JPS61195031A - Communication equipment between vehicles - Google Patents

Abstract

PURPOSE:To execute efficiently optical communications between vehicles by approaching a vehicle to be transmitted to a communications equipment at a line side and transmitting information, which is subjected to the time compression and stored, to said vehicle to be received from the communication equipment at the line side through a line side communications equipment and a control center. CONSTITUTION:When sound information is transmitted to the vehicle CR from the vehicle CT, said information is provisionally stored which is transmitted to the memory circuit of the optical transmitting and receiving equipment TR of the vehicle CT. Then, when the vehicle CT passes in the vicinity of the line side communications equipment S1, a sound signal from the equipment S1 compresses and transmits a vehicle identifying code IDR and a sound signal to an equipment 1 by means of optical space transfer. The signal received by the equipment S1 is transmitted to the control center CC through an optical fiber cable CB and provisionally stored. Here, when the vehicle CR passes in the vicinity of the line side communications equipment S2, the optical transmitting and receiving equipment TR, which receives the sound signal from the equipment S2, compresses and transmits the IDR code by means of the optical space transfer. Receiving the IDR code, the equipment S2 transmits the information to the center CC through the cable CB. Then the information is collated with the code of the vehicle CT in the center, and information on the vehicle CT is transmitted to the vehicle CT.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inter-vehicle communication device using optical communication, which enables voice communication between vehicles.

Conventionally, radio waves have generally been used for communication between moving vehicles. However, it is well known that communication means using radio waves may be subject to regulations under the Radio Law and may have problems such as radio wave interference and interference. Additionally, there is a risk that the contents of the communication may be intercepted by others, and there is a problem with confidentiality. However, if a vehicle not equipped with an optical communication device is present between the vehicles to be optically communicated, optical communication cannot be performed.

[Problem that the invention seeks to solve]

The present invention is not subject to regulations under the Radio Law, solves the problems of radio interference and interference, and has excellent confidentiality, even when there are vehicles that are not equipped with an optical communication device between the vehicles that need to communicate. The object of the present invention is to obtain an inter-vehicle communication device capable of transmitting audio signals.

Means for Solving Problem c] The vehicle-to-vehicle communication device according to the present invention includes a vehicle-side optical transmitter that is installed in the vehicle and temporarily stores an audio signal, compresses the time axis, and transmits the optical signal; A vehicle-side optical receiver optically receives a time-axis compressed audio signal, temporarily stores it, expands the time axis, and reproduces the original audio signal, and a vehicle-side optical transmitter installed on the roadside within a predetermined area. A plurality of roadside communication devices that receive signals and transmit optical signals to vehicle-side optical receivers within a predetermined area, and a vehicle to which each roadside communication device is connected and which should transmit the signals received by the roadside communication devices are the roadside communication devices. and a control center that sends a message to the roadside communication device when the vehicle approaches.

[Effect]

The passenger's voice signal is temporarily stored in the vehicle-side optical transmitter. When a vehicle passes near a roadside communication device, the audio signal is compressed in time by an activation signal or the like from the roadside communication device, and is optically transmitted to the roadside communication device.Then, the signal is sent to a control center. The signal is temporarily stored by the roadside communication device or control center. When the vehicle to be transmitted approaches the roadside communication device, the temporarily stored signal is optically transmitted from the roadside communication device to the vehicle side optical receiver while being compressed in time axis. The vehicle-side optical receiver temporarily stores the signal, expands the time axis, and reproduces the original audio signal. Note that the vehicle to be transmitted is distinguished using a vehicle ID code (vehicle identification code).

〔Example〕

Embodiments of the inter-vehicle communication device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, a roadside optical communication device S+ (i=1.2, . . . ) is disposed on the corner side of a road R. Each roadside optical communication device S1 has an optical fiber cable CB
It is connected to the control center CC via. Instead of using the optical fiber cable CB, a coaxial cable for millimeter wave transmission or the like may be used.On the other hand, the vehicle CT, C1
1, there are optical transmitting/receiving bags fiT, each having the same configuration.
, T is provided.

