two receiver designs of general-purpose system also can be used for design shown in Figure 16.As shown in the figure, receiver module 220 can comprise a light detecting sensor 222 (photoelectric detector for example, photodiode array, CCD etc.), differential amplifier 224, positive pulse detecting device 226 and negative pulse detecting device 228, and data recovery circuit 230.The proportional voltage of light intensity that light detecting sensor 222 detects visible light energy and is converted into and received.Differential amplifier 224 is used to reduce the 50Hz The noise of being introduced by fluorescence, and described fluorescence is positioned near the system.Differential amplifier 224 amplifies such as from high to low or the high-frequency signal from low to high.The output of differential amplifier 224 comprises the positive and negative pulse.These pulses were opened and were fed back to data recovery circuit 230 in 226,228 minutes by the positive and negative pulse detector.Data recovery circuit 230 comprises that positive and negative pulse capable of being combined is to form the set-reset flip-floop of the data stream that is received.Central processing module 196 then extracts the velocity information that is sent from this data stream.

3. automobile position and guidance system are used

Figure 17 is to use traffic lights, street lamp, message display board, road sign, or the figure of the automobile position of the of the present invention concurrent demonstration of the LED in the similar device and data communication system and guidance system application.Aspect a lot, removing by concurrent parts 180,182,184 or 186 information that sent is not speed information, but with the position of automobile and geographical relevant on every side information thereof with transportation condition outside, this system and above-mentioned speed of a motor vehicle qualification system class are seemingly.

In this system, the automobile 188 that moves in regulation zone comprises and is used for detecting by each traffic lights 182 street lamp 180, the device 190 of the modulation visible light energy that display board 184 or road sign 186 are launched.Positioning system 240 on the automobile (calculating system that stops that for example having digital compass) detect automobile the distance and the direct of travel of process.Receiver 190 demodulation on the automobile 188 and handle from and the received signal of light emitting source, then use the positional information that is received with the positioning system 240 in the calibration automobile 188.By display device 242 display positions, guide and transport information and provide sound signal by a loudspeaker.Display device 242 can comprise that is used for a displayed map information, positional information, traffic data, traffic light status, and to such as the refuelling station, hospital, or the graphic interface of the distance of the various service locations of parking lot (only listing several) and so on.

Fig. 17 illustrates an example of visual and audio unit 242 in the car.Although also can use the indicating device of other type, it passes through line display automobile position on road map anyhow.On the right side that shows is information area.In this zone, show traffic signals, guide position and information.For audio unit, loudspeaker can output audio information with direct drivers.For example, with reference to Figure 17, automobile is in the meet on Bonham road and Pokfulam road.Traffic lights is green.For arriving nearest hospital, the driver must turn left and travel 1.5km.This buildings is positioned at neighbouring and a message display board message of output " road book " is given the driver.Audio unit tells the driver to pass through the position of traffic lights and automobile.

Figure 18 is the block scheme of the inertial positioning module 240 relevant with system applies shown in Figure 17.This module 240 comprises accelerometer 252, gyroscope 250, and mileometer 254, digital compass 262 is coupled to A/D converter 260, control module 256 and the serial interface unit 258 of accelerometer 252 and gyroscope 250.The distance that these locating module 240 definite automobiles are travelled and the angle of turning.From accelerometer 252, gyroscope 250, the sensing data of the data of mileometer 254 and digital compass 262 is sent to the central processing system 196 of automobile.By traffic lights, street lamp, the locating information that message display board or road sign send is proofreaied and correct the shown accumulation drift error of inertial sensor.

Locating module can comprise four kinds of different sensors, comprises mileometer 254, accelerometer 252, and gyroscope 250 and digital compass 262 be not although need all these sensors.Mileometer 254 is measured the revolution that wheel turns over.The revolution that is shown electric pulse by count table calculates the distance that running car is crossed then.The accelerating force that accelerometer 252 measured automobiles have.Then by integrating acceleration and integration aggregate velocity calculate automobile the distance of process.The angular velocity that gyroscope 250 measured automobiles turn over.Follow the angle that turns over by the measured angular speed calculation automobile of integration.Digital compass 262 is used for the direction of measured automobiles with respect to positive north.The design of each sensor interface is similar.Each alignment sensor is connected to the control sensor and carries out the controller unit 256 that calculates.Then sensing data is sent to central microprocessor 196 by serial line interface 258.

