JPS59128698A - Traffic information transmitting/receiving system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traffic information transmission/reception method for receiving traffic information while a moving object such as a car is traveling on a motorway such as an expressway or other roads. .

In such a traffic information transmission/reception system, the carrier wave frequency at which the traffic information is transmitted is known in advance before the traffic information passes through the area where the traffic information is transmitted by radio waves, and therefore the same frequency is known. Coordination must be carried out. Otherwise, it is not possible to receive traffic information while driving on a road. It is an object of the present invention to provide a traffic information transmission/reception system that can actually receive traffic information.

FIG. 1 is a plan view of one embodiment of the present invention. A motorway such as an expressway has an up line 1 and a down line 2 provided in parallel. Corresponding to the up line 1 and down line 2, there is a semi-@ head area 4゜5 such as a toll gate where a car 8 as a moving object pays a fee when entering the up line 1 and down line 2. are provided respectively. Traffic information receiving areas 6 and 7 are provided in the up lane 1 and the down lane 2, respectively. In these traffic information receiving areas 6.7, the transmitting device 9 transmits traffic information such as the situation of traffic congestion that is useful for a car 8 traveling in the direction of the arrow 8 in the up lane 1.
It cannot be transmitted as a radio wave by antenna Ill. Similarly, on the down line 2, traffic information useful for cars traveling on the down line 2 is transmitted by radio waves from a transmitting device 11 in the traffic information reception area 7 via an antenna 12.

The carrier wave frequency transmitted in this traffic information receiving area 6.7 is different from the carrier wave frequency used for general radio broadcasting, and is different from the carrier wave frequency used for general radio broadcasting. The value of the carrier frequency near the upper or lower receivable limit is selected. The carrier frequencies in the traffic information receiving area 6.7 are set to different values fc1 . . . to prevent mutual interference. fc2
are determined respectively.

FIG. 2 is a perspective view of the preparation area 4. This preparation area 4 is covered by a shield member 5 made of an electrically conductive material, such as iron, which is grounded.

This preparation area 4 is an area through which a car 8 entering the up line 1 passes, and is located upstream of the traffic (information receiving area 6). The electric field strength of the broadcast is weak or zero.A loop antenna 14 is embedded in the preparation area 40 and the road 1a.
ing. A carrier wave frequency that is the same as the frequency of existing radio broadcasting is transmitted from the transmitting circuit 15 to the loop antenna 14. This carrier frequency is modulated by an audio signal that is transmitted in the traffic information receiving area 6 and notifies the carrier frequency fcl. This audio signal is
For example, when fcl is 1,600 Hz,
It may be a voice that says, "Traffic information can be sung at a frequency of 1,600 kHz."

When there are a plurality of radio broadcasting stations, the transmitting device 15 modulates each frequency of the radio broadcasting and each carrier wave frequency of N1 with an audio signal and transmits the modulated signals. Therefore, if a radio broadcast is received by the receiving device 16 such as a conventional car radio installed in the automobile 8 and reaches the semi-@ area 4, the radio broadcast will no longer be heard. Instead of this radio broadcast, you can listen to the 00th audio. Therefore, the driver of car 8
The tuning frequency of the receiving device @16 is changed so that it can receive the carrier wave frequency fcl instructed by the voice, and the vehicle travels along the up line I in the direction of arrow 8. As a result, the carrier wave frequency fc1 can be received in the traffic information receiving area 6, so that traffic information can be heard.

According to another concept of the invention, in the preparation area 4 a carrier frequency signal having a frequency fcl modulated by an audio frequency signal may be transmitted from the antenna 14 by means of a transmitting device M15. When the tuning frequency of the receiving device 16 is tuned to the carrier frequency fC1 in the quasi@@@ region 4 by kneading, an audible frequency signal can be heard. Therefore, the receiving device 16 can be reliably tuned to the carrier frequency fcl Vc, and the traffic information can be reliably heard in the traffic information receiving area [6]. This audio frequency signal may be, for example, a "beep" sound, but in the same way as yoh0,
In relation to the downlink @'2, the preparation area 5 is also configured so that the radio field strength of the radio broadcast is weak or zero, and the transmitting device 18 is used to transmit signals upstream from the traffic information receiving area 7 of the downlink link 2. The same frequency as the radio broadcast from the antenna 19 embedded in the road lb! A transmission frequency signal is transmitted. The carrier wave frequency in this preparation @ area 5 is not modulated by the audio signal that is sent out in the traffic information receiving area 7 and notifying the intercarrier wave number fc2. Instead of this audio signal, for example, an audible frequency signal called "bee" may be used.

A further embodiment of the present invention will be described with reference to FIG. In the predetermined traffic information receiving areas 6, 7 of the up line 1 and the down line 2, traffic information is transmitted to the transmitting devices 9, 11 and the antenna 10 using carrier frequencies fclJc2 that are different for each up line 1 and down line 2. .12. In the preparation area 4 located upstream of the traffic information receiving area 6 of the L line I, the same carrier frequency fC1 as the carrier wave frequency fC1 being transmitted at the traffic information receiving head [6 corresponding to the up line I is audible. It is modulated with a wave number signal and transmitted by the transmitting device 15 and antenna 14. In addition, in the same manner, in the HI-broadband area 5 upstream of the traffic information receiving area 7 of the down line 2, the carrier wave frequency fc2 is the same as that transmitted in the traffic information receiving area 7 corresponding to the down line 2. The carrier frequency is modulated with an audio frequency signal and transmitted by a transmitting device 18 and an antenna 19. The audio frequency signal may be a monotonous sound, such as a "beep", or it may be a sound containing meaningful information.

The driver of the automobile 3, who has proceeded on the road W, la to the L line l, changes the tuning frequency of the receiving device 16 in the preparation area 4 and receives the carrier wave frequency @ f c 1 . This allows us to hear audible frequencies. After completing this tuning operation, if you are traveling on the up line 1, you can listen to traffic information when you enter the traffic information reception @ area 6. A similar operation is performed regarding the down line 2. The carrier frequencies @ f c 1 , f c 2 are chosen to be different frequencies from those of the radio broadcast, and therefore the preparation area 4.5 is not configured to be shielded so that the electric field of the radio broadcast is weak or zero. Good too.

A further embodiment of the present invention will be described with reference to FIG. Predetermined traffic information receiving area 6 for up line 1 and down line 2
．． In 7, the interchange ii1 information is transmitted by radio waves to the L line 1 and the down line 2 using mutually different carrier frequencies fcl and fc2. Traffic information receiving area 6 of this up line 1
In the preparation area 4 on the upstream side of
is transmitted using the transmitter 15 and antenna 14. The intercarrier wave number fc2 in this quasi@ region 4 is modulated by a signal having a frequency fH, which may be an audio frequency. As for the down line 2, in the preparation @ area 5 on the upstream side of the traffic information receiving area 7, the down line 2
The remaining carrier wave frequency fc different from the carrier wave frequency fC2 that cannot be transmitted in the traffic information receiving area 7 corresponding to
l is modulated by a signal having a frequency fH and transmitted using a transmitting device 18 and an antenna 19. The automobiles 8 traveling on these up lines 1 and down lines 2 are equipped with receiving devices 20 for receiving traffic information. The automobile 8 may be equipped with a receiving device @16, such as a car radio, for receiving conventional radio broadcasts.

FIG. 8 shows a specific configuration of the receiving device 20. As shown in FIG.

In this receiving device 20, the signal received from the antenna 21 is not provided to the tuner 22. The tuner 22 is supplied with a signal from a line 26 via a switch 26 for changing the line 2B, 24 to 17I. When common contact 27 of transfer switch 25 conducts to individual contact 28 and voltage from voltage source 28 is applied to tuner 22, tuner 22 is tuned to receive carrier frequency fcl. Also, the common contact 2 of the changeover switch 25
7 is electrically connected to another individual contact 29 and the voltage from the voltage source 24 is applied to the tuner 22, the tuning frequency of the tuner 22 becomes the carrier frequency frequency fc2.

Such tuners include, for example, variable voltage dependent variable capacitance diodes and are well known in the art as so-called electronically tuned tuners. The output received and demodulated by the tuner 22 is sent from the line 3o to the amplifier circuit 31.
The signal is converted into sound without being applied to the speaker a2 via the speaker a2. Also, the demodulated output from line BO is filtered by bandpass filter B8.
I can't give it to you. The bandpass filter 8B has a frequency fH
Only signals having a p-wave are generated. This signal is applied to the detection plane F@B4 which performs the S* wave or rectification. The detection circuit 84 receives the same wave number f via the bandpass filter 8B.
When a signal having a high level H is input, a high level signal is applied to line B5, thereby causing the flip-flop 86 to
Reverse the zero stable state. The flip-flop 85 is a so-called toggle flip 70, and responds to a rising waveform from a low level to a high level via the line 85, and changes the level of the line B7 to high or high every time the rising waveform is received. Alternately change to low and hold. The changeover switch 2!5 conducts the common contact 27 to the individual contact 28 when the line 87 is at a high level, and conducts the common contact 27 to the individual contact 29 when the line 87 is at a low level.

