JPH03254235A - Broad area information providing system - Google Patents

Abstract

PURPOSE:To confirm a command of a master station delivered to a slave station with fast transmission speed and simple constitution by sending a reply voice message to a master station corresponding to the content of the command upon the receipt of a DTMF signal. CONSTITUTION:When a DTMF (Dial Tone Multi Frequency) signal being a reproduction command is sent from a radio transmission section 20 of a master station 3, a radio reception section 30 of a slave station 1 receives it and demodulates the DTMF signal, a DTMF signal decoding section 31 decodes the DTMF signal and outputs a reproduction command signal. Then a control section 32 outputs the reproduction message selection signal corresponding to the reproduction command signal and a reply voice output section 35 outputs a reproduction command reply message representing the reception of the reproduction command signal and an FM transmission section 36 broadcasts the reproduction command reply message in an FM. The master station 3 receives the reproduction command reply message to confirm it that the reproduction command signal is delivered to the slave station. Thus, the constitution is simplified and the transmission of the command of the master station delivered to the slave station is confirmed.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention provides a method for arranging a plurality of slave stations within a predetermined area and transmitting voice information recorded by each slave station to a mobile station moving within the predetermined area. The present invention relates to a wide area information providing system in which each slave station changes audio information based on a command signal transmitted wirelessly from a master station.

(Prior Art) Conventionally, wide area information has been provided to moving objects (two automobile trains) using radio waves from broadcasting stations such as NHK and commercial broadcasters. However, since the above broadcasting station is a system that broadcasts information all at once to a wide range of moving objects, it provides road information, land information such as public facilities in the area, and information on shops, etc. that each moving object needs. could not be provided individually.

Therefore, we have developed a system that provides local information to pedestrians using weak FM radio waves, and FM transmitters that emit weak radio waves are installed on utility poles, and the FM transmitters provide local information to moving objects passing nearby. A system has been developed to provide

(Problem to be solved by the invention) However, in the former case, a command is given from a central station (master station) using a wired telephone network (NTT telephone line), and an FM
The message sent by the transmitter (slave station) has been changed. As a result, the configurations of the central station and the slave stations become complicated, and the devices thereof become larger and more expensive.

In the latter case, the ground station (master station) is connected by wire or wirelessly.
The transmitter sends commands to the slave stations using digital signals to change the transmitted messages recorded in the slave stations. As described above, since commands are transmitted using digital signals, the transmission speed that is possible with current technology (for example, 9600 Bps) is extremely slow, and there is a problem that the transmission takes time. Ta. Furthermore, there was a problem in that it was not known whether commands from the master station were being transmitted to the slave stations.

(Object of the Invention) The present invention was made in view of the above problems, and its purpose is to increase the transmission speed, and
To provide a wide area information providing system in which the configuration of a master station and a slave station is simple and it is possible to confirm that commands from the master station are transmitted to the slave stations.

(Means for Solving the Problems) In order to achieve the above object, the present invention arranges a plurality of slave stations within a predetermined area, and transmits audio information recorded by each slave station within the predetermined area. In addition to transmitting to a moving object,
A wide area information providing system in which each slave station changes audio information based on a command signal transmitted wirelessly from a master station, wherein the command signal transmitted from the master station to the slave stations is a DTMF signal, The station is characterized in that when it receives the DTMF signal, it transmits a response voice message corresponding to the command content of the DTMF signal to the master station.

(Function) Since the present invention is the above-mentioned system, the command signal transmitted from the master station is a DTMF signal, and the slave station sends a response voice message to the master station corresponding to the command contents of the received DTMF signal. Send to.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a conceptual diagram showing the configuration of a wide area information providing system according to the present invention, and in FIG. 1, D is a road A.
, B are the utility poles installed, and L is the transmitting device that is a pole station (slave station) installed on a specific utility pole. It is installed in

Each transmitting device radiates recorded audio information into the air on radio waves, and these radio waves are FM waves that can be transmitted to cars (
The frequency is selected to be one that can be received by an FM radio receiver that is normally mounted on the moving object 2 or an FM radio receiver carried by a pedestrian (moving object) (not shown).

Further, in FIG. 1, 3 is a master station (ground station) that controls the slave station 1.

FIG. 2 is a block diagram showing the configuration of the master station 3 and slave station 1. The master station 3 has a keyboard (input unit) U for inputting recording commands, playback commands, monitor commands, clock setting commands, etc. , DTMF according to each command inputted by the keyboard 11
(Dial Tone Multi Frequency
Microphone 14 and tape recorder 15 that output DTMF signal generation signal and output 12-voice information as well as output H level gate signal for a certain period of time.
an audio output section 13 consisting of gate terminals G, ~G3;
Analog switch 17.1 that becomes conductive when becomes H level
8.19, 12TM on DTMF signal generation
a gate section that receives and outputs the DTMF signal when the F signal is output, and receives and outputs the audio signal output from the audio output section 13 only when the DTMF signal is not output from the DTMF signal generation section 12; 16, and a wireless transmitter 20 that transmits audio information and DTMF signals output from the gate section 16.

The transmission frequency of this wireless transmitter 2o is different from that of the FM transmitter 36, which will be described later.

In the analog switch 19 of the gate section 16, when the analog switch 18 is conductive, the gate terminal G3 becomes L level and becomes non-conductive, and when the analog switch 18 is non-conductive, the gate terminal G3 becomes H level and becomes conductive. It's supposed to be.

The slave station 1 includes a wireless receiving section 30 that receives transmissions from the master station 3.
Then, the radio receiving unit 30 decodes the command of the DTMF signal and converts it into a BCD (Binary Coded Deci
Based on the BCD signal, which is the command signal output after performing DTMF signal resolution signal decoding in 31, which outputs each command signal as a ma+) signal, an H-level gate signal, a recording/playback signal, A control unit 32 that outputs a response message selection signal, a response message sending signal, etc.
an analog switch 33 which receives the gate signal and becomes conductive and outputs the audio information received by the wireless receiving section 30; and an analog switch 33 which receives the recording/playback signal and records the audio information output from the analog switch 33. a recording and reproducing section 34 that outputs a response voice message corresponding to the response message selection signal; and a response voice output section 35 that outputs a response voice message corresponding to the response message selection signal; It also includes an FM transmitting section 36 that transmits the response voice message outputted from the voice output section 35 via FM.

The control unit 32 includes a memory (not shown) for storing the time at which the audio information recorded in the recording/playback unit 34 is transmitted, and a timer (not shown) for measuring the time,
When the timer reaches the set time stored in the memory, a reproduction signal is output. Further, the control unit 32 is also capable of changing the set time stored in the memory according to a command from the master station 3.

The control unit 32 also controls the 31D signal for DTMF signal decoding so as not to accept the input signal for 31 hours after outputting the 31D signal for DTMF signal decoding.
1. This is to prevent malfunction due to audio information output from the radio receiving section 30 after receiving the 31MF signal during DTMF signal decoding.

Next, the operation of the wide area information providing system of the above embodiment will be explained.

If there is no command from the master station 3, the control section 32 outputs a reproduction signal at a preset time, so at that time, the control section 32 outputs a reproduction signal,
The recording and reproducing section 34 starts reproduction, the recorded voice message is output, and the FM transmitting section 36 broadcasts the voice message on FM. As a result, each vehicle 2 and pedestrian (not shown) can receive the voice message using the FM receiver they carry or carry, and can obtain various information.

Next, the slave station 1 records according to the command from the master station 3! Playback section 34
The case where new audio information is recorded or changed will be explained.

First, a recording command signal is input by operating the keyboard 11 of the master station 3. Then, the DTMF signal generator 12
A gate signal of H level is output for a certain period of time from
An MF signal is output. The analog switch 1748 is made conductive by the gate signal, and the DTMF signal output from the DTMF signal generator 12 is input to the wireless transmitter through the analog switch F.

On the other hand, the analog switch 18 is made conductive by the gate signal, and the gate terminal G3 of the analog switch 19 connected to the analog switch 18 becomes L level. The analog switch 19 is activated by the L level of this gate terminal G3.
becomes non-conductive, and the audio information from the audio output unit 13 is not input to the wireless transmitter 2o.

The DTMF signal input to the wireless transmitter 20 is modulated and transmitted.

The radio receiving unit 30 of the slave station 1 receives the modulated wave and converts it into DTMF
Demodulates and outputs the signal. DTMF signal decoding In order to decode the DTMF signal, the command of the DTMF signal is decoded and the decoded command signal is output. That is, the DTMF signal decoder outputs one command signal. Then, the control section 32 outputs a recording signal together with a gate signal based on this recording command signal, the analog switch 33 becomes conductive due to the gate signal, and the recording/reproducing section 34 becomes in a recordable state according to the recording signal.

Further, when the control unit 32 receives the recording command signal, it outputs a recording response message selection signal corresponding to the command, and outputs a recording command response message indicating that the recording command signal has been received from the response voice output unit 35. The message is transmitted by the FM transmitter 36.

On the other hand, the master station 3 stops outputting the DTMF signal output from the DTMF signal generating section 12 and stops outputting the gate signal. Then, analog switch 17.1
8 becomes non-conductive. Due to the non-conducting state of the analog switch 18, the gate terminal G3 becomes H level, and thereby the analog switch 19 becomes conductive. Then, after receiving a recording command response message transmitted from the slave station 1 by an FM receiver (not shown) and confirming the response message, the voice output section 13 outputs voice information. This audio information is input to the wireless transmitter 20 through the analog switch 19, and the audio information is modulated and transmitted from the wireless transmitter 20.

In this way, when the DTMF signal is output,
Audio information is no longer output from the gate section 16,
When the DTMP signal is not output, the audio information is output from the gate section 16, so there is no need to provide a changeover switch and select the DTMF signal or audio information each time by switching the switch, resulting in improved operability. Become something.

The audio information modulated wave transmitted from the master station 3 is received by the wireless receiving section 30 of the slave station 1 and demodulated into audio information. The demodulated audio information is input to the recording/reproducing section 34 through the analog switch circuit 33, and the audio information is recorded in the recording/reproducing section 34 or the audio information is changed.

When the recording and reproducing section 34 finishes recording, a recording end signal is transmitted from the recording and reproducing section 34 to the control section 32, and the control section 32 outputs a recording end message selection signal indicating the end of recording. Then, the response audio output unit 35 outputs a recording end response message, and the FM transmitter 36 broadcasts the recording end response message on FM. The master station 3 can know the end of recording by receiving a recording end response message through an FM receiver (not shown).

By the way, DT representing various commands sent from the master station 3
Since the MF signal is an analog signal and the audio information transmitted from the master station 3 is also an analog signal, the transmission speed from the master station 3 to the slave station 1 is fast. In addition, since telephone lines etc. are not used to transmit various commands,
The configurations of the master station 3 and the slave station 1 are simple.

Next, a case in which a DTMF signal for a reproduction command is output from the master station 3 will be briefly described.

When the wireless transmitter 20 of the master station 3 transmits a DTMF signal for reproduction command, the wireless receiver 30 of the slave station 1 receives the DTMF signal and transmits the DTMF signal.
Demodulates the M and F signals and converts the DTMF signal into a 1D
It decodes the TMP signal and outputs a reproduction command signal. Then, the control unit 32 outputs a reproduction message selection signal corresponding to the reproduction command signal, the response audio output unit 35 outputs a reproduction command response message indicating that it has received the reproduction command signal, and the FM transmitter 36 outputs a reproduction command response message indicating that it has received the reproduction command signal. The reproduction command response message is broadcast on FM. By receiving the reproduction command response message, the master station 3 can confirm that the reproduction command signal has been transmitted to the slave station.

After outputting the reproduction message selection signal, the control section 32 outputs a reproduction signal to operate the recording and reproduction section 34. The recording/playback unit 34 plays back the recorded audio information, and the played audio information is sent to the FM transmitter 36.
The information is transmitted to vehicles 2 and pedestrians moving within a predetermined area, and can receive the information using their on-board or portable FM receivers.

In this way, when the slave station 1 receives a command from the master station 3, the slave station 1 sends a response message corresponding to the command, so the master station 3 checks the response message and sends the next message. Commands can be input from the keyboard 11, which allows the slave station 1 to operate reliably, and there is no need to provide a special transmission protocol.

(Effects of the Invention) According to the present invention, since the control signal signal transmitted from the master station to the slave station and the audio information recorded in the slave station are analog signals, the transmission speed from the master station to the slave station is fast. In addition, since it does not use telephone lines, the configuration of the master station and slave stations is simple, and it is very convenient because it allows you to confirm that commands from the master station are being transmitted to the slave stations. becomes.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing a wide area information providing system according to the present invention, and FIG. 2 is a block diagram showing the configuration of a master station and a slave station. 2...Car (mobile object) 3...Ground station (master station) 12...DTMF signal generation section 13...Audio output section 16...Gate section 20...Wireless transmission section

Claims (2)

[Claims] (1) Multiple slave stations are placed within a predetermined area, and the voice information recorded by each slave station is transmitted to mobile objects moving within the predetermined area, and each slave station transmits wirelessly from the master station. This is a wide-area information providing system that changes audio information based on the command signal sent from the master station to the slave station, in which the command signal sent from the master station to the slave station is a DTMF signal, and the slave station transmits the DTMF signal when it receives the DTMF signal. A wide area information providing system characterized by transmitting a response voice message corresponding to the command contents of a DTMF signal to a master station. (2) The master station has an input section for inputting each command, a DTMF output section for outputting a DTMF signal corresponding to the command input to this input section, and outputs audio information to be recorded by each slave station. an audio output unit that stops outputting audio information from the audio output unit when a DTMF signal is output from the DTMF output unit;
A gate unit that outputs audio information from the audio output unit when a DTMF signal is not output, and a wireless transmission unit that transmits the DTMF signal and audio information output from the gate unit to the slave station. The wide area information providing system according to claim 1, characterized in that: