JPH061918B2 - Radio broadcasting equipment for roads - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road radio broadcasting apparatus, and more particularly, to a broadcasting apparatus for broadcasting a radio along a road using a cable that leaks radio waves. Is.

[Prior Art] In road traffic, the driver is required to be able to drive comfortably and safely. For that reason, it is necessary to appropriately inform the driver of road information such as road congestion and accidents. Is required.

As a road information system that meets such demands, a method of displaying information on an electronic bulletin board or the like and visually appealing is generally adopted, but considering the accuracy and abundance of information, a method based on a bulletin board is used. Is more effective with a radio broadcast method, and some roads are currently broadcasting only road information.

However, this is local, it is desirable to broadcast the road information over the entire route, and it is more useful if a dedicated music program etc. that makes the driver relax and entertain can be played at the same time as the road information. It will be

In order to allow the driver to receive a dedicated radio broadcast over the entire road, it is conceivable to install omnidirectional antennas such as monopoles at several points on the road. Due to the non-directionality, broadcast waves reach a wide area outside the road, and effective use of radio waves cannot be achieved, and electric fields from both antennas are combined near the midpoint between two adjacent antennas. However, it is not practical because there is the inconvenience that good listening cannot be performed due to the decrease in level due to the phase difference and the occurrence of beat due to a slight difference in frequency.

Further, as a transmission method, it is the simplest to simultaneously transmit a dedicated radio program and road information by using separate carrier frequencies, but there is a drawback that the frequency cannot be effectively used.

For this reason, a method of broadcasting a dedicated radio program and road information using a single carrier frequency at time intervals is conceivable, but some drivers are forced to hear unnecessary road information. Not preferable.

Therefore, a cable that leaks radio waves is used to broadcast a dedicated radio program using a single carrier frequency, and road information is forcibly sent instead of the radio program when an accident occurs. A radio broadcasting device for use is considered and is locally realized in a tunnel or the like.

An example of this is shown in FIG. That is, for each unit section H ₁ , H ₂ ... H _n along the road, a cable 5 of a predetermined length that leaks a radio wave, and a single voice signal connected to this cable 5 is converted into one radio wave ( A monaural transmitter 4 capable of transmitting as a medium wave), a monaural program compiling machine 1 for generating a monaural audio signal forming a dedicated monaural radio program, and a road information compiling machine 2 for generating an audio signal for transmitting road information. ,
A changeover switch 3 for switching the monaural transmitter 4 to either one side of the monaural program compiling machine 1 and the road information compiling machine 2 is provided. Such a unit is provided corresponding to each of the unit sections H ₁ , H _2, ... H _n , and the broadcasting device A ₁
~ _An .

Then, normally, the changeover switch 3 connected to the monaural transmitter 4 is switched to the monaural program organizer 1 side as shown in the figure to broadcast a monaural radio program. Is switched to the side of the road information organization machine 2 to forcefully flow the road information.

According to such a conventional road radio broadcasting apparatus, since a cable that leaks radio waves is used, the radio waves can be effectively used, and a plurality of broadcasting apparatuses A _{1 to An} are connected to the section H _1.
~ H _n are provided corresponding to each of them, so that good listening can be performed in any section.

In addition, since a single carrier frequency is used, effective use of frequency can be achieved, and road information can be forcibly sent only when an accident occurs, not on a regular basis. Will not be forced to hear unnecessary road information.

[Problems to be Solved by the Invention] However, in the above-described conventional road radio broadcasting device, since road information is sent to all sections where cables are laid only when an accident occurs, it is not local but high speed. When it covers all routes such as roads, drivers are often forced to hear unnecessary road information, and
On the other hand, there is the inconvenience that the road information cannot be heard when the driver thinks it is necessary.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, and to simultaneously transmit a dedicated radio program and information such as road information by using a single carrier frequency. To provide a radio broadcasting device for roads that can hear information such as road information when information such as road information is needed and can listen to a dedicated radio program when information such as road information is unnecessary is there.

[Means for Solving the Problems] In order to achieve the above object, a road radio broadcasting apparatus according to the present invention is a road radio that performs radio broadcasting along a road using a cable that leaks radio waves. In a broadcasting device, a plurality of transmitters that are provided for each unit section along a road, are connected to cables of a predetermined length that leak radio waves, and can transmit two independent audio signals as one radio wave. A first signal generating source for generating a two-channel audio signal constituting a radio program, a second signal generating source for generating an audio signal for transmitting information such as road information, and the unit signal section. , A first state in which a 2-channel audio signal obtained from the first signal source is supplied to the transmitter in each unit section as a 2-channel audio signal, and the first signal source A signal obtained by combining the obtained two-channel audio signals and the audio signal obtained from the second signal source is supplied as two kinds of audio signals to any one of the second states, or to the first state. It is characterized by comprising a plurality of changeover switches for changing over to either of the second state and the third state of supplying only the audio signal obtained from the second signal generating source.

[Operation] In the road radio broadcast apparatus according to the present invention configured as described above, by switching the changeover switch in the necessary unit section to the second state, the left and right sides of the driver's vehicle in the unit section are changed. A dedicated radio program and information such as road information can be heard at the same time from a 2-channel speaker such as a speaker, and the driver can select and listen to only the desired channel by adjusting the balance volume of the car radio.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

In FIG. 1 showing the first embodiment, the entire route of the road is divided into a plurality of unit sections as indicated by unit sections H ₁ and H _{2 to} H _n , and a predetermined radio wave is leaked to each unit section. A cable 15 having a length and a stereo transmitter 14 which is an output terminal connected to the cable 15 and is capable of transmitting two independent audio signals as one radio wave, specifically, a medium frequency wave having a specific frequency. A two-channel audio signal forming a radio program at the two output terminals O ₁ and O ₂ , a stereo program compiling machine 11 as a first signal source for generating a stereo audio signal in this case, and road information. Information such as
In this case, a second audio signal that conveys road information is generated.
Is provided with a changeover switch 13 as a signal source of the signal, and the changeover switch 13 is provided at one output end O ₁ of the stereo program formation machine 11 and an output end of the road formation machine 12. Either one of them is a stereo transmitter 14
It is to be connected to one input terminal I ₁ of the other output terminal O ₂ of the stereo programming unit 11 is directly connected to the other input terminal I ₂ stereo transmitter 14.

Such are provided as a broadcast apparatus _{B 1, B} 2 ~B _n corresponding to each of the unit sections _{H 1, H} 2 _{~H n.}

Then, when it is necessary to inform the driver of the road information, for example, in the unit section H ₁ , the changeover switch 1
3 is switched to the output output side of the road information compiling machine 12, and in the other unit sections H _{2 to} H _n , the changeover switch 13 is set to one output end O _{1 of the} stereo program compiling machine 11.
Switch to the side. However, the stereo program organizer 11
When the changeover switch 13 is switched to the output end side of the road information knitting machine 12, the other output end O ₂
In addition, a monaural audio signal obtained by combining left and right stereo audio signals is obtained.

Therefore, the driver can usually drive while listening to the dedicated stereo radio program from the left and right speakers of the car, and when the driver enters the unit section H ₂ that is the road information broadcasting section, the driver can use the left and right speakers exclusively. Since you can hear the monaural radio program and road information at the same time, you can select and listen only to the desired one by adjusting the balance volume of the car radio. When selecting a radio program and listening from one of the speakers, the radio program is monaural and can be heard with good sound quality.

In FIG. 2 showing the second embodiment, the unit sections H _{1 to} H ₁
Broadcasting devices C ₁ to C corresponding to _n-1 and H _n , respectively.
_{n-1, C n} is provided.

Each of the broadcasting devices C _{1 to} C _n-1 and C _n is provided with two changeover switches 23a and 23b, and one changeover switch 23a corresponds to the changeover switch 13 in the first embodiment shown in FIG. Similarly, one of the output end O ₁ of the stereo program compiling machine 21 and the output end of the road information compiling machine 22 is connected to _one input end I ₁ of the stereo transmitter 24, and the other changeover switch is connected. 23b connects one of the other output end O ₂ of the stereo program compiling machine 21 and the output end of the road information compiling machine 22 to the other input end I ₂ of the stereo transmitter 24.

In the unit section where it is necessary to inform the driver of road information at normal times, one of the changeover switches 23
a is switched to the output end side of the road information compiling machine 22 and the other changeover switch 23b is switched to the other output end O ₂ side of the stereo program compiling machine 21. The changeover switch 23a is switched to _one output end O ₁ side of the stereo program compiling machine 21, and the other changeover switch 23b is switched to the other output end O ₂ side of the stereo program compiling machine 21.
When serious disasters such as earthquake or fire occurs in all the unit sections H ₁ to H _n, the selector switch 23a, as shown, switch 23b together in the road information knitting machine 22 side. However, the stereo program compiling machine 21 is configured such that, when one of the changeover switches 23a is switched to the output end side of the road information compiling machine 22, a monaural sound signal obtained by synthesizing left and right stereo sound signals at the other output end O _2. Is obtained.

Therefore, in this example, normally, it is the same as the first example shown in FIG. 1, but when a serious disaster such as an earthquake or a fire occurs, information is forcibly provided to the drivers on all routes of the road. It can be washed away and is extremely beneficial in the sense of preventing an increase in disasters.

The road radio broadcast apparatus according to the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, a plurality of broadcasting devices consisting of a stereo program compiling machine, a road information compiling machine, and a changeover switch should not be installed in correspondence with each unit section along the road, and the stereo program is arranged in the control center as shown in FIG. knitting machine 31, the road information excursion machine 32, the changeover switch 33a, the main unit is installed consisting of 33b, unit interval _H 1 along the road by the relay _cable, H 2 to H broadcasting system D correspond to the respective _{n 1} , D _{2 to} D _n may be provided. And
It can be connected to the stereo transmitters 35 installed in each of the unit sections H ₁ , H _{2 to} H _n .

By doing so, the redundancy of the entire system can be reduced.

Further, the content of the radio program is not limited to stereo and may be any of two channels, and the information is not limited to road information and may be news or road guidance.

Depending on the content of the program or information, the signal generators such as the program organizer and the information organizer can be shared for all the unit sections or some of the plurality of unit sections.

[Effects of the Invention] As described above, according to the present invention, it is possible to simultaneously broadcast a dedicated radio program and information such as road information by using a single carrier frequency. When you need information such as road information, you can listen to information such as road information, and when you do not need information such as road information, you can listen to a dedicated radio program. Further, it is possible to broadcast information such as road information limited to a part of the section, or to broadcast only road information to all sections simultaneously when there is a conventional method.

[Brief description of drawings]

1 is a circuit block diagram of a road radio broadcasting apparatus showing a first embodiment of the present invention, and FIG. 2 is a circuit block diagram of a road radio broadcasting apparatus showing a second embodiment of the present invention. FIG. 4 is a circuit block diagram showing a modified example of the second embodiment, and FIG. 4 is a circuit block diagram showing an example of a conventional road radio broadcasting apparatus. 11 ... Stereo program organizer (first signal source) 12 ... Road information organizer (second signal source) 13 ... Changeover switch 14 ... Stereo transmitter 15 ... Cable

Claims (1)

[Claims] 1. A road radio broadcasting device for performing radio broadcasting along a road using a cable for leaking radio waves, the radio broadcasting device for roads being provided for each unit section along the road, each having a predetermined length for leaking radio waves. 2 independent, connected to the cable
Multiple transmitters that can transmit various types of audio signals as one radio wave, a first signal source that generates two-channel audio signals that make up a radio program, and an audio signal that conveys information such as road information And a second signal generating source which is provided for each unit section, and the two-channel audio signal obtained from the first signal source is supplied to the transmitter in each unit section as a two-channel audio signal. A first state of supply and 2 obtained from the first signal source
The signal obtained by combining the channel audio signals and the audio signal obtained from the second signal generation source is supplied to one of the second states, or the first state.
And a plurality of changeover switches for changing over to any one of the above state, the second state, and the third state for supplying only the audio signal obtained from the second signal generation source. Radio broadcasting equipment.