To summarize the communication method between vehicles, from vehicle C1 to vehicle CI
When audio information is to be transmitted, the audio information to be transmitted is temporarily stored in the storage circuit of the optical transceiver TT of the vehicle C7. Next, when the vehicle CT passes near the roadside optical communication device S1, a tone signal from the roadside optical communication device S1 (the optical transmitting/receiving device T of the vehicle C7) is transmitted.

transmission activation signal), the vehicle identification code IDI
code (a code predetermined for vehicle C11,
The index R is used to distinguish between different codes for each vehicle. ) and an audio signal (temporarily stored audio information signal) are compressed and transmitted to the roadside optical communication device S1 by optical space propagation. The signal received by the roadside optical communication device S is transmitted to the control center CC via the optical fiber cable CB and temporarily stored. Next, when the vehicle C5 on the receiving side passes near the roadside optical communication device St, the tone signal from the roadside optical communication device S2 (optical transceiver device T of the vehicle C, l
The optical transmitter/receiver TI that received the transmission start signal of
The DR code (a code predetermined for the host vehicle C, l) is compressed and transmitted through optical space propagation. Roadside optical communication equipment S
2 receives this signal and transmits the signal to the control center CC via the optical fiber cable CB. This ■D shit code is compared with the ID and l code from other vehicles temporarily stored in the control center CC. If this ID code matches the IDI code transmitted from the vehicle C11, an audio signal is immediately transmitted together with this IDI code to the roadside optical communication device S2, and then the vehicle C11
It is compressed and transmitted by optical space propagation. The optical transceiver bag WTII of the vehicle Cm receives this, expands the time axis, and reproduces and outputs the original audio.

In addition, in order to make effective use of the lines, each roadside optical communication bag r
IISi is also equipped with a storage device to temporarily store the audio signals sent from the vehicle CT, and ID! It is also possible to transmit only the l code to the control center CC and temporarily store it in the control center CC. In this case, the ID codes transmitted from vehicles C3 and C1 are compared, and when they match, the control center CC sends the audio signal temporarily stored in the roadside optical communication device S along with the ID code to the roadside optical communication device S. The command signal is transmitted to the roadside optical communication device S, which transmits it to the communication device S2, and then the audio signal is reproduced in the vehicle C1 in the same manner as described above.

Transmission of audio information from vehicle C11 to vehicle C1 is also performed in the same manner as the above method.

Next, a method of collecting and transmitting traffic information will be explained. Traffic information from each driver is attached with an IDC code, which is an identification code of the control center CC, and is transmitted from the vehicle's optical transmitter/receiver to the roadside optical communication device S, and collected at the control center CC. The control center CC processes the collected traffic information and transmits it to the optical transceiver of each vehicle via each roadside optical communication device WSr as traffic information adapted to each road. This allows each driver to obtain traffic information tailored to the situation in real time.

Next, the details of each device will be explained in accordance with FIG. 2 with reference to the transmission/reception time charts of FIGS. 3 to 5.

FIG. 2 shows a vehicle communication device T (however,
32.33 inside the dotted line is excluded). One roadside optical communication device S
The configuration in which the control center and the control center are combined has a configuration in which 32 and 33 in the dotted line are added to this vehicle communication device T. Therefore, for convenience of explanation, when the layer shown in FIG. Layer N-
It is expressed as C and distinguished. In addition, in the description of this embodiment, for convenience, when the roadside optical communication device S is referred to, the control center CC is also included.

When the ID code (a code predetermined for each vehicle) of the vehicle (multiple vehicles) with which information is to be exchanged is inputted from the ID code input switch 9-T, it is encoded into a digital signal by the encoder 10-T and output automatically. A plurality of ID codes together with the vehicle ID code are generated by ■D code R/W signal generation circuit 17.
The write signal from -T is stored in each address of the storage circuit (for ID code) 12-T. When transmitting audio information from vehicle 0 to vehicle C3, at time t, (third
Specify the address of the memory circuit 12-T by selectively operating the ID code selection switch 11-T (Japanese),
The stored D8 code of the vehicle CR is output by a read signal from the R/W signal generation circuit (for ID code) 17-T, and is temporarily written into the temporary storage circuit 13-T.

When the ID code selection switch 11-T is not selected, the ID code of the host vehicle is output from the storage circuit 12-T. Next, at time Lt (FIG. 3A), a voice input (memory) possible display lamp (not shown) lights up, and from this time t2, voice (FIG. 3B) is input from the microphone 1-T.
A clock signal (e.g., sampling frequency 8KH2) for sampling the audio analog signal from the frequency dividing circuit 14-T, which is amplified by the amplifier 2-T and divides the frequency of the reference signal from the oscillator 16-T (Fig. 3). C) and the conversion signal for encoding (8 bits), the A/D conversion circuit 3-T converts the audio analog signal into a digital signal, and after the encoding is completed,
The data is written into the storage circuit 4-T by a write signal (FIG. 3D) from the audio signal transmission R/W signal generation circuit 15-T based on the reference signal from the oscillator 16-T. When the writing to the memory circuit 4-T is completed at time Ls (FIG. 3A), the voice input (storage) possible indicator lamp goes out.

At time t4 (FIG. 3E), when the vehicle sensor 32-C (for example, a vehicle speed detector using the Doppler effect) of the roadside light communication device (including the control center) Sl senses the presence of the vehicle C1, the The sensing signal is the tone number 13 generator 3
3-C, the tone signal is transmitted from the splitter 6-C to the light emission drive circuit 7-C, is amplified by the driver 7-C, and is converted into B10 (electrical signal/optical signal) by the generating element 8-C. , is emitted toward vehicle C7. Vehicle 0 receives this optical signal with the light receiving element 24-T, performs O/E conversion, amplifies it with the light receiving amplifier 25-T, and sends it to the tone signal detection circuit 21-T.
When a tone signal is detected at T, the tone signal detection signal (E in FIG. 3) is sent to the temporary storage circuit 13-T and R for audio signal transmission.
/W signal generation circuit 15-T. Next, the II) R code is sent from the temporary storage circuit 13-T to the branching circuit 6-T by the clock signal generated by the frequency dividing circuit 14-T.
transmitted to. Then R:/W (f
Memory read signal from signal generation circuit X5-T (Figure 4L)
is input to the memory circuit 4-T, and the audio signal temporarily stored in the memory circuit 4-T is read out. In addition, the frequency dividing circuit 14
-T, the clock signal synchronized with the readout signal to the storage circuit 4-T (M in FIG. 4) is used to perform parallel-to-serial conversion in the P/S conversion circuit 5-T, and is transmitted to the branch 6-T. Ru. ID code and subsequent audio signal SS (Fig. 3F
) are both amplified by the light emitting drive circuit 7-T, and the light emitting element 8
-T, the light is converted to E10 and emitted toward the roadside optical communication device S for a period of time from time t4 to 1h.

Here, the speed at which the audio signal SS is written to the memory diagram Ia4-T is . , if the reading speed is ■8, then ■1/Vw=M
>>l, and the transmission time is l/M= (t,
The time axis is compressed by a factor of t, )/(t2 Lx).

■D, the optical signal of the code and the audio signal SS (Fig. 3 F) that follows it is O/E converted by the light receiving element 24-C, amplified by the light receiving amplifier 25-C, and the ID member that is first transmitted. The code is serial-parallel converted by the S/P conversion circuit 23-C, and the ID
The write signal from the code R/W signal generation circuit 17-C is stored in the storage circuit (for ID code) 12-C. The subsequently transmitted audio signal is processed by the S/P conversion circuit 26-C into a clock signal (( In FIG. 4 N), serial-to-parallel conversion is performed. Also,
The storage circuit 27 is generated by the write signal (FIG. 5 0) generated by the audio signal receiving R/W signal generation circuit 18-C which outputs a signal based on the reference signal generated by the synchronization signal generation circuit 22-C. -C until time t6. At this time, ■D stored in the memory circuit (for ID code) 12-C,
The code and the audio signal stored in the storage circuit 27-C are stored with corresponding addresses, respectively.

Time 1. (FIG. 3G), when the vehicle sensor 32-C of the roadside optical communication device fsx detects the presence of the vehicle C1l, the tone signal generator 32
-C generates a tone signal (Fig. 3G), and the splitter 6
- Light emission drive circuit from C? -C, is amplified, is converted to E10 by light emitting element 8-C, and is emitted toward vehicle C1 from time t to too (FIG. 3G). Vehicle C11 receives this optical signal at time 1. (Fig. 3H), the light is received by the light receiving element 24-R, O/E converted, and the light receiving amplifier 25-
Amplify with R. Next, when the tone signal detection circuit 21-R detects a tone signal, the tone signal detection signal (Fig. 3H
) is the temporary storage circuit 13-R and the audio signal transmission R/W.
The signal is transmitted to the signal generation circuit 15-R. This time, memory circuit 4
Since the audio signal is not stored in -R, the temporary storage circuit 13-'R then sends a predetermined I
Only the D* code (FIG. 3H) is transmitted to the branch 6-T.

This IDi code is amplified by a light emitting drive circuit 7-R, converted into a light emitting element 8-R"rE10, and is sent to the roadside optical communication device St.
The light is emitted for a period of time from time t to time t. When the roadside optical communication bag WS2 receives the optical signal of this ID
5-C amplified. Next, the S/P conversion circuit 20-C
The data is converted into serial and parallel data, input to the ID code/number calculation circuit 19-C, and compared with the ID code stored in the storage circuit (for ID codes) 12-C. Memory circuit (ID
code) 12-C is the I
A D code is stored, and from time the to t,
ID code/number configuration circuit 19-C to temporary storage circuit (I
(for D code) 13-C1 Audio signal receiving R/W signal generation circuit 1B''C1 A D code coincidence signal (FIG. 3G) is transmitted to the frequency dividing circuit 14-C and the switch 28-C, respectively. ID8 initially temporarily stored in the temporary storage circuit 13-C
The code is read from time t to tit by the clock signal (FIG. 3G) generated by the frequency dividing circuit 14-C, and is transmitted to the branching circuit 6-C. Next, a memory readout signal (FIG. 5P) is input from the audio signal receiving R/W signal generation circuit 18-C to the storage circuit 27-C, the temporarily stored audio signal is read out, and the switching circuit 28-C By P/
It is transmitted to the S conversion circuit 5-C. In addition, the frequency dividing circuit 14-
A clock signal (Q in FIG. 5) synchronized with the read signal from C to the storage circuit 27-C is used to perform parallel-to-serial conversion in the P/S conversion circuit 5-C, and is transmitted to the branching circuit 6-T.

The ID, code, and the audio signal that follows (Fig. 3G) are both amplified by the light emitting drive circuit 7-C, and the light emitting element 8-C outputs E.
10, and the light is emitted toward the vehicle C11 for a period of time from tll to tll. From the roadside optical communication device S to the vehicle Cm
The optical signal of the ID foot code and the audio signal that follows is transmitted to the light receiving element 24-R, and is O/E converted by the light receiving element 24-R and amplified by the light receiving amplifier 25-R.
The ID11 code transmitted up to 1 (H in Figure 4) is S.
/P conversion circuit 20-C performs serial-to-parallel conversion, and the ID code -
The output circuit 19-R manually outputs the ID code, compares it with the ID code of the own vehicle CI, and outputs the ID code-signal to the R/W signal generation circuit 18-R1 for audio signal reception, the frequency divider circuit 14-R, and the switching circuit. 28-R respectively. Then time t
The audio signal is transmitted from lt to t to ko (Figure 3H)
) is divided by the frequency dividing circuit 14-R by the S/P conversion circuit 26-R.
The serial-to-parallel conversion is performed using the clock signal (R in FIG. 6) generated by . In addition, an R/W signal generation circuit 1B for audio signal reception
-R is written into the memory circuit 27-R by a write signal (S in FIG. 5) generated at the terminal -R.

Time t1. When the writing is finished, press R for audio signal reception.
/W The read signal generated by the signal generation circuit 18-R (
3), the audio signal stored in the memory circuit 27-R is read out, and the switching circuit 28-R reads the D/
The 8-bit parallel output signal is temporarily stored and converted from a digital signal to an analog signal by the latch signal (FIG. 3J) transmitted to the A conversion circuit 29-R and generated by the frequency divider circuit 14-R. It is amplified by the amplifier 30-R and output as audio from the speaker 31-R from time t13 to t14 (Fig. 3K).

Here, if the speed of writing the audio signal into the storage circuit 27-R is V,1, and the reading speed is 1, then ■@/V* =
l/M>>1, and the playback time is 1/M-(t
+a-) / (!+s t+□) times the time axis.

Next, regarding the method of collecting and transmitting traffic information, traffic information from each driver is transmitted in the form of an audio signal with an IDc code added from the optical transmitter/receiver of the vehicle Ct to the control center CC via the roadside optical communication device S1. The control center CC processes the collected traffic information and transmits it as traffic information adapted to each road from each roadside optical communication device to the optical transmitter/receiver of each vehicle in the form of an audio signal with an ID and code added. This is performed in the same manner as in the case of audio transmission from the vehicle CT to the vehicle C11.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following unique effects compared to the prior 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 area where optical communication is possible is limited, communication is extremely secure. In particular, if a vehicle identification code is used, there is no risk of the communication contents being inadvertently intercepted by an unrelated vehicle.

(2) Since communication is performed between vehicles via the roadside communication device and the control center, communication can be performed even if a vehicle not equipped with an optical communication device is interposed between the vehicles to be communicated.

■ The control center receives traffic information from each vehicle via the roadside optical communication device and can process this information, making it possible to transmit traffic information in real time that is more suited to the situation. Traffic control can be carried out.

[Brief explanation of drawings]

Fig. 1 is an overall schematic diagram showing an embodiment of the inter-vehicle communication device according to the present invention, and Fig. 2 is a vehicle-side optical transmitter/receiver (the configuration in which one roadside optical communication device and a control center are combined is also the same). The block diagram and FIGS. 3 to 5 are time charts of transmission and reception. S, (i=1 to 6)...Roadside communication device, CB...Optical fiber cable, CC...Control center, C0, CR...Vehicle, T7, TR...Optical transmitter/receiver, l ...Microphone, 4.12.13.27... Temporary storage device, 8... Light emitting element, 24... Light receiving element.

Claims (1)

[Claims] A vehicle-side optical transmitter installed in the vehicle temporarily stores audio signals, compresses the time axis, and optically transmits the signals; and an optical transmitter installed in the vehicle optically receives the audio signals compressed in the time axis, temporarily stores them, and expands the time axis. A vehicle-side optical receiver that reproduces the original audio signal and a vehicle-side optical transmitter installed on the roadside within a predetermined area receive optical signals from the vehicle-side optical receiver and transmit the optical signals to the vehicle-side optical receiver located within a predetermined area. The present invention is characterized by comprising a plurality of roadside communication devices and a control center to which each roadside communication device is connected and transmits signals received by the roadside communication devices to the roadside communication device when a vehicle to which the roadside communication devices are to transmit approaches the roadside communication device. Vehicle-to-vehicle communication device.