4. portable travel information and positioning system are used

Figure 19 is the figure of a portable travel information system applies of concurrent demonstration of the present invention and data communication system.Remove in this is used by concurrent parts 180,182, outside the portable unit 290 that 184 and 186 information that send are had by tourist's (or other moving body) receives, aspect a lot of this system with about car in the said system used similar, wherein portable unit 290 can also send it back information light source 180,182,184 and 186.Concurrent parts can comprise the receiver components 270 that is used for receiving from portable unit 290 data transmission.By this way, provide a kind of two-way concurrent demonstration and data communication system.

In the system shown in Figure 19, modulation is by the traffic lights 182 in the regulation zone, street lamp 180, light emitting diode (LED) visible light emitted on message display board 184 or the road sign 186 (or similar device), so that visible signal has the position, this area map, the main sight spot/buildings in the public transport station, adjacent area and/or the information or the data of director information or other type.Traffic lights 182, street lamp 180, message display board 184 or road sign 186 can also comprise the device 270 that is used to receive tourist's request signal.Tourist or hiker have a portable information and positioning system 290, this system comprises and being used for from concurrent demonstration/data communication parts (180,182,184,186) receive modulation intelligence and information is sent it back the device of the receiver relevant 270 with these parts.Can be by display device 272 display positions, travelling and director information, display device 272 is as the part of portable system 290, and the position, and the loudspeaker 280 that travelling and director information can also pass through to be added is expressed as sound signal.Display device 272 can comprise that the situational map with the indication tourist who uses cross-hair shows 278, be used for information interface 274 to tourist's display message choice menus, be used for positional interface 276 to tourist's display position choice menus, selector button 282, and be used for the scroll button 284 that moves by interface menu.In interface, can also provide other parts.

Figure 20 is the block scheme of a preferred portable travel information and position units 290.This unit 290 can comprise visible light receiver module 298, transmitter module 292, central processing module 294, visible and audio unit 272,280, and user's load module 296.Receiver module 298 from concurrent demonstration/data communication parts receive the visible light energy of modulation and with its demodulation with acquired information.Then by central processing module 294 process informations, this module 294 is determined the information content shown or that show, and display message how.Central processing module 294 comprises the microprocessor system that other module of control and actual figure reportedly send.The tourist uses user's load module 296 order portable modules 290.User's load module can provide manual input, and for example selector button 282 or scroll key 284 perhaps as a kind of replacement, provide a kind of speech recognition module, so that the tourist can use voice command to indicate this unit.The input media of other type also is possible.

Input command is sent to transmitter module 292 from central processing module 294.Transmitter module 292 sends to user request signal and traffic lights 182, street lamp 180, the receiver unit 270 that message display board 184 or road sign 186 are relevant.By this way, provide a kind of interactive travelling and guidance system, wherein the tourist can select from the content of the information of concurrent demonstration/data communication system download.

Figure 19 illustrates an example of the operation of this portable travel information system.At user interface 272, on local street map, show tourist or hiker's position with cross curve.Download local street map from concurrent parts (180,182,184,186).These parts can be connected to other parts and/or solicited message be offered tourist's computer system by a network 286.

On the user interface right side is Information Selection zone 274 and positional information zone 276.In these zones, the tourist can select from the information content of concurrent parts download.At this example,, then download the corresponding informance relevant with near restaurant if select ' restaurant '.Then the position in restaurant and the spring menu in information area also provide some to introduce the restaurant near map shows these.The out of Memory that is sent out comprises hospital, the police office, and the shopping mall, commercial center, office of airline, the taxi station, subway station, or airport bus information are only listed several.The tourist is beginning its destination can be imported portable module 290 before the travelling.If comprise this destination in the module, then the information of destination will be presented on the local map.In addition, can the calculating optimum route and on map, show.If the tourist is just near the destination then can provide voice signal by system.