The tuning frequency of the tuner 22 of the receiving device 1i120 is fc
Assume that l. At this time, the output id of the flip 70 knob 86 is at a high level, and the contacts 27 and 28 are conductive. The automatic vehicle 11B equipped with such a receiving device 20 reaches the quasi@ area 4.

In this preparation type v, 4, the radio waves of frequency fc2 are still being emitted. Therefore, line 80 includes tuner 22.
No signal is derived from. When the vehicle reaches the traffic information receiving area while traveling on the up line 1 in this state, the carrier wave frequency fC1 is received, and the traffic information can be audible and heard from the speaker 82 via the amplifier circuit 81.

Assume that the tuning wave number of the tuner 22 is fc2. At this time, the 7-lip 70 tube 86 is outputting a low level signal to the line 87, and the P and 1iIi contacts 27 of the changeover switch 25 are electrically connected to the individual contacts 29.

When the motor vehicle 8 enters the preparation area 4, a signal having a frequency fH is derived from the tuner 22 on the line 80. Due to kneading, the output from the detection circuit 34 changes from a low level to a high level on a line 85. Therefore, flip 70 knob 86 produces a high level signal on line 86 in a steady state 1ift. Therefore, the changeover switch 25
The common contact 27 is electrically connected to the individual contacts 28 . In this way, when the voltage from the voltage source 2B is applied to the tuner 22,
The reception frequency of the tuner 22 is the carrier frequency fclV
C becomes. Therefore, when the vehicle is subsequently traveling in the traffic information receiving area 6 of the up line 1, the traffic information can be heard through the speaker B2. This kind of operation is the downlink Ia2
The same applies in relation to.

Preparations v:, 4, and 5 do not need to have KWt so that the strong electric field of radio broadcasting is weak or zero, and the carrier wave frequency fclJc2 is selected to a value different from the frequency of radio broadcasting.

Not only in connection with upstream 491 and downstream 2;
The present invention can be broadly implemented in connection with other roads.

As described above, according to the present invention, when a vehicle enters a traffic information receiving area while driving on a road, traffic information changes depending on whether or not it actually receives traffic information.

[Brief explanation of the drawing]

FIG. 1 is a simplified plan view for explaining one embodiment of the present invention, FIG. 2 is a perspective view of the preparation area 4, and FIG. 8 is a block diagram showing the specific configuration of the receiving device 1120. . l...up line, 2...down line, B...car, 4
．． 5... Preparation area, 6.7... Traffic information receiving area,
9,11.15.18... Transmitting device, 10,12,1
4゜19.21...Antenna, 16.20...Reception WI Daisanto Patent attorney Kei Nishi

Claims (1)

[Claims] In a predetermined traffic information reception area of the 111 road, traffic information is transmitted using a carrier frequency different from the frequency of radio broadcasting, and the traffic information is transmitted upstream of the traffic information reception area of the road A preparation area where the electric field strength of the radio broadcast is weak or zero is provided on the side, and in this preparation area, an audio signal is provided to notify the carrier frequency that the same carrier frequency as the frequency of the radio broadcast cannot be transmitted in the traffic information receiving area. A traffic information transmission/reception system characterized by being modulated by signals and transmitted. (2) In predetermined traffic information reception areas of multiple roads, traffic information is transmitted using different carrier frequencies for each road, and preparation is made upstream of each traffic information reception area of each road. A traffic information transmission/reception system characterized in that in the @ area, an audio frequency signal is modulated with an intercarrier wave number that is the same as the carrier frequency transmitted in the traffic information receiving area corresponding to the road. (3) In the predetermined traffic information reception area of multiple roads, traffic information is sent using a different carrier frequency for each road, and preparation is made on the upstream side of each traffic information reception area of each road. The area transmits a residual inter-carrier wave number that is different from the same carrier wave number that is transmitted in the traffic information receiving area corresponding to that road, and the receiving side receives this residual carrier wave frequency to identify the number of carrier waves that pass while driving. A traffic information transmission/reception method characterized by changing a tuning frequency to a carrier wave frequency transmitted in a traffic information receiving area.