JPH033000A - Road information receiver - Google Patents

Abstract

PURPOSE:To automatically receive road information broadcasting, to reduce driver's load and to prevent safety driving from being interrupted by adding a receiver to be exclusively used for receiving road information to a commercial broadcasting receiver, and at the time of receiving road information broadcasting wave, superposing the received wave to a commercial broadcasting demodulating tone and outputting the demodulated tone of the road information broadcasting. CONSTITUTION:A road information broadcasting receiving function 5 is added to a normal radio receiver 1 or another accoustic device, and a vehicle arrives at a zone in which road information broadcasting is executed, the road information broad casting wave is inputted to the exclusive receiver 5 and a demodulation signal AF2 is generated. A signal CD is generated simultaneously with the signal AF2 and inputted to a switching circuit 7, a switch control signal SWS is outputted and the 1st switch 6 is turned on. Since road information is inputted to an amplifier through a hybrid circuit 2, commercial broadcasting and the road information are simultaneously outputted from a speaker. Consequently, the operability of the road information receiv er can be improved, the driver's load can be reduced and the road information can be listened without interrupting the hearing or another accoustic device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a road information receiver, and more particularly, to a road information receiver that can automatically receive radio broadcasts for road information provided on expressways, etc. It is related to the device.

(Prior art) In recent years, on some expressways and general roads,
Many places are now using radio waves to broadcast road information in order to convey road information, such as the level of vehicle congestion, the presence or absence of road construction work, and the occurrence of traffic accidents, to drivers passing nearby.

Such services are useful for preventing drivers from becoming irritated during traffic jams and providing guidance on detours.

Currently, specific frequencies are allocated nationwide for this road information broadcast, and for example, general commercial broadcasting is not carried out.1 Radio waves of 600 KHz or higher are used and can be listened to with a normal AM radio receiver. It is now possible to do so.

However, in the past, in order to receive such road information broadcasting, the driver looked at a display board posted on the road indicating that the service was being provided, and then operated a dial one by one to tune into that frequency. Because the driver was asked to listen to the information at the same time, it was not only extremely troublesome for the driver, but also dangerous, as it could lead to an accident if the driver became distracted by dial operations and became careless about driving.

In addition, as a sound W device, not only AM radio but also CD,
There are cassette tapes and FM stereo equipment, and when listening to the road information broadcast while listening to these, the driver must interrupt the source and switch to AM radio each time, causing frustration to the driver. .

(Object of the Invention) The present invention has been made in view of the problems of conventional road information receivers, and aims to improve operability, reduce the burden on the driver, and further improve the operability even when other audio devices are in operation. It is an object of the present invention to provide a road information receiver capable of listening to road information without interrupting the listening process.

(Summary of the Invention) In order to achieve such an object, the present invention provides an ordinary radio receiver or other audio device with a reception function exclusively for road information broadcasting, so that it can be used in areas where road information broadcasting service is provided. When a broadcast is received, the demodulated sound is automatically output from the speaker.

Furthermore, the road information broadcast demodulated sound is superimposed on other sounds being listened to, and in this case, various modes are provided so that the level can be set lower than the sound of other sources, or when necessary. , 2 Make other sounds smaller and make road information thicker (
Alternatively, the configuration may be such that only road information is output or can be switched.

(Example) The present invention will be described in detail below based on one drawing.

FIG. 1 is a block diagram showing an embodiment of the present invention, and reference numeral 1 is a conventional commercial broadcasting receiver that demodulates radio waves received by an antenna ANT (AFL) and inputs them to an amplifier 3 via a hybrid circuit 2. After amplifying the power, the signal is output as audio from the speaker 4.

Also, numeral 5 is a dedicated road information receiver, with the same antenna A.
Of the radio waves from the NT, only the road information broadcast radio waves are received and demodulated, and the output AF is input to the hybrid circuit 2 via the switch 6.

Further, the road information dedicated receiver 5 outputs a signal CD that is generated only when it receives road information broadcast radio waves, and inputs it to a switching circuit 7, which further triggers a timer circuit 8. Signal TRG is manually operated.

In addition, in this block, the signal SWS from the switching circuit 7 is used to exclusively receive road information (ON-OFF of the switch between the 5 and the hybrid circuit 2 is controlled, and the switching circuit 7 also receives the signal SWS from the timer circuit 8). It is controlled by outputted reset signals RE and SET, and the reset signal is turned ON-OFF by the second switch 9.

These devices are powered by a battery, which is not disclosed.

To explain the operation in this configuration, the i1 wave received by the antenna ANT is supplied to the commercial broadcasting receiver 1 and the road information dedicated receiver 5, and normally only the demodulated signal AF of the commercial broadcasting receiver 1 is a hybrid signal. The demodulated output A from the road information receiver 5 is output to the amplifier 3 via the circuit 2.
F2 does not reach the amplifier 3 because the switch 6 is OFF, and therefore only commercial broadcasting is output from the speaker 4 as audio.

Next, in this state, when you come to a zone where road information broadcasting is being performed, the road information broadcast radio waves are input to the dedicated receiver 5, and at the same time, a demodulated signal AF is generated, indicating that the road information radio waves have been received. A signal C1) indicating this is generated and input to the switching circuit 7. This signal CD is, for example, an automatic gain control signal (AGC) of road information reception ff15.
An electric current Tf, etc., which is a rectified part of a voltage or an intermediate frequency amplified signal, can be used.

