JPS6159926A - Optical correspondence equipment between mobile bodies - Google Patents

Abstract

PURPOSE:To attain voice communication between mobile bodies during running by using the compression transmission system utilizing optical communication so as to attain corresponding between the mobile bodies. CONSTITUTION:In transmitting voice information from a cabin CT1 to a CR1, the cabin CT1 sets and ID code IDR predetermined and specific to the cabin CR1 and this code IDR is irradiated toward the cabin CT1 by optical transmission. After the code IDR is received, the cabin CR1 irradiates the IDR code toward the CT1 while being superimposed on the focus beam O2. The cabin CT1 receives the focus beam O1, and when the irradiated code IDR is coincident with the code IR irradiated before and the received level is high, that is, the light reception sensitivity is best (when optical axes are coincident), the cabin CT1 transmits a voice signal momentarily as a transmission light beam O2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an optical communication device between moving bodies that utilizes optical communication and is capable of voice communication between moving bodies that are moving, for example.

[Background Art] For example, radio waves are generally used for communication between moving cars, but this means of communication is sometimes subject to regulations under the Radio Law and is subject to problems such as radio interference and interference. One thing is well known.

Additionally, there is a risk that the contents of your communication may be intercepted by others.

There was a problem with confidentiality.

[Purpose of the Invention] The present invention takes the above facts into consideration, and provides an optical communication device between mobile bodies that is not subject to regulations under the Radio Law, solves the problems of radio interference and interference, and has excellent confidentiality. It is.

[Summary of the Invention] In the first invention, communication is performed between moving bodies by a compressed transmission method using optical communication, and an aiming beam irradiated from one moving body to another moving body is used. Then, based on this aiming beam, it is determined whether communication is possible, and when communication is possible, information is exchanged between the moving bodies by optically transmitting the audio signal in a time-base compressed state.

Specifically, each vehicle has a unique identification need (ID code), and this ID code is transmitted and received between the vehicles that are to communicate to determine the other party, and after the ID codes match, one transmits the communication content to the aP5 vehicle. It compresses and transmits data through modulation, allowing information to be exchanged instantaneously.

In addition to the above-mentioned configuration, in the second invention, when communicating with a moving object several in front or several moving objects after, the optical communication device of the intervening moving object is connected to an optical repeater. By using it as a platform, information can be exchanged.

[Embodiment of the Invention] Fig. 1 shows the device of the present invention applied to a case where the device is mounted on a car to enable communication between the cars while they are running.

FIG. 2 shows a case in which the system is applied to a vehicle in which communication is performed between three or more vehicles by using an intermediate vehicle as an optical repeater to enable communication between the front and rear vehicles.

As described above, when communicating between vehicles by optical communication, it is quite difficult to match the optical communication paths between the vehicles while the vehicles are running due to unevenness of the road, vibration of the vehicle, and the like. Therefore, in the present invention, even if there are these disturbances while driving,
In order to enable communication, it is devised to detect instantaneous coincidence of optical communication paths (optical axes) and to compress and transmit the communication content.

An outline of communication in the apparatus of the present invention will be explained with reference to FIG. First, when transmitting audio information from the vehicle CTI to the cptt, a specific predetermined ID code IDR is set in the vehicle CRI on the vehicle CTI side, and this code IDR is set in the vehicle CTI.
is fired toward the vehicle CTI by optical transmission. Vehicle C
On the R1 side, after receiving the code ID, the ID code IDR of the vehicle CRt side is emitted from the CR1 side toward the C-engine on the aiming beam 02.

The vehicle CTI receives this aiming beam 01, and the emitted code IDR matches R from the previously emitted code,
When the light receiving level is high, that is, when the light receiving sensitivity is the best (when the optical axes are aligned), the audio signal is instantaneously transmitted from the vehicle cT1 side as the transmission light beam o2.

This instantaneous transmission is intended to prevent audio signals from being disrupted due to optical axis misalignment between transmitting and receiving light, and from mixing in external noise, thereby obtaining clear audio input. Communication is performed in the same manner when audio information is transmitted from the vehicle CR□ side to the CTI side.

FIG. 3 is a block diagram showing an example of an optical communication device according to the present invention, and an example of the communication operation will be explained in detail with reference to the time charts of FIGS. 4 and 5.

The optical communication device shown in FIG. 3 is an optical communication device mounted on both the vehicles C-engine 1 and CRt, and for convenience of explanation, the same drawings will be used and explained according to the communication state.

First, enter multiple ID codes predetermined for each vehicle into the code input switch 1l-T (here, T is vehicle C).
This means that it is provided in the optical communication device mounted on the T1 side. same as below.

(However, this T is omitted in the drawing), these are converted into 8-bit signals by the encoder 12-T, and then
The data is stored at the specified address in the memory 13-T.

Data is stored using clock signal generator 1 for ID code.
This is done based on the 6-T write clock.

17 is a reference clock oscillator.

Now, when audio is to be transmitted from the vehicle CTI to the CRI, the front/rear changeover switch 7 is switched to the front CF) side at time L1 in FIG. As a result, the front (F) light emission drive circuit 8F-T enters the operating state as described later.

Next, operate the selection switch 10-T to select the memory 13-T.
A code IDR for a specific vehicle, in this example, a vehicle CRI, which is stored by designating the address of , is read out based on the read clock from the clock signal generation circuit 16-T,
It is temporarily stored in temporary memories 15-T and 14-T.

The temporary memory 15-T is used when transmitting the code IDR for the first time, and the other temporary memory 14-T is used for transmitting the code IDR for the first time.
, used when retransmitting.

When the selection switch 10-T is not operated, own vehicle CT
T from the code of Y is read out from the memory 13, and is used to determine if the code matches when receiving the CRI from another vehicle, as will be described later.

At time t2 after the data has been stored in the temporary memories 14-T and 15-T, a display lamp (not shown) for displaying the state in which voice input is possible is turned on for a predetermined period (from t2 to t2 in the figure).
t3) lights up (Fig. 4B) Therefore, after time t2, the sound S input into the microphone 1-T
c (FIG. 4C) is amplified by an amplifier 2-T, and this audio signal is digitally converted by an A/D converter 3-T. A
/D conversion is performed using the sampling clock Sd obtained by the frequency divider 20-T based on the reference clock from the oscillator 17-T (Fig. 4D
) and encoding (8 bits) based on the reference clock of the conversion operation.

In this example, 8 KHz is used as the sampling clock for A/D conversion to 8-bit data. The digital audio signal is generated by a clock generator 18 used during data transmission.
-T is written to the memory 4-T based on the write clock Se (@4 Figure E).

When data writing is completed at time t3, the display lamp goes out and the ID code read enable signal Sf (FIG. 4F) is output from the clock generator 18-T and the oscillator 17-
Based on the reference signal from T, a clock signal from frequency dividing circuit 20-T is supplied to temporary memory 15-T, and the code IDR read from temporary memory 15-T is sent to branching circuit 6-T.
The signal is supplied to the drive circuit 8F-T via T. As a result, the light emitting element 9F- provided on the front side of the vehicle CTL
From T, the data (serial code data) of the modulated code ID is emitted as an optical code toward the rear of the vehicle CR1.

The branch 6-T is for switching between transmitting audio data and code data to the front side or the rear side. On the other hand, the rear light receiving element 3 ( ) RR (R indicates that an optical communication device for the vehicle CR1 is provided) is provided at the rear of the vehicle CRI.

The code IDR is received and converted into an electrical signal (the same applies hereinafter), and this is amplified by the light receiving amplifier 29R-R and supplied to the combiner 28-H, after which the serial/parallel converter 21
-R converts the code ID into parallel data. This serial/parallel conversion is performed based on a synchronization pulse synchronized with the input code IDR, which is output from the synchronization pulse generator 24-R.

The parallel-converted input code IDR is supplied to the coincidence detection circuit 22-R together with the own vehicle code IDR outputted from the memory 13-R, and a coincidence detection of the code data is performed. In this example, both codes match. At this time, H level detection data is obtained.

The output of the combiner 28-R is further sent to a received light level detector 23-
When the input code IDR supplied to R and received is at a predetermined level (receivable level) or higher, H level discrimination data is obtained.

This discrimination data and detection data are the first Antogame)2
6-H and, as described above, the input code IDFI
When the code IDR of the own vehicle CRI matches and is equal to or higher than the receivable level, the output of the first AND gate 26-R becomes H level.

When the output Si of the first AND gate (see Fig. 4H) is obtained at time 1+ (H in Fig. 4), the readout clock is obtained from the frequency divider 20-R based on the reference signal generated by the 1 oscillator 17-R. is supplied to the temporary memory 14-T, and the code IDR for the host vehicle CR1 stored therein is read out and supplied to the turnout 6-H. This splitter 6-H is supplied with a signal from the combiner 28-R indicating that the code IDR has been received on the rear side, so that the code IDE
is selected and transmitted to the rear side, and then the rear light emitting drive circuit 8R-R1 operates and the rear light emitting elements 9R-R1 are excited. This causes the aiming beam 02 to be aligned with the vehicle CT1.
is fired towards.

Since the aiming beam 02 is received by the light receiving element 30F-T provided on the front side of the vehicle Ca1, the aiming beam 02 is
As in the case of &, the other party code IDR included in this aiming beam 02 is supplied to the code coincidence detection circuit 22-T and the received light level detection circuit 23-T, respectively, and the time point when the optical axes of the vehicle CTI and the vehicle CRI coincide. When the first AND output Sg (FIG. 4G) is obtained at t5a, reading of the code IDR from the temporary memory 15-T is stopped based on this.

The first AND output Sg is also supplied to the clock generator 1B-D, so that the read clock Sn of FIG. 5N is supplied from the clock generator 18-T to the memory 4-T.

The number of waves of the read clock Sn is m of the write clock Se.
Therefore, the time axis during reading is compressed to 1/m of the time axis during writing. The compressed parallel audio data is converted into serial data by a parallel/serial conversion circuit 5-T. FIG.
A clock So supplied from T (synchronized with the read clock Sn) is shown, and a period α in the figure shows a group of l block data that has been parallel-to-serial converted.

The compressed audio data is supplied to the branch 6-T, the front light emitting drive circuit 8F-T, and then to the front light emitting element 9F-T, where it is converted into an optical signal, and is emitted to the vehicle CRI side as a light beam ol. Ru.

The emitted period lul+ (transmission period +111) is at time t
It is a very short period from 5a to t8a.

On the CRt side of the other vehicle, the transmitted light beam 01 is sent to the rear light receiving element 3.
The light is received at 0R-R, amplified by the rear light receiving amplifier 29-, and then sent to the serial/parallel converter 31 via the combiner 28-R.
-H, and is converted into cascade audio data in a time axis compressed state. For serial/parallel conversion, synchronous pulse generation circuit 2
Serial/parallel conversion clock Sp obtained by dividing the synchronizing pulse from 4-R by frequency divider 120-H (Fig. 5P)
It is done using.

This parallel audio data is stored in memory 32-H.

The store write clock Sq (Q in the figure) is generated by the clock generator 19-R used when receiving data based on the synchronization pulse from the synchronization pulse generation circuit 24-R.

When data writing is completed at time points t and b, a code transmission end pulse Sj (FIG. 4 J) is generated from the clock generator 19-R.
) is sent to stop reverse code transmission to the vehicle GT.

At the same time, the read clock Sk from the clock generator 19-R is generated using the reference signal generated by the 1 oscillator 17-R.
(K in FIG. 4), the time-axis compressed audio data is read out from the memory 32-R after being time-axis expanded by m times.

This audio data is supplied to the switch 33-R. The switching circuit 33 supplies audio data to the D/A converter 34 or
This is for selecting whether to supply the signal to the parallel/Φ serial converter 5-T, and as will be described later, all signals are supplied to the D/A converter 34 when not used as an optical repeater. That is, the first 7-nd output (corresponding to Si) is at H level, and the second AND gate (to which the detection data inverted by the inverter 25-R and the discrimination data are supplied) 27- When the second AND output obtained from R is at L level, the audio data read out by the memory 32-R is selected and supplied to the D/A converter 34-R, where it is D/A converted.

In addition, during this D/A conversion process, a latch pulse SIC is used to latch and analogize audio data every 8 bits from the frequency divider 20-R based on the reference signal generated by the oscillator 17-R. L) is output.

The analog audio signal Sm (M in FIG. 4) is transmitted from the speaker 36-R via the amplifier 35-R from the time point tea to tv (
The sound is emitted from time t'2 to time t3).

The above communication operation can be summarized as follows.

■ Sending the other party's code IDR to the other party's vehicle CR1.

■ The other party's vehicle CRI determines the IDR, and when it matches the own vehicle code IDR1, sends the own vehicle code IDR1 to the vehicle CT□.

■ Upon receiving the aiming beam 02 at this time, code matching is detected and received light level is detected.

■ When each of the conditions in ■ is met, compressed audio data is transmitted.

- The other party's vehicle CRt stores this compressed audio data in memory and expands the time axis back to its original state.

■ When the received light level is high and the ID codes match again, the time axis expanded audio data is D/A converted and the speaker is driven.

■ Recognizes the contents of the message sent from the other party's vehicle, C-engine. By reversing the operations from ■ to ■, it is possible to communicate from CRI to C-engine.

Note that all control of these communication states is processed based on a control program written in the ROM of the microcomputer 40.

Next, as shown in FIG. 2, a case will be described in which communication between vehicles CF2 and CR2 is performed by using intermediate vehicle Cn2 as an optical repeater.

In this case as well, similarly to the case of voice information exchange between vehicle Ca1 and CRI, the identification code ID predetermined for vehicle CF2 transmitted from vehicle CR2 to Cn2 and vehicle Cn
Detection of coincidence with discrimination code IDr+ of No. 2 is performed, and detection of the light reception level is also performed.

At this time, since the discrimination codes In and IDr+ do not match, when the received light level is high, the first AND gate 2
The first of 6-M (means the AND gate in the exchange device provided in intermediate vehicle Cr+2. The usage example of M is the same below)
The AND output is L level.

The output of the second AND gate 27-M becomes H level.

As a result, the write clock from the clock generator 16-M is supplied to the memory 13-M. At this time, the code IDF is supplied to the serial/parallel converter 37 via the light receiving element 3oR-:M and the combiner 28-M, so that the parallel-converted code ID is stored in the memory 13-M.

Next, based on the read clock from the clock generator 16-M, the code IDF is read from the temporary memory 14-M, 15-M.
The code ID is stored in J! from the temporary memory lJ14-M by the clock from the frequency divider 20-M. Ii is subsequently read out, and the code ID is emitted as a aiming beam from the rear light receiving element 9R-M through the same signal path as described above toward the vehicle CR2.

Then, in the same manner as in the case of FIG. 1, the compressed audio data from the vehicle CR2 is temporarily stored in the memory 32-M, and this compressed audio data is passed through the switching circuit 33-M and the parallel/serial conversion circuit 5-M. By being supplied to the generating element 9F-M, the compressed audio data is optically transmitted to the vehicle CF 2 side.

[Effects of the Invention] Since the present invention is configured as described above, it has the following features compared to the conventional art.

■ Since it is optical communication, it is not subject to regulations under the Radio Law.

■ Compared to radio communication, the communication range is extremely narrow, so communication performance is less likely to deteriorate due to external factors such as radio interference and interference.

■ Since the optical communication path is localized, communication is extremely secure. In particular, if a discrimination code is used, there is no risk that the communication contents will be inadvertently intercepted even if an unrelated vehicle traveling on the same route gets between the communication channels.

(Small) Compressed voice data is transmitted optically only when the optical axes of the communication vehicles match, so even if the communication path is temporarily interrupted due to uneven roads, it does not interfere with communication, and it does not introduce external noise. .

- Since the optical axis is detected based on the optical axis of the other party, communication can be performed when the received light levels of both parties are stable.

■Communication can be carried out even with a moving object several units in front of or several units behind.

[Brief explanation of drawings]

Fig. f51 and Fig. 2 are diagrams showing the state of communication between moving vehicles to which the optical communication device according to the embodiment of the present invention is applied, and Fig. 3 is a block diagram showing an example of the optical communication device between moving bodies according to the present invention. 4 and 5 are timing charts for explaining the operation, respectively. 11. Mike. 4.13-15.32...Memory, 9F, 9RΦ...Light emitting element. 30F, 30R... Light receiving element, 361. Speaker, 22... Code match detection circuit. 23... Reception level detection circuit, No. 16, 18, 19, Φ clock generator, 20... e frequency divider.

Claims (4)

[Claims] (1) In an optical communication device between moving bodies, it receives a aiming beam irradiated from one moving body to another moving body, determines whether communication is possible based on this aiming beam, and when communication is possible, sends an audio signal. 1. An optical communication device between moving bodies, characterized in that information is exchanged between the moving bodies by optically transmitting the information in a time-compressed state. (2) The optical communication device between moving bodies according to claim 1, wherein the compressed audio information is transmitted when the aiming beam is at a communication-enabled level or higher. (3) Optical communication between moving bodies according to claim 1 or 2, wherein predetermined discrimination code information is transmitted to the communicating party's moving body when receiving the aiming beam. Device. (4) In an optical communication device between moving bodies, it receives the aiming beam irradiated from one moving body to the other moving body, determines whether communication is possible based on this aiming beam, and when communication is possible, sends an audio signal. By optically transmitting information in a time-compressed state, information is exchanged between mobile bodies, and the optical communication equipment of the mobile bodies intervening before or after the information exchange is called an optical repeater. An optical communication device between moving bodies, characterized in that it is used as an optical communication device.