Figure 21 is the synoptic diagram that is used for an example user interface of portable travel information shown in Figure 20 and position units 290.At information area 274, the user can select it to want the information of watching, and for example " hospital ", " police office ", " restaurant " etc. for example, supposes that the tourist will find the restaurant of having supper.He can be near near the traffic lights of the system that is coupled to, street lamp, message display board or road sign.Then, he can select ' restaurant ' in info menu.A menu 274A who pops up will be presented at information area.From here, he can select its restaurant type of thinking, for example Chinese restaurant.The menu 274B that another pops up then appears.From here, it can select the restaurant grade of its consumption.Then, the tabulation 274C that shows near the restaurant of satisfying its needs.At last, he can be in the tabulation 274D information of watching the restaurant.In an identical manner, each Information Selection can comprise the menu that pops up of one group of additional retrieval relevant information that is used for further refinement tourist in information area.

Above-mentioned the preferred embodiments of the present invention and several application only provide and are not used in by example and limit scope of the present invention, and scope of the present invention is defined by the claims.Other parts and step can be used for replacing shown parts and step.In addition, a lot of other application of general concurrent demonstration and data communication system also are possible and are within the scope of the present invention.

Claims

1. one kind and signaling and data communication system comprise:

Data presentation and communication system;

A data receiving system; And

Be coupled to one or more LED of data presentation and communication system, LED is used to launch the data traffic signals of visual display signal and modulation.

2. system according to claim 1, wherein data presentation and communication system comprise:

First computing machine;

Be coupled to a data transmitter circuitry and one or more LED of first computing machine; And

A data communication computer program that is used to produce a digital data signal of on first computing machine, moving.

3. system as claimed in claim 2, wherein data presentation and communication system further comprise a data presentation computer program that is used to control the generation of visual display signal that moves on first computing machine.

4. system as claimed in claim 2, wherein data presentation and communication system further comprise:

Second computing machine; With

A data presentation computer program that is used to control the generation of visual display signal that on second computing machine, moves.

5. the system as claimed in claim 1, wherein data receiving system receives the modulating data signal of communication by one or more LED emissions.

6. system as claimed in claim 5, wherein data receiving system comprises:

A photodetector;

A Data Receiving machine circuit that is coupled to photodetector; With

A receiving computer system that is coupled to data receiver circuit.

7. system as claimed in claim 6 comprises that further one is used for receiving the modulating data signals of communication and being used for the modulating data signal of communication is focused on the lens of photodetector from one or more LED.

8. system as claimed in claim 6, wherein photodetector is a photoelectric detector.

9. the system as claimed in claim 1 wherein is configured to one or more LED two-dimensional lattice and shows.

10. system as claimed in claim 6 further comprises a data communication computer program that is used to control the reception of modulating data signal of communication of moving in the receiving computer system.

11. system as claimed in claim 2, wherein the data transmission machine circuit is coupled to first computing machine through a parallel interface.

12. system as claimed in claim 9, wherein the dot matrix demonstration can produce and comprise character, word, image, the visual display signal of the figure or the pattern of modification.

13. system as claimed in claim 2, wherein the data transmission machine circuit comprises the modulation circuit that is used for producing from the digital data signal that is produced by the data communication computer program that operates in first computing machine modulating digital data signal.

14. system as claimed in claim 13, wherein the data transmission machine circuit is used for one or more LED with the modulating digital data signal.

15. system as claimed in claim 14, wherein the modulating digital data signal by the LED emission is in high frequency so that LED shows as constant illumination concerning human eye.

16. system as claimed in claim 6, wherein data receiver circuit comprises the device that is used for demodulation modulating digital data signal.

17. system as claimed in claim 2, the wherein operating system of a non-multitask distribution of first computer run.

18. system as claimed in claim 2, the wherein operating system of a multitask distribution of first computer run.

19. the system as claimed in claim 1 wherein turns to a plurality of Frames with modulating digital data signal format.

20. system as claimed in claim 20, wherein each Frame comprises:

The start frame sync byte;

A plurality of beginning bytes and data byte; And

The end frame sync byte.

21. system as claimed in claim 20, wherein each Frame further comprises idle bytes.

22. the system as claimed in claim 1 is wherein used manchester fgs encoder modulating digital data signal.

23. system as claimed in claim 2, wherein the data transmission machine circuit comprises:

Be used for from the parallel port interface of the first computing machine receiving digital data signal;

Be used for digital data signal is converted to the parallel-to-serial converter of serial data stream; And

Be used for the clock rate of control transformation device so that produce the modulation control circuit that is coupled to parallel-to-serial converter of modulating digital data signal.

24. system as claimed in claim 23, wherein modulation control circuit comprises:

A system oscillator; With

One is coupled to the pre-scalar of baud rate that system oscillator is used to produce the optional modulating frequency of the parallel-to-serial converter of clock.

25. system as claimed in claim 23, wherein the data transmission machine circuit further comprises a data latches that is coupling between parallel port and the parallel-to-serial converter.

26. system as claimed in claim 6, wherein the Data Receiving machine circuit comprises:

Serial-to-parallel converter, being used for the modulating digital data conversion of signals is serial data stream;

The demodulation control circuit is coupled to serial-to-parallel converter, and the clock rate that is used for the control transformation device is to recover digital data signal; And

The parallel port interface, the digital data signal that is used for recovering is coupled to the receiving computer system.

27. system as claimed in claim 26, wherein the demodulation control circuit comprises:

System oscillator; With

Be coupled to the pre-scalar of baud rate that system oscillator is used to produce the optional frequency, demodulation frequency of the serial-to-parallel converter of clock.

28. system as claimed in claim 26, wherein the Data Receiving machine circuit further comprises the data latches that is coupling between parallel port and the serial-to-parallel converter.

29. system as claimed in claim 27, wherein the Data Receiving machine circuit further comprises the clock synchronization circuit that a modulating frequency that is used to guarantee frequency, demodulation frequency and receive the modulating digital data signal is mated.

30. system as claimed in claim 2, wherein the data transmission machine circuit comprises:

Serial I/O (SIO) circuit is used for parallel digital data signal is converted to serial modulating digital data signal; And

Be coupling in the storage buffer between parallel port interface and the SIO circuit.

31. system as claimed in claim 30, wherein storage buffer is a dual port RAM.

32. system as claimed in claim 31, wherein the data transmission machine circuit further comprises a pair of address generator of each mouthful that is used for dual port RAM.

33. system as claimed in claim 30, wherein the data transmission machine circuit further comprises a timing control circuit that is used to control the modulating frequency of SIO circuit.

34. system as claimed in claim 6, wherein the data transmission machine circuit comprises:

Serial I/O (SIO) circuit, the modulating digital data conversion of signals that is used for receiving is a demodulation parallel digital data signal;

The parallel port interface is used for the demodulation digital data signal is coupled to the receiving computer system; With

Storage buffer is coupling between parallel port interface and the SIO circuit.

35. system as claimed in claim 34, wherein storage buffer is a dual port RAM.

36. system as claimed in claim 35, wherein the Data Receiving machine circuit further comprises a pair of address generator of each mouthful that is used for dual port RAM.

37. system as claimed in claim 34, wherein the Data Receiving machine circuit further comprises a timing control circuit that is used to control the frequency, demodulation frequency of SIO circuit.

38. a vehicle-speed limit system comprises:

As concurrent demonstration and data communication parts that visual display unit (VDU) and data communication parts are operated simultaneously, wherein the data by concurrent demonstration and the emission of data communication parts are vehicle-speed limit data; With

Data processing receiver in the car is used for receiving the vehicle-speed limit data that sent and handling the data that received from concurrent demonstration and data communication parts.

39. system as claimed in claim 38, wherein concurrent demonstration and data communication parts are street lamps, traffic lights, message display board or road sign.

40. system as claimed in claim 38, wherein concurrent demonstration and data communication parts comprise one or more LED.

41. system as claimed in claim 40, wherein the LED emission has the modulated digital signal of vehicle-speed limit data.

42. system as claimed in claim 38, wherein the data processing receiver comprises in the car:

The visible light receiver module is used to receive the vehicle-speed limit data by concurrent demonstration and the emission of data communication parts; With

Central processing module is coupled to the visible light receiver module, is used to handle the vehicle-speed limit data.

43. system as claimed in claim 42, wherein the vehicle-speed limit data comprise the modulating digital data signal, and wherein the visible light receiver module comprises and is used for demodulation modulating digital data signal to recover the device of vehicle-speed limit data.

44. system as claimed in claim 42, wherein the data processing receiver further comprises a speed of a motor vehicle module that is used to provide the automobile present speed in the car.

45. system as claimed in claim 44, if wherein central processing module the present speed of the vehicle-speed limit data that sent and automobile is compared and the present speed of automobile greater than the vehicle-speed limit data that sent, then produce an alerting signal.

46. system as claimed in claim 45, wherein the data processing receiver further comprises the warning or the display unit of the alerting signal coupling that produces with central processing module in the car, is used to warn the present speed of driver's automobile of automobile to surpass the speed limit data that is sent.

47. system as claimed in claim 45, wherein the data processing receiver further comprises an automobile control unit in the car, if the present speed of automobile surpasses the speed limit data that is sent, then this unit is used for adjusting automatically car speed.

48. system as claimed in claim 42, wherein the visible light receiver module comprises:

A light detecting sensor; With

One is coupled to this sensor and is used for the data recovery circuit of demodulation by the signal of light detecting sensor reception.

49. system as claimed in claim 48, wherein the visible light receiver module further comprises differential amplifier and positive negative pulse stuffing detecting device that is coupling between light detecting sensor and the data recovery circuit.

50. bus location and guidance system comprise:

As concurrent demonstration and data communication parts that visual display unit (VDU) and data communication parts are operated simultaneously, wherein the data by concurrent demonstration and the emission of data communication parts comprise position and directs data; With

Data processing receiver in the car comprises CPU (central processing unit), the visible light receiver module, and be used for receiving position and director information that is sent and the locating module of handling the data that received from concurrent demonstration and data communication parts.

51. system as claimed in claim 50, wherein position and director information comprise locating information, transport information, and cartographic information, the road conditions condition, traffic signal state, or near the direction of facility.

52. system as claimed in claim 50, wherein the data processing receiver further comprises a visual and audio frequency display unit that is used to show the information that is sent by concurrent demonstration and data communication parts in the car.

53. system as claimed in claim 52, wherein visual and audio frequency display unit provides the local road map of an expression automobile current location.

54. system as claimed in claim 52, wherein visual and audio frequency display unit be provided for to driver's audio frequency provider to loudspeaker.

55. system as claimed in claim 52, near the demonstration of the current state of traffic lights wherein visual and audio frequency display unit provides.

56. system as claimed in claim 52, near the demonstration of the direction of facility wherein visual and audio frequency display unit is provided to.

57. system as claimed in claim 50, wherein central processing module receives position and the locating information that concurrent demonstration and data communication parts are sent and uses this information with the calibration locating module.

58. system as claimed in claim 50, wherein locating module comprises one or more inertial sensors in the car, for example accelerometer, gyroscope, mileometer or digital compass.

59. system as claimed in claim 50, wherein locating module comprises an accelerometer, an AD converter, a controller and the serial line interface to central processing module.

60. system as claimed in claim 58, wherein the inertial sensor drift is overtime, and wherein should drift be proofreaied and correct according to the position and the director information of concurrent demonstration and the transmission of data communication parts by central processing module.

61. portable travel information and positioning system comprise:

Concurrent demonstration and the data communication parts operated simultaneously as visual display unit (VDU) and data communication parts; With

Portable travel information system is used for receiving the data that sent and with the user of this data presentation to this portable travel information system from concurrent demonstration and data communication parts.

62. system as claimed in claim 61, wherein concurrent demonstration and data communication parts comprise a receiver that is used to receive the information that portable travel information system sent.

63. system as claimed in claim 61 further comprises a plurality of concurrent demonstration and the data communication parts that intercouple by network.

64. system as claimed in claim 61, wherein concurrent demonstration and data communication parts comprise the one or more LED that are used to launch the modulating digital data signal.

65. as the described system of claim 64, wherein portable travel information system comprises and is used to receive the receiver of modulating digital data signal and is used for this modulation signal of demodulation to recover the device of digital data signal.

66. system as claimed in claim 61, wherein portable travel information system comprises:

The visible light receiver module;

CPU (central processing unit);

User's load module;

Display unit;

Audio unit; With

Transmitter module.

67. system as claimed in claim 61, wherein portable travel information system comprises a graphical user interface that is used for information is shown to system user.

68. as the described system of claim 66, wherein display unit provides by the graphic presentation of visible light receiver module from the information of concurrent demonstration and the reception of data communication parts.

69. as the described system of claim 67, wherein graphical user interface comprises the map of the current location of an expression system user.

70. as the described system of claim 67, wherein graphical user interface comprises that a plurality of the going up that is described near the facility in system user position plays menus.