In this manner, when a signal indicating that road information broadcasting is being performed is input, the switching circuit 7 outputs the switch control signal SWS and turns on the first switch 6.

Therefore, the road information is input to the amplifier via the hybrid circuit 2, so that the commercial broadcast and the road information are simultaneously output from the speaker.

Furthermore, in this embodiment, the timer circuit 8 is activated by the trigger signal TRG from the switching circuit, and after a predetermined period of time, for example about 30 seconds, the reset signal R is activated.
By generating ESET and returning the switching circuit 7 to its initial state, the switch control signal SWS is eliminated and the switch 6 is turned off.

For this reason, the road information broadcast automatically stops after a certain period of time has passed after starting to receive the road information broadcast, but during this time the driver can judge whether it is necessary to listen to the broadcast and leave it as is if it is not necessary. do it.

Also, if you want to listen to the broadcast again, turn off the reset signal output from the timer circuit to the switching circuit.
When the switch 9 is operated, the reset signal is not transmitted to the switching circuit, and the user can continue listening to the broadcast.

With this configuration, listening to road information broadcasting, which was conventionally complicated, can be performed automatically and does not become an obstacle to safe driving.

The above description is just an example, and the present invention can be modified in various ways.

For example, in the above block diagram, if the switch 9 is operated within the timer period after the start of road information broadcast reception, the road information broadcast will be output continuously, but if you want to stop it midway, the switch 9 The function may be performed by operating the switch 9, or conversely, the road information broadcasting may be stopped by operating the switch 9 within the predetermined time period.

It is also possible to configure the system so that the user can listen to the road information broadcast by operating the switch 9 again.

Note that such complicated control can be achieved relatively easily by installing a simple CPtJ.

FIG. 2 is a block diagram showing an example of a specific configuration of the road information dedicated receiver of the present invention. Radio waves from the antenna ANT are input to a mixer 22 via a high frequency amplifier 21, and mixed with a signal from a local oscillator 23. and the sum or difference thereof is selected by the bandpass filter 24 and sent to the intermediate frequency amplifier 2.
5 is man-powered. Further, a part of the amplified carrier signal from the intermediate frequency amplifier 25 is sent to the carrier detector 30.
The signal is output to the switching circuit 3I after being rectified.

On the other hand, the signal output from the intermediate frequency amplifier 25 is converted into an audio signal by a demodulation circuit 26, inputted to an audio amplifier 28 via a switch 27, amplified, and output from a speaker 29. ing.

The characteristics of this circuit are that the local oscillation x23 has a frequency that receives only road information broadcasting, and that the switching circuit 31 uses the carrier output from the intermediate frequency amplifier 25.
By controlling the switch 27 and turning ON/OFF the road information broadcast, it is possible to automatically listen to the broadcast only when the road information broadcast is being performed.

Therefore, it is possible to attach a receiver configured in this manner to a device other than a radio, such as a cassette tape amphibian device or a CD playback device, and automatically listen to road information broadcasts when they are being broadcast. can.

The basic configuration of the present invention has been explained above.
Various other modifications are possible, and many variations can be considered in the audio output method for road information broadcasting. To explain some of them, when road information broadcasting is received, when outputting it by superimposing it on the audio that is being listened to at the time, the audio level is lowered and heard as a sidetone, and conversely,
One possible method is to make the road information louder.

Alternatively, if the broadcast is set as a sidetone for a certain period of time, and when the broadcast is necessary for the driver, a switch (not shown) can be used to switch to only the sound of the road information rii broadcast, or the sound that was previously being asked is changed to the sidetone and the road information is broadcast. You can also make the sound louder.

(Effects of the Invention) Since the present invention can automatically receive road information broadcasting as described in 1 below, the burden on the driver is reduced and safe driving is not hindered.

Furthermore, even if a road information broadcast is received while listening to a car stereo or radio broadcast, the user can listen to the sound without interrupting the audio, so the user will not lose interest.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the road information dedicated receiver of the present invention. I...Commercial broadcast receiver, 2...Hybrid circuit, 3...Amplifier, 4...Speaker 5...Road information broadcast dedicated receiver, 6...Switch, 7...Switching circuit 8...
・Timer, 9-...Reset switch. 21... High frequency amplifier, 22... Mixer circuit,
23...Local oscillator, 24...Band pass filter, 25...Intermediate frequency amplifier 26...Detection circuit,
27... Switch 28... Amplifier, 29... Speaker, 30... Rectifier, 31... Switching circuit. Figure 1 Figure 2

Claims (2)

[Claims] (1) When a road information reception dedicated receiver is added to a commercial broadcast receiver or other sound reproducing device and road information broadcast radio waves are received, the demodulated sound of the road information broadcast is superimposed on the commercial broadcast reception demodulated sound. A road information receiver characterized by outputting sound. (2) A means for outputting the demodulated sound of the road information broadcasting at a level lower than that of the demodulated sound of commercial broadcasting or the sound from other sound reproduction devices, and means for reversing the magnitude relationship as necessary. The road information receiver according to item (1), characterized in that: